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Back To Craftsman Air Compressor       Model: 919.176840 or 919176840 Craftsman Oil Lubricated Single Stage Air compressor
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S _ AIRS GENERAL MANUAL FOR CRAFTSMAN OIL LUBRICATED SINGLE STAGE AIR COMPRESSORS NOTE : For identificationof Repair Parts , see separate Parts List Manual . Record in the spaces provided . ( 1 ) The model number which can be found on the maintenance label on the left front of the air tank . ( 2 ) The code number which can be found on the foil label on the rear of the air tank . ( 3 ) The Manufacturers Number ( ASME code compressors only ) is located on the metal data plate which isir welded onto the backside ofthe a tank . ( This data plate Is paintedthe same color as the tank . ) Retain these numbers for future reference . SAFETY GUIDELINES Model No . ASSEMBLY OPERATION Code No . IMPORTANT : MAINTENANCE Read the Safety Guidelines Mfg . No . TROUBLESHOOTING and All Instructions REPAIR PARTS Carefully Before Operating Sears , Roebuck and Co . , Chicago , IL 60684 U . S . A . i MG - OILLUBE 8 / 22 / 90 i
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TABLE OF CONTENTS Page Page WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Grounding Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SAFETY GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Additional Regulators and Controls . . . . . . . . . . . . 11 Break - in Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 WARNING CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 OPERATING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . 12 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Daily Start - Up Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 ACCESSORIES FOR USE WITH SEARS AIR COMPRESSORS . . . . . . . . . . . . . . . . . . . 6 SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Air Filter - Inspection and Replacement . . . . . . 15 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Oil - Checking and Changing . . . . . . . . . . . . . . . . . . . . . . 15 Check Valve - Inspection and Replacement 15 ON - RECEIPT INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Safety Valve - Inspection and Replacement 15 Belt Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 DESCRIPTION OF OPERATION . . . . . . . . . . . . . . . . . . . 7 Belt Guard - Removal and Installation . . . . . . . . 16 Pressure Switch - Replacement . . . . . . . . . . . . . . . . . . 16 ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Motor Overload Protector - Reset . . . . . . . . . . . . . . 17 Items Needed for Assembly . . . . . . . . . . . . . . . . . . . . . . 8 Motor Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Installing Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Motor - Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Installing Rubber Foot Strip and Wheels . . . . 9 Air Compressor Pump - Replacement . . . . . . . . 17 Installing Tank Pressure Gauge . . . . . . . . . . . . . . . . 9 Pulley and Flywheel - Alignment . . . . . . . . . . . . . . . . 18 Installing Regulator Manifold / Regulator Assembly - ( for outfits supplied with regulators ) . . . . . . . . . . . . 9 Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Installing Shut - Off Valve Separate Regulator or Shut - Off Valve - ( outfits without regulators ) . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Servicing Intake and Exhaust Valves . . . . . . . . . . 18 INSTALLATION AND BREAK - IN PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Location of Air Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Voltage and Circuit Protection . . . . . . . . . . . . . . . . . . . . . . 10 TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . 20 Extension Cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Lubrication and Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 HOW TO ORDER REPAIR PARTS . . . . . . . . . . . . . . . . . 24 FULL ONE YEAR WARRANTY ON AIR COMPRESSORS If this air compressor fails dueto a defect in material or workmanship within one yearfrom the date of purchase , RETURN IT TO THE NEAREST SEARS SERVICE CENTER / DEPARTMENT THROUGHOUT THE UNITED STATES AND SEARS WILL REPAIR IT , FREE OF CHARGE . Ifthis aircompressoris used for commercial or rental purposes , the warranty will apply for ninetydays from the date of purchase . This warranty gives you specific legal rights and you may have other rights which vary from state to state . Sears , Roebuck and Co . , Sears Tower , Dept . 731CR - W , Chicago , IL 60684 2
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Thismanualcontainsinformatiotnhatisimportanftoryouto knowandunderstandT . thisinformationrelatestoion , protectinYgOURSAFETYandPREVENTINEGQUIPMENPTROBLEMST . ohelpyourecognizethisinforma weusethefollowingsymbols . Pleasereadthemanuaal ndpayattentiontothesesections . URGENT SAFETY INFORMATION - A IMPORTANT SAFETY INFORMATION HAZARD THAT WILL CAUSE SERIOUS - A HAZARD THAT MIGHT CAUSE INJURY OR LOSS OF LIFE , SERIOUS INJURY OR LOSS OF LIFE . NOTE Information for preventing damage to equip - Information you should pay special attention to . ment . i . . . . . . . . . . . . . . . . HAZARDS CAN OCCUR IF EQUIPMENT IS NOT USED PROPERLY . PLEASE READ THE FOLLOWING CHART , WHAT TO WHAT COULD HAPPEN HOW TO PREVENT IT LOOK FOR Hot Parts The compressorhead anddischarge tube ( s ) get hot Nevertouch the aircompressorhead ortubesduring when the air compressor is running . If you touch or immediatleyafter operation . them , youcan be seriouslyburned . Flammable It is normal for the motorandpressure switch to spark Alwaysoperatethe air compressorin wellventilated Vapors when the compressor starts or stops . A spark can areas ; free of gasolineor solventvapors . ignite flammable vapors from gasoline or solvents causing a fire or explosion . Do not operatethe compressornear the sprayarea . If spraying a flammable material , provide ample ven - tilation . Never spray in a closed area . There must be a flow of fresh air at all times . Unsuitable The solvents 1,1,1 - Trichloroethane and Methylene If the material you intend to spray contains the sol - Solvents Chloride can chemically reactwith aluminum used in vents listed at left ( read the label or data sheet ) , do not paint spray guns , paint pumps , etc . , and cause an use accessories that contain aluminum or galvanized explosion . These solvents can also react with galva - parts . You must either change the material you intend nized components and causecorrosion andweaken - to spray , or use only stainless steel spray equipment . ing of parts . This does not affect your air compressor , but it may affect the equipment being used . Compressed Compressed air can propel dust , dirt or loose par - Never point any nozzle orsprayertoward a person or Air ticles it comes in contact with . These propelled par - any part of the body . ticles may cause serious injury or damage . Always wear safety goggles or glasses when usingthe air compressor . Always turn the air compressor off before attaching or removing accessories . Toomuch air pressure appliedto airtoolsoraccesso - Check the manufacturer's pressure rating for airtools riescan cause damageor riskof bursting . and accessories . The input pressure to a tool or accessory must never exceed the manufacturer's rating . A pressure regulator must be installedbefore using accessories rated less than 125 PSI . Continued . . . 3
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SAFETY GUIDELINES I WHAT TO HOW TO PREVENTIT WHAT COULD HAPPEN LOOK FOR Electricity Your air compressor is powered by electricity . Like Wiring of the pressure switch , motor and ON / OFF any other electrically powered device , if it is not used switch should be done by a licensed electrician in properly it may cause electrical shock . accordancewithnationaland local codes . Always unplug the air compressor prior to mainte - nance or repair . Never use the air compressoroutdoors when it is raining . Always plug the cord intoan electrical outletwiththe specified voltage and adequate fuse protection . MovingParts This compressorcyclesautomatically when the pres - Never operate the compressorwith the belt guard removed . sureswitchisinthe ON / AUTO position . Ifyouattempt repairormaintenancewhilethecompressorisoperat - ing , or withthe switchinthe ON / AUTO position , you Always unplugthe unit and release air pressure from can expose yourself to moving parts . These moving the tank and any accessories before doing repair or parts can cause serious injury or damage ifthey come maintenance . into contact with you or your clothing . Toxic Vapors it is normalfor compressedair tocontaintoxicor irri - Never directly inhalethe compressedair produced by this unit . tating vapors . Such vapors are harmful if inhaled . Certain materials you are spraying ( like paint , weed Read labels and safety data for all materials you killer , sand or insecticide ) can be harmful if you inhale spray . Follow all safety precautions . them . Usea mask or respiratorif there is achance of inhaling toxic sprayed materials . Masks and respirators have limits and will only provide protection against asomed kinds and limited amounts of toxic material . Re mask and respirator instructions carefully . Consult with asafety expert or industrial hygienist ifyou arenot sure about the use of a certain mask or respirator . Air Tank Modifications to the air compressor in an attempt to Do not adjust , remove or tamperwiththe safetyvalve reach higher air pressure can cause the air tank to or pressure switch . If safety valve or pressure switch rupture or explode . replacement is necessary , a part with the same pres - sure rating must be used . For servicereplacementuseonlythe motors , pulleys and belts designed as standard service replacement parts as indicated in parts list . Use of improper parts could cause overloading of your unit and electrical supply . Do not substitutea gas engine for the motor . . . the compressor was not designed to be powered by a gasoline engine . Never replacethe compressorpump with a different model . Never increasethe compressorpump speed . Changing the airtank will cause ittoweaken . The tank Neverdrillinto , weldorinanyway modifythe airtank . can rupture or explode . Do notrepaira leakingtank ; it mustbe replaced .
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I SPECIFICATIONS I Refer to Outfit Parts Bulletin for the specifications of If any of the above conditions cannot be you rcompressor . Use only afuse or circuit breaker that met , or if operation of the compressor re - isthe same rating as the branch ci rcu itthe air compres - peatedly causes interruption of the power , sor is operated on . If the compressor is connected to a it may be necessary to operate it from a 20 circuit protected by fuses , use dual element time delay amp circuit . fuses , as noted in that service bulletin . Some models have a dual voltage motor , 120 and 240 volt . They are wired for 120 volt but can be converted to 240 volt operation . Instructions for connecting these motors for operation at 240 volt can be found printed on Refer to Outfit Parts Bulletin for your com - the inside of the motor covers or on the nameplate of pressor . Certain air compressor models these motors . can be operated on a 15 amp circuit if : 1 . Voltage supply to circuit is normal . 2 . Circuit is not used to supply any other Certain air compressor models can be con - electrical needs ( lights , appliances , etc . ) verted to 240 volts from 120 volt operation . 3 . Extension cords comply with specifica - tions in this manual . When converting a specific model to 240 volt operation , the attached three - prong 120 4 . Circuit is equipped with 15 amp circuit volt plug must be replaced with the three - breaker or 15 amp dual element time de - prong 240 volt plug ( purchase locally ) or lay fuse . Use a Fusetron Type " T " time order line cord Part No . SUDL - 404 - 1 . delay fuse . I CFM : Cubic feet per minute . Cut - In Pressure : While the motor is off , air tank pressu redrops as you continue to use your accessory . SCFM : Standard cubic feet per minute ; a unit of When the tank pressure drops to a certain low levelthe measure of air delivery . motor will restart automatically . The low pressure at which the motor automatically re - starts is called " cut - in PSIG : Pounds per square inch gauge ; a unit of pressure . " measure of pressure . Cut - Out Pressure : When you turn on your air com - ASME : American Society of Mechanical Engineers ; pressor and it begins to run , air pressure inthe air tank made , tested , inspected and registered to meet the begins to build . It builds to a certain high pressure standards of the ASME . before the motor automatically shuts off - protecting your air tank from pressure higher than its capacity . U . L . Listed : Underwriter Laboratories ; Samples of The highpressure atwhich the motor shutsoff iscalled compressor outfits , taken from production , were sub - " cut - out pressure . " mitted to U . L . and found to comply with their require - ments for design and performance .
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Thefollowingaccessorieasreavailablethroughthecurrentgenerasl alecatalogorat full - lineSearsstores . • SPRAY GUNS • AIR TANKS • AIR HOSE : • BLOW GUNS • INFLATOR KITS 1 / 4 " , 5 / 16 " or 3 / 8 " I . D . • AIR CAULKING GUNS • QUICK CONNECTOR SETS in various lengths • AIR POWERED WASHER GUNS ( various sizes ) . NAILER / STAPLERS " SANDBLASTERS . VlSCOSIMETER Decking Finishing • AIR BRUSHES • AIR PRESSURE REGULATORS Farming Carpenting • AIR LINE FILTERS • OIL FOG LUBRICATORS Roofing Upholstery • TIRE AIR CHUCKS • AIR TOOLS : Siding Picture Framing • PAINT TANKS Sanders • DRAIN CLEANER Drills • DUSTER GUN Impact Wrenches Hammers i GENERAL INFORMATION _ n _ iine _ u _ r _ catoris usu You have purchased an air compressor unit consisting prolong tool life . of a 2 cylinder , single - stage air compressor pump , an air tank , air hose , wheels , handle , associated controls Separate air transformers which combine the functions and instruments . You may also find an air chuck . of air regulation and / or moisture and dirt removal should be used where applicable . Your air compressor can be used for operating paint spray guns , air tools , caulking guns , grease guns , air These accessories can be purchased from most Sears brushes , sandblasters , inflating tires and plastic toys , stores or from the Sears General or Power Tool spraying weed killers , insecticides , etc . An air pressure Catalog . regulator is recommended for most of these applica - tions . An air line filter is usually required for removal of moisture and oil vapor in compressed air when a paint spray gun is used . i ON - RECE PTINSPECT ON I Each air compressor outfit is carefully checked before Immediately upon arrival , check equipment for both shipment . With improper handling , damage may result concealed and visible damages to avoid expenses in transit and cause problems in compressor opera - being incurred to correct such problems . This should tion , a bent crankshaft , etc . be done regardless of any visible signs of damage to the shipping container . Report any damages to carrier and arrange for inspection of goods immediately .
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DESCR PT ONOFOPERAT O ! N L , i Drain Valve : At the base of the air tank to drain con - Shut - off Valve : Turn the knob counterclockwise to densation at the end of each use . open the valve and clockwise to close . Motor Thermal Overload Protector : The electric Safety Valve : If the pressure switch does not shut off motor has an automatic thermal overload protector . If the air compressor at its cut - out pressure setting , the the motor overheats for any reason , the thermal over - safety valve will protect against high pressure by load protector will shut off the motor . The motor must " popping out " at itsfactory set pressure ( slightlyhigher be allowed to cool down before restarting . than the pressure switch cut - out setting ) . ON / AUTO - OFF Switch : Turn this switch ON to Regulator : The air pressure coming from the air tank provide automatic power to the pressure switch and is controlled by the regulator knob . Turn the knob OFF to remove power . clockwise to increase pressure and counter - clockwise to decrease pressure . To avoid minor readjustment Air Intake Filter : This filter is designed to clean air after making a change in pressure setting , always coming intothe pump . This filter must always be clean approach the desired pressure from a lower pressure . and ventilation openings free from obstructions . See When reducing from a higher to a lower setting , first " Maintenance " . reduce to some pressure less than that desired , then bring up to the desired pressure . Depending onthe air Air Compressor Pump : To compress air , the piston requirements of each particular accessory , the outlet moves up and down in the cylinder . On the down - regulated air pressure may have to be adjusted while stroke , air is drawn inthrough the air intake valves . The operating the accessory . exhaust valve remains closed . On the upstroke of the piston , air is compressed . The intake valves close and compressed air is forced out through the exhaust Outlet Pressure Gauge : The outlet pressure gauge valve , through the outlet tube , throughthe check valve indicatesthe airpressure available at the outlet sideof and into the air tank . Working air is not available until the regulator . This pressure is controlled by the the compressor has raised the airtank pressure above regulator and is always less or equal to the tank that required at the air outlet . pressure . See " Operating Procedures " . Check Valve : When the air compressor is operating , Tank Pressure Gauge : The tank pressure gauge in - the check valve is " open " , allowing compressed air to dicates the reserve air pressure in the tank . On outfits enter the air tank . When the air compressor reaches with no pressure regulator , this is also the pressure " cut - out " pressure , the check valve " closes " , allowing available at the air outlet . air pressure to remain inside the air tank . Regulator : The air pressure coming from the air tank Pressure Release Valve : The pressure release valve is controlled by the regulator knob . Turn the knob located on the side of the pressure switch , isdesigned clockwise to increase pressure and counterclockwise to automatically release compressed air from the com - to decrease pressure . To avoid minor readjustment pressor head and the outlettube when the aircompres - after making a change in pressure setting , always sor reaches " cut - out " pressure or is shut off . If the air approach the desired pressure from a lower pressure . is not released , the motor will try to start , but will be When reducing from a higher to a lower setting , first unableto . The pressure release valve allowsthe motor reduce to some pressure less than that desired , then to restart freely . When the motor stops running , air will bring up to the desired pressure . Depending on the air be heard escaping from the valve for a few seconds . requirements of each particular accessory , the outlet No air should be heard leaking when the motor is regulated air pressure may have to be adjusted while running . you are operating the accessory . Some models have shut - off valves only and do not include regulators . Pressure Switch : The pressure switch automatically starts the motor when the air tank pressure drops below the factory set " cut - in " pressure . It stops the motor when the air tank pressure reaches the factory set " cut - out " pressure .
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ASSEMBL Y INSTRUCTIONS . . . . . . . . . I . . . . . . . . . . . . . . Items Needed for Assembly 1 . Insert the open end of the handle under the saddle 16 oz . of Sears compressor oil , Sears 9 - 16426 or ( Fig . 1 ) . Before attaching handle , you may have to SAE 20 - 20W ( Grade SF ) pipe thread sealant pull the open ends of the handle apart so they fit tightly against the side of the saddle . Looking in from • a 9 / 16 " socket or open - end wrench for attaching the wheels the open end of the saddle , position the handle toward the two bent tabs , on the inside walls of the , a 7 / 16 " open - end wrench for attaching the foot ex - saddle . Slowlypushtheopen ends of the handle onto tension bracket and air pressure gauge both tabs atthe sametime ( Fig . 2 ) . Continue pushing . a 1 / 4 " open - end wrench to tighten handle set screw the handle into the saddle until the holes on the side , an adjustable wrench for attaching the shut - off valve , air of the saddle and handle are in line . outlet adapter and pressure regulator . 2 . Guide the straight end of each retaining clip through the saddle hole and both handle holes ( Fig . 3 ) . 3 . Rotate each retaining clip clockwise and press down Installing Handle until it snaps into place over the pull handle ( Fig . 4 ) . 4 . If the handle has excessive movement , it is improp - erly installed . Check the following . A . Are both tabs inside the handle ( Step # 1 ) ? B . Does each clip pass through both the saddle THE WHEELS AND HANDLE DO NOT PRO - and handle ( Step # 2 ) ? VIDE ADEQUATE CLEARANCE , STABIL - ITY OR SUPPORT FOR PULLING THE UNIT UP AND DOWN STAIRS OR STEPS . THE UNIT MUST BE LIFTED OR PUSHED UP A RAMP . DO NOT LIFT THE UNIT BY THE MANIFOLD ASSEMBLY . THE UNIT CAN BE DAMAGED . O FIG . 1 FIG . 2 ! T , t , t " - d . m . . . . . . . . . . . I _ 3 IM SIN1NI " I _ D I _ 1 TABS FIG . 3 FIG . 4
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. . . . . . . . . . . . . ASSEMBL Y INSTRUCTIONS I Installing Shut - off Valve ( outfits without regulators ) It may be necessary to brace or support one end of the outfit when attaching the wheels because the air compressor will have a tendency to tip . Installing Rubber Foot Strip and Wheels 1 . Remove the protective paper strip from the adhe - sive - backed rubber foot strip . Attach the rubber foot strip to the bottom of the air tank leg . Press firmly into place . 2 . The leg bracket on the underside of the air compres - sor tank has 2 holes on each side for mounting the wheels . Place one shoulder bolt through the hole in a wheel . On Model No . ( 919.17695 ) , push the bolt through the TOP hole of the leg bracket . For all other Models , push the bolt through the BOTTOM hole of the leg bracket . Screw on one hex locking nut . The Apply a small amount of pipe sealant to the tapered special locking nut does not turn freely . Tighten the pipe threads on the adapter and tighten into the mani - nut firmly until it contacts the tank leg . The outfit will fold . Install the swivel connection end of the shut - off sit level if the wheels are properly installed . valve to the straight threaded end of the adapter ( pipe sealant is not required ) and tighten this connection . Installing Tank Pressure Gauge Applypipe sealant ( not supplied ) to the gauge threads and install in the threaded opening in front of the manifold . Installing Regulator ( for outfits supplied with regulators ) M _ NOTE Use a small amount of pipe thread sealant ( not supplied ) on all pipe thread joints . Install the regulator on the end of the manifold using the short pipe nipple . The arrow on the bottom of the regulator must point away from the mani - fold inorder for the regulator to function prop - erly . Next , installthe gauge , adapter and plug in the regulator . The plug is supplied with the regulator .
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i INSTALLATION AND BREAK - IN PROCEDURES I Extension Cords Location of the Air Compressor Operate the air compressor in a clean , dry and well To avoid voltage dropand power loss to the motor , use ventilated area . The air intake filter must be kept clear extra air hose instead of an extension cord . of obstructions that could interfere with the flow of air through the fan bladed flywheel . The air compressor If an extension cord must be used : crankcase and head are designed with fins to provide use only a 3 - wire extension cord that has a 3 - blade proper cooling . grounding plug and a 3 - slot receptacle that will accept the plug on the product . if humidity is high , a Sears air filter can be installed on make sure the extension cord is in good condition . the air outlet adapter to remove excessive moisture . the extension cord should be no longer than 50 feet . Closely follow the instructions packaged with the filter the minimum wire size is 12 gauge ( AWG ) . ( Wire for proper installation . It must be installed as close as size increases as gauge number decreases . 10 possible to the accessory . AWG and 8 AWG may also be used . DO NOT USE 14 AWG or 16 AWG . ) Do not place the air compressor where heat is exces - sive . Voltage and Circuit Protection Refer to your Outfit Parts Bulletin for voltage and circuit protection requirements of your compressor . Use only a fuse or circuit breaker that is the same rating as the branch circuit the air compressor is operated on . If the Lubrication and Oil compressor is connected to a circuit protected by fuses , use only dual element time delay fuses , as noted in that Service Bulletin . Compressors are shipped without oil . Do not attempt to operate this air compressor without first adding oil to the crankcase . Certain air compressor models can be con - Serious damage can result from even lim - nected to 240 volts from 120 volt operation . ited operation unless filled with oil and When converting a specific model to 240 broken in correctly . Make sure to closely volt operation , the attached three - prong 120 follow initial start - up procedures . volt plug must be replaced with the three - prong 240 volt plug ( purchase locally ) or order line cord Part No . SUDL - 404 - 1 . Place unit on a level surface . Remove oil fill plug and Refer to the Outfit Parts Bulletin for your slowly add a special compressor oil such as Sears 9 - compressor . Certain air compressor mod - 16426 or SAE 20 - 20W SF motor oil until it is even with els can be operated on a 15 amp circuit if : the top of the oil fill hole . ( It must not be allowed to be 1 . Voltage supply to circuit is normal . lower than 3 / 8 " - - 6 threads down - - from the top at any 2 . Circuit is not used to supply any other time . ) When filling the crankcase , the oil flows very electrical needs ( lights , appliances , etc . ) slowly . If the oil is added too quickly , it will overflow and 3 . Extension cords comply with specifica - appear to be full . Crankcase oil capacity is 16 fluid tions in this manual . ounces . Under winter - type conditions use SAE 10W oil . 4 . Circuit is equipped with a 15 amp circuit Multi - viscosity oil , 10W 30 , will leave carbon deposits breaker or 15 amp time delay fuse . on critical components , reducing performance and compressor life . Replace oil fill plug . Some models have a dual voltage motor , 120 and 240 volt . They are wired for 120 volt but can be converted to 240 volt operation . Instructions for connecting these NOTE motors for operation at 240 volt can be found printed on Drain and refillthe compressor pump crank - the inside of the motor covers , or on the nameplate of case after the first 100 hours of operation . these motors • 10
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I . . . . INSTALLATION AND BREAK - IN PROCEDURES ! If these grounding instructions are not completely Grounding Instructions understood , or if you are not sure your compressor is properly grounded , have the installation checked by a qualified electrician . 120 Volt Models 240 Volt Model = IMPROPER GROUNDING CAN RESULT IN ELECTRICAL SHOCK . IN TH EEVENT OF A WhltQ SHORT CIRCUIT , GROUNDING REDUCES THE RISK OF SHOCK BY PROVIDING AN ESCAPE WIRE FOR THE ELECTRIC CUR - RENT . THIS AIR COMPRESSOR MUST BE 20 AMP PLUG PROPERLY GROUNDED . 1 . The air compressor is equipped with a cord having a GROUNDING - _ grounding wire and an appropriate grounding plug . PIN The plug must be used with an outlet that has been P _ N installed and grounded in accordance with all local codes and ordinances . The outlet must have the same configuration as the plug . DO NOT USE AN ADAPTER . 2 . Do not modify the plug that has been provided . If it Piping does not fit the available outlet , the correct outlet should be installed by a qualified electrician . 3 . Inspect the plug and cord before each use . Do not use the compressor if there are signs of damage . Plastic or PVC pipe is not designed for use with compressed air . Regardless of its in - dicated pressure rating , plastic pipe can burst from air pressure . Use only metal pipe for air distribution lines . If apipe line is necessary , use pipe that is the same size as the air tank outlet . Piping that is too small will restrict the flow of air . If piping is over 100 feet long , use the next larger size . Bury underground lines belowthe frost line and avoid pockets where condensation can gather ELECTRICAL SHOCK HAZARD . WHEN RE - and freeze . Apply pressure before underground lines PAIRING OR REPLACING THE CORD OR are covered to make sure all pipe joints are free of PLUG , KEEP THE GROUNDING WIRE leaks . SEPARATE FROM THE CURRENT - CAR - RYING WIRES . NEVER CONNECT THE Connect the piping to the 3 / 8 " NPT air outlet opening GROUNDING WIRE TO A FLAT BLADE at the end of the air tank . PLUG TERMINAL ( THE GROUNDING WIRE HAS INSULATION WITH AN OUTER Additional Regulators and Controls SURFACE THAT IS GREEN - WITH OR Since the airtank pressure is usually greater than that WITHOUT YELLOW STRIPES . ) which is needed , a separate regulator is usually em - ployed to control the air pressure ahead of any individ - ual air driven device . Separate air transformers which combine the function of air regulation , moisture and dirt removal should be used where applicable . 11
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Break - in Procedures This procedure is required only once , before the air compressor is put into service . 1 . Set the pressure switch lever to the " OFF " position . 2 . Plug the power cord into the correct branch circuit receptacle . Serious damage may result if the following 3 . Turn the regulator clockwise ( or open the shut - off break - in instructions are not closely fol - valve ) , opening it fully , to prevent air pressure build - lowed . up in the tank . 4 . Move the pressure switch lever to " ON / AUTO " . The compressor will start . 5 . Run the compressor for 30 minutes . Make sure the regulator , or shut - off valve , is open and there is no tank pressure build - up . 6 . After 30 minutes , close the regulator by turning it counterclockwise or close the shut - off valve by turn - ing the knob clockwise . The air receiver will fill to cut - out pressure and the motor will stop . The compres - sor is now ready for use . OPERATING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ! . . . . . . . . . . . . . . . . . . Daily Start - Up Checklist Perform the following checks before starting the com - Compressed air from the outfit may con - pressor outfit . tain water condensation and oil mist . Do 1 . Make sure that nothing is blocking the belt guard air not spray unfiltered air at an item that openings or air filter opening . could be damaged . Some air operated tools 2 . Pull the ring on all safety valves to make sure the or devices may require filtered air . Read valves move freely and smoothly . instructions for the air tool or device . 3 . Check the oil level ; add oil if necessary . 4 . Clean or blow off fins or any part of compressor that 6 . Open shutoff valve . Your outfit is ready for use . collects dust and dirt . Compressor will run cooler and provide longer service . Start the compressor outfit and check the following : 1 . With the outlet valve closed , start the compressor outfit . Allow the outfit to pump up to cut - off pres - sure . When You Are Finished : 2 . Make sure that all controls are operating correctly . 7 . Set the pressure switch lever to " OFF " . Refer to " Description of Operation " section of this 8 . Close the shutoff valve . manual . 9 . Remove the air tool or accessory . 3 . Check all line fittings and piping for air leaks . Even 10 . Open the shutoff valve and allow the air to slowly minor leaks can cause the compressor to over - bleed from the tank . Close shutoff valve when tank work , resulting in prematu re breakdown or unsatis - pressure is approximately 20 PSI . factory performance . 4 . Check for excessive vibration and noise . 5 . Check for oil leaks . Correct any leaks found . 12
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. . . . . . . . . . . . . . OPERA TING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normal Operation 1 . Before attaching an air hose or accessory , make sure the pressure switch lever is in the " OFF " position . Close the shut - off valve by turning the knob clockwise , or close air regulator outlet by WATER WILL CONDENSE IN THE AIR TANK . turning it counterclockwise . IF NOT DRAINED , WATER WILL CORRODE 2 . Attach hose and accessory . AND WEAKEN AIR TANK , CAUSING A RISK OF AIR TANK RUPTURE . 4 . With tank pressure at approximately 20 PSI , open the drain cock and allow moisture to drain . TOO MUCH AIR PRESSURE CAUSES A HAZARDOUS RISK OF BURSTING . CHECK NOTE THE MANUFACTURER'S MAXIMUM PRES - If the drain cock valve isplugged , release all air SURE RATING FOR AIR TOOLS AND AC - pressure . The valve can then be removed , CESSORIES . THE REGULATOR OUTLET cleaned and reinstalled . PRESSURE MUST NEVER EXCEED THE MAXIMUM PRESSURE RATING . ON MOD - ELS HAVING ONLY A SHUT - OFF VALVE , 5 . After the water has been drained , close the drain YOU MUST INSTALL A REGULATOR cock . The air compressor can now be stored . BEFORE USING ACCESSORIES RATED AT LESS THAN 125 PSIG . 3 . Turn the pressure switch lever to the " ON - AUTO " position and allow tank pressure to build . The motor will stop when tank pressure reaches cut - out pres - sure . 13
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MAINTENANCE . . . . . . . . . . . . I UNIT CYCLES AUTOMATICALLY WHEN POWER IS ON . DURING MAINTE - NANCE , YOU COULD BE EXPOSED TO VOLTAGE SOURCES , COMPRESSED AIR OR MOVING PARTS . PERSONAL INJURIES CAN OCCUR . UNPLUG THE UNIT AND BLEED OFF ALL AIR TANK PRESSURE BEFORE DOING ANY MAINTENANCE OR REPAIR . NEVER OPERATE THE UNIT WITH THE BELT GUARD REMOVED . To ensure efficient operation and longer life of the air compressor outfit , a routine maintenance schedule should be prepared and followed . The following routine maintenance schedule is geared to an outfit in a normal working environment operating on a daily basis . If necessary , the schedule should be modified to suit the conditions under which your compressor is used . The modifications will depend upon the hours of operation and the working environment . Compressor outfits in an extremely dirty and / or hostile environment will require a greater frequency of all maintenance checks . Lubricate compressor motor according to manufacturer's instructions , which are attached to your motor . Routine Maintenance Schedule Every 8 Hours of Operation Every 160 Hours of Operation 1 . Check oil level . Add if necessary . 1 . Check drive belttension ; adjust if necessary . ( Refer 2 . Drain water from the air tank , any moisture sepa - to SERVICE INSTRUCTIONS in this manual . ) rators or transformers . 2 . Inspect air lines and fittings for leaks ; correct as 3 . Check for any unusual noise and / or vibration . necessary . 4 . Manually check all safety valves to make sure they 3 . Check the alignment of the motor pulley to the fly - are operating properly . wheel . If necessary , align to within 1 / 32 inch on centerline . 5 . Inspect for oil leaks and repair any leaks found . Every 40 Hours of Operation Each Year of Operation 1 . Clean and inspect the air intake filter ; replace if or if a Problem is Suspected necesssary . Check condition of air compressor pump intake and 2 . Inspect condition of drive belt ; replace if neces - exhaust valves . Replace if damaged or worn out . sary . Every 100 Hours of Operation 1 . Drain and refill compressor crankcase with16 fluid ounces ( 473.2 ml ) of clean oil , Sears 9 - 16426 or SAE 20 - 20W . ( Use SAE 10W oil under winter - type conditions . ) 2 . Increase frequency of oil changes if humidity or operating conditions are extreme . 14
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! . . . . SERWCE NsTRUcT ONs i Air Filter - Inspection and Check Valve - Inspection and Replacement Replacement NOTE Remove and inspect the check valve at least once a year or more often if the compressor is heavily used . Keep the air filter clean at all times . Do not Moisture and other contaminants in the hot com - operate the compressor with the air filter re - pressed air will cause an accumulation of a carbon - like moved . residue on the working parts . If the valve has heavy carbon build - up , it should be replaced . Use the follow - A dirty air filter will not allow the compressor to operate ing procedure to inspect , clean or replace the check at full capacity . Before you use the compressor , check valve . the air filter to be sure it is clean . 1 . Unplug compressor . Release air pressure from the Ifit is dirty , replace it with a new filter . On some models , air tank . the filter may be removed by using a pair of needle 2 . Loosen the top and bottom tube nuts and remove nosed pliers or a screwdriver . Pull or pry out the old the outlet tube . filter . Push in the new air filter . Other models require 3 . Unscrew the check valve ( turn counterclockwise ) removal of the belt guard and / or filter retainer . using socket wrench ( 7 / 8 " ) . 4 . Check that the valve disc moves freely and that the spring holds the disc in the upper , closed position . The check valve may be cleaned with a solvent . 5 . Apply sealant to the check valve threads . Reinstall the check valve ( turn clockwise ) . Do not over - tighten . 6 . Replace the outlet tube and tighten top and bottom tube nuts . Safety Valve - Inspection and Oil - Checking and Changing Replacement Overfilling with oil will cause premature IF THE SAFETY VALVE DOES NOT WORK compressor failure . Do not overfill . PROPERLY , OVER - PRESSURIZATION MAY OCCUR , CAUSING AIR TANK RUPTURE OR EXPLOSION . OCCASIONALLY PULL Check oil level in the crankcase daily . Remove the oil THE RING ON THE SAFETY VALVE TO fill plug . The oil level should be even with the top of the MAKE SURE THAT THE SAFETY VALVE fill hole and must not be allowed to be lower than 3 / 8 " OPERATES FREELY . IF THE VALVE IS from the top ( 6 threads ) at any time . It is recommended STUCK OR DOES NOT OPERATE that the oil be changed after every 100 hours of SMOOTHLY , IT MUST BE REPLACED WITH operation . To drain the oil , removethe oildrain plug and A VALVE HAVING THE SAME PRESSURE collect the oil in a suitable container . Be sure to replace RATING . the plug securely before adding new oil . Use a special compressor oil such as Sears 9 - 16426 orSAE 20 - 20W SF motor oil . [ Crankcase oil capacity is 16 fluid ounces ( 473.2 ml ) . ] Under winter - type conditions use SAE 10W . 15
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. . . . . . SERVICE INSTRUCTIONS Belt - Replacement 3 . Remove belt and replace . NOTE The belt must be centered over the grooves on the flywheel and motor pulley . SERIOUS INJURY OR DAMAGE MAY OCCUR IF PARTS OF THE BODY OR LOOSE ITEMS GET CAUGHT IN MOVING PARTS . 4 . Replace the front of the belt guard . NEVER OPERATE THE OUTFIT WITH THE BELT GUARD REMOVED . THE BELT Adjust Belt Tension GUARD SHOULD BE REMOVED ONLY WHEN THE COMPRESSOR IS UN - Adjust belt tension by tightening the wing nut until it PLUGGED . makes contact with the washer , plus one additional turn . Belt Guard - Removal and Installation ( Refer to Outfit Parts Bulletin , if required . ) 1 . Move the " ON / AUTO - OFF " lever to the " OFF " po - sition . Unplug the compressor . Release all air tank Pressure Switch - Replacement pressu re . 2 . Disconnect the motor cord from the motor . Pull the cord out , from beneath the saddle , toward the pres - sure switch . 3 . Disconnect the pressure release tube from the pressure switch . Place a wrench on the release PRESSURE LOADS BEYOND DESIGN LIM - valve to prevent it from rotating . Place another ITS MAY CAUSE TANK RUPTURE OR EX - wrench on tube nut and unscrew and remove . PLOSION . PRESSURE SWITCH OPERA - 4 . Using a flat - bladed screwdriver , push down on top TION IS RELATED TO MOTOR HP , TANK RATING AND SAFETY VALVE SETrlNG . of the manifold tube fitting adapter while pulling up on the tube . This will disconnect the manifold tube DO NOT A'n'EMPT TO ADJUST , REMOVE from the tank fitting . OR DEFEAT THE PRESSURE SWITCH , OR CHANGE AND MODIFY ANY PRESSURE 5 . Remove the two beltguard screws on the bottom front of the outfit . CONTROL RELATED DEVICE . IF REPLACE - 6 . If so equipped , remove inside guard from saddle . MENT IS NECESSARY , THE SAME RATED SWITCH MUST BE USED . Replace Belt 1 . Unplug compressor . 2 . Remove the front of the belt guard by disengaging the snaps . Insert a flat bladed screwdriver at each snap location and pry the beltguard apart . NOTE Forcompressors witha motor hold down plate , loosenthe wing nutat the holddown plate . The motorcan be tilted to allow for easy removal or installation of the belt . For compressors with a motor tension spring , lift motor until belt can be removed or installed . 16
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l . . . . . . . . . . . . . . . . . . . . . S . . v . . . . R . . v . . l . . c . E . . . l . u . . S . . m . . . u . crio . u . . s . . . . . . . . . . . . . . . . . I . . . . . . . . . . . . . . . . . . . . . . . . Air Compressor Pump - Motor Overload Protector - Reset Replacement The motor has a manual thermal overload protector . If Disassembly , or service , of the air compressor pump the motor overheats for any reason , the overload beyond what is covered in this manual is not recom - protector will shut off the motor . The motor must be mended . If additional service is required , contact the allowed to cool down before restarting . Turn the unit service center of your local Sears store . Refer to the off . To restart , depress the red reset button located on " Air Compressor Pump Parts List " for your pump for the end of the motor and turn ON / AUTO - OFF switch to additional information . Removal of the air compressor the ON position . pump is as follows : NOTE 1 . Lock out the power supply and relieve all air If the overload protector shuts the motor off pressure from the air tank . frequently , check for a possible voltage prob - 2 . Remove the belt guard as noted in " Belt Guard - lem . Low voltage can also be suspected when : Removal and Installation " in this manual . If so equipped , remove inside guard from saddle . 1 . The motor does not get up to full power or 3 . Remove the drive belt , as noted in " Belt - Replace - speed . ment " in this manual . 2 . Fuses blow out when the motor is started . 4 . Disconnect all air lines from the compressor . 3 . Lights dim when motor is started , and remain dim while it is running . NOTE Remove the belt guard bracket , if equipped , for installation on new compressor outfit . Motor Lubrication 5 . Remove compressor mounting bolts and remove the compressor . Replace with a new compressor . Lubricate motor according to manufacturer's instruc - 6 . Remove old flywheel and inspect for damage . Re - tions , which are attached to your motor . place flywheel if required . Install flywheeland torque flywheel cap screw to 20 to 25 foot pounds . 7 . Install mounting screws , securing new compressor to the saddle . Torque 5 / 16 inch mounting screws to Motor - Replacement 10 to 12 foot pounds . 8 . Check the alignment of the flywheel to the motor 1 . Unplug compressor and relieve all air pressure pulley . The motor pulley must align to the flywheel from the tank . within 1 / 32 inch on centerline . Adjust as necessary . 2 . Remove the belt guard . 9 . Install drive belt . Make sure the belt is centered on 3 . Remove drive belt . the motor pulley and flywheel grooves . 4 . Loosen the motor pulley set screw and remove the 10 . Connect all air lines to the compressor pump . pulley . 11 . To install the belt guard bracket , remove the nut 5 . Remove the motor cover plate and disconnect the from the stud on the compressor pump . Assemble leads from the power cord . the guard bracket and torque nut to 20 to 25 foot 6 . Disconnect the motor mounting plate from the pounds . saddle and remove the motor . Replace with a new 12 . Adjust the belt tension as noted in " Belt - Replace - motor and reinstall on the saddle . ment " in this manual . 7 . Connect the power cord leads to the motor follow - ing the diagram on the cover plate . 8 . Install the motor pulley and align it to the flywheel within 1 / 32 inch on centerline . 1 / 4 " set screws - 70 - 80 in - lbs . Air compressor pumps are shipped with - 5 / 16 " set screws - 160 - 170 in - lbs . out oil . Do not attempt to operate the 3 / 8 " set screws - 285 - 295 in - lbs . compressor for any reason without first 9 . Reinstall the drive belt . Make sure the belt is adding oil to the compressor pump crank - centered in the motor pulley and flywheel . case . Serious damage can result from even 10 . Adjust the belt tension as described in " Belt - Re - very limited use under these circumstances , placement " procedure in this manual . 17
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. . . . . SERVICE INSTRUCTIONS 1 13 . Remove oil fill plug . Slowly add 16 fluid ounces of Separate Regulator or Shut - Off special compressor oil , Sears 9 - 16426 or SAE 20 - Valve - Replacement 20W SF motor oil . ( Under winter - type conditions use single weight SAE 10W oil . ) Reinstall oil fill For replacement of separate regulator or shut - off plug . Refer to " Initial Start - Up Procedures " in this valve , remove component . Apply sealant to valve or manual . These instructions must be followed to regulator threads . Reinstall component by turning properly break in the new pump . clockwise . Do not overtighten . 14 . Turn the fused disconnect or circuit breaker to the ON position . 15 . Perform the " Break - in Procedures " as described in this manual . Pulley and Flywheel - Alignment Servicing Intake and Exhaust The compressor flywheel and motor pulley grooves The intake and exhaust valves as well as the valve must be in - line ( in the same plane ) within 1 / 32 " to plates and cylinder head will , over a period of time , assure belt alignment within sheave grooves . To check accumulate a residue of carbon - like material on their alignment , disconnect electrical power and remove the surfaces . The material will decrease the efficiency of beltguard . Place a straight edge against the outside of the compressor . These components should be in - the flywheel and measure the distance from it to the spected whenever a problem is suspected and cleaned nearest groove . Alignment is achieved when the other or replaced with new parts . Refer to " Outfit Parts List " , end of the straight edge is within 1 / 32 " of the measured if required . Use the following procedure to inspect the dimension at the pulley grooves . parts . 1 . Unplug compressor and relieve all air pressure from the air tank . 2 . Remove belt guard as noted in " Belt Guard - Removal and Installation " in this manual . Manifold / Regulator Assembly - 3 . Disconnect the pressure release and outlet lines Removal and Installation from the air compressor . 4 . Remove the hardware securing the cylinder head For models equipped with a combined manifold and and remove the cylinder head and valve plate . regulator , perform the following steps : 1 . Removethe beltguard . See " Belt Guard - Removal and Installation " in this manual . 2 . Remove the regulator panel rut by turning it counter - MANY SOLVENTS ARE HIGHLY FLAM - clockwise . As this nut is being removed , it will push MABLE AND A HEALTH HAZARD IF IN - off the snap - on regulator knob . HALED . ALWAYS OBSERVE THE SOLVENT 3 . Unscrew and remove the air outlet adapter . MANUFACTURER'S SAFETY INSTRUC - 4 . Unscrew and remove the safety valve and washer . TIONS AND WARNINGS . 5 . Using a flat - bladed screwdriver , push down on the top brass ring of the manifold tank fitting adapter , while pulling up on the manifold tube . 5 . Clean carbon deposits in head cavities and valve 6 . Remove the manifold from the belt guard . plates with lacquer thinner or other suitable solvent . 7 . Other parts on the manifold / regulator can be re - 6 . Clean the intake and exhaust valves with lacquer moved . thinner or other suitable solvent . Inspect valves ; re - 8 . Reverse the above procedures for reinstalling parts . place if necessary . Tighten the manifold tube nut to the manifold using 60 to 70 inch pounds . Tighten the safety valve until it stops rotating . Push the manifold tube into the tank fitting until it won _ go any further . 18
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l . . . S . . ERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . NOTE Do not use gasket cement on any gasket 7 . Reinstall valve plate and gaskets . surface as this may clog compressor valve 8 . Install the cylinder head . Snug mounting screws cavities and flow areas . and studs tight , then torque to 25 to 30 foot pounds starting at the center and working toward the out - side . 9 . Reconnect the pressure release and outlet lines to the compressor pump . i STORAGE OF COMPRESSOR OUTFIT I 1 . Review the " Maintenance " section on the preced - 3 . Remove any air tool or accessory . ing pages and perform scheduled maintenance as 4 . Protect the electrical cord and air hose from dam - necessary . Drain the water from the air tank . age ( such as being stepped on or run over ) . Wind 2 . Set the ON / AUTO - OFF switch to the " OFF " posi - them loosely around the outfit handle . tion , and unplug the unit . 5 . Store the compressor in a clean and dry location . 19
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WARNING PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES , MOVING PARTS OR COMPRESSEDAIR SOURCES . PERSONAL INJURY MAY OCCUR . PRIOR TO AI - rEMPTING ANY REPAIRS , UNPLUG THE COMPRESSOR AND BLEED OFF ALL TANK AIR PRESSURE . PROBLEM CAUSE CORRECTION Pressureswitchdoesnotshut offmotor Excessivetank pressure - safety Movethe pressure switchlever tothe " OFF " position . If the outfit doesn't shut off , and the electrical con - valve pops off . when compressorreaches " cut - out " pressure . tacts are welded together , replace the pressure switch . Ifthe contactsare good , checkto see ifthe pininthe bottomof the pressurerelease valve is stuck . If it doesnot movefreely , replace the valve . Retum the outfitto Sears Service Center to check Pressure switch " cut - out " too high . and adjust , orreplace switch . Air leaks at fittings . Tube fittings are not tight enough . Tighten fittings where air can be heard escaping . Check fittings with soapy water solution . DO NOT OVER - TIGHTEN . Airleaksat or insidecheck valve . A defective check valve results in a constant air leak Defective or dirty check valve . at the pressure release valve when there is pressure in the tank and the compressor is shut off . Remove and clean or replace check valve . DO NOT OVER - TIGHTEN . Air leaks at pressure switch Defectivepressureswitchreleasevalve . Remove and replace the release valve . release valve . Defective check valve . A defective check valve results in a constant air leak at the pressure release valve when there is pressure in the tank and the compressor is shut off . Remove and clean or replace check valve . DO NOT OVER - TIGHTEN . Air leaksin airtank orat airtank Defective air tank . Airtank must be replaced . Do not repair the leak . welds . WARNING I DO NOT DRILL INTO , WELD OR OTHERWISE MODIFY AIR TANK OR IT WILL WEAKEN . THE TANK CAN RUPTURE OR EXPLODE . Air leak from safety valve Possible defect in safety valve Operate safetyvalve manuallyby pullingon ring . If valve stillleaks , it mustbe replaced . Restricted of defective check valve . Knocking noise Remove and clean or replace . Loose pulley . 13ghtenpulley set screw , 70 - 80 in . - Ibs . Low oil level . Maintain prescribedoil level . Add oil . Loose flywheel . Tighten screw 15 - 20 ft . Ibs . Loose compressor mounting screws . Check screws . Tighten as required . ( 15 - 20 ft . - Ibs . ) 20
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CORRECTION PROBLEM CAUSE Loosebelt . KnockingNoise Tightenwingnut untilitcontactsthewasher , plusone more turn . ( Continued . . . ) Carbon build - up . Remove the head and valve plate . Cleanthe valve plate andtopofthe piston . ( Be surecarbondoes not fall into the cylinder . ) Reassemble to 25 - 30 ft . Ibs . using new gasket and torque screws . Belt too tight . Adjust belt tension ( see " Belt Replacement " . ) Defective check valve . See " Air leak at check valve . " Continuous air relievingfrom pressure switch releasevalve after shut - off . Motorwill not run . Let the motor cool off and reset switch by pressing Motor overload protection switchhas the red button located on the end of the motor . If the tripped . overload still trips , check for defective capacitor . Tankpressureexceedspressureswitch Motor wilt start automatically when tank pressure " cut - in " pressure . drops below " cut - in " pressure of pressure switch . Check valve stuck open - fails to re - Remove and clean , or replace . DO NOT OVER - TIGHTEN . lieve head pressure ; motor cannot start . Loose electrical connections . Check wiringconnectioninsidepressureswitchand motorterminalbox area . Possibledefectivecapacitor . Return to Sears Service Center for inspectionor replacementif necessary . Possible defective motor . Havecheckedat a local Sears service Center . Fuse blown , circuit breaker tripped . 1 . Check fuse box for blown fuse and replace if necessary . Reset circuitbreaker . Do not use a fuse orcircuitbreakerwithhigherratingthanthat specifiedfor your particularbranchcircuit . 2 . Check for proper fuse ; only Buss " Fusetron " Type T fuses are acceptable . 3 . Checkfor low voltageconditions . 4 . Removecheck valve and cleanorreplaceif it is stuckopen or closed . 5 . Disconnectany other electricalappliancesfrom circuit . The compressormustoperateonitsown branchcircuit . 6 . Do notuse an extension cord . Pressure release valve on pressure Bleedthe line by pushingthe leveronthe pressure switch has not unloaded head pres - switchto the OFF position , openingthe pressure sure . releasevalve . If the valve stilldoesn'topen , it must be replaced . Have checked at Sears Service Center . Do not Paintspray on internalmotor parts . operate the compressor in the spray area . See FlammableVapor Warning . Restricted air intake . Dirty airfilter . Replacefilter . 21
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TROUBLESHOOTING GUIDE ! PROBLEM CORRECTION CAUSE Compressor is not supplying Prolongedexcessiveuse of air . Decreaseamountof air usage . enough air to operate accesso - ries . Compressorisnotlargeenoughfor air Check the accessoryair requirement . If it is higher requirement . thanthe CFM , SCFM or pressuresuppliedby your aircompressor , youneed a largercompressor . Restricted air intake filter Clean orreplaceair intakefilter . Do notoperatethe compressorinthe paint sprayarea . Loose belt . Adjustbelttension . Hole in hose . Checkand replaceif required . Check valve restricted . Removeandcleanor replace . Airleaks . Tightenfittings . ( See " Air Leaks " sectionof " Trou - bleshootingGuide " . ) Excessive belt wear . Loose belt . Adjusttensionper instructions . ( See " Belt Adjust - ment orReplacement " section inthis manual . ) Tight belt . Adjusttension . ( See " Belt Adjustment " sectioninthis manual . ) Loose pulley . Checkforwornkeywayorpulleybore . Alsocheckfor bent motor shaft . Replace parts if necessary . Motorpulley andflywheel must be inline within 1 / 32 " . Pulleymisalignment . ( See " Pulley andFlywheel - Alignment " section inthis manual . ) Squealing sound . Loosebelt . Adjust belttension . ( See " Belt Replacement " section inthis manual . ) There is no oil in the compressor . Add oil to top of fill hole in base . Pressure reading on the regu - Itisnormalfor " some " pressure dropto If there is an excessive amount of pressure drop latedpressuregaugedropswhen OCCUr . when the accessory is used , adjust the regulator . an accessoryis used . NOTE Adjust the regulated pressure under flow conditions ( while the accessory is being used ) . Regulatorknob - continuous air Dirty or damaged regulator intemal Clean or replace regulator or intemal parts . leak . Regulator will not shut off parts . at air outlet . 22
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i . . . . . . . . . . . . . . . . . _ SERVICE NOTES 1 23
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GENERAL MANUAL FOR SEARS OIL LUBRICATED CRAFTSMAN SINGLE STAGE AIR COMPRESSORS Now that you have purchased your Sears Air Compressor , should a SERVICE need ever exist for repair parts or service , simply contact any Sears Service Center and most Sears , Roebuck and Co . stores . Be sure to provide all pertinent facts when you call or visit . The model number of your Sears Air Compressor can be found on the MODEL NO . label which is located on the back of the shroud . WHEN ORDERING REPAIR PARTS , ALWAYS GIVE THE FOL - HOW TO ORDER LOWING INFORMATION : REPAIR PARTS PART NUMBER • PART DESCRIPTION MODEL NUMBER NAME OF ITEM All parts listed may be ordered from any Sears Service Center and most Sears stores . If the parts you need are not stocked locally , your order will be electronically transmitted to a Sears Repair Parts Distribution Center for handling . Sears , Roebuck and Co . , Chicago , IL 60684 U . S . A .
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