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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 44136 - 0019 . MTD LLC , P.O . BOX 361131 CLEVELAND , OHIO 44136 - 0019 PRINTED IN U.S.A . 769 - 00527 . fm FORM NO . ( 12 / 02 )
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TABLE OF CONTENTS 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 FINDING MODEL NUMBER 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 ) MTD LLC Copy the serial number here : P . O . BOX 361131 CLEVELAND , OH 44136 1330 - 220 - 46830 www.mtdproducts.com 800 - 800 - 73 ENGINE INFORMATION 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 . CALLING CUSTOMER SUPPORT 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 . Call 1 - ( 330 ) 220 - 4MTD ( 4683 ) or 1 - ( 800 ) - 800 - 7310 to reach a Customer Support representative . Please have your unit’s model number and serial number ready when you call . See previous section to locate this information . You will be asked to enter the serial number in order to process your call . For more details about your unit , visit our website at www.mtdproducts.com 2
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SECTION 1 : IMPORTANT SAFE OPERATION PRACTICES 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 . 4 . 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 5 . 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 . Never fuel 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 objects which ricochet can cause serious injury to OPERATION 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 . 3
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18 . Only use parts and accessories made for this 4 . Never operate with damaged safety devices . machine by the manufacturer . Failure to do so , can Failure to do so , can result in personal injury . result in personal injury . 5 . Never run an engine indoors or in a poorly 19 . If situations occur which are not covered in this ventilated area . Engine exhaust contains carbon manual , use care and good judgment . Contact an monoxide , an odorless and deadly gas . authorized MTD service dealer or telephone 1 - 800 - 6 . Do not operate machine while under the influence 800 - 7310 . of alcohol or drugs . 7 . Muffler and engine become hot and can cause a burn . Do not touch . MAINTENANCE AND STORAGE 8 . Never operate this machine without good visibility 1 . Never tamper with safety devices . Check their or light . Always be sure of your footing and keep a proper operation regularly . firm hold on the handles . Walk , never run . 2 . Before cleaning , repairing , or inspecting , 9 . Do not operate this machine if it has been dropped disconnect the spark plug wire and ground against or damaged . Return machine to your nearest the engine to prevent unintended starting . authorized servicing dealer for examination and 3 . Check bolts , and screws for proper tightness at repair . frequent intervals to keep the machine in safe 10 . Do not operate this machine with a damaged or working condition . Also , visually inspect machine excessively worn cutting blade . for any damage . 11 . Never attempt to clear material from the blade 4 . Do not change the engine governor setting or over - guard while the engine is running . Shut the engine speed the engine . The governor controls the off , disconnect the spark plug wire and ground maximum safe operating speed of the engine . against the engine to prevent unintended starting . 5 . The blade , blade guard and debris shield are 12 . Do not overload machine capacity by attempting to subject to wear and damage . For your safety edge at too fast of a rate . protection , frequently check all components and 13 . Stay alert for uneven sidewalks , terrain etc . Always replace with original equipment manufacturer’s push slowly over rough surfaces . Do not use this ( O.E.M . ) parts only . “ Use of parts which do not machine on gravel surfaces . meet the original equipment specifications may 14 . Do not operate machine in rain or wet soil lead to improper performance and compromise conditions . safety ! ” 15 . Always operate machine from behind the handles 6 . Maintain or replace safety and instruction labels , as and position yourself where the direct line of sight necessary . to cutting blade is blocked by guards . 7 . Observe proper disposal laws and regulations for 16 . Always stop engine when edging or trimming is gas , oil , etc . to protect the environment . delayed or when transporting machine from one 8 . Never store the machine or fuel container inside location to another . where there is an open flame , spark or pilot light 17 . Never leave a running machine unattended . Stop such as a water heater , furnace , clothes dryer etc . the engine , disconnect spark plug wire and ground 9 . Always refer to the operator’s manual for proper against the engine to prevent unintended starting . instructions on off - season storage . WARNING : YOUR RESPONSIBILITY Restrict the use of this power machine to persons who read , understand and follow the warnings and instructions in this manual and on the machine . KEEP AWAY — ROTATING BLADE Figure 1 4
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SECTION 2 : ASSEMBLING YOUR EDGER 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 . Grounding the Engine’s Spark Plug Blade Control Bail • Disconnect the spark plug wire from the spark plug and ground against the engine . Positioning the Edger Handles • Remove and discard any packaging cardboard that may be present between the upper handle and the Rope Guide lower handle . Wing 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 Upper Handle • Stand behind the unit and hold the blade control bail against the upper handle and gently pull the starter rope out of the engine . WARNING : The edger blade WILL rotate when the starter rope is pulled . 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 Attaching the Starter Rope • 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 . 5
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SECTION 3 : KNOW THE EDGER Blade Control Bail Blade Depth Control Lever ( Transport Position Shown ) Pull Rope / Recoil Starter Curb Height Adjustment Lever ( If Equipped ) Bevel Adjustment Lever ( If Equipped ) Primer Spindle Belt Guard NOTE : Wheel and blade styles vary by model . Yours may differ slightly . Model 550 and 551 Shown . Figure 4 WARNING : Be familiar with all controls Blade Depth Control Lever and their proper operation . Know how to 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 . Bevel Adjustment Lever ( if so equipped ) Pull Rope / Recoil Starter 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 between one of three positions for edging / trenching or Primer 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 , Curb Height Adjustment Lever but do not use it to restart a warm engine after a short shutdown . ( if so equipped ) 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 . Blade Control Bail 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 . 6
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SECTION 4 : OPERATING THE EDGER The operation of any edger can result IMPORTANT : Using the primer to restart a warm engine WEAR YOUR SAFETY GLASSES 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 FORESIGHT IS BETTER THAN NO SIGHT 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 WARNING : This control mechanism is a safety glasses safety device . Never attempt to bypass its WARNING : Do not lower blade if blade is operation . over concrete , asphalt , rocks or the like . The • 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 Adding Gasoline And Oil 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 . WARNING : Never fill fuel tank indoors , with 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 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 Starting The Engine place it into any of the five lower notches . The further forward the blade depth control lever is NOTE : Refer to the Engine Manual packed with your moved , the deeper or lower the blade will cut into edger for a detailed description of all engine - related the ground . controls and components . 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 Stopping The 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 . 7
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SECTION 5 : MAKING ADJUSTMENTS Bevel Adjustment ( models so equipped ) Edging Set the bevel adjustment lever ( refer to Figure 5 ) in the NOTE : Edger features vary by model . All 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 Position Figure 7 Bevel Adjustment Trenching ( models so equipped ) Lever NOTE : Edger features vary by model . All edger models do NOT come equipped for trenching . If your edger was not purchased equipped to do so , you may purchase Beveling part no . 736 - 0366 ( flat washer ) and part no . 781 - 0748 ( triplex edger blade ) to utilize this feature . Edging / Trenching Position Shown WARNING : Disconnect the spark plug wire Figure 5 and ground against the engine before performing the following steps . WARNING : Rotating cutting blade may throw objects causing personal injury . WARNING : The edger blade is sharp . Wear Keep area clear of bystanders and do not leather work gloves to protect your hands operate without guards in place . when working around the edger blade . • Working in front of the edger , with the rear wheels Beveling backed up to a curb or the unit tilted back to keep it Set the bevel adjustment lever ( refer to Figure 5 ) in the from rolling backwards , grasp the spindle belt guard first ( left hand ) or third ( right hand ) notch to place the with one hand and push towards the rear of the unit edger blade in position for beveling . See Figure 6 . to compress the spring and relieve the tension on the drive belt . • If it hasn’t already freed itself , 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 . Beveling Positions Engine Spindle Figure 6 Flywheel Pulley Belt Guard Figure 8 8
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• Secure with the bell washer and the hex lock nut • Remove the spindle belt guard by removing the two self tapping screws which secure it to the blade removed earlier . See Figure 11 . plate assembly . See Figure 9 . Blade Plate Assembly Bell Washer Edger Blade Flat Washer Triplex Blade Hex Lock Nut 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 Belt Guard • Reinstall the spindle belt guard with the self tapping screws removed earlier . Spindle Sheaves Note : Wheel and blade styles vary by model . • Grasp the spindle belt guard with one hand and push towards the rear of the unit to compress the Figure 9 spring , and with your other hand carefully place the • Use two wrenches ( one wrench to prevent the hex drive belt back onto the engine flywheel pulley . bolt head from spinning and the other to unthread IMPORTANT : Make certain that the drive belt is seated the hex lock nut ) to remove the hex lock nut and correctly on the blade spindle and that it is riding bell washer that secure the edger blade , leaving the smoothly on the spindle sheaves and is not pinched edger blade in place . See Figure 10 . between them . Repeat the first three steps if the belt is 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 . Edging Along A Curb ( models so equipped ) Bell Washer NOTE : Edger features vary by model . All edger models Hex Lock Nut do NOT come equipped to edge along a curb nor is Hex Bolt Head there a curb wheel kit available to modify your edger if it Note : Wheel styles vary by model . was not purchased equipped to do so . Figure 10 On models so equipped , the right , rear wheel of the • Install the flat washer ( part no . 736 - 0366 ) and the edger can be lowered into one of five positions to ease triplex edger blade ( part no . 781 - 0748 ) that are the task of edging along a curb . packed separately in the box . To adjust the height of the curb wheel , proceed as follows : 9
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• Lower the right , rear wheel by moving the curb • Release the curb height adjustment lever to lock height adjustment lever slightly to the left . See the wheel in position . See Figure 13 . Figure 12 . Curb Height Adjustment ( Lowered Position ) 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 SECTION 6 : MAINTAINING & SERVICING THE EDGER WARNING : Disconnect the spark plug wire and ground against the engine before 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 Lube 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 , Replacing the Edger Blade blade depth control lever , and if applicable , the blade adjustment lever , and curb height adjustment lever with WARNING : The edger blade is sharp . Wear light oil at least once a season . leather work gloves to protect your hands Bearing Block when working around the edger blade . On the Model 550 and551 , the bearing block is WARNING : Disconnect the spark plug wire 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 performing the following steps . the Model 521 , simply apply oil through the tiny hole in the cover plate . See Figure 14 . 10
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The edger drive belt is subject to wear and should be • Working in front of the edger , with the rear wheels replaced if any signs of cracking , shredding or rotting backed up to a curb or the unit tilted back to keep it are present . To replace the belt , proceed as follows : from rolling backwards , grasp the spindle belt guard with one hand and push towards the rear of the unit • Working in front of the edger , grasp the spindle belt to compress the spring and relieve the tension on guard with one hand and push towards the rear of the drive belt . the unit to compress the spring and relieve the • If it hasn’t already freed itself , with your other hand , tension on the drive belt . carefully reach under the rear of the unit and • If it hasn’t already freed itself , with your other hand , remove the belt from around the engine flywheel carefully reach under the rear of the unit and pulley . remove the belt from around the engine flywheel • Remove the spindle belt guard by removing the two pulley . self tapping screws which secure it to the blade • Remove the spindle belt guard by removing the two plate assembly . Refer to Figure 9 . self - tapping screws which secure it to the blade • Use two wrenches ( one wrench to prevent the hex plate assembly . See Figure 9 . bolt head from spinning and the other to remove the • Carefully remove the belt from off of the two idler hex lock nut and bell washer ) to remove the edger pulleys and the blade spindle , again making sure to blade . Refer to Figure 10 . note the orientation of the belt . Discard the belt . • Remove and discard the edger blade but retain the Install the replacement belt ( Part No . 754 - 0465 ) in the bell washer and hex lock nut . same configuration that the original belt was routed as • Install the replacement edger blade , the bell follows : washer ( cupped side facing inward ) and the hex • Working from the front of the edger , place the belt lock nut removed earlier . onto the blade spindle and then route it back onto IMPORTANT : Use a torque wrench to tighten the hex the two idler pulleys . lock nut to between 37 foot - lbs . and 50 foot - lbs . IMPORTANT:Make certain that the “ V ” side of the belt is • Reinstall the spindle belt guard with the self tapping seated into the top pulley and the flat side of the belt is screws removed earlier . seated into the bottom pulley . See Figure 15 . • Grasp the spindle belt guard with one hand and • Reinstall the spindle belt guard with the self tapping push towards the rear of the unit to compress the screws removed earlier . spring , and with your other hand carefully place the • Grasp the spindle belt guard with one hand and drive belt back onto the engine flywheel pulley . push towards the rear of the unit to compress the IMPORTANT : Make certain that the drive belt is seated spring , and with your other hand carefully place the correctly on the blade spindle and that it is riding drive belt back onto the engine flywheel pulley . 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 on the blade spindle and that it is riding pinched . smoothly on the spindle sheaves and is not pinched between them . Repeat the first three steps if the belt is Replacing the Drive Belt pinched . 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 the spindle belt guard in place . pulley prior to performing the following steps . Refer to Figure 15 . Flat Side “ V ” Side Spindle Belt of Belt of Belt Guard Figure 15 11
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SECTION 7 : OFF - SEASON STORAGE • Store the edger in a dry , clean area . Do not store Observe the following when preparing the edger for next to any corrosive materials , such as lawn long - term storage : 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 . SECTION 8 : TROUBLESHOOTING Trouble Possible Cause ( s ) Corrective Action Refer to the Engine Manual packed with your unit . Engine fails to start Dirty air cleaner Push primer bulb two or three times . Fill tank with clean , fresh gasoline . Engine needs to be primed Drain gasoline and refill tank with clean , fresh gasoline . Fuel tank empty Move throttle lever to FAST position . Stale fuel in gasoline tank Throttle control lever not in Connect the spark plug wire to the spark plug . starting position Clean , adjust gap or replace spark plug . Spark plug wire disconnected . Refer to the Engine Manual packed with your unit . Spark plug fouled Engine flooded Connect and tighten spark plug wire . Engine runs erratic Spark plug wire loose Drain gasoline and refill tank with clean , fresh gasoline . Stale fuel in gasoline tank Clear vent of any debris . Vent in gas cap plugged Drain fuel tank . Refill with fresh fuel . Water or dirt in fuel system Refer to the Engine Manual packed with your unit . Dirty air cleaner Refer to the Engine Manual packed with your unit . Carburetor out of adjustment Fill crankcase with proper oil . Engine overheats Engine oil level low Clean the area around the engine’s cooling fins . Air flow restricted Replace the engine’s air filter Dirty air filter Refer to the Engine Manual packed with your unit . Carburetor not adjusted properly 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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SECTION 9 : MODEL 521 / 550 / 551 HANDLE 19 † 15 8 7 14 11 18 6 5 1 17 13 7 10 3 16 12 2 9 11 6 4 REF . PART REF . PART NO . NO . DESCRIPTION NO . NO . DESCRIPTION 1 710 - 0116 Screw , 5 / 16 - 18 11 736 - 0451 Saddle Washer , . 320 ID x . 93 OD 2 710 - 0449 Screw , 5 / 16 - 18 12 746 - 04036 Wheel Adjustment Cable 3 710 - 1205 Eye Bolt 13 746 - 04052 Control Cable ( Tecumseh ) 4 710 - 3008 Screw , 5 / 16 - 18 746 - 04035 Control Cable ( Briggs & Stratton ) 5 710 - 0606 Screw 14 747 - 0976A Bail Handle 6 712 - 3004A Hex Lock Nut , 5 / 16 - 18 15 749 - 1225 Upper Handle 7 720 - 0279 Wing Nut 16 749 - 4044 Lower Handle 8 720 - 0142 Grip 17 781 - 0741 Depth Index Bracket 9 720 - 0284 Wing Knob 18 781 - 0742 Depth Index Lever 10 732 - 0369 Compression Spring 19 720 - 0297 † Foam Grip † If so equipped 13
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Model 521 / 550 / 551 Frame 2 10 5 6 9 3 15 11 13 14 12 7 8 4 1 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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Model 521 Spindle Assembly 28 † 11 7 17 8 18 16 29 † 10 19 25 16 21 17 20 9 1 3 27 15 7 17 24 22 2 26 23 4 13 5 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 16 736 - 0317 Bell Washer , . 63 ID x 1.2 OD 1 687 - 02019 Blade Plate Assembly 17 736 - 3090 Flat Washer , . 260 x . 72 2 710 - 0395 Hex Screw , 5 / 16 - 18 18 738 - 04025 Pin , 1 / 4 - 20 3 710 - 0599 Self - tapping Screw , 1 / 4 - 20 19 741 - 0524 Bearing , . 625 ID x 1.57 OD 4 710 - 1143A Hex Screw , 5 / 8 - 18 20 736 - 04088 Flat Washer 5 711 - 1017 Clevis Pin 21 750 - 04105 Spacer , . 63 x 1.12 x 1.06 6 712 - 3004A Hex Lock Nut , 5 / 16 - 18 22 750 - 0547 Spacer , . 632 ID x . 875 OD 7 712 - 3027 Hex Flange Nut , 1 / 4 - 20 23 754 - 0465 Belt 8 712 - 3056 Jam Nut , 5 / 8 - 18 24 756 - 0449 Sheave 9 714 - 0104 Cotter Pin 25 781 - 0080 Blade 10 718 - 04012 Bearing Cup 26 781 - 0427 Belt Guard 11 731 - 04158 Blade Guard 27 787 - 01075 Cover Plate 12 731 - 04207 Bearing Block 28 736 - 04088 † Flat Washer 13 732 - 0187 Compression Spring 29 781 - 0748 † Tri Star Blade 14 736 - 0119 Lock Washer 15 736 - 0187 Flat Washer † If so equipped 15
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Model 550 And 551 Spindle Assembly 30 † 10 6 17 7 19 16 31 † 9 20 27 16 23 17 22 1 18 3 29 8 15 6 26 2 24 28 21 25 4 12 13 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 17 736 - 3090 Flat Washer , . 260 x . 72 1 687 - 02019 Blade Plate Assembly 18 737 - 3000 Lube Fitting , 3 / 16 2 710 - 0395 Hex Screw , 5 / 16 - 18 19 738 - 04025 Pin , 1 / 4 - 20 3 710 - 0599 Self - tapping Screw , 1 / 4 - 20 20 741 - 0524 Bearing , . 625 ID x 1.57 OD 4 710 - 1143A Hex Screw , 5 / 8 - 18 21 747 - 04110 Blade Adjustment Rod 5 712 - 3004A Hex Lock Nut , 5 / 16 - 18 22 736 - 04088 Spacer . 635 ID x . 88 OD 6 712 - 3027 Hex Flange Nut , 1 / 4 - 20 23 750 - 04105 Spacer , . 63 x 1.12 x 1.06 7 712 - 3056 Jam Nut , 5 / 8 - 18 24 750 - 0547 Spacer , . 632 ID x . 875 OD 8 714 - 3010 Cotter Pin 25 754 - 0465 Belt 9 718 - 04012 Bearing Cup 26 756 - 0449 Sheave 10 731 - 04158 Blade Guard 27 781 - 0080 Blade 11 731 - 04207 Bearing Block 28 781 - 0427 Spindle Belt Guard 12 732 - 0187 Compression Spring 29 787 - 01081 Index Bracket 13 732 - 0188A Double Torsion Spring 30 736 - 04088 † Flat Washer 14 736 - 0119 Lock Washer 31 781 - 0748 † Tri Star Blade 15 736 - 0302 Flat Washer , . 632 ID , . 943 OD 16 736 - 0317 Bell Washer , . 63 ID x 1.2 OD † If so equipped 16
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Model 521 Wheel Assembly 3 1 8 ( Frame shown for reference only ) 6 8 9 10 3 1 1 1 8 2 7 5 4 REF . PART NO . NO . DESCRIPTION 1 712 - 0431 Flange Lock Nut , 3 / 8 - 16 2 732 - 04045 Torsion Spring 3 734 - 1987 Wheel 8x1.8 4 734 - 1988 Wheel 7x1.8 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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Model 550 And 551 Wheel Assembly 2 8 17 ( Frame shown for reference only ) 4 2 7 4 18 2 15 8 19 5 2 10 1 9 8 11 6 3 14 12 13 16 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 8x1.8 5 734 - 1988 Wheel 7x1.8 6 736 - 0182 Spring Washer , . 500 x 1.00 7 736 - 0208 Flat Washer , . 51 ID x 1.5 OD 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 : d . MTD LLC does not extend any warranty for products The limited warranty set forth below is given by MTD LLC sold or exported outside of the United States , its posses - with respect to new merchandise purchased and used in the sions and territories , except those sold through MTD United States , its possessions and territories . 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 P.O . 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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