MTD Series 410 User manual

Rear Tine Tiller
Model Series
410 Thru 420
Operator’s Manual
Model Series 410 Shown
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019
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.
PRINTED IN U.S.A.
FORM NO.
770-10136C.fm
(11/02)

2
TABLE OF CONTENTS
Content Page
Important Safe Operation Practices...................................................................3
Assembling Your Tiller.......................................................................................5
Know Your Tiller.................................................................................................8
Operating Your Tiller..........................................................................................9
Making Adjustments ..........................................................................................10
Maintaining Your Tiller.......................................................................................11
Troubleshooting.................................................................................................13
Parts List............................................................................................................14
FINDING MODEL NUMBER
This Operator’s Manual is an important part of your new Tiller. 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 our Customer Support Department or
an authorized dealer.
• You can locate the model number by standing in the operating position behind the unit and looking
down at the center of the rear tine cover. 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.
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.
CONTACTING CUSTOMER SUPPORT
If you have difficulty assembling this product or have any questions regarding the controls, operation or
maintenance of this unit, please call 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.
Copy the model number here:
Copy the serial number here:
For more details about your unit, visit our website at www.mtdproducts.com

3
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: Engine Exhaust, some of its constituents, and certain vehicle
components contain or emit chemicals known to State of California to cause cancer
and 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. This machine is capable of amputating hands and feet and throwing objects.
Failure to observe the following safety instructions could result in serious injury or death.
Training
1. Read, understand, and follow allinstructions on the
machine and in the manual(s) before attempting to
assemble and operate. Keepthis manual ina safe
place for future andregular reference and for
ordering replacement parts.
2. Be familiar with all controls and theirproper
operation. Know how to stop themachine 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 operationinstructions 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. Keepbystanders,helpers, petsandchildren atleast
75 feet from the machine while it is in operation.
Stop machine ifanyone enters the area.
Preparation
1. Thoroughlyinspectthe area wheretheequipmentis
to be used. Remove all stones, sticks, wire, and
other foreign objects which could be tripped over
and cause personal injury.
2. Wear sturdy, rough-soled work shoes and close
fitting slacks and shirt. Loose fitting clothes or
jewelry can be caught in movable parts. Never
operate this machinein bare feet or sandals.
3. Disengage clutch levers and shift (if provided) into
neutral (“N”) before starting the engine.
4. Never leave this machineunattended with the
engine running.
5. Never attempt to make any adjustments while
engine is running, except where specifically
recommended in the operator’s manual.
6. To avoid personal injury or property damage use
extreme care inhandling gasoline. Gasoline is
extremely flammable and thevapors are explosive.
Serious personal injury can occur when gasoline is
spilled on yourselfor your clothes which can ignite.
Wash your skin and change clothes immediately.
7. Use only an approved gasoline container.
8. Extinguish all cigarettes, cigars, pipes and other
sources of ignition.
9. Never fuel machine indoors.
10. Never remove gas cap or addfuel while the engine
is hot or running.
11. Allow engine to cool at least two minutes before
refueling.
12. Never over fill fuel tank. Fill tank to no more than ½
inch below bottom of filler neck to provide space for
fuel expansion.
13. Replace gasoline cap and tighten securely.
14. If gasoline is spilled, wipe it off the engine and
equipment. Move machine to another area. Wait 5
minutes before starting the engine.
15. Never store the machine or fuel container inside
near an open flame, spark or pilot light (e.g.
furnace, water or space heater, clothes dryer etc.).
16. Allow machine tocool 5 minutes before storing.
Operation
1. Do notputhandsorfeetnearrotatingparts. Contact
with the rotating parts can amputate hands and feet.
2. Do not operate machine while under the influence
of alcohol or drugs.
3. Never operate this machinewithout good visibility
or light. Always be sure of your footing and keep a
firm hold on the handles.
4. Keep bystanders, helpers,pets, and children at
least 75 feet from the machine while itis in
operation. Stop the machine if anyone enters the
area.
5. Be careful when tilling in hard ground. The tines
may catch in the ground and propel the tiller
forward. If this occurs, let go of the handle bars and
do not restrain the machine.
6. Exercise extreme caution when operating on or
crossing gravel surfaces. Stay alert for hidden
hazards or traffic. Do not carry passengers.

4
7. Never operate the machine at high transport
speeds on hard or slippery surfaces.
8. Exercise caution to avoid slipping or falling.
9. Look down and behind and use care when in
reverse or pulling machine towards you.
10. Start the engine according tothe instructions found
in this manualand keep feet well away from the
tines at all times.
11. After striking a foreign object, stop the engine,
disconnect the spark plug wire and ground against
the engine. Thoroughly inspect the machine for any
damage. Repair the damage before starting and
operating.
12. Disengage all clutch levers and stop engine before
you leave the operating position (behind the
handles). Wait untilthe tines come to a complete
stop before unclogging the tines, making any
adjustments, or inspections.
13. Never run an engine indoors orin a poorly
ventilated area. Engine exhaust contains carbon
monoxide, an odorless and deadly gas.
14. Muffler and engine become hotand can cause a
burn. Do not touch.
15. Use caution when tilling near fences, buildings and
underground utilities. Rotating tines can cause
property damage or personal injury.
16. Do not overload machine capacity by attempting to
till soil to deep at to fast of a rate.
17. Ifthemachineshouldstartmakingan unusual noise
or vibration, stop the engine, disconnect the spark
plug wire and ground it against the engine. Inspect
thoroughly for damage. Repair any damage before
starting and operating.
18. Keep all shields, guards and safety devices in place
and operating properly.
19. Never pick up or carry machine while the engine is
running.
20. Useonlyattachmentsand accessoriesapproved by
the manufacturer. Failure todo so, can result in
personal injury.
21. If situations occur which are not covered in this
manual, use care and good judgment. Contact your
dealer or telephone [phone] for assistance
and the name of your nearest servicing dealer.
Maintenance & Storage
1. Never tamper with safety devices. Check their
proper operation regularly.
2. Check bolts and screws for proper tightness at
frequent intervals to keep the machine insafe
workingcondition.Also,visuallyinspectmachinefor
any damage.
3. Before cleaning, repairing, orinspecting, stop the
engine and make certain the tines and all moving
parts have stopped. Disconnect thespark plug wire
and ground it against theengine to prevent
unintended starting.
4. Do not change the engine governor settings or
over-speed the engine. The governor controls the
maximum safe operating speed of the engine.
5. Maintain or replace safety and instruction labels, as
necessary.
6. Follow this manual for safe loading, unloading,
transporting, and storage of this machine.
7. Never store the machine or fuel container inside
where there is an openflame, spark or pilot light
such as a water heater, furnace, clothes dryer etc.
8. Always refer to the operator’s manual for proper
instructions on off-season storage.
9. If the fuel tank has to be drained, do this outdoors.
10. Observe proper disposal laws and regulations for
gas, oil, etc. to protect the environment.
Your Responsibility
1. 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.
2. The safety label on the tilleris reproduced below for
your review. To ensure safe operation of thetiller,
follow the instructions on all labels closely.
PLACE MODEL PLATE HERE
WARNING WARNING
TO AVOID SERIOUS INJURY
READ THE OPERATOR'S MANUAL.
KNOW LOCATION AND
FUNCTIONS OF ALL CONTROLS
KEEP ALL SAFETY DEVICES AND
SHIELDS IN PLACE AND WORKING.
NEVER ALLOW CHILDREN OR
UNINSTRUCTED ADULTS TO
OPERATE TILLER.
SHUT OFF ENGINE BEFORE
UNCLOGGING TINES OR MAKING
REPAIRS.
KEEP BYSTANDERS AWAY FROM
MACHINE.
KEE P AWAY F RO M ROTATING
PARTS.
USE EXTREME CAUTION WHEN
REVERSING OR PULLING THE
MACHINE TOWARDS YOU.
KEEP AWAY FROM
ROTATING TINES.
ROTATING TINES
WILL CAUSE INJURY.
S00017
KEEP AWAY FROM
ROTATING TINES.
ROTATING TINES
WILL CAUSE INJURY.
C
U
T
O
U
T
DEPTH
STAKE
TRANSPORT
3"
1"
5"
7"

5
SECTION 2: ASSEMBLING YOUR TILLER
NOTE: This operator’s manual covers various models
of tillers. The units illustrated may vary slightly from
your unit. Follow only those instructions which pertain
to your model number.
NOTE: References to right or left side of the tiller are
determined from behind the unit in the operating
position.
To Remove Unit From Carton
• Remove staples, break glue on top flaps, or cut
tape at carton end and peel along top flap to open
carton.
• Remove loose parts included with unit (i.e.,
operator’s manual, etc.).
• Cut corners and lay carton down flat.
• Remove packing material.
• Roll or slide unit out of carton. Check carton
thoroughly for loose parts.
• Extend control cable and lay on the floor. Be careful
not to bend or kink control cable.
IMPORTANT: This unit is shipped without gasoline or oil
in the engine. Be certain to service engine with gasoline
and oil as instructed in the separate engine manual
before operating your machine.
Loose Parts In Carton
Depth Stake
Handle Assembly
Shift Rod
Handle Adjustment Rod (Model series 420 only)
NOTE: All hardware needed for assembly is attached
to the loose parts or the tiller.
Before Assembly
WARNING: Disconnect the spark plug wire
and ground it against the engine to prevent
unintended starting.
Attaching Depth Stake
• Tip the tiller forward so it rests on front
counterweight.
• Unthread the “T” knob from the top of the depth
stake and remove the flat washer and hex bolt.
Remove the hairpin clip from the clevis pin.
See Figure 1.
• Raise the tine shield hinge flap assembly and insert
the depth stake assembly in the slot (under the tine
shield) and up through the tine shield assembly.
• Insert clevis pin through the tine shield and depth
stake assemblies. Secure with hairpin clip.
• Insert hex bolt into the top hole of the depth stake
assembly. Place flat washer on the hex bolt and
thread “T” knob onto the hex bolt. Tighten securely.
See Figure 1.
• Tip the tiller back down so it rests on the tines.
Figure 1
Attaching Handle Assembly
• Remove the handle adjustment lock, flange nut
retainer bracket, shoulder bolt and lock nut from the
pivot bracket.
• Place the handle assembly in position in the handle
pivot bracket lining the upper holes in the handle
with the slots in the pivot bracket. See Figure 2.
Figure 2
• Lift up the handle assembly and align the bottom
holes in the handle assembly with the holes in the
pivot bracket. Insert shoulder bolt from the left side
of unit through the pivot bracket and the retainer
bracket on the right hand side of the unit.
See Figure 3.
T-Knob
Flat Washer Hex Bolt
Hairpin Clip
Clevis Pin
Depth Stake
Pivot Bracket
Handle Adjustment Lock
and Flange Nut
Retainer Bracket,
Shoulder Bolt, & Lock Nut

6
Figure 3
• Place the hex opening of the flange nut retainer
bracket over the flange nut securing the handle
adjustment lock and install the lock nut on the lower
shoulder bolt. See Figure 4.
• Pivot handle assembly into position desired.
Tighten the bottom bolt, lock nut, and the handle
adjustment lock securely.
Figure 4
Attaching Gear Shift Rod
NOTE: Model series 420 tiller has two control rods. The
gear shift rod is the longer rod and must be assembled
on the right side on handle.
• Remove the T-handle, hairpin clip, flat washer and
rubber washer from the end of the gear shift rod.
Slide the rod up through the right side of bracket on
the front of the handle assembly. See Figure 5.
• Insert the end of the gear shift rod through the
opening in the top of the shift cover and into the
shift bracket. Secure with rubber washer first, flat
washer, and then hairpin clip. See Figure 5.
• Install the nut and T-handle on the gear shift rod.
Figure 5
Attaching Handle Adjustment Rod
(Model 420 series only)
• Remove the T-handle, flange nut, hairpin clip, and
rubber washer from the ends of the handle
adjustment rod. Slide the rod up through the left
side of bracket on the front of the handle assembly.
Refer to Figure 5.
Figure 6
Retainer Bracket
Shoulder Bolt & Lock Nut
Handle Adjustment Lock
Retainer Bracket
T-Handles
Gear Shift Rod Handle
Adjustment Rod
Bracket
Gear Shift Rod
Shift Cover
Opening
Rubber Washer
Flat Washer
Hairpin Clip
(Model Series 420)
Handle
Adjustment Rod
Positioner
Bracket
Rubber
Washer
Hairpin
Clip

7
• Slide the rubber washer on the unthreaded end of
the handle adjustment rod and insert the end of the
handle adjustment rod into the positioner bracket
beneath the handle and on top of the tine shield.
Secure with hairpin clip. See Figure 6.
• Reinstall the nut and T-handle.
Attaching Clutch Cable
• Route the clutch cable underneath the handle and
through the cable clip. Be careful not to bend or
kink the cable. See Figure 7.
Figure 7
• Remove one hex nut from the threaded casing on
the end of the cable. Slip the wire up through the
slot on the cable bracket underneath the handle.
• Push the end of the casing up through the cable
bracket. Rethread the hex nut on the end of the
cable. Do not tighten at this time.
Figure 8
• Pull the cable upwards to obtain slack and hook the
Z end of the cable from right to left into the bracket
on the clutch control (beneath the handle panel).
Tighten the nut against the cable bracket.
See Figure 8.
NOTE: Do not overtighten clutch cable, since too much
tension may cause it to break.
Final Clutch Adjustment
IMPORTANT: Service the engine with oil and gasoline
before checking this adjustment. Refer to the separate
engine manual packed with your tiller.
• Position the tiller so the front counterweight is
against a solid object, such as a wall. With the gear
selectionlever inNEUTRAL, start theengine.Refer
to Operation section.
NOTE: Keep hands out of belt area while unit is
operating.
• Standing on the right side of the tiller, visually
examine the belt (inside the belt cover). It should
not be turning.
•If the belt turns with the unit in neutral, adjust by
moving the hex nut below the cable bracket down a
few turns.Tighten the upper hex nut against the
bracket. See Figure 8.
• Now move the shift lever to FORWARD (Wheels
Forward) position. Carefully engage the clutch by
squeezing the clutch handle against the handle.
The wheels should spin.
•If the wheels do not spin with the unit in
forward, adjust by moving the hex nut which is
above the cable bracket up a few turns. Tighten the
bottom hex nut against the bracket.
Recheck both adjustments, and readjust as necessary.
Make certain hex nuts at cable bracket are tight (do not
overtighten clutch cable).
NOTE: If additional adjustment is required, it may be
necessary to remove the belt cover and move the hex
nuts at the other end of the clutch cable to increase belt
tension.
Tire Pressure
The tires on your unit may be over-inflated for shipping
purposes. Reduce the tire pressure before operating
the unit. Recommended operating tire pressure is
approximately 14 p.s.i. on 14 inch tires and 20 p.s.i. on
16 inch tires.(Check sidewall of tire for tire
manufacturer’s recommended pressure).
WARNING: Maximum tire pressure under
any circumstances is 30 p.s.i. Equal tire
pressure should be maintained on both
tires.
Cable Clip
Handle Adjustment Lock
Clutch Cable
Slot in
Cable Bracket
Lock
Washer
Hex Nut
Hex Nut
Z End
(Viewed From Under Handle)

8
SECTION 3: KNOW YOUR TILLER
Figure 9
WARNING: Read, understand, and follow
all instructions and warnings on the
machine and in this manual before
operating.
Gear Selection Handle
The gear selection handle is located on the front of the
handle assembly (right handle on Model 420 Series). It
is used to select NEUTRAL, REVERSE, or one of the
FORWARD modes.
This tiller is designed for the gear selection handle to be
moved while the engine is running. (It will be difficult to
obtain all four positions with the engine off.) Pull or push
the handle so that the indicator on top of shift cover
points to the area of the operating mode desired.
See Figure 9.
NOTE: If difficulty is encountered in moving the gear
selection handle, refer to following helpful hints. To shift
into forward or reverse wheel drive, move tiller forward
slightly then backward to allow the gears to
synchronize.
To shift into forward wheels and tine drive, push
forward slightly on the gear selection handle and slowly
engage the clutch handle allowing the gears to
synchronize. To stop forward movement and tine drive,
release the clutch handle. Do not shift gears with the
clutch handle engaged except when engaging the
tines.
Reverse
Reverse wheel drive only.
Neutral
Transmission is in neutral.
Wheels Forward
Forward wheel drive only.
Tines Reverse
Forward wheel drive and reverse tine drive.
WARNING: Make certain unit is in
NEUTRAL when starting the engine.
Clutch Handle
The clutch handle is located beneath the handle.
Squeezing the clutch handle against the handle
engages the wheel and tine drive mechanisms.
See Figure 9.
Throttle Control
The throttle control lever is located on the engine. It
controls the engine speed and stops the engine.
Choke Lever (If Equipped)
The choke lever is located by the throttle. It is used to
enrich the fuel mixture in thecarburetor when starting a
cold engine.
Gear Selection
Handle
Handle Height
Adjustment Lock
Clutch Handle
Depth Stake
Model 410 Series
Model 420 Series
Gear Shift Rod
Handle
Adjustment Rod

9
Primer Button (IfEquipped)
The primer button is located behind the air cleaner. It is
used to enrich the fuel mixture in the carburetor when
starting a cold engine.
Depth Stake
The depth stake controls the tilling depth. Refer to
‘‘Setting the Depth’’ in the Operating Section.
Handle Adjustment Lock
The handle may be adjusted to the height desired.
Loosen the handle height adjustment lock a few turns.
Pivot handle up ordown to desired position. Tighten
lock. See Figure 9.
On Model 420 series, the handle may also be adjusted
to be in line with the tiller or swung to the left or right so
the operator is not walking in the freshly tilled soil. To
adjust the handle position from side to side, pull the
handle adjustment handle back, pivot the tiller handle to
desired position and release the handle.
Fuel Shut-Off Valve (IfEquipped)
Make sure the valve is in the On (horizontal) position
when starting the unit. Any time the tiller is not in
operation (i.e., storing, performing maintenance or
adjustment), make sure the valve is in the OFF
(vertical) position.
Engine Controls
See the separate engine manual for additional
information and functions of the engine controls.
SECTION 4: OPERATING YOUR TILLER
WARNING: Read, understand, and follow
all instructions and warnings on the
machine and in this manual before
operating.
Before Starting
Gas And Oil Fill-Up
Service the engine with gasoline and oil as instructed in
the separate engine manual packed with your tiller.
Read instructions carefully.
WARNING: Use extreme care when
handling gasoline. Gasoline is extremely
flammable and the vapors are explosive.
Never fuel machine indoors or while the
engine is hot or running.
Starting Engine
NOTE: When pushing the unit with the engine off, you
will hear a ratcheting sound (gear noise) which is
normal.
WARNING: Be sure no one is standing in
front of the tiller while the engine is
running or being started.
• Place gear selection lever in NEUTRAL.
• Place the throttle control lever in FAST position or if
equipped, place the engine speed control in the
START position.
• Move choke lever to CHOKE position or if
equipped, push primer two (2) or three (3) times.
Wait about two (2) seconds between each push.
NOTE: A warm engine may not require choking or to be
primed.
• Stand at side of tiller. Grasp the starter handle and
pull out slowly, until it pulls slightly harder. Let rope
rewind slowly.
• Pull starter handle rapidly. Do not allow handle to
snap back. Allow it to rewind slowly while keeping a
firm hold on the starter handle.
• Repeat previous steps until engine starts.
• As engine warms up and begins to operate evenly,
move choke lever gradually to RUN position. If
engine falters, return to choke position, then slowly
move to RUN position.
• Refer to engine manual for additional engine
information.
NOTE: After starting and prior to using the tiller for the
first time, be certain to check the clutch adjustment as
described in “Checking the Clutch Adjustment” section
of the Assembly Instructions.
To Stop Engine
• Move throttle control to STOP or OFF position.
• Disconnect spark plug wire and ground to prevent
accidentally starting while equipment is
unattended.
NOTE: After the first ten hours of operation, recheck
the clutch adjustment. Refer to final clutch adjustment
in Assembly Instructions.
Setting The Depth
Tilling depth is controlled by the depth stake which can
be adjusted to five different settings. Adjust the side
shields as you adjust the depth stake.

10
WARNING: Be certain spark plug wire is
disconnected and grounded against the
engine when performing any adjustments.
• When using the tiller for the first time, use the
second adjustment hole from the top (1" of tilling
depth). See Figure 10.
Figure 10
• When breaking up sod and for shallow cultivation,
use the setting which gives 1" of tilling depth
(second hole from the top). Place the side shields in
their lowest position.
• For further depth, raise the depth stake and side
shields and also make one or two more passes
over the area.
• When tilling loose soil, the depth stake may be
raised to its highest position (use bottom
adjustment hole) to give the deepest tilling depth.
Raise the side shields to their highest position.
• To transport tiller, lower the depth stake (use top
adjustment hole).
To adjust the depth stake, remove the clevis pin and
hairpin clip. Move the depth stake to the desired setting
and secure with the clevis pin and hairpin clip.
See Figure 10.
To adjust the side shields, remove the wing nuts. Move
the side shield to the desired position and replace the
wing nuts. Tighten securely.
Operating the Tiller
• Select the depth stake setting.
• Start engine as instructed on the previous page.
• Move gear selection handle to one of the forward
modes or reverse.
WARNING: Do not move the gear selection
handle with the wheels or tines engaged.
Make certain the unit is stopped
completely before changing the gear
selection. A partial engagement may be
necessary when engaging tines.
• Squeeze the clutch handle against the handle to
engage the wheels and tines.
NOTE: Make certain the gear selection indicator is
correctly positioned before engaging the clutch handle.
If it is between gears, the engine will stall.
To transport tiller, do not engage the tines. Select the
wheel drive only.
WARNING: Do not push down on the
handles so that the wheels are lifted off the
ground while using the tine drive, or the
tiller could move backward and cause
personal injury.
For best results, it is recommended the garden be tilled
twice (lengthwise, then widthwise) to pulverize the soil.
SECTION 5: MAKING ADJUSTMENTS
WARNING: Never attempt to make any
adjustments while the engine is running,
except where specified in operator’s
manual.
Handle Adjustment
The handle may be adjusted to the height desired and
on Model 420 series, the handle may also be adjusted
to be in line with the tiller or swung to the left or right.
Refer to the handle adjustmentin the Know Your Tiller
section for details.
Belt Tension Adjustment
Periodic adjustment of the belt tension may be required
due to normal stretch and wear on the belt. Adjustment
is needed if the tines or wheels seem to hesitate while
Use This Position
First Time Transport Position
1” 3”
5”
7”
Clevis Pin
Use This Hole For
Lowest (Shallowest)
Position
Use This Hole For
Highest (Deepest)
Position
Side Shields

11
turning, but the engine maintains the same speed.
To adjust the tension on the belt, refer to Final Clutch
Adjustment in Assembly Instructions.
Engine Adjustment
Refer to the separate engine manual for engine
adjustment instructions.
SECTION 6: MAINTAINING YOUR TILLER
WARNING: Disconnect the spark plug wire
and ground it against the engine before
performing any repairs or maintenance.
Engine
Refer to the separate engine manual for engine
maintenance instructions.
Maintain engine oil as instructed in the separate
engine manual packed with your unit. Read and follow
instructions carefully.
Service air cleaner every ten hours under normal
conditions. Clean every hour under extremely dusty
conditions. Poor engine performance and flooding
usually indicates that the air cleaner should be
serviced. To service the air cleaner, refer to the
separate engine manual packed with your unit.
IMPORTANT: Never run your engine without air cleaner
completely assembled.
The spark plug should be cleaned and the gap reset
every 25 hours of engine operation. Spark plug
replacement is recommended at the start of each tiller
season; check engine manual for correct plug type and
gap specification.
Clean the engine regularly with a cloth or brush. Keep
the cooling system (blower housing area) clean to
permit proper air circulation which is essential to engine
performance and life. Be certain to remove all dirt and
combustible debris from muffler area.
Lubrication
Transmission
The transmission is pre-lubricated and sealed at the
factory. It requires no checking unless the transmission
is disassembled. To fill with grease, lay the right half of
the transmission on its side, add 22 ounces of
Benalene 920 grease, and assemble the left half to it.
This grease can be obtained at your nearest authorized
dealer by ordering part number 737-0300.
Clutch Handle
Lubricate the pivot point on the clutch handle and the
cable at least once aseason with light oil. The control
must operate freely in both directions.
Pivot Points
Lubricate all pivot points and linkages at least once a
season with light oil.
TineShafts
Remove tine assemblies and lubricate the tine shafts at
least once a season.
Wheel Shafts
Remove wheel assemblies and lubricate the axle shafts
at least once a season.
Cleaning Tine Area
Clean the underside of the tine shield after each use.
The dirt washes off the tines easier if rinsed off
immediately instead of after it dries. Always towel dry
the tiller afterwards and apply a light coat of oil or
silicone to prevent rusting or water damage.
IMPORTANT: Never use a "pressure washer” to clean
your tiller. Water can penetrate tight areas of the tiller
and its chaincase and cause serious damage to the
unit.
Tires
Recommended operating tire pressure is
approximately 14 p.s.i. on 14 inch tires and 20 p.s.i. on
16 inch tires. (Check sidewall of tire for tire
manufacturer’s recommended pressure). Maximum tire
pressure under any circumstances is 30 p.s.i. Equal tire
pressure should be maintained on both tires.
When installing a tire to the rim, be certain rim is clean
and free of rust. Lubricate both the tire and rim
generously.
WARNING: Excessive pressure (over 30
p.s.i.) when seating beads may cause tire/
rim assembly to burst with force sufficient
to cause serious injury.
BeltReplacement
Your tiller has been engineered with a belt made of
special material (Kevlar Tensile) for longer life and
better performance. It should not be replaced with an
off-the-shelf belt. Order all belts through you authorized
service dealer.
• Disconnect and ground the spark plug wire against
the engine.
• Remove the belt cover from the left side of the tiller
by removing two torx head screws from the top of
belt cover.

12
• Remove two hex cap nuts and flat washers from
front side of the belt cover. Remove the hex nut and
flat washer at the backof the cover.
• Remove the belt keeper assembly located behind
the engine pulley by removing two hex bolts and
lock washers. See Figure 11.
• Remove belt and reassemble the new belt. Follow
instructions in reverse order.
NOTE: Upon reassembly, make certain the belt is
routed over the idler pulley and inside of belt keepers by
engine pulley. See Figure 11.
Figure 11
Off-Season Storage
If the tiller will not be used for a period longer than 30
days, the following steps should be taken to prepare the
tiller for storage.
• Clean the exterior of engine and the entire tiller
thoroughly. Lubricate the tiller as described in the
lubrication instructions.
• We do not recommend the use of pressure
washers to clean your unit. They may cause
damage to electric components, spindles, pulleys,
bearings or the engine. The use of pressure
washers will result in shortened life and reduce
serviceability.
• Refer to the engine manual for correct engine
storage instructions.
• Wipe tines with oiled rag to prevent rust.
• Store tiller in a clean, dry area. Do not store next to
corrosive materials, such as fertilizer.
NOTE: When storing any type of power equipment in
an unventilated or metal storage shed, care should be
taken to rustproof the equipment. Using a light oil or
silicone, coat the equipment and especially any
springs, bearings, and cables.
Engine
Pulley Belt Keeper
Hex Bolt
Idler Pulley

13
SECTION 7: TROUBLE SHOOTING GUIDE
NOTE: For repairs beyond the minor adjustments above, contact your local authorized service dealer.
Trouble Possible Cause(s) Corrective Action
Engine fails to
start Fuel tank empty, or stale fuel.
Throttle control lever not in correct starting
position (if so equipped).
Blocked fuel line.
Dirty aircleaner.
Choke not in ON position.
Spark plug wire disconnected.
Faulty spark plug.
Engine flooded.
Fill tank with clean, fresh gasoline. Fuel will not last over thirty
days unless a fuel stabilizer is used.
Move throttle lever to start position.
Clean fuel line.
Refer tothe engine manual packed with your unit.
Move choke to ON position.
Connect wire to spark plug.
Clean,adjust gap or replace.
Refer tothe engine manual packed with your unit.
Engine runs
erratic Unit running on CHOKE.
Spark plug wire loose.
Blocked fuel line or stale fuel.
Vent in gas cap plugged.
Water or dirt in fuel system.
Dirty air cleaner.
Carburetor out of adjustment.
Move choke lever to OFF position.
Connect and tighten spark plug wire.
Cleanfuel line; filltank with clean, freshgasoline. Fuelwill not
last over thirty days unless a fuel stabilizer is used.
Clear vent.
Drain fuel tank. Refill with fresh fuel.
Refer tothe engine manual packed with your unit.
Refer tothe engine manual packed with your unit.
Engine overheats Engine oil level low.
Dirty air cleaner.
Air flow restricted.
Carburetor not adjusted properly.
Fill crankcase with proper oil.
Refer tothe engine manual packed with your unit.
Refer tothe engine manual packed with your unit.
Adjust carburetor as instructed in separate engine manual.
Tines do not
engage Foreign objectlodged in tines.
Tine clevis pin(s) missing.
Pulley and idler not in correct
adjustment.
Not shifting properly.
Controlcable not adjusted properly.
Belt worn and/or stretched.
Dislodge foreign object.
Replace tine clevis pin(s).
Take unit to authorized service dealer.
Refer to controls section of operator’s manual for proper
shifting procedures.
Adjust control cable (see assembly instructions).
Replace belt.
Wheels do not
engage Clevis pin missing.
Tiller is not being shifted properly.
Controlcable not adjusted properly.
Belt worn and/or stretched.
Replace clevis pin.
Refer to controls section of operator’s manual for proper
shifting procedures.
Adjust control cable (see assembly instructions).
Replace belt.

14
Model Series 410
1
1
2
3
4
5
6
7
8
9
10
11
9
13
14
15 16
18
17
19
20 21
22
23
24
25
26
27
28
10
29
30
30
31
33
33
34
35
35
36
17 37
46
39
17
38
32
17
40
41 43
42
12
17
44
45
47

15
Model Series 410
NOTE: For painted parts, please refer to the list of color codes below. Please add the applicable color code, wherever needed,
to the part number to order a replacement part. For instance, if a part numbered 700-xxxx is painted Oyster Gray, the part
number to order would be 700-xxxx-0662.
Black — 0691; Black, Powder — 0637; Blue, Midnight — 0667; Charcoal — 0483; Grey — 0648;
Grey, Oyster — 0662; Orange — 0606; Red — 0650; Red, MTD — 0638; Silver — 0629; Yellow — 0674.
Ref.
No. Part No. Part Description
1. 710-1017 Tap Screw 1/4-14 x.625
2. 786-0131 Handle Cover w/o Throttle
3. 710-0896 Hex Washer Screw 1/4-14 x.625
4. 720-0278A Foam Grip
5. 735-0246 End Plug
6. 647-0014 Clutch Control Assembly
7. 786-0118 Return Bracket - LH
8. 786-0098 Return Bracket - RH
9. 649-0017 Handle Assembly
10. 720-0210A Knob
11. 712-3008 Jam Nut 3/8-16
12. 726-0330 Cable Clip
13. 747-0902 Shift Control
14. 735-0127 Rubber Washer.33 ID x.87 OD
15. 714-0104 Cotter Pin
16. 736-0204 Flat Washer.344 ID x.62 OD
17. 712-3004A Hex Flange Lock Nut 5/16-18
18. 784-0191 Retainer Bracket
19. 712-0379 Flange Lock Nut 3/8-24
20. 750-0885A Spacer.322 ID x.625 OD
21. 784-0190 Adjustable Crank Handle
22. 710-0189 Hex Screw 5/16-18 x 3.0
23. 786-0109 Handle Mounting Bracket - LH
24. 786-0108 Handle Mounting Bracket - RH
25. 726-0106 Cap Nut
26. 747-0432 Rod
27. 786-0113 Rear Tine Shield Flap
28. 710-3005 Hex Cap Screw 3/8-16 x 1.25
29. 736-0117 Flat Washer.375 ID x.620 OD
30. 710-3008 Hex Cap Screw 5/16-18 x.75
31. 738-0849 Hex Screw 5/16-18 x.75
32. 786-0085 Tine Shield
33. 712-0421 Wing Nut
34. 686-0044A End Cover Assembly
35. 786-0090 Side Shield
36. 786-0076 Shield Bracket RH
37. 710-0376 Hex Cap Screw 5/16-18 x 1.0
38. 736-0169 Lock Washer 3/8
39. 711-0415 Clevis Pin
40. 712-0798 Hex Nut 3/8-16
41. 710-3038 Hex Cap Screw 5/16-18 x.875
42. 686-0043A Shield Tine Bracket Assembly
43. 786-0120 Depth Stake
44. 786-0077 Shield Bracket - LH
45. 710-3097 Carriage Bolt 3/8-16 x 1.0
46. 714-0147 Cotter Pin
47. 746-0916 Clutch Cable
Ref.
No. Part No. Part Description

16
Model Series 410 thru 420
12
34
4
5
67
21
8
910
20
11
12
13
14
15
16
17
18
19
20 21
21
22 23 24
25 26
27 28
29
30
31
32 33
34 35 36
37 38
1
39
40
41
42
43

17
Model Series 410 thru 420
Ref.
No. Part No. Part Description
1. 710-1017 Hex Screw 1/4-20 x.625
2. 786-0101B Shift Cover
3. 686-0095 Crank Shift Assembly
4. 712-3004A Hex Lock Nut 5/16-18
5. 715-0120 Spiral Pin
6. 786-0117 Shift Cover Mounting Bracket
7. 710-3008 Hex Cap Screw 5/16-18 x.75
8. 712-3010 Hex Nut 5/16-18
9. 736-0242 Bell Washer.340 ID x.872 OD
10. 710-3180 Hex Cap Screw 5/16-18 x 1.75
11. 710-1007 Hex Washer Screw 3/8-16 x 1.5
12. 619-0009 Frame Counterweight
13. 642-0015 Tine Assembly - LH
642-0016 Tine Assembly - RH
14. 711-0415 Clevis Pin
15. 714-0149B Cotter Pin
16. 634-0240 Complete Wheel Ass’y - RH (14”)
634-0241 Complete Wheel Ass’y - LH (14”)
634-0238 Complete Wheel Ass’y - RH (16”)
634-0239 Complete Wheel Ass’y - LH (16”)
17. 711-1017 Clevis Pin
18. 714-0104 Cotter Pin
19. 734-1796 Tire Only (14”)
734-0808 Tire Only (16”)
20. 712-3004A Flange Lock Nut 5/16-18
21. 710-1090 Flange Screw 5/16-18 x 1.25
22. 686-0031A Belt Keeper Bracket Ass’y
23. 736-0119 Lock Washer 5/16
24. 710-0237 Hex Cap Screw 5/16-24 x.625
25. 756-0971 Inner Pulley Half
26. 756-0972 Outer Pulley Half
27. 754-0438 V-Belt
28. 756-0405 Flat Idler
29. 738-0899 Bolt 5/16-18 x 1/4-28 x 2.35
30. 736-0256 Flat Washer.635 ID x.930 OD
31. 756-0634 Flat Pulley
32. 736-0105 Spring Washer.401 ID x.870 OD
33. 712-0379 Flange Lock Nut 3/8-24
34. 736-0452 Bell Washer.396 ID x 1.140 OD
35. 710-0152 Hex Cap Screw 3/8-24 x 1.0
36. 786-0080 Idler Bracket
37. 710-0723 Hex Cap Screw 3/8-16 x 1.25
38. 738-0876 Shoulder Nut 7/16-20
39. 736-3020 Flat Washer.271 ID x.630 OD
40. 786-0100 Belt Cover
41. 712-0392 Hex Lock Nut 1/4
42. 786-0107 Cable Bracket
43. 686-0094 Gear Case Assembly
Ref.
No. Part No. Part Description
IMPORTANT: For a proper working machine, use Factory
Approved Parts.
V-BELTS are specially designed to engage and disengage
safely. A substitute (non OEM) V-Belt can be dangerous by not
disengaging completely.

18
Model Series 420
1
1
2
3
45
6
7
8
9
10
11
12
13
14 15
16
17
18
20
21
28
22
23
24
25
26
29
30
31
32
33
34
35
35
36
37
11
39
39
40
41
42
43
44
45
31
46
47
24
48 49
50
24
24
51
52 53
54
55
19 27

19
Model Series 420
NOTE: For painted parts, please refer to the list of color codes below. Please add the applicable color code, wherever needed,
to the part number to order a replacement part. For instance, if a part numbered 700-xxxx is painted Oyster Gray, the part
number to order would be 700-xxxx-0662.
Black — 0691; Black, Powder — 0637; Blue, Midnight — 0667; Charcoal — 0483; Grey — 0648;
Grey, Oyster — 0662; Orange — 0606; Red — 0650; Red, MTD — 0638; Silver — 0629; Yellow — 0674.
Ref.
No. Part No. Part Description
1. 710-1017 Tap Screw 1/4-14 x.625
2. 786-0131 Handle Cover w/o Throttle
3. 746-0916 Clutch Cable
4. 720-0278A Foam Grip
5. 647-0014 Clutch Control Assembly
6. 735-0246 End Plug
7. 710-0896 Hex Washer Screw 1/4-14 x.625
8. 649-0016 Handle Assembly
9. 786-0118 Return Bracket - LH
10. 786-0098 Return Bracket - RH
11. 720-0210A Knob
12. 712-3008 Jam Nut 3/8-16
13. 747-0902 Shift Control
14. 747-0901 Handle Adjustment Rod
15. 714-3021 Cotter Pin
16. 712-0386A Slotted Hex Nut 5/8
17. 736-0317 Bell Washer.64 ID x 1.25 OD
18. 712-0375 Hex Lock Nut 3/8-16
19. 726-0330 Cable Clip
20. 732-0493 Torsion Spring
21. 748-0375 Handle Swing Link
22. 712-0379 Flange Lock Nut 3/8-24
23. 784-0191 Retainer Bracket
24. 712-3004A Hex Flange Lock Nut 5/16-18
25. 784-0190 Adjustable Crank Handle
26. 710-0521 Hex Cap Screw 3/8-16 x 3.0
27. 710-0189 Hex Cap Screw 5/16-18 x 3.0
28. 686-0048 Handle Pivot Bracket Assembly
29. 710-3097 Carriage Bolt 3/8-16 x 1.0
30. 686-0071 Handle Bracket Assembly
31. 712-0421 Wing Nut
32. 735-0127 Rubber Washer.33 ID x.87 OD
33. 736-0204 Flat Washer.344 ID x.62 OD
34. 714-0104 Cotter Pin
35. 786-0090 Side Shield
36. 710-3005 Hex Cap Screw 3/8-16 x 1.25
37. 736-0117 Flat Washer.375 ID x.620 OD
39. 710-3008 Hex Cap Screw 5/16-18 x.75
40. 738-0849 Hex Screw 5/16-18 x.75
41. 786-0113 Rear Tine Shield Flap
42. 786-0085 Tine Shield
43. 686-0044A End Cover Assembly
44. 747-0432 Rod
45. 726-0106 Cap Nut
46. 786-0076 Shield Bracket RH
47. 786-0077 Shield Bracket - LH
48. 710-0376 Hex Cap Screw 5/16-18 x 1.0
49. 714-0147 Cotter Pin
50. 711-0415 Clevis Pin
51. 686-0043A Shield Tine Bracket Assembly
52. 710-3038 Hex Cap Screw 5/16-18 x.875
53. 712-0798 Hex Nut 3/8-16
54. 736-0169 Lock Washer 3/8
55. 786-0120 Depth Stake
Ref.
No. Part No. Part Description

20
Model Series 410 thru 420
1
2
3
4
56
7
10
11
12
13
14
15
16
17
19
20
21 22
13
23
15
11 24
25
26
27
25
1
28
429 32
30
9
31
32 33
34
35 36
37
38 39 40
40
4142
43
44
45
46
47
48
49
50 51 52
51
53 48