Yard Machines 420, 410 User Manual

OPERATOR’S MANUAL

REAR TINE

TILLER

Models

410 Thru 420

IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY

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

covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting
applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.
In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have
similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized
service dealer or contact the service department, P.O. Box 368022 Cleveland, Ohio 44136-9722.

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

PRINTED IN U.S.A. FORM NO. 770-8879A

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.

1. 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.

2

• 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.

2. 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.

3. 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.

• 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.

Figure 1 Safety labels found on your unit

3

SECTION 2: FINDING YOUR MODEL NUMBER

This Operator’s Manual is an important part of your new tiller. It will help you assemble, prepare and maintain
your tiller. Please read and understand what it says.
Before you start to prepare your tiller for its first use, please locate the model plate and copy the information
from it in this Operators Manual. The information on the model plate is very important if you need help from
your dealer or the MTD customer support department.

• Every tiller has a model plate. You can locate it by standing in the operating position behind the unit
and looking down at the center of the rear tine cover.

• The model plate will look like Figure 2.

This is where your model number will be.

XXX-X-XXX-X-XXX XXXXXXXXXXX

This is where your serial number will be.

Copy the model number here:

MTD PRODUCTS INC

CLEVELAND , OHIO 44136

Copy the serial number here:

Figure 2

SECTION 3: CALLING CUSTOMER SUPPORT

If you are having difficulty assembling this product or if you have any question regarding the controls,
operation or maintenance of this unit, please call the Customer Support Department. You can reach them by
calling:

1-800-800-7310

Before you call, make sure that you have both your model and serial number ready. By having the model and
serial number ready, you help the Customer Support Representative give you faster service. To find your
units model and serial number, see SECTION 2: FINDING YOUR MODEL NUMBER.

SECTION 4: UNPACKING

TO REMOVE UNIT FROM CARTON

1. Remove staples, break glue on top flaps, or cut
tape at carton end and peel along top flap to
open carton.

2. Remove loose parts included with unit (i.e.,
owner’s manual, etc.).

3. Cut along dotted lines and lay carton down flat.

4. Remove packing material.

5. Roll or slide unit out of carton. Check carton
thoroughly for loose parts.

6. 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.

This unit is shipped WITHOUT

4

SECTION 5: ASSEMBLY INSTRUCTIONS

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

NOTE:

operator’s position, standing behind the tiller.

Left and right is determined from the

TOOLS REQUIRED FOR ASSEMBLY

(2) 1/2" Wrenches*
(1) 9/16" Wrench*
(1) Pair of Pliers
*Two adjustable wrenches may be used.

LOOSE PARTS IN CARTON

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

NOTE:

attached to the loose parts or the tiller.

All hardware needed for assembly is

ATTACHING THE DEPTH STAKE
ASSEMBLY

T-Knob, Flat Washer, Hex Bolt

1. Tip the tiller forward so it rests on front

2. Unthread the “T” knob from the top of the depth

3. Raise the tine shield hinge flap assembly. Insert

4. Insert clevis pin through the tine shield and

5. Insert hex bolt into the top hole of the depth

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

Attaching the Handle Assembly

1. Remove the Handle Adjustment Lock, Flange

2. Place the handle assembly in position in the

counterweight.

stake, and remove the flat washer and hex bolt.
Remove the hairpin clip from the clevis pin. See
Figure 3.

the depth stake assembly in the slot (under the
tine shield) and up through the tine shield
assembly as shown in Figure 3.

depth stake assemblies. Secure with hairpin clip.

stake assembly. Place flat washer on the hex
bolt and thread “T” knob onto the hex bolt. See
Figure 3. Tighten securely.

Nut Retainer Bracket, Shoulder Bolt and Lock
Nut from the Pivot Bracket.

handle pivot bracket lining the upper holes in
the handle with the slots in the pivot bracket.
See Figure 4.

Tine Shield

Hinge Flap

Clevis Pin

Hairpin Clip

Depth Stake

Figure 3

Flange Nut Retainer Bracket

Shoulder Bolt

Handle Adjustment

Lock

Flange Nut

Pivot Bracket

3. 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 and retainer bracket
should be to the right hand side of the unit. See
Figure 5.

Lock Nut

Figure 4

5

Flange Nut Retainer Bracket

Shoulder Bolt

Lock Nut

Lift up
Handle

Figure 5

4. Place the hex opening of the hex nut retainer
bracket over the flange nut securing the handle
adjustment lock and install the lock nut on the
lower shoulder bolt. See Figure 6.

Hex Hole in
Retainer Bracket
over Flange Nut

Handle Adjustment

Lock

T-Handles

Gear Shift

Rod

Shift Cover

Handle

Adjustment Rod

(Model 420 Only)

Figure 7

Gear Shift Rod

Opening

Rubber Washer

Flat Washer
Hairpin Clip

Figure 6

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

ATTACHING THE GEAR SHIFT ROD
NOTE:

gear shift rod is the longer rod.

1. Remove the T-handle, nut, hairpin clip, flat

2. Insert the end of the gear shift rod through the

Model 420 tiller has two control rods. The

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). See
Figure 7.

opening in the top of the shift cover, and into
the shift bracket. See Figure 8. Secure with
rubber washer first, then flat washer and hairpin
clip.

Figure 8

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

A TTACHING THE HANDLE ADJUSTMENT
ROD

(Model 420 Only)

Handle

Adjustment

Rod

Positioner

Bracket

Rubber
Washer

Figure 9

Hairpin

Clip

6

1. 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 7.

2. 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 9. Secure with hairpin clip.

3. Reinstall the nut and T-handle.

ATTACHING THE CLUTCH CABLE

Handle

Adjustment

Lock

Cable

Clip

Flange Lock Nut

Figure 10

1. Route the clutch cable underneath the handle
and through the cable clip. Be careful not to
bend or kink the cable. Refer to Figure 10.
Remove one hex nut from the threaded casing
on the end of the cable. See Figure 11.

Hex

Nuts

3. 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 11.
Tighten the nut against the cable bracket.

NOTE: Do not overtighten control wire. 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.

1. 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.

NOTE: Keep hands out of belt area while unit is

operating.

2. 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 11.
Tighten the upper hex nut against the bracket.

3. 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.

4. 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.

Lock

Washer

Slot in

Cable

Bracket

Figure 11 Viewed beneath handle panel.

2. 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.

“Z” End
of Cable

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:

under any circumstances is 30 p.s.i.
Equal tire pressure should be
maintained on both tires.

7

Maximum tire pressure

SECTION 6: CONTROLS

Gear Selection

Handle

Handle Height

Adjustment

Lock

Figure 12

Handle

Adjustment

(Side to Side)

(Model 420 Only)

Depth

Stake

Clutch

Handle

(Bail)

GEAR SELECTION HANDLE

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

420). 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 12.

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.

WARNING:

NEUTRAL when starting the engine.

Make certain unit is in

CLUTCH HANDLE - (Bail)

The clutch handle (bail) is located beneath the
handle. See Figure 12. Squeezing the clutch handle
against the handle engages the wheel and tine drive
mechanisms.

THROTTLE CONTROL

The throttle control lever is located on the engine. It
controls the engine speed and stops the engine.
See Figure 13.

CHOKE LEVER (Model 410/420)

The choke lever is located above the throttle. It is
used to enrich the fuel mixture in the carburetor
when starting a cold engine. See Figure 13.

PRIMER BUTTON (Model 415)

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 13.

DEPTH STAKE

The depth stake controls the tilling depth. Refer to
‘‘How to Use Your Tiller’’ section on page 10.

HANDLE ADJUSTMENT

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, 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.

(See Figure 12)

8

SECTION 7: OPERATION

NOTE: Engine is shipped without oil.

BEFORE STARTING

Service engine with oil as instructed in the

separate engine manual packed with your unit.

2. Fill fuel tank with clean, fresh, lead-free, low­lead or regular grade leaded gasoline.

TO START ENGINE

NOTE: When pushing the unit with the engine off,

you will hear a ratcheting sound (gear noise) which
is normal.

WARNING:

standing in front of the tiller while the
engine is running or being started.

Model 410/420

1. Place gear selection lever in NEUTRAL.

2. Place the throttle control lever in FAST position.
See Figure 13.

3. Move choke lever to CHOKE position.

NOTE: A warm engine may not require choking.

Choke

Throttle Control

Primer

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

Be sure no one is

Model 410/420

Air

Cleaner

Fast

Stop

Model 415

Figure 13

Throttle

1.

5. 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.

6. Repeat steps 4 and 5 until engine starts.

7. 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.

Model 415

1. Place gear selection lever in NEUTRAL.

2. Place the engine speed control in the START
position.

3. Push primer two (2) or three (3) times (see
Figure 13). Wait about two (2) seconds between
each push.

NOTE: Primer may be needed to restart a warm

engine after a short shutdown.

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

5. 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.

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

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

6. 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

1. Move throttle control to STOP or OFF position.

2. 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.

9

SECTION 8: HOW TO USE YOUR TILLER

WARNING:

for the first time, use the depth stake
setting that gives 1 inch of tilling depth
(second hole from the top). Refer to
Figure 14.

Tilling depth is controlled by the depth stake which
can be adjusted to five different settings. See Figure

14. Adjust the side shields as shown in Figure 15,
as you adjust the depth stake. Be certain spark plug
wire is disconnected and grounded against the
engine.

1. When using the tiller for the first time, use the
second adjustment hole from the top (1" of
tilling depth). See Figure 14.

Use This

Position

First Time

Use This

Hole for

Lowest (Shallowest)

Position

2. 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 make one or two more passes over
the area.

When operating the tiller

T ransport

Position

1"

Clevis

Pin

Figure 14

Highest (Deepest)

Figure 15

3"

5"
7"

Side

Shields

Use This Hole for

Position

Hairpin

Clip

3. 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.

4. 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 14. Move the depth stake to

Secure with the clevis pin and

the desired setting
hairpin clip.
To adjust the side shields, remove the wing nuts.
See Figure 15. Move the side shield to the desired
position. Replace the wing nuts. Tighten securely.

To operate the tiller:

1. Select the depth stake setting.

2. Start engine as instructed on page 9.

3. Move gear selection handle to one of the
forward modes or reverse.

WARNING:

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 “Controls” section on page 8.

4. 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:

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.

.

Do not move the gear

Do not push down on the

10

SECTION 9: ADJUSTMENTS

HANDLE ADJUSTMENT

The handle height may be adjusted. On Model 420,
the handle may also be adjusted to be in line with
the tiller, or swung to the left or right. Refer to the
Control section for details of handle adjustment.

BEL T 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.

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

SECTION 10: 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.
Assemble the left half to it. This grease can be
obtained at your nearest authorized dealer. Order
part number 737-0300.

CARBURETOR ADJUSTMENT

WARNING:

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

If any adjustments are

SECTION 11: MAINTENANCE

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.

CLEANING THE TINE AREA

Clean the underside of the tine shield after each
use. The dirt washes off the tines easier if washed
off immediately instead of after it dries.

11

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.

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.

BELT REPLACEMENT

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

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.

3. Remove the belt keeper assembly located
behind the engine pulley by removing two hex
bolts and lock washers. See Figure 16.

4. 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 16.

Engine

Pulley

Belt Keeper

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

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

2. Remove the belt cover from the left side of the
tiller as follows.

SECTION 12: 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.

1. Clean the exterior of engine and the entire tiller
thoroughly. Lubricate the tiller as described in
the lubrication instructions.

2. Refer to the engine manual for correct engine
storage instructions.

Hex Bolts

Belt

Keeper

3. Wipe tines with oiled rag to prevent rust.

4. Store tiller in a clean, dry area. Do not store
next to corrosive materials, such as fertilizer.

Idler

Pulley

Figure 16

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 13: 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 410-415

14

Models 410-415

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.
7 720-0278 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.

PART

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 N End Cover Ass’y.
36 738-0849 Hex Cap Bolt 5/16-18 x 1.25"
38 710-3002 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.
51 786-0101A N Shift Cover (410/420)

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.

PART

NO

5/16-18 Thd.

786-0168 Shift Cover (415)

DESCRIPTION

15

Models 410, 415, 420

REF.

NO. PART NO. DESCRIPTION

1 710-0118 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
14 686-0031 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
20 710-0152 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 Valv e
29 714-0104 Hairpin Clip
30 711-1017 Clevis Pin
31 634-0112 Rim Only (410)

634-0108 Rim Only (420)

32 634-0110 Wheel Ass’y. Comp.—R.H. (410)

634-0111 Wheel Ass’y. Comp.—L.H. (410)
634-0106 Wheel Ass’y. Comp.—R.H. (420)
634-0107 Wheel Ass’y. Comp.—L.H. (420)
734-1796 Tire Only (410)

734-0808 Tire Only (420)
34 619-0009 Frame Counterweight
35 710-1007 Hex TT-Tap Scr. 3/8-16 Thd.
36 710-3002 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, 415, 420

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 .060
11 686-0039 Gear Case Ass’y. Half—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. Half—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"
40 618-0245A N 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 N 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. Comp.
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

18

Model 420

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.
7 720-0278 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.
24 710-0253 Hex Bolt 3/8-16 x 1" Lg.*
28 715-0120 Spiral Pin 3/16" x 1"
29 686-0095 N 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 N End Cover Ass’y.
36 738-0849 Hex Screw 5/16-18 x .75" Lg.

REF.

NO. PART NO. DESCRIPTION

38 710-0118 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.
51 786-0101A N 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.

19

MANUFACTURER’S LIMITED WARRANTY FOR:

For TWO YEARS from the date of retail purchase
within the United States of America, its possessions
and territories, MTD PRODUCTS INC will, at its
option, repair or replace, for the original purchaser,
free of charge, any part or parts found to be
defective in material or workmanship. This warranty
covers units which have been operated and
maintained in accordance with the operating
instructions furnished with the unit, and which have
not been subject to misuse, abuse, commercial use,
neglect, accident, improper maintenance or
alteration.

Normal wear parts or components thereof are
subject to separate terms as noted below in the “No
Fault Ninety Day Consumer Warranty” clause.

All normal wear part failures will be covered on this
product for a period of 90 days regardless of cause.
After 90 days, but within the two year period, normal
wear parts failures will be covered ONLY IF caused
by defects in material or workmanship of OTHER
component parts. Normal wear parts are defined as
batteries*, belts, blades, blade adapters, grass
bags, rider deck wheels, seats, snow thrower skid
shoes, shave plates and 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, please check the yellow pages or contact
the Customer Service Department of MTD
PRODUCTS INC, P. O. Box 368022, Cleveland,
Ohio 44136-9722. Phone [phone]. The
return of a complete unit will not be accepted by the
factory unless prior written permission has been
extended by the Customer Service Department of
MTD PRODUCTS INC.

Transportation charges: Transportation charges
for the movement of any power equipment unit or
attachment are the responsibility of the purchaser.

Units exported out of the United States: MTD
PRODUCTS INC 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 PRODUCTS INC’s
authorized channels of export distribution.

Other Warranties:

1. The engine or component parts thereof carry
separate warranties from their manufacturers.
Please refer to the applicable manufacturer’s
warranty on these items.

2. *Batteries are covered by a 90-day replacement
warranty.

3. Log splitter pumps, valves and cylinders or
component parts thereof are covered by a one
year warranty.

4. All other warranties, express or implied,
including any implied warranty of
merchantability or fitness for a particular
purpose, are hereby expressly disclaimed in
their entirety.

5. The provisions as set forth in this warranty
provide the sole and exclusive remedy of MTD
PRODUCTS INC’s obligations arising from the
sales of its products. MTD PRODUCTS INC will
not be liable for incidental or consequential loss
or damage.

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. Certain disclaimers are not allowed in
some states and therefore they may not apply to
you under all circumstances.

NOTE: This warranty does not cover routine
maintenance items such as lubricants, filters, blade
sharpening and tune-ups, or adjustments such as
brake adjustments, clutch adjustments or deck
adjustments. Nor does this warranty cover normal
deterioration of the exterior finish due to use or
exposure.