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Operator's Manual Edger Models 521 550 551 Model 550 and 551 Shown IMPORTANT : READ SAFETY RULES AND INSTRUCTIONS CAREFULLY Warning : This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest - covered , brush - covered or grass - covered land unless the engine's exhaust system is equipped with a spark arrester meeting applicable local or state laws ( if any ) . If a spark arrester is used , it should be maintained in effective working order by the operator . In the State of California the above is required by law ( Section 4442 of the California Public Resources Code ) . Other states may have similar laws . Federal laws apply on federal lands . A spark arrester for the muffler is available through your nearest engine authorized service dealer or contact the service department , P . O . Box 361131 Cleveland , Ohio 44 ! 36 - 0019 . MTD LLC , P . O . BOX 361131 CLEVELAND , OHIO 44136 - 0019 PRINTED IN U . S . A . FORM NO . 769 - 00527B ( 5 / 03 )
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TABLEOFCONTENTS Content Page Important Safe Operation Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Assembling The Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Know The Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operating The Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Making Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Maintaining and Servicing The Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Off Season Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 FINDINGMODELNUMBER This Operator's Manual is an important part of your new edger . It will help you assemble , prepare and maintain the unit for best performance . Please read and understand what it says . Before you start assembling your new equipment , please locate the model plate on the equipment and copy the information from it in the space provided below . The information on the model plate is very important if you need help from the MTD Customer Support Department . You can locate the model number by looking on the surface of the base plate in the rear of the edger . A sample model plate is explained below . For future reference , please copy the model number and the serial number of the equipment in the space below . ( Model Number ) Copy the model number here : ( Serial Number ) Copy the serial number here : P . O . BOX 361131 CLEVELAND , OH 44136 330 - 220 - 4683 www : mtdproducts : com 800 - 800 - 731 0 F ENGINEINFORMATION The engine manufacturer is responsible for all engine - related issues with regards to performance , power - rating , specifications , warranty and service . Please refer to the engine manufacturer's Owner's / Operator's Manual packed separately with your unit for more information . CALLINGCUSTOMERSUPPORT If you have difficulty assembling this product or have any questions regarding the controls , operation or maintenance of this unit , please call the Customer Support Department . Please have your unit's model number and serial number ready when you call . See previous section Call 1 - ( 330 ) 220 - 4MTD ( 4683 ) or 1 - ( 800 ) - 800 - 7310 to reach a Customer Support representative . to locate this information . You will be asked to enter the serial number in order to process your call .
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SECTION1 : IMPORTANTSAFEOPERATIONPRACTICES WARNING : THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH , IF NOT FOLLOWED , COULD ENDANGER THE PERSONAL SAFETY AND / OR PROPERTY OF YOURSELF AND OTHERS . READ AND FOLLOW ALL INSTRUCTIONS IN THIS MANUAL BEFORE ATTEMPTING TO OPERATE THIS MACHINE . FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY . WHEN YOU SEE THIS SYMBOL - - HEED ITS WARNING . WARNING : The Engine Exhaust from this product contains chemicals known to the State of California to cause cancer , birth defects or other reproductive harm . DANGER : This machine was built to be operated according to the rules for safe operation in this manual . As with any type of power equipment , carelessness or error on the part of the operator can result in serious injury . If you violate any of these rules , you may cause serious injury to yourself or others . . Never attempt to make any adjustments while the TRAINING engine is running , except where specifically 1 . Read , understand , and follow all instructions on the recommended in the operator's manual . machine and in the manual ( s ) before attempting to . To avoid personal injury or property damage use assemble and operate . Keep this manual in a safe extreme care in handling gasoline . Gasoline is place for future and regular reference and for extremely flammable and the vapors are explosive . ordering replacement parts . Serious personal injury can occur when gasoline is 2 . Be familiar with all controls and their proper spilled on yourself or your clothes which can ignite . operation . Know how to stop the machine and Washer your skin and change clothes immediately . disengage them quickly . a . Use only an approved gasoline container . 3 . Never allow children under 14 years old to operate b . Extinguish all cigarettes , cigars , pipes and this machine . Children 14 years old and over other sources of ignition . should read and understand the operation c . Neverfuel machine indoors . instructions and safety rules in this manual and d . Never remove gas cap or add fuel while the should be trained and supervised by a parent . engine is hot or running . 4 . Never allow adults to operate this machine without e . Allow engine to cool at least two minutes proper instruction . before refueling . 5 . To help avoid blade contact or a thrown object f . Never over fill fuel tank . Fill tank to no more injury , keep bystanders , helpers , children and pets than ½ inch below bottom of filler neck to at least 75 feet from the machine while it is in provide space for fuel expansion . operation . Stop machine if anyone enters the area . g . Replace gasoline cap and tighten securely . h . If gasoline is spilled , wipe it off the engine PREPARATION and equipment . Move unit to another area . Wait five minutes before starting the engine . 1 . Thoroughly inspect the area where the equipment i . Never store the machine or fuel container is to be used . Remove all stones , sticks , wire , inside where there is an open flame , spark or bones , toys and other foreign objects which could pilot light as on a water heater , space heater , be tripped over or picked up and thrown by the furnace , clothes dryer or other gas blade . Thrown objects can cause serious personal appliances . injury . j . Allow machine to cool at least 5 minutes 2 . Always wear safety glasses or safety goggles before storing . during operation and while performing an adjustment or repair to protect your eyes . Thrown OPERATION objects which ricochet can cause serious injury to the eyes . 1 . Do not put hands or feet near rotating parts . 3 . Wear sturdy , rough - soled work shoes and close - Contact with the rotating blade can amputate hands fitting slacks and shirts . Shirts and pants that cover and feet . the arms and legs and steel - toed shoes are 2 . The blade control handle is a safety device . Never recommended . Never operate this machine in bare bypass its operation . Doing so , makes the machine feet , sandals , slippery or light weight ( e . g . canvas ) unsafe and may cause personal injury . shoes . 3 . Never operate without blade guard , debris shield and blade control handle in place and working .
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4 . Neveroperatewithdamagedsafetydevices . 18 . Onlyusepartsandaccessoriems adeforthisso , Failuretodoso , canresultinpersonailnjury . machinebythemanufactureFr . ailuretodo can 5 . Neverrunanengineindoorsorinapoorly resultinpersonainl jury . 19 . Ifsituationsoccurwhicharenotcoveredinthis ventilatedarea . Engineexhausct ontainscarbon monoxidea , nodorlessanddeadlygas . manualu , secareandgoodjudgmentC . ontacatn 6 . Donotoperatemachinewhileundertheinfluence authorizeMdTD service dealer or telephone 1 - 800 - 800 - 7310 . ofalcohool rdrugs . 7 . Mufflerandenginebecomehotandcancausea burn . Donottouch . MAINTENANCEANDSTORAGE 8 . Neveroperatethismachinewithougt oodvisibilitya 1 . Never tamper with safety devices . Check their orlight . Alwaysbesureofyourfootingandkeep proper operation regularly . firmholdonthehandlesW . alk , neverrun . 2 . Before cleaning , repairing , or inspecting , 9 . Donotoperatethismachineifithasbeendropped disconnect the spark plug wire and ground against ordamagedR . neturnmachinetoyournearestnd the engine to prevent unintended starting . authorizesdervicingdealefrorexaminatioa 3 . Check bolts , and screws for proper tightness at repair . frequent intervals to keep the machine in safe 10 . Donotoperatethismachinewithadamagedor working condition . Also , visually inspect machine excessivelwyorncuttingblade . for any damage . 11 . Neverattempttoclearmateriaflromthebladengine 4 . Do not change the engine governor setting or over - guardwhiletheengineisrunningS . ohuttheeundrting . speed the engine . The governor controls the off , disconnectht esparkplugwireandgresdtamptintgo maximum safe operating speed of the engine . againsttheenginetoprevenutnintendatte 5 . The blade , blade guard and debris shield are 12 . Donotoverloadmachinecapacityby subject to wear and damage . For your safety edgeattoofastofarate . protection , frequently check all components and 13 . Stayalertforunevensidewalkste , rrainetc . Always replace with original equipment manufacturer's pushslowlyoverroughsurfacesD . onotusethis ( O . E . M . ) parts only . " Use of parts which do not machineongravesl urfaces . meet the original equipment specifications may 14 . Donotoperatemachineinrainorwetsoil lead to improper performance and compromise conditions . safety ! " h15 . Alwaysoperatemachinefrombehindthehandlest 6 . Maintain or replace safety and instruction labels , as andpositionyourselwf herethedirectlineofsig necessary . tocuttingbladeisblockedbyguards . 7 . Observe proper disposal laws and regulations for 16 . Alwaysstopenginewhenedgingortrimmingisne gas , oil , etc . to protect the environment . delayedorwhentransportinmg achinefromo 8 . Never store the machine or fuel container inside locationtoanother . where there is an open flame , spark or pilot light 17 . NeverleavearunningmachineunattendedS.topundg . such as a water heater , furnace , clothes dryer etc . theengined , isconnecstparkplugwireandgrortin 9 . Always refer to the operator's manual for proper againsttheenginetoprevenutnintendesdta instructions on off - season storage . Restrict the use of this power machine to persons who read , understand and follow the warnings , _ WARNING : YOUR RESPONSIBILITY and instructions in this manual and on the machine . I : | ! _ ' 1 = ] : : 1 • 1 Figure 1 4
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SECTION2 : ASSEMBLINGYOUREDGER IMPORTANT : This unit is shipped WITHOUT Upper Handle GASOLINE or OIL . After setting up the unit , service engine with gasoline and oil as instructed in the separate engine manual packed with your unit . NOTE : Reference to right or left hand side of the edger is observed from the operating position . Groundingthe Engine'sSparkPlug Blade Control Bail • Disconnect the spark plug wire from the spark plug and ground against the engine . Positioning the EdgerHandles • Remove and discard any packaging cardboard that may be present between the upper handle and the Rope Guide lower handle . g Knob • Depress the blade control bail at the top of the upper handle and pivot the upper handle upward until it snaps into place . Figure 3 • Tighten the wing knobs which are located on both the left and right sides of the handle . See Figure 2 . IMPORTANT : Make certain that the engine's spark plug wire is properly grounded as instructed earlier in this section before proceeding on to the next step . Wing Knobs • Stand behind the unit and hold the blade control Upper Handle bail against the upper handle and gently pull the starter rope out of the engine . when the starter rope is pulled . _ ARNING : The edger blade WILL rotate NOTE : The starter rope will not pull out of the engine unless the blade control bail ( refer to Figure 3 ) is depressed against the upper handle . Lower Handle • Slip the starter rope through the top of the rope guide . • Retighten the wing knob which secures the rope guide to the upper handle . Figure 2 AttachingtheStarterRope • Locate the eyebolt found on the right side of the upper handle . • Loosen , but do NOT remove , the wing knob which secures the rope guide to the upper handle . See Figure 3 .
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SECTION3 : KNOWTHEEDGER Blade Depth Control Lever ( Transport Position Shown ) Pull Rope / Recoil Starter Curb Height Adjustment Lever \ ( If Equipped ) Bevel Adjustment Primer Spindle Sheaves Belt Guard NOTE : Wheel and blade styles vary by model . Yours may differ slightly . Model 550 and 551 Shown . Figure 4 BladeDepthControlLever and their proper operation . Know how to , _ WARNING : Be familiar with all controls The blade depth control lever is located on the right stop the machine and disengage them side of the upper handle . It is used to control the depth quickly . of the cut . The further forward the blade depth control NOTE : Refer to the Engine Manual packed with your lever is moved , the deeper into the soil the edger blade edger for a detailed description of all engine - related will cut . See Figure 4 . controls and components . BevelAdjustmenLtever ( ifsoequipped ) Pull Rope / RecoilStarter The bevel adjustment lever , if so equipped , is located The pull rope / recoil starter is used to start the engine . on the front , left portion of the edger , behind the edger blade . It is used to vary the angle of the edger blade Primer between one of three positions for edging / trenching or beveled edging . See Figure 4 . The primer is used to pump gas into the carburetor and aid in starting the engine . Use it to start a cold engine , CurbHeightAdjustmenLtever but do not use it to restart a warm engine after a short shutdown . ( ifsoequipped ) NOTE : Refer to the Engine Manual packed with your The curb height adjustment lever , if so equipped , is edger for a detailed description of all engine - related found on the rear portion of the edger . When placed in controls and components . an applicable notch , it aids in stabilizing the edger while edging grass along a curb . See Figure 4 . BladeControlBail IMPORTANT : Become familiar with all the controls Located on the upper handle , the blade control bail before operating the edger . must be depressed against the upper handle in order to operate the unit . Releasing the blade control stops the engine and the edger blade . See Figure 4 .
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SECTION4 : OPERATINGTHEEDGER The operation of any edger can result IMPORTANT : Using the primer to restart a warm engine in foreign objects being thrown into after a short shutdown is usually not necessary . Doing the eyes , which can result in severe so may result in a flooded engine . eye damage . Always wear safety • Standing behind the unit , depress the blade control glasses or eye shields . We bail and hold it against the upper handle with your recommend wide vision safety mask left hand . for over spectacles or standard safety glasses safety device . Never attempt to bypass its _ WARNING : This control mechanism is a operation . over concrete , asphalt , rocks or the like . The , _ WARNING : Do not lower blade if blade is • With your right hand , grasp the recoil starter handle blade can strike the supporting surface , and slowly pull the rope outward until engine resulting in personal injury or property reaches the start of its compression cycle ( the rope damage . will pull slightly harder at this point ) . • After slowly allowing the rope to recoil , pull the rope AddingGasolineAndOil with a rapid , continuous , full arm stroke . Keep a firm Service the engine with gasoline and oil as instructed in grip on starter handle throughout the entire stroke . the Engine Manual packed with your edger . Read • Allow the starter handle to slowly return to the instructions carefully . eyebolt . NOTE : If the engine fails to start after three pulls , engine running or until the engine has been depress the primer an additional two times before , _ WARNING : Never fill fuel tank indoors , with allowed to cool for at least two minutes after pulling the starter rope again . running . To begin edging , proceed as follows : • Move the blade depth control lever to the left and StartingThe Engine place it into any of the five lower notches . The NOTE : Refer to the Engine Manual packed with your further forward the blade depth control lever is edger for a detailed description of all engine - related moved , the deeper or lower the blade will cut into controls and components . the ground . IMPORTANT : For best results , proceed slowly along the To start the edger's engine , proceed as follows : path being edged , slowly moving the edger back and • Attach the spark plug wire to the spark plug . Make forth through the cutting area . certain the metal cap on the end of the spark plug wire is fastened securely over the metal tip on the StoppingThe Engine spark plug . • Move the blade depth control lever back to the To stop the edger's engine , proceed as follows : START position in the adjacent ( top ) notch . • Release the blade control handle . • Depress the primer bulb three times , pausing two to IMPORTANT : Make certain that the engine's spark plug three seconds between each push . In cold weather wire is properly grounded as instructed in SECTION 2 : ( below 50 ° F / 19 ° C ) , it may be necessary to depress Assembling The Edger before storing the edger for its the primer bulb four or five times . next use .
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SECTION5 : MAKINGADJUSTMENTS BevelAdjustmen ( tmodelssoequipped ) Edging Set the bevel adjustment lever ( refer to Figure 5 ) in the NOTE : Edger features vary by model . Aft edger models center notch to place the edger blade in a 90 ° position do NOT come equipped for blade tilt adjustment nor is for edging . See Figure 7 . there a blade tilt kit available to modify your edger if it was not purchased equipped to do so . The angle of the edger blade can be adjusted by placing the bevel adjustment lever in one of three positions for edging / trenching or beveled edging . See Figure 5 . Edging / Trenching Figure 7 Bevel Adjustment Trenching ( modelssoequipped ) Lever NOTE : Edger features vary by model . Aft edger models do NOT come equipped for trenching . If your edger was not purchased equipped to do so , you may purchase Bevelin ( part no . 736 - 04088 ( flat washer ) and part no . 781 - 0748 ( triplex edger blade ) to utilize this feature . Edging / Trenching Position Shown Figure 5 and ground against the engine before , _ WARNING : Disconnect the spark plug wire performing the following steps . throw objects causing personal injury . , _ WARNING : Rotating cutting blade may Keep area clear of bystanders and do not leather work gloves to protect your hands , _ WARNING : The edger blade is sharp . Wear operate without guards in place . when working around the edger blade . • Working in front of the edger , loosen the flange lock Beveling nut on top of frame , allowing the idler pulley Set the bevel adjustment lever ( refer to Figure 5 ) in the assembly to pivot slightly out from the frame . See first ( left hand ) or third ( right hand ) notch to place the Figure 8 . edger blade in position for beveling . See Figure 6 . • With your other hand , carefully reach under the rear of the unit and remove the belt from around the engine flywheel pulley . See Figure 8 . Flange Lock Nut Engine Flywheel Pulley Sheaves Belt Guard Beveling Positions Figure 8 Figure 6
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• • Secure with the bell washer and the hex lock nut Remove the spindle sheaves belt guard by removing the two self - tapping screws which secure removed earlier . See Figure 11 . it to the blade plate assembly . See Figure 9 . Blade Plate Assembly Bell Washer Edg Flat Triplex Hex Lo _ ckNut Figure 11 Hex IMPORTANT : Use a torque wrench to tighten the hex Screws lock nut to between 37 foot - lbs , and 50 foot - lbs . Spindle Sheaves Belt Guard • Reinstall the spindle belt guard with the self tapping screws removed earlier . Spindle Sheaves Note : Wheel and blade styles vary by model . • Carefully place the drive belt back onto the engine flywheel pulley , and retighten the flange lock nut on Figure 9 the top of the frame . Use two wrenches ( one wrench to prevent the hex IMPORTANT : Make certain that the drive belt is seated bolt head from spinning and the other to unthread correctly on the blade spindle and that it is riding the hex lock nut ) to remove the hex lock nut and smoothly on the spindle sheaves and is not pinched bell washer that secure the edger blade , leaving the between them . Repeat the first three steps if the belt is edger blade in place . See Figure 10 . pinched . • Set the bevel adjustment lever ( refer to Figure 5 ) in the center notch to place the edger blade in a 90 ° position ( see Figure 7 ) and place the blade depth control lever in the lowest position . IMPORTANT : For best results , proceed slowly along the path being trenched , slowly moving the edger back and forth through the cutting area . NOTE : Utilizing this feature will enable you to create a wider cutting path for such things as laying wire for landscape lighting or invisible fences . EdgingAlongACurb ( modelsso equipped ) Hex Bolt Head Hex ) ck Nut Note : Wheel styles vary by model . NOTE : Edger features vary by model . All edger models do NOT come equipped to edge along a curb nor is Figure 10 there a curb wheel kit available to modify your edger if it Install the flat washer ( part no . 736 - 04088 ) and the was not purchased equipped to do so . triplex edger blade ( part no . 781 - 0748 ) that are packed separately in the box . On models so equipped , the right , rear wheel of the edger can be lowered into one of five positions to ease the task of edging along a curb . To adjust the height of the curb wheel , proceed as follows :
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• Lowertheright , rearwheelbymovingthecurb • Releasethecurbheighat djustmenletvertolock heighat djustmenletverslightlytotheleft . See thewheelinpositionS . eeFigure13 . Figure 12 . \ Curb / Height Adjustment Lever ( Normal Operating Position ) Figure 12 Curb Height Adjustment Lever • Pivot the right , rear wheel into an applicable position in relation to the height of the curb to be edged along . Figure 13 SECTION6 : MAINTAINING & SERVICINGTHEEDGER and ground against the engine before , _ WARNING : Disconnect the spark plug wire Model 550 and 551 performing any adjustment , repairs or Shown maintenance . Lubrication Engine Refer to the Engine Manual packed with your edger for a detailed description of all engine - related service specifications . Wheels Lubricate the wheels and bearings at least once a season with a light oil . Also if the wheels are removed Fitting for any reason , lubricate the surface of the axle bolt and the inner surface of the wheel with light oil . Figure 14 Pivot Points Lubricate the pivot points on the blade control bail , Replacingthe EdgerBlade blade depth control lever , and if applicable , the blade adjustment lever , and curb height adjustment lever with light oil at least once a season . leather work gloves to protect your hands , _ WARNING : The edger blade is sharp . Wear BearingBlock when working around the edger blade . On the Model 550 and551 , the bearing block is equipped with a grease fitting . Lubricate with a grease and ground against engine before gun after every 25 hours or at least once a season . On , _ WARNING : Disconnect the spark plug wire performing the following steps . the Model 521 , simply apply oil through the tiny hole in the cover plate . See Figure 14 . Working in front of the edger , loosen the flange lock nut on top of frame , allowing the idler pulley assembly to pivot slightly out from the frame . See Figure 15 . 10
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• With your other hand , carefully reach under the rear • With your other hand , carefully reach under the rear of the unit and remove the belt from around the of the unit and remove the belt from around the engine flywheel pulley . engine flywheel pulley . • Remove the spindle sheaves belt guard by • Remove the spindle sheaves belt guard by removing the two self - tapping screws which secure removing the two self - tapping screws which secure it to the blade plate assembly . See Figure 9 . it to the blade plate assembly . See Figure 9 . • Use two wrenches ( one wrench to prevent the hex • Carefully remove the belt from off of the pulleys , bolt head from spinning and the other to remove the again making sure to note the orientation of the belt . Discard the belt . hex lock nut and bell washer ) to remove the edger blade . Refer to Figure 10 . Install the replacement belt ( Part No . 754 - 04032 ) in the • Remove and discard the edger blade but retain the same configuration that the original belt was routed as bell washer and hex lock nut . follows : • Install the replacement edger blade , the bell • Working from the front of the edger , place the belt washer ( cupped side facing inward ) and the hex onto the spindle sheaves , route it back onto the two lock nut removed earlier . idler pulleys , and then place it onto the engine flywheel pulley . IMPORTANT : Use a torque wrench to tighten the hex lock nut to between 37 foot - lbs , and 50 foot - lbs . IMPORTANT : Make certain that the " V " side of the belt is seated into the top pulley and the flat side of the belt is • Reinstall the spindle belt guard with the self tapping screws removed earlier . seated into the bottom pulley . See Figure 15 . • Carefully place the drive belt back onto the engine • Reinstall the spindle sheaves belt guard with the flywheel pulley , and retighten the flange lock nut on self tapping screws removed earlier . the top of the frame . • Make certain that the drive belt is on the engine IMPORTANT : Make certain that the drive belt is seated flywheel pulley and idler pulleys , and retighten the flange lock nut on the top of the frame . correctly on the blade spindle and that it is riding smoothly on the spindle sheaves and is not pinched IMPORTANT : Make certain that the drive belt is seated between them . Repeat the first three steps if the belt is correctly and that it is riding smoothly on the spindle pinched . sheaves and is not pinched between them . Repeat the first three steps if the belt is pinched . Replacingthe DriveBelt the spindle sheaves belt guard in place . IMPORTANT : To aid in reassembly , note the orientation , _ WARNING : Never operate the edger without of the drive belt on the two idler pulleys and the engine flywheel pulley prior to performing the following steps . Refer to Figure 15 . Lock Nut Engine ' Flywheel Flat Sheaves of Belt Idler Pulle _ V " Side Belt Guard Assembly of Belt Figure 15 The edger drive belt is subject to wear and should be replaced if any signs of cracking , shredding or rotting are present . To replace the belt , proceed as follows : • Working in front of the edger , loosen the flange lock nut on top of frame , allowing the idler pulley assembly to pivot slightly out from the frame . See Figure 15 . 11
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SECTION7 : OFF - SEASOSNTORAGE Observe the following when preparing the edger for • Store the edger in a dry , clean area . Do not store long - term storage : next to any corrosive materials , such as lawn fertilizer . • Clean and lubricate unit thoroughly as instructed on • Coat the edger , especially any springs and page 10 of this manual . bearings with a light oil or silicone spray . • Refer to the Engine Manual packed separately with the edger for engine manufacturers's storage IMPORTANT : When storing any type of power instructions . equipment in an poorly ventilated or metal storage • Coat the edger blade with chassis grease to shed , care should be taken to rustproof the equipment . prevent rusting and corrosion . SECTION8 : TROUBLESHOOTING Corrective Action Trouble Possible Cause ( s ) Engine fails to start Dirty air cleaner Refer to the Engine Manual packed with your unit . Push primer bulb two or three times . Engine needs to be primed Fill tank with clean , fresh gasoline . Fuel tank empty Drain gasoline and refill tank with clean , fresh gasoline . Stale fuel in gasoline tank Move throttle lever to FAST position . Throttle control lever not in starting position Connect the spark plug wire to the spark plug . Spark plug wire disconnected . Clean , adjust gap or replace spark plug . Spark plug fouled Refer to the Engine Manual packed with your unit . Engine flooded Engine runs erratic Spark plug wire loose Connect and tighten spark plug wire . Stale fuel in gasoline tank Drain gasoline and refill tank with clean , fresh gasoline . Vent in gas cap plugged Clear vent of any debris . Drain fuel tank . Refill with fresh fuel . Water or dirt in fuel system Dirty air cleaner Refer to the Engine Manual packed with your unit . Refer to the Engine Manual packed with your unit . Carburetor out of adjustment Engine overheats Engine oil level low Fill crankcase with proper oil . Airflow restricted Clean the area around the engine's cooling fins . Dirty air filter Replace the engine's air filter Carburetor not adjusted properly Refer to the Engine Manual packed with your unit . Excessive vibration Edger blade bent or damaged Replace edger blade . Blade spindle bent or damaged Contact an authorized MTD service dealer . Drive belt slips Belt worn or stretched Replace drive belt . 12
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SECTION9 : MODEL521 / 550 / 551HANDLE 19t 15 t4 1 " \ 5 16 12 REF . PART REF . PART NO . NO . DESCRIPTION NO . NO . DESCRIPTION 1 710 - 3103 Screw , 5 / 16 - 18 12 746 - 04036 Wheel Adjustment Cable 2 710 - 0449 Screw , 5 / 16 - 18 13 746 - 04052 Control Cable ( Tecumseh ) 3 710 - 1205 Eye Bolt 746 - 04035 Control Cable ( Briggs & Stratton ) 4 710 - 3008 Screw , 5 / 16 - 18 14 747 - 0976A Bail Handle 5 710 - 0606 Screw 15 749 - 1225 Upper Handle 6 712 - 3004A Hex Lock Nut , 5 / 16 - 18 16 749 - 4044 Lower Handle 7 720 - 0279 17 781 - 0741 Wing Nut Depth Index Bracket 8 720 - 0142 Grip 18 781 - 0742 Depth Index Lever 9 720 - 0284 Wing Knob 19 720 - 0297 _ Foam Grip 10 732 - 0369 Compression Spring 20 712 - 3027 Hex Flange Nut , 1 / 4 - 20 11 736 - 0451 Saddle Washer , . 320 ID x . 93 OD l'If so equipped 13
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Model521 / 550 / 551Frame 2 lO 15 7 REF . PART NO . NO . DESCRIPTION 1 710 - 0191 Screw , 3 / 8 - 24 2 710 - 0599 Screw , 1 / 4 - 20 3 710 - 0654A Screw , 3 / 8 - 16 4 710 - 0944 Screw , 3 / 8 - 16 5 712 - 0431 Flange Lock Nut , 3 / 8 - 16 6 731 - 04168 Debris Guard 7 736 - 0320 Flat Washer , 3 / 8 ID x 1.37 OD 8 736 - 0452 Bell Washer , . 396 x 1.140 9 736 - 3052 Flat Washer , . 406 x 1.00 10 736 - 3090 Flat Washer , . 260 x . 720 11 750 - 04142 Pulley Mount Spacer 12 756 - 0313 Flat idler Pulley , 1.88 OD 13 756 - 1035A Idler Pulley 14 756 - 1150A Combination Flywheel Pulley 15 787 - 01072 Frame 14
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Model521SpindleAssembly 11 / 18 10 19 25 16 21 ! 26 23 12 14 6 V - BELTS are specially designed to engage and disengage safely . A substitute ( non - OEM ) V - Belt can be dangerous by not disengaging completely . REF . PART REF . PART NO . NO . DESCRIPTION NO . NO . DESCRIPTION 1 687 - 02019 16 736 - 0317 Bell Washer , . 63 ID x 1.20D Blade Plate Assembly 2 710 - 0395 17 736 - 3090 Hex Screw , 5 / 16 - 18 Flat Washer , . 260 x . 72 3 710 - 0599 18 738 - 04025 Self - tapping Screw , 1 / 4 - 20 Pin , 1 / 4 - 20 4 710 - 1143A 19 741 - 0524 Hex Screw , 5 / 8 - 18 Bearing , . 625 ID x 1.57 OD 5 711 - 1017 Clevis Pin 20 736 - 04088 Flat Washer 6 712 - 3004A 21 750 - 04105 Hex Lock Nut , 5 / 16 - 18 Spacer , . 63 x 1.12 x 1.06 7 712 - 3027 22 750 - 0547 Spacer , . 632 ID x . 875 OD Hex Flange Nut , 1 / 4 - 20 8 712 - 3056 23 754 - 04032 Belt Jam Nut , 5 / 8 - 18 9 714 - 0104 Cotter Pin 24 756 - 0449 Sheave 10 718 - 04012 25 781 - 0080 Blade Bearing Cup 11 731 - 04158 Blade Guard 26 781 - 0427 Belt Guard 12 731 - 04207 27 787 - 01075 Cover Plate Bearing Block 13 732 - 04169 Flat Washer 28 736 - 040881 - Compression Spring 14 736 - 0119 Lock Washer Tri Star Blade 29 781 - 07481 " 15 736 - 0187 Flat Washer l - If so equipped 15
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Model550 And551SpindleAssembly 10 / 19 2O 27 16 23 18 ! 28 25 1 / " % 11 / 14 5 V - BELTS are specially designed to engage and disengage safely . A substitute ( non - OEM ) V - Belt can be dangerous by not disengaging completely . REF . PART REF . PART NO . NO . DESCRIPTION NO . NO . DESCRIPTION 1 687 - 02019 17 736 - 3090 Fiat Washer , . 260 x . 72 Blade Plate Assembly 2 710 - 0395 18 737 - 3000 Hex Screw , 5 / 16 - 18 Lube Fitting , 3 / 16 3 710 - 0599 19 738 - 04025 Self - tapping Screw , 1 / 4 - 20 Pin , 1 / 4 - 20 4 710 - 1143A 20 741 - 0524 Hex Screw , 5 / 8 - 18 Bearing , . 625 ID x 1.57 OD 5 712 - 3004A 21 747 - 04110 Hex Lock Nut , 5 / 16 - 18 Blade Adjustment Rod 6 712 - 3027 22 736 - 04088 Spacer . 635 ID x . 88 OD Hex Flange Nut , 1 / 4 - 20 7 712 - 3056 23 750 - 04105 Jam Nut , 5 / 8 - 18 Spacer , . 63 x 1.12 x 1.06 8 714 - 3010 Cotter Pin 24 750 - 0547 Spacer , . 632 ID x . 875 OD 9 718 - 04012 25 754 - 0465 Belt Bearing Cup 10 731 - 04158 Blade Guard 26 756 - 0449 Sheave 11 731 - 04207 27 781 - 0080 Blade Bearing Block 12 732 - 04169 28 781 - 0427 Spindle Belt Guard Compression Spring 13 732 - 0188A 29 787 - 01081 Index Bracket Double Torsion Spring 14 736 - 0119 Lock Washer Flat Washer 30 736 - 04088t 15 736 - 0302 Tri Star Blade Flat Washer , . 632 ID , . 943 OD 31 781 - 07487 16 736 - 0317 Bell Washer , . 63 ID x 1.20D l - If so equipped 16
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Model521WheelAssembly 1 ( Frameshownforreferenceonly ) 6 10 % 1 REF . PART NO . NO . DESCRIPTION 1 712 - 0431 Flange Lock Nut , 3 / 8 - 16 2 732 - 04045 Torsion Spring 3 734 - 1987 Wheel 8xl . 8 4 734 - 1988 Wheel 7xl . 8 5 738 - 04037 Shoulder Screw , . 50 x 9.36 , 3 / 8 - 16 6 738 - 04038 Shoulder Screw , . 50 x 12.90 , 3 / 8 - 16 7 738 - 04039 Shoulder Screw , . 50 x 3.19 , 3 / 8 - 16 8 750 - 0289 Spacer , . 510 ID x . 875 OD 9 750 - 04129 Spacer , . 525 x . 775 10 787 - 01074 Wheel Bracket 17
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Model550 And551WheelAssembly 17 ( Frameshownfor referenceonly ) 2 7 18 \ 2 19 10 _ 9 6 < REF . PART NO . NO . DESCRIPTION 1 687 - 02022 Curb Height Adjustment Lever 2 712 - 0431 Flange Lock Nut , 3 / 8 - 16 3 732 - 04045 Torsion Spring 4 734 - 1987 Wheel 8xl . 8 5 734 - 1988 Wheel 7xl . 8 6 736 - 0182 Spring Washer , . 500 x 1.00 7 736 - 0208 Flat Washer , . 51 ID x 1.50D 8 736 - 0232 Wave Washer , . 531 ID x . 781 OD 9 736 - 0234 Washer , . 385 x 1.5 10 738 - 0213 Shoulder Screw , . 498 x 1.445 11 738 - 0380 Shoulder Screw , . 50 x . 27 12 738 - 04036 Shoulder Screw , . 50 x 4.62 13 738 - 04037 Shoulder Screw , . 50 x 9.36 , 3 / 8 - 16 14 738 - 04041 Shoulder Screw , . 50 x 11.61 15 750 - 04129 Spacer , . 525 x . 775 16 750 - 04165 Spacer , . 525 x . 775 17 750 - 0664 Spacer , . 505 ID x . 88 OD 18 781 - 0100 Curb Height Adjuster Plate 19 787 - 01074 Wheel Bracket 18
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NOTES 19
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MANUFACTURER'S LIMITED WARRANTY FOR : RD The limited warranty set forth below is given by MTD LLC d . MTD LLC does not extend any warranty for products with respect to new merchandise purchased and used in the sold or exported outside of the United States , its posses - United States , its possessions and territories . sions and territories , except those sold through MTD LLC's authorized channels of export distribution . MTD LLC warrants this product against defects for a period of e . Parts that are not genuine MTD parts are not covered by two ( 2 ) years commencing on the date of original purchase this warranty . and will , at its option , repair or replace , free of charge , any f . Service completed by someone other than an authorized part found to be defective in materials or workmanship . This service dealer is not covered by this warranty . limited warranty shall only apply if this product has been g . Transportation charges and service calls are not operated and maintained in accordance with the Operator's covered . Manual furnished with the product , and has not been subject to misuse , abuse , commercial use , neglect , accident , No implied warranty , including any implied warranty of improper maintenance , alteration , vandalism , theft , fire , merchantability of fitness for a particular purpose , water , or damage because of other peril or natural disaster . applies after the applicable period of express written Damage resulting from the installation or use of any acces - warranty above as to the parts as identified . No other sory or attachment not approved by MTD LLC for use with the express warranty , whether written or oral , except as product ( s ) covered by this manual will void your warranty as mentioned above , given by any person or entity , includ - to any resulting damage . ing a dealer or retailer , with respect to any product , shall bind MTD LLC . During the period of the warranty , the Normal wear parts or components thereof are subject to sep - exclusive remedy is repair or replacement of the product arate terms as follows : All normal wear parts or component as set forth above . failures will be covered on the product for a period of 90 days regardless of cause . After 90 days , but within the two year The provisions as set forth in this warranty provide the period , normal wear part failures will be covered ONLY IF sole and exclusive remedy arising from the sale . MTD caused by defects in materials or workmanship of OTHER LLC shall not be liable for incidental or consequential component parts . Normal wear parts and components loss or damage including , without limitation , expenses include , but are not limited to : batteries , belts , blades , blade incurred for substitute or replacement lawn care ser - adapters , grass bags , rider deck wheels , seats , snow thrower vices or for rental expenses to temporarily replace a war - skid shoes , shave plates , auger spiral rubber , tires . ranted product . HOW TO OBTAIN SERVICE : Warranty service is available , Some states do not allow the exclusion or limitation of inci - WITH PROOF OF PURCHASE , through your local autho - dental or consequential damages , or limitations on how long rized service dealer . To locate the dealer in your area , check an implied warranty lasts , so the above exclusions or limita - your Yellow Pages , or contact MTD LLC at RO . Box 361131 , tions may not apply to you . Cleveland , Ohio 44136 - 0019 , 1 - 800 - 800 - 7310 , 1 - 330 - 220 - 4683 or log on to our Web site at www . mtdproducts . com . In no event shall recovery of any kind be greater than the amount of the purchase price of the product sold . Alteration This limited warranty does not provide coverage in the follow - of safety features of the product shall void this warranty . ing cases : You assume the risk and liability for loss , damage , or injury to a . The engine or component parts thereof . These items you and your property and / or to others and their property carry a separate manufacturer's warranty . Refer to the arising out of the misuse or inability to use the product . applicable manufacturer's warranty for terms and condi - tions . This limited warranty shall not extend to anyone other than b . Log splitter pumps , valves , and cylinders have a sepa - the original purchaser or to the person for whom it was pur - rate one year warranty . chased as a gift . c . Routine maintenance items such as lubricants , filters , HOW STATE LAW RELATES TO THIS WARRANTY : This blade sharpening , tune - ups , brake adjustments , clutch limited warranty gives you specific legal rights , and you adjustments , deck adjustments , and normal deterioration may also have other rights which vary from state to of the exterior finish due to use or exposure . state . MTD LLC , P . O . BOX 361131 CLEVELAND , OHIO 44136 - 0019 1 - 800 - 800 - 7310
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