MTD 410 Thru 420, Yard Machines 410, Yard Machines 420 Operator's Manual

Operator’s Manual

Rear Tine Tiller

410 Thru 420 Series

Models

IMPORTANT: Read safety rules and instructions carefully before operating equipment.

Warning:

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 368022 Cleveland, Ohio 44136-9722.

This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-

MTD PRODUCTS INC. P.O. BOX 368022 CLEVELAND, OHIO 44136-9722

PRINTED IN U.S.A.

FORM NO.

770-10136A.fm

(10/99)

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

Service............................................................................................................... 11

Off-Season Storage ........................................................................................... 12

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.

(Model Number)

CLEVELAND, OHIO 44136

(Serial Number)

MTD PRODUCTS INC

Copy the model number here:

Copy the serial number here:

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.

2

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 your tiller. 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: Your tiller 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 tiller is capable of amputating hands and feet. Failure to observe the following safety
instructions could result in serious injury or death.

GENERAL OPERATION

• Read this operator’s manual carefully in its entirety
before attempting to assemble this machine. Read,
understand, and follow all instructions on the
machine and in the manual(s) before operation. Be
completely familiar with the controls and the proper
use of the machine before operating it. Keep this
manual in a safe place for future and regular
reference and for ordering replacement parts.

• Your tiller is a powerful tool, not a plaything.
Therefore, exercise extreme caution at all times.
Your unit has been designed to perform one job: to
till soil. Do not use it for any other purpose.

• Never allow children under age 14 to operate the
unit. Children 14 years and older should only
operate the unit under close parental supervision.
Only responsible individuals who are familiar with
these rules of safe operation should be allowed to
use your unit.

• Do not operate tiller while under the influence of
alcohol or drugs.

• Keep the area of operation clear of all persons,
particularly small children and pets. Stop the engine
when they are in the vicinity of your tiller.

• Wear sturdy, rough-soled work shoes and close
fitting slacks and shirt. Shirt and slacks that cover
the arms and legs and steel-toed shoes are
recommended. Do not wear loose fitting clothes or
jewelry and secure hair so it is above shoulder
length. They can be caught in moving parts. Never
operate a unit in bare feet, sandals or sneakers.

• Operate tiller only in daylight or good artificial light.

• Do not start tiller unless the shift lever (if provided)
is in the neutral (N) position.

• Do not allow anyone to stand or walk in front of tiller
when starting or running engine.

• Do not place feet or hands on or near the tines
when starting the engine or while the engine is
running.

• Never attempt to make depth bar, tine width, cable,
handle, or wheel adjustments while the engine is
running.

• Do not leave the tiller unattended with the engine
running.

• Before attempting to remove rocks, bricks and
other objects from tines, stop the engine and be
sure the tines have stopped completely. Disconnect
the spark plug wire and move it away from the
spark plug.

• If your machine should start making an unusual
noise or vibration, immediately stop the engine and
allow the machine to come to a complete stop.
Disconnect the spark plug wire and move it away
from the spark plug. Take the following steps:

• Inspect for damage.

• Repair or replace any damaged parts.

• Check for any loose parts and tighten to assure

continued safe operation.

• Muffler and engine become hot and can cause a
burn. Do not touch.

• Keep all shields, guards and safety devices in place
and operating properly.

• Use caution when tilling near fences, buildings and
underground utilities. Rotating tines can cause
damage or injury.

• Do not operate engine if air cleaner or cover over
carburetor air intake is removed, except for
adjustment. Removal of such parts could create a
fire hazard.

• Only use accessories approved for this machine by
the manufacturer. Read, understand, and follow all
instructions provided with the approved accessory.

• If situations occur which are not covered by this
manual, use care and good judgment. Contact your
dealer for assistance.

3

CHILDREN

• Tragic accidents can occur if the operator is not
alert to the presence of small children. Children are
often attracted to the tilling activity. Never assume
that children will remain where you last saw them.

• Keep children out of the work area and under the
watchful eye of a responsible adult other than the
operator.

• Be alert and turn the unit off if a child enters the
area.

• Never allow children under the age of 14 to operate
the tiller.

SERVICE

• Use extreme care in handling gasoline and other
fuels. They are extremely flammable and the
vapors are explosive.

• Store fuel and oil in approved containers, away
from heat and open flame, and out of the reach of
children. Check and add fuel before starting the
engine. Never remove gas cap or add fuel while the
engine is running. Allow engine to cool at least two
minutes before refueling.

• Replace gasoline cap securely and wipe off any
spilled gasoline before starting the engine as it may
cause a fire or explosion.

• Extinguish all cigarettes, cigars, pipes and other
sources of ignition.

• Never refuel unit indoors because flammable
vapors will accumulate in the area.

• Never store the machine or fuel container inside
where there is an open flame or spark such as a
gas hot water heater, space heater, clothes dryer or
furnace.

• Never run your machine in an enclosed area as the
exhaust from the engine contains carbon
monoxide, which is a odorless, tasteless and
deadly poisonous gas.

• To reduce fire hazard, keep engine and muffler free
of leaves, grass, and other debris build-up. Clean
up fuel and oil spillage. Allow unit to cool at least 5
minutes before storing.

• Before cleaning, repairing, or inspecting, make
certain the tines and all moving parts have stopped.
Disconnect the spark plug wire and keep wire away
from spark plug to prevent accidental starting. Do
not use flammable solutions to clean air filter.

• 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.

• Keep all nuts, bolts, and screws tight to be sure the
equipment is in safe working condition.

• Never tamper with safety devices. Check their
proper operation regularly.

• Do not alter or tamper with the engine’s governor
setting. The governor controls the maximum safe
operating speed of the engine. Overspeeding the
engine is dangerous and will cause damage to the
engine and to other moving parts of the machine.

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.

4

SECTION 2: ASSEMBLING YOUR TILLER

This instruction manual covers several different model
tillers. Follow only those instructions which pertain to
your unit.

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:

GASOLINE or OIL. After assembly, see separate

engine manual for proper fuel and engine oil
recommendations.

NOTE: Left and right is determined from the operator’s
position, standing behind the tiller.

The Engine is shipped WITHOUT

Loose Parts In Carton

(1) Depth Stake
(1) Handle Assembly
(1) Shift Rod
(1) Handle Adjustment Rod (Model 420 series only)

NOTE: All hardware needed for assembly is attached
to the loose parts or the tiller.

• Tip the tiller forward so it rests on front

• Unthread the “T” knob from the top of the depth

• Raise the tine shield hinge flap assembly. Insert the

• Insert clevis pin through the tine shield and depth

• Insert hex bolt into the top hole of the depth stake

• Tip the tiller back down so it rests on the tines.

Attaching the Handle Assembly

• Remove the handle adjustment lock, flange nut

• Place the handle assembly in position in the handle

Handle Adjustment

counterweight.

stake, and remove the flat washer and hex bolt.
Remove the hairpin clip from the clevis pin. See
Figure 1.

depth stake assembly in the slot (under the tine
shield) and up through the tine shield assembly as
shown in Figure 1.

stake assemblies. Secure with hairpin clip.

assembly. Place flat washer on the hex bolt and
thread “T” knob onto the hex bolt. See Figure 1.
Tighten securely.

retainer bracket, shoulder bolt and lock nut from the
pivot bracket.

pivot bracket lining the upper holes in the handle
with the slots in the pivot bracket. See Figure 2.

Flange Nut Retainer Bracket

Shoulder Bolt

Lock Nut

Lock

Flange Nut

Attaching The Depth Stake Assembly

T-Knob, Flat Washer, Hex Bolt

Tine Shield

Hinge Flap

Clevis Pin

Hairpin Clip

Depth Stake

Figure 1

Pivot Bracket

Figure 2

• Lift up the handle assembly and align the bottom
holes in the handle assembly with the holes in the
pivot bracket. Insert hex bolt (with hex nut retainer
attached through the round hole). The head of hex
bolt, flange nut retainer bracket should be to the
right hand side of the unit. See Figure 3.

5

Flange Nut Retainer Bracket

Shoulder Bolt

Lock Nut

T-Handles

Lift up
Handle

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.

Hex Hole in
Retainer Bracket
over Flange Nut

Handle Adjustment

Lock

Gear Shift

Rod

Shift Cover

Handle

Adjustment Rod

(Model 420 series only)

Figure 5

Gear Shift Rod

Opening

Rubber Washer

Flat Washer
Hairpin Clip

Figure 6

Figure 4

• Pivot handle assembly into position desired.
Tighten the bottom bolt and nut securely. Tighten
the handle adjustment lock.

Attaching The Gear Shift Rod

NOTE: Model 420 series tiller has two control rods. The
gear shift rod is the longer rod.

• Remove the T-handle, nut, hairpin clip, flat washer
and rubber washer from the end of the gear shift
rod. Slide the rod up through the bracket on the
front of the handle assembly (use the right hand
hole for Model 420 series). 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. See Figure 6. Secure with rubber
washer first, then flat washer and hairpin clip.

• Install the nut and T-handle on the gear shift rod.

Attaching The Handle Adjustment Rod

(Model 420 series only)

Handle

Adjustment

Rod

Positioner

Bracket

Rubber
Washer

Figure 7

• Remove the T-handle, nut, hairpin clip, and rubber
washer from the ends of the handle adjustment rod.
Slide the rod up through the left side of the bracket
on the front of the handle assembly. Refer to Figure

5.

Hairpin

Clip

6

• Slide the rubber washer on the unthreaded end of
the handle adjustment rod. Insert the end of the
handle adjustment rod into the positioner bracket
beneath the handle, on top of the tine shield. See
Figure 7. Secure with hairpin clip.

• Reinstall the nut and T-handle.

Attaching The Clutch Cable

Handle

Adjustment

Lock

NOTE: Do not overtighten control wire. Too much

tension may cause it to break.

Final Clutch Adjustment

IMPORTANT:

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
selection lever in NEUTRAL, start the engine. Refer
to Operation section.

Service the engine with oil and gasoline

Cable

Clip

Flange Lock Nut

Figure 8

• Route the clutch cable underneath the handle and
through the cable clip. Be careful not to bend or
kink the cable. Refer to Figure 8. Remove one hex
nut from the threaded casing on the end of the
cable. See Figure 9.

Hex

Nuts

Lock

Washer

Slot in

Cable

Bracket

Figure 9 Viewed beneath handle panel.

• 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.

• Pull the cable upwards to obtain slack, and, from
right to left, hook the “Z” end of the cable into the
bracket on the clutch control (beneath the handle
panel) as shown in Figure 9. Tighten the nut
against the cable bracket.

“Z” End
of Cable

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. See Figure 9. Tighten the upper hex nut
against the bracket.

• 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 control 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.

7

SECTION 3: KNOW YOUR TILLER

Gear Selection

Handle

Handle Height

Adjustment

Lock

Figure 10

Gear Selection Handle

The gear selection handle is located on the front of the
handle assembly (right hand 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 10.

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.

FORWARD Modes:

Wheels Forward— Forward wheel drive only.

Tines Reverse— Forward wheel drive and reverse tine

drive.

Handle

Adjustment

(Side to Side)

(Model 420 series

only)

Depth
Stake

Clutch

Handle

(Bail)

WARNING: Make certain unit is in
NEUTRAL when starting the engine.

Clutch Handle - (Bail)

The clutch handle (bail) is located beneath the handle.
See Figure 10. Squeezing the clutch handle against the
handle engages the wheel and tine drive mechanisms.

Throttle Control (All Engines)

The throttle control lever is located on the engine. It
controls the engine speed and stops the engine. See
Figure 11.

Choke Lever (Brigg & Stratton Standard and Intek Engines)

The choke lever is located by the throttle. It is used to
enrich the fuel mixture in the carburetor when starting a
cold engine. See Figure 11.

Primer Button (Tecumseh Engine Only)

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. See Figure 11.

Depth Stake

The depth stake controls the tilling depth. Refer to
‘‘Setting the Depth’’ on page 10.

Handle Adjustment (See Figure 10)

The handle may be adjusted to the height desired.
Loosen the handle height adjustment lock a few turns.
Pivot handle up or down to desired position. Tighten
lock.

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 (Briggs & Stratton Intek Engine if
equipped)

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.

8

SECTION 4: OPERATING YOUR TILLER

NOTE: Engine is shipped without oil.

Before Starting

• Service engine with oil as instructed in the
separate engine manual packed with your unit.

• Fill fuel tank with clean, fresh, lead-free.

To Start 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.

Briggs and Stratton Standard

• Place gear selection lever in NEUTRAL.

• Place the throttle control lever in FAST position.

See Figure 11.

• Move choke lever to CHOKE position.

NOTE: A warm engine may not require choking.

Run

Choke

Stop

Fast

• 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 steps 4 and 5 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.

Tecumseh Engines

• Place gear selection lever in NEUTRAL.

• Place the engine speed control in the START

position.

• Push primer two (2) or three (3) times (see Figure

11). Wait about two (2) seconds between each
push.

NOTE: Primer may not be needed to restart a warm
engine after a short shutdown.

• Stand at side of tiller. Grasp the starter handle and
pull out slowly, until it pulls slightly harder. Let rope
rewind slowly.

• Pull rope with a rapid full arm stroke. Do not allow
handle to snap back. Allow it to rewind slowly while
keeping a firm hold on the starter handle.

Briggs and Stratton Intek

Choke

Throttle Control

Briggs and Stratton Standard

Primer

Fast

Stop

Tecumseh

Figure 11

Fuel Shut-Off

Air

Cleaner

Throttle

Control

NOTE: If engine fails to start after three (3) pulls, push

primer two (2) times and pull starter rope again.

• Repeat steps 4 and 5 until engine starts. 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.

WARNING: When operating the tiller for
the first time, use the depth stake setting
that gives 1 inch of tilling depth (second
hole from the top). Refer to Figure 12.

9

Setting The Depth

Tilling depth is controlled by the depth stake which can
be adjusted to five different settings. See Figure 12.
Adjust the side shields as shown in Figure 13, as you
adjust the depth stake. Be certain spark plug wire is
disconnected and grounded against the engine.

• When using the tiller for the first time, use the
second adjustment hole from the top (1" of tilling
depth). See Figure 12.

Use This
Position

First Time

Clevis

Pin

Figure 12

Transport

Position

1"

Hairpin

3"

5"

7"

Clip

depth stake and side shields and make one or two
more passes over the area.

• When tilling loose soil, 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. See Figure 12. Move the depth stake to the
desired setting. Secure with the clevis pin and hairpin
clip.
To adjust the side shields, remove the wing nuts. See
Figure 13. Move the side shield to the desired position.
Replace the wing nuts. Tighten securely.

Operating the Tiller

• Select the depth stake setting.

• Start engine as instructed on page 9.

• 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. Refer to “Know Your Tiller”
section on page 8.

Use This

Hole for

Lowest (Shallowest)

Position

Highest (Deepest)

Figure 13

• 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

Side

Shields

Use This Hole for

Position

SECTION 5: MAKING ADJUSTMENTS

Handle Adjustment

The handle height may be adjusted. 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 adjustment on page 8 for details of handle
adjustment.

• 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.

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
turning, but the engine maintains the same speed.

10

To adjust the tension on the belt, refer to final clutch
adjustment in Assembly Instructions.

Carburetor Adjustment

WARNING: If any adjustments are made to
the engine while the engine is running,
(e.g. carburetor), disengage all clutches
and tines. Keep clear of all moving parts.

SECTION 6: SERVICE

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. Assemble the left half
to it. This grease can be obtained at your nearest
authorized dealer. Order part number 737-0300.

Be careful of heated surfaces and muffler.

Never make unnecessary adjustments. The factory
settings are correct for most applications. If
adjustments are needed, refer to the separate engine
manual packed with your tiller.

Clutch Handle—Lubricate the pivot point on the clutch
handle and the cable at least once a season 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.

Tine Shafts—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.

SECTION 7: 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:

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.

Never run your engine without air cleaner

Cleaning The 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:

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. Never inflate to over 30 p.s.i. to seat beads.

Never use a "pressure" washer to clean

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.

11

Belt Replacement

CAUTION: Do not use an off-the-shelf
belt.

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.

If belt replacement is required, order belt or belts by
part number from your nearest authorized dealer.

Part No. 754-0438—‘‘V’’ Belt

• Disconnect and ground the spark plug wire against
the engine.

• Remove the belt cover from the left side of the tiller
as follows:

• Remove two torx head screws from the top of belt
cover.

• Remove two hex cap nuts and flat washers from
front side of the belt cover. Remove the hex nut and
flat washer at the back of the cover.

• Remove the belt keeper assembly located behind
the engine pulley by removing two hex bolts and
lock washers. See Figure 14.

• Remove belt. Reassemble new belt, following
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 14.

Engine

Pulley

Belt

Keeper

Belt Keeper

Hex Bolts

Idler

Pulley

SECTION 8: 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.

Figure 14

• 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, especially any springs,
bearings and cables.

12

SECTION 9: TROUBLE SHOOTING GUIDE

Trouble Possible Cause(s) Corrective Action

Engine fails to
start

Engine runs
erratic

Engine over­heats

Tines do not
engage

Wheels do not
engage

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.
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.
Engine oil level low.
Dirty air cleaner.
Air flow restricted.
Carburetor not adjusted properly.
Foreign object lodged in tines.
Tine clevis pin(s) missing.
Pulley and idler not in correct
adjustment.
Not shifting properly.

Control cable not adjusted properly.
Belt worn and/or stretched.
Clevis pin missing.
Tiller is not being shifted properly.

Control cable not adjusted properly.
Belt worn and/or stretched.

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 to the engine manual packed with your unit.
Move switch to ON position.
Connect wire to spark plug.
Clean, adjust gap or replace.
Refer to the engine manual packed with your unit.
Move choke lever to OFF position.
Connect and tighten spark plug wire.
Clean fuel line; fill tank with clean, fresh gasoline. Fuel will
not last over thirty days unless a fuel stabilizer is used.
Clear vent.
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.
Fill crankcase with proper oil.
Refer to the engine manual packed with your unit.
Refer to the engine manual packed with your unit.
Adjust carburetor as instructed in separate engine manual.
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.
Replace clevis pin.
Refer to controls section of operator’s manual for proper
shifting procedures.
Adjust control cable (see assembly instructions).
Replace belt.

NOTE: For repairs beyond the minor adjustments above, contact your local authorized service dealer.

13

Models 410 Series

14

Models 410 Series

REF.

NO.

1 735-0246 Vinyl End Plug
2 647-0014 Clutch Control Ass’y.
3 710-1017 Torx Mach. AB-Tap Scr.

4 786-0131 Handle Cover
5 786-0098 Retaining Brkt.—R.H.
6 786-0118 Retaining Brkt.—L.H.
7 720-0278A Grip (2 Req’d.)
8 720-0210A Knob

9 712-3008 Hex Jam Nut 3/8-16 Thd.
11 735-0127 Rubber Washer
12 736-0204 Fl-Wash. .344" I.D. x .6" O.D.
13 747-0902 Gear Shift Rod
14 714-0104 Hairpin Clip
15 649-0017 Handle Ass’y.
16 710-0896 Tap Scr. 1/4-14 x 5/8" Lg.
17 726-0330 Cable Clip
21 746-0916 Clutch Cable
22 786-0120 Depth Bar
23 736-0117 Fl-Wash. 3/8" I.D. x 5/8" O.D.
24 710-0253 Hex Bolt 3/8-16 x 1" Lg.*
28 715-0120 Spiral Pin 3/16" x 1"
29 686-0095 Shift Crank Ass’y.
30 711-0415 Clevis Pin
31 714-0149B Hairpin Clip
32 642-0015 Tine Ass’y.—L.H.

PAR T

NO

642-0016 Tine Ass’y.—R.H. (Not Shown)

DESCRIPTION

1/4 x .62" Lg.

REF.

NO.

33 786-0090 Side Shield
34 786-0113 Rear Tine Shield
35 686-0044A End Cover Ass’y.
36 738-0849 Hex Cap Bolt 5/16-18 x 1.25"
38 710-0376 Hex Bolt 5/16-18 x .75" Lg.
39 710-3097 Carriage Bolt 3/8-16 x 1" Lg.
40 712-0798 Hex Ins. L-Nut 3/8-16 Thd.
43 712-3004A Hex Flange Top L-Nut

44 786-0076 Tine Shield Brkt.—R.H.
45 786-0077 Tine Shield Brkt.—L.H.
46 711-0415 Clevis Pin .375" Dia.
47 786-0085 Tine Shield
48 747-0432 Tiller Flap Rod
49 726-0106 Cap Speed Nut
50 710-0189 Hex Bolt 5/16-18 x 3" Lg.
51 786-0101B Shift Cover (410, 412 & 422)

52 710-1017 Torx Mach. AB-Tap Scr. 1/4 x
54 786-0109 Handle Brkt.—L.H.
55 786-0108 Handle Brkt.—R.H.
56 784-0191 Hex Nut Retainer Brkt.
57 712-0379 Hex Flange Nut 3/8-24 Thd.
58 750-0885 Spacer .322 Dia.
59 784-0190 Handle Adjustment Crank
60 712-0421 Knob 5/16-18 Thd.
61 736-0169 L-Washer 3/8" I.D.

PAR T

NO

786-0168 Shift Cover (415 & 417)

DESCRIPTION

5/16-18 Thd.

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.

15

Models 410 & 420 Series

REF.

NO. PART NO. DESCRIPTION

1 710-3008 Hex Bolt 5/16-18 x .75" Lg.

2 712-3004A Hex Top L-Nut 5/16-18 Thd.

3 786-0107 Cable Mtg. Bracket

4 710-1017 Torx Mach. AB-Tap Scr. 1/4 x .6" Lg

5 738-0899 Belt Cover Bolt

6 786-0117 Shift Cover Bracket

7 786-0100 Belt Cover

8 736-0142 Fl-Wash. .281" I.D. x .5" O.D.

9 712-0392 Hex Cap Nut 1/4-28 Thd.

10 756-0634 Flat Pulley 8" O.D.
11 736-0105 Bell-Wash. .38" I.D. x .88" O.D.
12 712-0379 Hex Flange Nut.
13 754-0438 “V”-Belt
14 686-0031A Belt Keeper Brkt.
15 736-0119 L-Wash. 5/16" I.D.
16 710-0237 Hex Bolt 5/16-24 x .62" Lg.
17 738-0876 Shld. Nut
18 712-0266 Hex Jam L-Nut 3/8-16 Thd.
19 756-0405 Fl-Idler w/Flanges
20 710-1039 Hex Bolt 3/8-24 x 1" Lg.
21 736-0217 L-Wash. 3/8" I.D.
22 736-0258 Fl-Wash. 3/8" I.D. x 1" O.D.
23 756-0972 Outer Engine Pulley Half

REF.

NO. PART NO. DESCRIPTION

24 756-0971 Inner Engine Pulley Half
25 786-0080 Idler Bracket
26 710-0723 Hex Bolt 3/8-16 x 1.25" Lg.
27 746-0916 Clutch Cable
28 734-0255 Air Valve
29 714-0104 Hairpin Clip
30 711-1017 Clevis Pin
31 634-0112 Rim Only (14")

634-0108 Rim Only (16")

32 634-0110 Wheel Ass’y. C om p . —R.H. (14")

634-0111 Wheel Ass’y. C o m p . —L.H. (14")
634-0106 Wheel Ass’y. C o m p . —R.H. (16")
634-0107 Wheel Ass’y. C o m p . —L.H. (16")
734-1796 Tire Only (14")

734-0808 Tire Only (16")
34 619-0009 Frame Counterweight
35 710-1007 Hex TT-Tap Scr. 3/8-16 Thd.
36 710-0376 Hex Bolt 5/16-18 x 1" Lg. (Gr. 5)
37 712-3004A Hex Flange L-Nut 5/16-18 Thd.
38 — Engine
41 686-0043A Tine Shield Brkt. Ass’y.
42 710-3038 Hex Bolt 5/16-18 x 7/8" Lg.
43 736-0256 Wash. Fl..635 I.D. x .930 O.D. x .03

16

Models 410 & 420 Series

REF.

NO. PART NO. DESCRIPTION

1 721-0295 Chain Case Gasket
2 786-0086 Reinforcement Plate
3 716-0865 Snap Ring
4 750-0938 Spacer .735" I.D. x .886" O.D.
5 611-0058 Wheel Shaft
6 717-1458 Spur Gear 46T
8 736-0351 Fl-Wash. .76" I.D. x 1.5" O.D.

9 721-0379 Shaft Seal
10 736-0518 Thr.Wash..445 I.D.x1.92 O.D.x
11 686-0039 Gear Case Ass’y. Ha l f —L.H.
12 750-0935 Spacer .635" I.D. x 1" O.D. x .78
13 738-0885 Jack Shaft 2.06" Lg.
14 750-0936 Spacer .635" I.D. x 1" O.D. x

.37" Thk.
15 617-0004 Gear Idler Ass’y.
16 712-3067 Hex Patch L-Nut 7/16-20 Thd.
17 736-0407 Bell-Wash. .45" I.D. x 1" O.D.
18 712-0378 Hex Nut 7/16-20 Thd.
19 710-0896 Hex Wash. Hd. TT-Tap Scr. 1/4-20

x .5" Lg.
20 732-0863 Spring Detent
21 741-0862 Ball Detent
22 721-0378 Shaft Seal
23 736-0163 Thrust Wash. 1.03" I.D. x 1.62"
24 750-0570 Spacer 1" I.D. x 2" O.D. x .5" Thk.
26 611-0021 Tine Shaft Ass’y.
27 713-0226 Chain #50 5/8" Pitch x 52

Links—Endless

28 713-0233 Chain—#41 1/2" Pitch x 30

Links—Endless

29 686-0038 Gear Case Ass’y. Ha l f —R.H.

REF.

NO. PART NO. DESCRIPTION

30 736-0541 Fl-Wash. 7/16" I.D. x 1-3/8" O.D.
31 617-0002 Gear and Sprocket Ass’y.
32 738-0884 Jack Shaft 5" Lg.
33 750-0931 Spacer .636" I.D. x .86" O.D.
35 717-1411 Spur Gear 10T
36 750-0930 Spacer 1.5" I.D. x 1.76" O.D.
37 713-0436 Sprocket—#41 Chain
38 717-1405 Reverse Gear 46T
39 736-0518 Thrust Wash. .445" I.D. x 1.92"
40 618-0245B Shifter Ass’y.
41 717-1409 Spur Gear 17T
42 736-0442 Fl-Wash. .69" I.D. x 1.06" O.D.
43 732-0614 Wire Ring
44 718-0234 Clutch Collar
45 716-0235 Retaining Ring .875" Shaft
46 711-1087 Drive Shaft
47 713-0435 Sprocket 11T
49 717-1451A Spur Gear 16T
50 736-0336 Fl-Wash. 5/8" I.D. x 1" O.D.
51 741-0124 Ball Bearing .669" I.D.
52 736-0329 L-Wash. 1/4" I.D.
53 710-0258 Hex Bolt 1/4-20 x .62" Lg.
55 741-0563 Ball Bearing
56 736-0512 Fl-Wash. .281" I.D. x .875" O.D.
57 686-0094 Gear Case Ass’y. C o mp.
58 718-0237 Key—Drive Shaft (Not Shown)
59 736-0265 Fl-Wash. .88" I.D. x 1.5" O.D.
60 726-0331 Button Plug
61 750-0987 Spacer 1.52" I.D.

— 737-0300 Grease (40 oz. Req’d.)

17

Model 420 Series

18

Model 420 Series

REF.

NO. PART NO. DESCRIPTION

1 735-0246 Vinyl End Plug
2 647-0014 Clutch Control Ass’y.
3 710-1017 Torx Mach. AB-Tap Scr.
4 786-0131 Handle Cover
5 786-0098 Retaining Brkt.—R.H.
6 786-0118 Retaining Brkt.—L.H.
7 720-0278A Grip (2 Req’d.)
8 720-0210A Knob

9 712-3008 Hex Jam Nut 3/8-16 Thd.
11 735-0127 Rubber Washer
12 736-0204 Fl-Wash. .344" I.D. x .6" O.D.
13 747-0902 Gear Shift Rod
14 714-0104 Hairpin Clip
15 649-0016 Handle Ass’y.
16 710-0896 Tap Scr. 1/4-14 x 5/8" Lg.
17 726-0330 Cable Clip
21 746-0916 Clutch Cable
22 786-0120 Depth Bar
23 736-0117 Fl-Wash. 3/8" I.D. x 5/8" O.D.
24 710-0514 Hex Bolt 3/8-16 x 1" Lg.*
28 715-0120 Spiral Pin 3/16" x 1"
29 686-0095 Shift Crank Ass’y.
30 711-0415 Clevis Pin
31 714-0149B Hairpin Clip
32 642-0015 Tine Ass’y.—L.H.

642-0016 Tine Ass’y.—R.H. (Not Shown)
33 786-0090 Side Shield
34 786-0113 Rear Tine Shield
35 686-0044A End Cover Ass’y.
36 738-0849 Hex Screw 5/16-18 x .75" Lg.

REF.

NO. PART NO. DESCRIPTION

38 710-3008 Hex Bolt 5/16-18 x .75" Lg.
39 710-3097 Carriage Bolt 3/8-16 x 1" Lg.
40 712-0798 Hex Nut 3/8-16 Thd.
43 712-3004A Hex Fl. Tp. L-Nut 5/16-18 Thd.
44 786-0076 Tine Shield Brkt.—R.H.
45 786-0077 Tine Shield Brkt.—L.H.
46 711-0415 Clevis Pin .375" Dia.
47 786-0085 Tine Shield
48 747-0432 Tiller Flap Rod
49 726-0106 Cap Speed Nut
50 710-0521 Hex Bolt 3/8-16 x 3" Lg.
51 786-0101B Shift Cover
52 710-1017 Torx Mach. AB-Tap Scr.

1/4 x .6"
54 686-0071 Handle Positioner Brkt. Ass’y.
55 686-0048 Handle Pivot Brkt. Ass’y.
56 784-0191 Hex Nut Retainer Brkt.
57 712-0379 Hex Flange Nut 3/8-24 Thd.
59 784-0190 Handle Adjustment Crank
60 710-0189 Hex Bolt 5/16-18 x 3" Lg.
61 732-0493 Torsion Spring
62 712-0375 Hex L-Nut 3/8-16 Thd.
63 748-0375 Handle Swing Link
64 736-0317 Bell-Wash. 5/8" I.D.
65 712-0386A Hex Slotted Nut 5/8-18 Thd.
66 714-3021 Cotter Pin 1/8" x 1-5/8"
67 747-0901 Handle Adjustment Rod
68 712-0421 Knob 5/16-18 Thd.
69 736-0169 L-Washer 3/8" I.D.

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.

19

MANUFACTURER’S LIMITED WARRANTY FOR:

The limited warranty set forth below is given by MTD
PRODUCTS INC (“MTD”) with respect to new merchan­dise purchased and used in the United States, its posses­sions and territories.

MTD warrants this product against defects in material and
workmanship 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
material 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 use, neglect, accident, improper maintenance,
alteration, vandalism, 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 Products Inc. for use with the product(s)
covered by this manual will void your warranty as to any
resulting damages.

Normal wear parts or components thereof are subject to
separate terms as follows: All normal wear part 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 material or workmanship of
OTHER component parts. Normal wear parts and compo­nents include, but are not limited to, belts, blades, blade
adapters, grass bags, rider deck wheels, seats, snow
thrower skid shoes, shave plates and tires. Batteries are
covered by a 90-day limited replacement warranty.

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, please check for a listing in the Yellow
Pages or contact the Customer Service Department of
MTD PRODUCTS INC by calling 1-800-800-7310 or writ­ing to P.O. Box 368022, Cleveland, Ohio 44136-9722.

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 warranty. Please
refer to the applicable manufacturer’s warranty on
these items.

b. Log splitter pumps, valves and cylinders have a sepa-

rate one year warranty.

c. Routine maintenance items such as lubricants, filters,

blade sharpening and tune-ups, or adjustments such
as brake adjustments, clutch adjustments or deck
adjustments; and normal deterioration of the exterior
finish due to use or exposure.

d. MTD does not extend any warranty for products sold

or exported outside of the United States of America,
its possessions and territories, except those sold
through MTD’s authorized channels of export distribu­tion.

No implied warranty, including any implied warranty of
merchantability or fitness for a particular purpose,
applies after the applicable period of express written
warranty above as to the parts as identified. No other
express warranty or guaranty, 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. During the period of the War­ranty, the exclusive remedy is repair or replacement of
the product as set forth above. (Some states do not

allow limitations on how long an implied warranty lasts, so
the above limitation may not apply to you.)

The provisions as set forth in this Warranty provide the
sole and exclusive remedy arising from the sales. MTD
shall not be liable for incidental or consequential loss
or damages including, without limitation, expenses
incurred for substitute or replacement lawn care ser­vices, for transportation or for related expenses, or for
rental expenses to temporarily replace a warranted
product. (Some states do not allow the exclusion or limita-

tion of incidental or consequential damages, so the above
exclusion or limitation 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 the 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 use or misuse or inability to use
the product.

This limited warranty shall not extend to anyone other than
the original purchaser, original lessee or 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.