MTD 550 Series Operator's Manual
The MTD 520 Series is a versatile lawn edger designed to provide clean, precise edges to your lawn. It is powered by a reliable engine that delivers ample power for efficient edging performance. The edger features a sturdy construction with durable components, ensuring longevity and dependability. It comes equipped with safety features such as a blade guard and debris shield for added protection during operation. With its user-friendly controls and intuitive design, the MTD 520 Series makes edging your lawn a breeze.
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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 forestcovered, 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)
TABLEOFCONTENTS
Content
Important Safe Operation Practices ...................................................................
Page
3
Assembling The Edger .......................................................................................
Know The Edger .................................................................................................
5
6
Operating The Edger ..........................................................................................
Making Adjustments ...........................................................................................
Maintaining and Servicing The Edger .................................................................
Off Season Storage ............................................................................................
Troubleshooting ................................................................................................
Parts List ............................................................................................................
7
8
10
12
12
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)
P.O.
BOX 361131
CLEVELAND,OH 44136
330-220-4683 www:mtdproducts:com
800-800-731
0 F
Copy the serial number here:
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.
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.
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.
TRAINING
1.
Read, understand, and follow all instructions on the machine and in the manual(s) before attempting to assemble and operate. Keep this manual in a safe place for future and regular reference and for ordering replacement parts.
2.
Be familiar with all controls and their proper operation. Know how to stop the machine and disengage them quickly.
3.
Never allow children under 14 years old to operate this machine. Children 14 years old and over should read and understand the operation instructions and safety rules in this manual and should be trained and supervised by a parent.
4.
Never allow adults to operate this machine without proper instruction.
5.
To help avoid blade contact or a thrown object injury, keep bystanders, helpers, children and pets at least 75 feet from the machine while it is in operation. Stop machine if anyone enters the area.
PREPARATION
1.
Thoroughly inspect the area where the equipment is to be used. Remove all stones, sticks, wire, bones, toys and other foreign objects which could be tripped over or picked up and thrown by the blade. Thrown objects can cause serious personal injury.
2.
Always wear safety glasses or safety goggles during operation and while performing an adjustment or repair to protect your eyes. Thrown objects which ricochet can cause serious injury to the eyes.
3.
Wear sturdy, rough-soled work shoes and closefitting slacks and shirts. Shirts and pants that cover the arms and legs and steel-toed shoes are recommended.
Never operate this machine in bare feet, sandals, slippery or light weight (e.g. canvas) shoes.
.
.
Never attempt to make any adjustments while the engine is running, except where specifically recommended in the operator's manual.
To avoid personal injury or property damage use extreme care in handling gasoline. Gasoline is extremely flammable and the vapors are explosive.
Serious personal injury can occur when gasoline is spilled on yourself or your clothes which can ignite.
Washer your skin and change clothes immediately.
a.
Use only an approved gasoline container.
b.
Extinguish all cigarettes, cigars, pipes and other sources of ignition.
c.
Neverfuel machine indoors.
d.
Never remove gas cap or add fuel while the engine is hot or running.
e.
Allow engine to cool at least two minutes before refueling.
f.
Never over fill fuel tank. Fill tank to no more than ½ inch below bottom of filler neck to provide space for fuel expansion.
g.
Replace gasoline cap and tighten securely.
h.
If gasoline is spilled, wipe it off the engine and equipment. Move unit to another area.
Wait five minutes before starting the engine.
i.
Never store the machine or fuel container inside where there is an open flame, spark or pilot light as on a water heater, space heater, furnace,clothes dryer or other gas appliances.
j.
Allow machine to cool at least 5 minutes before storing.
OPERATION
1.
Do not put hands or feet near rotating parts.
Contact with the rotating blade can amputate hands and feet.
2.
The blade control handle is a safety device. Never bypass its operation. Doing so, makes the machine unsafe and may cause personal injury.
3.
Never operate without blade guard, debris shield and blade control handle in place and working.
Failuretodoso,canresultinpersonalinjury.
5. Neverrunanengineindoorsorina poorly resultin personal occurwhicharenotcoveredinthis manual,usecareandgoodjudgment.Contactan
800-7310.
ofalcoholor drugs.
7. Mufflerandenginebecomehotandcancausea burn.Donottouch.
8. Neveroperatethismachinewithoutgoodvisibility orlight.Alwaysbesureofyourfootingandkeepa
firmholdonthehandles.Walk,neverrun.
9. Donotoperatethismachineifithasbeendropped repair.
11.Neverattempttoclearmaterialfromtheblade
guardwhiletheengineis running.Shuttheengine
edgeattoofastofa rate.
machineongravelsurfaces.
14.Donotoperatemachineinrainorwetsoil
conditions.
15.Alwaysoperatemachinefrombehindthehandles
andpositionyourselfwherethedirectlineofsight tocuttingbladeis blockedbyguards.
16.Alwaysstopenginewhenedgingortrimmingis
delayedorwhentransporting locationtoanother.
1.
Never tamper with safety devices. Check their proper operation regularly.
2.
Before cleaning, repairing, or inspecting, disconnect the spark plug wire and ground against the engine to prevent unintended starting.
3.
Check bolts, and screws for proper tightness at frequent intervals to keep the machine in safe working condition. Also, visually inspect machine for any damage.
4.
Do not change the engine governor setting or overspeed the engine. The governor controls the maximum safe operating speed of the engine.
5.
The blade, blade guard and debris shield are subject to wear and damage. For your safety protection, frequently check all components and replace with original equipment manufacturer's
(O.E.M.) parts only. "Use of parts which do not meet the original equipment specifications may lead to improper performance and compromise safety!"
6.
Maintain or replace safety and instruction labels, as necessary.
7.
Observe proper disposal laws and regulations for gas, oil, etc. to protect the environment.
8.
Never store the machine or fuel container inside where there is an open flame, spark or pilot light such as a water heater, furnace,clothes dryer etc.
9.
Always refer to the operator's manual for proper instructions on off-season storage.
,_
WARNING: YOUR RESPONSIBILITY
the warnings and instructions in this manual and on the machine.
1
I:| !_'1 =] ::1•
Figure 1
4
IMPORTANT: This unit is shipped WITHOUT
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'sSpark Plug
• 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 lower handle.
• Depress the blade control bail at the top of the upper handle and pivot the upper handle upward until it snaps into place.
• Tighten the wing knobs which are located on both the left and right sides of the handle. See Figure 2.
Wing Knobs
Upper Handle
Upper Handle
Rope Guide
Blade Control Bail g Knob
Figure 3
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.
• Stand behind the unit and hold the blade control bail against the upper handle and gently pull the starter rope out of the engine.
Lower Handle
_
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.
• 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.
SECTION3: KNOWTHEEDGER
Blade Depth
Control Lever
(Transport Position Shown)
Pull Rope / Recoil Starter
Curb Height
Adjustment Lever\
(If Equipped)
Bevel Adjustment
Primer
NOTE: Wheel and blade styles vary by model. Yours may differ slightly.
Model 550 and 551 Shown.
Spindle Sheaves Belt Guard
,_
WARNING: Be familiar with all controls stop the machine and disengage them quickly.
NOTE: Refer to the Engine Manual packed with your
edger for a detailed description of all engine-related controls and components.
Figure 4
BladeDepthControlLever
The blade depth control lever is located on the right side of the upper handle. It is used to control the depth of the cut. The further forward the blade depth control lever is moved, the deeper into the soil the edger blade will cut. See Figure 4.
Pull Rope/ RecoilStarter
The pull rope/recoil starter is used to start the engine.
Primer
The primer is used to pump gas into the carburetor and aid in starting the engine. Use it to start a cold engine, but do not use it to restart a warm engine after a short shutdown.
NOTE:
Refer to the Engine Manual packed with your edger for a detailed description of all engine-related controls and components.
BladeControlBail
Located on the upper handle, the blade control bail 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.
The bevel adjustment lever, if so equipped, is located 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 beveled edging. See Figure 4.
Curb HeightAdjustmentLever
(if soequipped)
The curb height adjustment lever, if so equipped, is found on the rear portion of the edger.When placed in an applicable notch, it aids in stabilizing the edger while edging grass along a curb. See Figure 4.
IMPORTANT: Become familiar with all the controls before operating the edger.
The operation of any edger can result
in foreign
objects being thrown into the eyes, which can result in severe eye damage. Always wear safety glasses or eye shields. We recommend wide vision safety mask
for over spectacles or standard
safety glasses
IMPORTANT:Using the primer to restart a warm engine after a short shutdown is usually not necessary. Doing so may result in a flooded engine.
• Standing behind the unit, depress the blade control bail and hold it against the upper handle with your left hand.
,_
WARNING: Do not lower blade if blade is blade can strike the supporting surface, resulting in personal injury or property damage.
AddingGasolineAndOil
Service the engine with gasoline and oil as instructed in the Engine Manual packed with your edger. Read instructions carefully.
,_
engine running or until the engine has been allowed to cool for at least two minutes after running.
Starting The Engine
NOTE: Refer to the Engine Manual packed with your
edger for a detailed description of all engine-related controls and components.
To start the edger's engine, proceed as follows:
• Attach the spark plug wire to the spark plug. Make certain the metal cap on the end of the spark plug wire is fastened securely over the metal tip on the spark plug.
• Move the blade depth control lever back to the
START position in the adjacent (top) notch.
• Depress the primer bulb three times, pausing two to three seconds between each push. In cold weather
(below 50°F/19°C), it may be necessary to depress the primer bulb four or five times.
_
safety device. Never attempt to bypass its
WARNING: This
control mechanism is a operation.
• With your right hand, grasp the recoil starter handle and slowly pull the rope outward until engine reaches the start of its compression cycle (the rope will pull slightly harder at this point).
• After slowly allowing the rope to recoil, pull the rope with a rapid, continuous, full arm stroke. Keep a firm grip on starter handle throughout the entire stroke.
• Allow the starter handle to slowly return to the eyebolt.
NOTE: If the engine
fails to start after three pulls, depress the primer an additional two times before pulling the starter rope again.
To begin edging, proceed as follows:
• Move the blade depth control lever to the left and place it into any of the five lower notches. The further forward the blade depth control lever is moved, the deeper or lower the blade will cut into the ground.
IMPORTANT: For best results, proceed slowly along the path being edged, slowly moving the edger back and forth through the cutting area.
StoppingThe Engine
To stop the edger's engine, proceed as follows:
• Release the blade control handle.
IMPORTANT: Make certain that the engine's spark plug wire is properly grounded as instructed in SECTION 2:
Assembling The Edger before storing the edger for its next use.
SECTION5: MAKINGADJUSTMENTS
BevelAdjustment(modelssoequipped)
NOTE: Edger features vary by model. Aft edger models
do NOT come equipped for blade tilt adjustment nor is 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
Set the bevel adjustment lever (refer to Figure 5) in the center notch to place the edger blade in a 90 ° position for edging. See Figure 7.
Bevel
Adjustment
Lever
Edging/Trenching
Figure 7
Trenching(modelssoequipped)
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 part no. 736-04088 (flat washer) and part no. 781-0748
(triplex edger blade) to utilize this feature.
Bevelin(
Edging/Trenching
Position Shown
Figure 5
,_
and ground against the engine before performing the following steps.
,_
throw
objects causing personal injury.
WARNING: Rotating cutting
blade
may
Keep area clear of bystanders and do not operate without guards in place.
Beveling
Set the bevel adjustment lever (refer to Figure 5) in the first (left hand) or third (right hand) notch to place the edger blade in position for beveling. See Figure 6.
,_
leather work gloves to protect your hands when working around the edger blade.
• 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 8.
• 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
Beveling Positions
Figure 6
Engine
Flywheel Pulley
Sheaves Belt Guard
Figure 8
•
Remove the spindle sheaves belt guard by removing the two self-tapping screws which secure it to the blade plate assembly. See Figure 9.
Blade Plate
Assembly
• Secure with the bell washer and the hex lock nut removed earlier. See Figure 11.
Hex
Screws
Spindle Sheaves
Belt Guard
Spindle Sheaves
Note: Wheel and blade styles vary by model.
Figure 9
Use two wrenches (one wrench to prevent the hex bolt head from spinning and the other to unthread the hex lock nut) to remove the hex lock nut and bell washer that secure the edger blade, leaving the edger blade in place. See Figure 10.
Bell Washer
Edg
Flat
Triplex
Hex Lo_ckNut
Figure 11
IMPORTANT: Use a torque wrench to tighten the hex lock nut to between 37 foot-lbs, and 50 foot-lbs.
• Reinstall the spindle belt guard with the self tapping screws removed earlier.
• Carefully place the drive belt back onto the engine flywheel pulley, and retighten the flange lock nut on the top of the frame.
IMPORTANT: Make certain that the drive belt is seated correctly on the blade spindle and that it is riding smoothly on the spindle sheaves and is not pinched 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.
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.
Hex Bolt Head
Hex
Note:
Wheel
styles vary
by model.
)ck Nut
Figure 10
Install the flat washer (part no. 736-04088) and the triplex edger blade (part no. 781-0748) that are packed separately in the box.
equipped)
NOTE: Edger features vary by model. All edger models
do NOT come equipped to edge along a curb nor is there a curb wheel kit available to modify your edger if it was not purchased equipped to do so.
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:
• Lowertheright,rearwheelbymovingthecurb
Figure 12.
\
• Release levertolock thewheelinposition.SeeFigure13.
Curb/Height
Adjustment
Lever
(Normal Operating
Position)
Figure 12
• Pivot the right, rear wheel into an applicable position in relation to the height of the curb to be edged along.
Curb Height Adjustment Lever
Figure 13
,_
and ground against
the engine before
WARNING: Disconnect the spark plug wire
performing any adjustment, repairs or 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 for any reason, lubricate the surface of the axle bolt and the inner surface of the wheel with light oil.
Pivot Points
Lubricate the pivot points on the blade control bail, blade depth control lever, and if applicable, the blade adjustment lever, and curb height adjustment lever with light oil at least once a season.
BearingBlock
On the Model 550 and551, the bearing block is equipped with a grease fitting. Lubricate with a grease gun after every 25 hours or at least once a season. On the Model 521, simply apply oil through the tiny hole in the cover plate. See Figure 14.
Figure 14
Replacingthe EdgerBlade
,_
Model 550 and 551
Shown
Fitting
leather work gloves to protect your hands
WARNING: The edger blade is sharp. Wear
when working around the edger blade.
,_
and ground against
engine
before
WARNING:
Disconnect the spark plug wire
performing the following
steps.
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
• With your other hand, carefully reach under the rear of the unit and remove the belt from around the engine flywheel pulley.
• Remove the spindle sheaves belt guard by removing the two self-tapping screws which secure it to the blade plate assembly. See Figure 9.
• Use two wrenches (one wrench to prevent the hex bolt head from spinning and the other to remove the hex lock nut and bell washer) to remove the edger blade. Refer to Figure 10.
• Remove and discard the edger blade but retain the bell washer and hex lock nut.
• Install the replacement edger blade, the bell washer (cupped side facing inward) and the hex lock nut removed earlier.
IMPORTANT: Use a torque wrench to tighten the hex lock nut to between 37 foot-lbs, and 50 foot-lbs.
• Reinstall the spindle belt guard with the self tapping screws removed earlier.
• Carefully place the drive belt back onto the engine flywheel pulley, and retighten the flange lock nut on the top of the frame.
IMPORTANT: Make certain that the drive belt is seated correctly on the blade spindle and that it is riding smoothly on the spindle sheaves and is not pinched between them. Repeat the first three steps if the belt is pinched.
Replacingthe DriveBelt
IMPORTANT:To aid in reassembly, note the orientation 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
• With your other hand, carefully reach under the rear of the unit and remove the belt from around the engine flywheel pulley.
• Remove the spindle sheaves belt guard by removing the two self-tapping screws which secure it to the blade plate assembly. See Figure 9.
• Carefully remove the belt from off of the pulleys, again making sure to note the orientation of the belt. Discard the belt.
Install the replacement belt (Part No. 754-04032) in the same configuration that the original belt was routed as follows:
• Working from the front of the edger, place the belt onto the spindle sheaves, route it back onto the two idler pulleys, and then place it onto the engine flywheel pulley.
IMPORTANT:Make certain that the "V" side of the belt is seated into the top pulley and the flat side of the belt is seated into the bottom pulley. See Figure 15.
• Reinstall the spindle sheaves belt guard with the self tapping screws removed earlier.
• Make certain that the drive belt is on the engine flywheel pulley and idler pulleys, and retighten the flange lock nut on the top of the frame.
IMPORTANT: Make certain that the drive belt is seated correctly and that it is riding smoothly on the spindle sheaves and is not pinched between them. Repeat the first three steps if the belt is pinched.
,_
the spindle sheaves belt guard in place.
WARNING: Never operate the edger without
Engine
'
Flywheel
Flat
of Belt Idler Pulle_
Assembly
V" Side of Belt
Sheaves
Belt Guard
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
Observe the following when preparing the edger for long-term storage:
• Clean and lubricate unit thoroughly as instructed on page 10 of this manual.
• Refer to the Engine Manual packed separately with the edger for engine manufacturers's storage instructions.
• Coat the edger blade with chassis grease to prevent rusting and corrosion.
• Store the edger in a dry, clean area. Do not store next to any corrosive materials, such as lawn fertilizer.
• Coat the edger, especially any springs and bearings with a light oil or silicone spray.
IMPORTANT: When storing any type of power equipment in an poorly ventilated or metal storage shed, care should be taken to rustproof the equipment.
SECTION8: TROUBLESHOOTING
Trouble
Engine fails to start
Engine runs erratic
Engine overheats
Possible Cause(s)
Dirty air cleaner
Engine needs to be primed
Fuel tank empty
Stale fuel in gasoline tank
Throttle control lever not in starting position
Spark plug wire disconnected.
Spark plug fouled
Engine flooded
Corrective Action
Refer to the Engine Manual packed with your unit.
Push primer bulb two or three times.
Fill tank with clean, fresh gasoline.
Drain gasoline and refill tank with clean, fresh gasoline.
Move throttle lever to FAST position.
Connect the spark plug wire to the spark plug.
Clean, adjust gap or replace spark plug.
Refer to the Engine Manual packed with your unit.
Spark plug wire loose
Stale fuel in gasoline tank
Vent in gas cap plugged
Water or dirt in fuel system
Dirty air cleaner
Connect and tighten spark plug wire.
Drain gasoline and refill tank with clean, fresh gasoline.
Clear vent of any debris.
Drain fuel tank. Refill with fresh fuel.
Refer to the Engine Manual packed with your unit.
Refer to the Engine Manual packed with your unit.
Carburetor out of adjustment
Engine oil level low
Airflow restricted
Fill crankcase with proper oil.
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
Blade spindle bent or damaged
Drive belt slips Belt worn or stretched
Replace edger blade.
Contact an authorized MTD service dealer.
Replace drive belt.
12
SECTION9: MODEL521/550/551HANDLE
19t 15
5
1"
\
t4
12
16
REF.
NO.
PART
NO.
1 710-3103
2 710-0449
3 710-1205
4 710-3008
5 710-0606
6 712-3004A
7 720-0279
8 720-0142
9 720-0284
10 732-0369
11 736-0451
DESCRIPTION
Screw, 5/16-18
Screw, 5/16-18
Eye Bolt
Screw, 5/16-18
Screw
Hex Lock Nut, 5/16-18
Wing Nut
Grip
Wing Knob
Compression Spring
Saddle Washer,.320
ID x.93 OD
14
15
16
17
18
19
20
REF.
NO.
12
13
PART
NO.
746-04036
746-04052
746-04035
747-0976A
749-1225
749-4044
781-0741
781-0742
720-0297_
712-3027 l'If so equipped
DESCRIPTION
Wheel Adjustment Cable
Control Cable (Tecumseh)
Control Cable (Briggs & Stratton)
Bail Handle
Upper Handle
Lower Handle
Depth Index Bracket
Depth Index Lever
Foam Grip
Hex Flange Nut, 1/4-20
13
Model521/550/551Frame
15
2 lO
7
11
12
13
14
15
7
8
9
10
REF.
NO.
1
2
5
6
3
4
PART
NO.
710-0191
710-0599
710-0654A
710-0944
712-0431
731-04168
736-0320
736-0452
736-3052
736-3090
750-04142
756-0313
756-1035A
756-1150A
787-01072
DESCRIPTION
Screw, 3/8-24
Screw, 1/4-20
Screw, 3/8-16
Screw, 3/8-16
Flange Lock Nut, 3/8-16
Debris Guard
Flat Washer, 3/8 ID x 1.37 OD
Bell Washer,.396
Flat Washer,.406
x 1.140
x 1.00
Flat Washer,.260
x.720
Pulley Mount Spacer
Flat idler Pulley, 1.88 OD
Idler Pulley
Combination
Frame
Flywheel Pulley
14
Model521SpindleAssembly
25
16
/
11
18
10
19
21
23
26
!
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.
11
12
13
14
15
7
8
9
10
5
6
3
4
REF.
NO.
1
2
PART
NO.
687-02019
710-0395
710-0599
710-1143A
711-1017
712-3004A
712-3027
712-3056
714-0104
718-04012
731-04158
731-04207
732-04169
736-0119
736-0187
DESCRIPTION
Blade Plate Assembly
Hex Screw, 5/16-18
Self-tapping Screw, 1/4-20
Hex Screw, 5/8-18
Clevis Pin
Hex Lock Nut, 5/16-18
Hex Flange Nut, 1/4-20
Jam Nut, 5/8-18
Cotter Pin
Bearing Cup
Blade Guard
Bearing Block
Compression
Lock Washer
Flat Washer
Spring
15
REF.
NO.
PART
NO.
16 736-0317
17 736-3090
18 738-04025
19 741-0524
20 736-04088
21 750-04105
22 750-0547
23 754-04032
24 756-0449
25 781-0080
26 781-0427
27 787-01075
28 736-040881-
29 781-07481"
DESCRIPTION
Bell Washer,.63
Flat Washer,.260
Pin, 1/4-20
Bearing,.625
Flat Washer
ID x 1.20D
x.72
ID x 1.57 OD
Spacer,.63
Spacer,.632
Belt
Sheave
Blade
Belt Guard
Cover Plate
Flat Washer
Tri Star Blade x 1.12 x 1.06
ID x.875
OD l-If so equipped
Model550 And551SpindleAssembly
/
10
19
2O
27
16
18
23
25
28
!
1/ "%
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.
11
12
13
14
7
8
9
10
15
16
5
6
3
4
REF.
NO.
1
2
PART
NO.
687-02019
710-0395
710-0599
710-1143A
712-3004A
712-3027
712-3056
714-3010
718-04012
731-04158
731-04207
732-04169
732-0188A
736-0119
736-0302
736-0317
DESCRIPTION
Blade Plate Assembly
Hex Screw, 5/16-18
Self-tapping Screw, 1/4-20
Hex Screw, 5/8-18
Hex Lock Nut, 5/16-18
Hex Flange Nut, 1/4-20
Jam Nut, 5/8-18
Cotter Pin
Bearing Cup
Blade Guard
Bearing Block
Compression Spring
Double Torsion Spring
Lock Washer
Flat Washer,.632
ID,.943 OD
Bell Washer,.63 ID x 1.20D
16
27
28
29
23
24
25
26
REF.
NO.
PART
NO.
17 736-3090
18 737-3000
19 738-04025
20 741-0524
21 747-04110
22 736-04088
750-04105
750-0547
754-0465
756-0449
781-0080
781-0427
787-01081
30
31
736-04088t
781-07487
DESCRIPTION
Fiat Washer,.260
Lube Fitting, 3/16
Pin, 1/4-20 x.72
Bearing,.625
ID x 1.57 OD
Blade Adjustment Rod
Spacer.635
Spacer,.63
ID x.88 OD x 1.12 x 1.06
ID x.875
OD Spacer,.632
Belt
Sheave
Blade
Spindle Belt Guard
Index Bracket
Flat Washer
Tri Star Blade l-If so equipped
Model521WheelAssembly
(Frameshownforreferenceonly)
6
%
1
10
1
REF.
NO.
1
2
5
6
3
4
7
8
9
10
PART
NO.
712-0431
732-04045
734-1987
734-1988
738-04037
738-04038
738-04039
750-0289
750-04129
787-01074
DESCRIPTION
Flange Lock Nut, 3/8-16
Torsion Spring
Wheel 8xl .8
Wheel 7xl .8
Shoulder Screw,.50
x 9.36, 3/8-16
Shoulder Screw,.50
x 12.90, 3/8-16
Shoulder Screw,.50
x 3.19, 3/8-16
Spacer,.510
ID x.875
OD
Spacer,.525
Wheel Bracket x.775
17
Model550 And551WheelAssembly
10_
\
(Frameshownfor referenceonly)
18
7
2
17
6
<
9
PART
NO.
687-02022
712-0431
732-04045
734-1987
734-1988
736-0182
736-0208
736-0232
736-0234
738-0213
738-0380
738-04036
738-04037
738-04041
750-04129
750-04165
750-0664
781-0100
787-01074
10
11
12
13
8
9
6
7
REF.
NO.
1
4
5
2
3
14
15
16
17
18
19
DESCRIPTION
Curb Height Adjustment Lever
Flange Lock Nut, 3/8-16
Torsion Spring
Wheel 8xl .8
Wheel 7xl .8
Spring Washer,.500
Flat Washer,.51
x 1.00
ID x 1.50D
Wave Washer,.531
ID x.781
OD
Washer,.385
x 1.5
Shoulder Screw,.498
x 1.445
Shoulder Screw,.50
x.27
Shoulder Screw,.50
x 4.62
Shoulder Screw,.50
x 9.36, 3/8-16
Shoulder Screw,.50
x 11.61
Spacer,.525
x.775
Spacer,.525
x.775
Spacer,.505
ID x.88 OD
Curb Height Adjuster Plate
Wheel Bracket
18
19
2
NOTES
19
MANUFACTURER'S LIMITED WARRANTY FOR:
The limited warranty set forth below is given by MTD LLC with respect to new merchandise
United States, its possessions purchased and territories.
and used in the
MTD LLC warrants this product against defects for a period of two (2) years commencing on the date of original purchase and will, at its option, repair or replace, free of charge, any part found to be defective in materials or workmanship.
This limited warranty shall only apply if this product has been operated and maintained in accordance with the Operator's
Manual furnished with the product, and has not been subject to misuse, abuse, commercial improper maintenance, use, alteration, neglect, vandalism, accident, theft, fire, water, or damage because of other peril or natural disaster.
Damage resulting from the installation or use of any accessory or attachment not approved by MTD LLC for use with the product(s) covered by this manual will void your warranty as to any resulting damage.
Normal wear parts or components thereof are subject to separate terms as follows: All normal wear parts or component failures will be covered on the product for a period of 90 days regardless of cause.
After 90 days, but within the two year period, normal wear part failures will be covered ONLY IF caused by defects in materials or workmanship component parts.
Normal wear parts of OTHER and components include, but are not limited to: batteries, belts, blades, blade adapters, grass bags, rider deck wheels, seats, snow thrower skid shoes, shave plates, auger spiral rubber, tires.
HOW TO OBTAIN SERVICE: Warranty service is available,
WITH PROOF OF PURCHASE, through your local authorized service dealer.
To locate the dealer in your area, check your Yellow Pages, or contact MTD LLC at RO. Box 361131,
Cleveland, Ohio 44136-0019, 1-800-800-7310, 1-330-220-
4683 or log on to our Web site at www.mtdproducts.com.
This limited warranty does not provide coverage in the following cases: a.
The engine or component parts thereof.
These items carry a separate manufacturer's applicable tions.
manufacturer's warranty warranty.
Refer to the for terms and condib.
c.
Log splitter pumps, valves, and cylinders have a separate one year warranty.
Routine maintenance items such as lubricants, filters, blade sharpening, adjustments, tune-ups, deck adjustments, brake adjustments, and normal clutch deterioration of the exterior finish due to use or exposure.
MTD LLC, P.O. BOX 361131 CLEVELAND, d.
e.
f.
g.
RD
MTD LLC does not extend any warranty for products sold or exported outside of the United States, its possessions and territories, except those sold through MTD
LLC's authorized channels of export distribution.
Parts that are not genuine MTD parts are not covered by this warranty.
Service completed by someone other than an authorized service dealer is not covered by this warranty.
Transportation covered.
charges and service calls are not
No implied
warranty,
including any implied
warranty of
merchantability of fitness for a particular purpose, applies after the applicable warranty above as to the period parts of express as identified.
written
No other express warranty, whether written or oral, except as mentioned above, given by any person or entity, including a dealer or retailer, with respect to any
product,
shall bind
MTD
LLC.
During the period of the warranty, exclusive remedy as set forth above.
is repair or replacement the of the product
The provisions as set forth in this warranty provide the sole and exclusive remedy arising from the sale.
MTD
LLC shall not be liable for incidental or consequential loss or damage including, without limitation, expenses incurred for substitute or replacement vices or for rental expenses to temporarily lawn care serreplace a warranted product.
Some states do not allow the exclusion or limitation of incidental or consequential damages, or limitations on how long an implied warranty lasts, so the above exclusions or limitations may not apply to you.
In no event shall recovery of any kind be greater than the amount of the purchase price of the product sold. Alteration of safety features of the product shall void this warranty.
You assume the risk and liability for loss, damage, or injury to you and your property and/or to others and their property arising out of the misuse or inability to use the product.
This limited warranty shall not extend to anyone other than the original purchaser or to the person for whom it was purchased as a gift.
HOW
STATE
LAW RELATES
TO THIS WARRANTY:
This limited warranty gives
you specific
legal
rights, and you may also have other rights which vary from state to state.
OHIO 44136-0019 1-800-800-7310
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