Operator’s Manual
Front Tine
Cultivator
Model
21A-120R000
IMPORTANT: Read safety rules and instructions carefully before operating equipment.
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 arrestor for the muffler is available through your nearest engine authorized
service dealer or contact the service department, 550 N. 54th Street, Chandler, Arizona 85226-2434.
MTD SOUTHWEST INC 550 N. 54TH STREET, CHANDLER, ARIZONA 85226-2434
PRINTED IN U.S.A.
FORM NO. 770-10456
(11/00)
PART NO. 10120 rev. A
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SECTION 1: IMPORTANT SAFE OPERATION PRACTICES
This Symbol Points Out Important Safety Information 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 Cultivator. Failure To Comply With These Instructions
May Result In Personal Injury. When You See This Symbol–Heed Its Warning.
DANGER: Your cultivator 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 personal injury. This cultivator is capable of amputating hands and feet. Failure to
observe the following instructions could result in serious injury or death.
WARNING: Engine Exhaust, some of its constituents, and certain vehicle components contain or emit
chemicals known to State of California to cause cancer and birth defects or other reproductive harm.
•
•
Be sure the tines are not in contact with anything
before starting the unit.
Avoid accidental starting. Be in the starting
position whenever pulling the starter rope. The
operator and unit must be in a stable position while
starting. See Operating Your Cultivator.
Use the right tool. Only use this tool for the
purpose intended.
Use extreme caution when reversing or pulling the
unit towards you.
Do not overreach, take extra care when working on
steep slopes or inclines. Always keep proper foot-
ing and balance.
Always hold the unit with both hands when
operating. Keep a firm grip on the handlebar grips.
Keep hands, face, and feet at a distance from all
moving parts. Do not touch or try to stop the tines
when they are rotating. Do not operate without
guards in place.
Do not touch the engine, muffler or gearbox. These
parts get extremely hot from operation. When
turned off they remain hot for a short time.
Do not operate the engine faster than the speed
needed to do the job. Do not run the engine at high
speed when not in use.
Always stop the engine when operation is delayed
or when walking from one location to another.
GENERAL OPERATION
•
•
•
•
•
Read the instructions carefully. Be familiar with the
controls and proper use of the unit.
Do not operate this unit when tired, ill, or under the
influence of alcohol, drugs, or medication.
Children and teens under the age of 15 must not
use the unit, except for teens guided by an adult.
All guards and safety attachments must be installed
properly before operating the unit.
Inspect the unit before use. Replace damaged
parts. Check for fuel leaks. Make sure all fasteners
are in place and secure. Replace parts that are
cracked, chipped, or damaged in any way. Do not
operate the unit with loose or damaged parts.
•
•
•
•
•
•
•
Carefully inspect the area before starting the unit.
Remove all debris and hard or sharp objects such
as glass, wire, etc.
Clear the area of children, bystanders, and pets.
At a minimum, keep all children, bystanders and
pets outside a 50 feet (15 m) radius; there still may
be a risk to bystanders from thrown objects.
Bystanders should wear eye protection. If you are
approached, stop the unit immediately.
•
•
•
•
Squeeze the throttle control and check that it
returns automatically to the idle position. Make all
adjustments or repairs before using unit.
Never start or run the unit inside a closed room or
building. Breathing exhaust fumes can kill. Operate
this unit only in a well ventilated area
outdoors.
•
•
Do not force unit. It will do the job better and with
less likelihood of injury at a rate for which it was
designed.
•
Wear safety glasses or goggles that are marked as
meeting ANSI Z87.1 standards, and ear/hearing
protection when operating this unit. Wear a face or
dust mask if the operation is dusty.
Wear heavy, long pants, boots, gloves and long
sleeve shirt. Do not wear, short pants, sandals or
go barefoot.
To reduce the risk of injury associated with objects
being drawn into rotating parts, do not wear loose
clothing, jewelry, scarves, etc. Secure hair above
shoulder level.
Use the unit only in daylight or good artificial light.
Keep outside surfaces free from oil and fuel.
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 15 to
operate the cultivator.
•
•
3
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•
Use only replacement parts and accessories
approved by the manufacturer for this unit. These
are available from your authorized service dealer.
Use of any non approved parts or accessories
could lead to serious injury to the user, or damage
to the unit, and void your warranty.
This unit has a clutch. The tines remain stationary
when the engine is idling. If they do not, have the
unit adjusted by an authorized service technician.
Keep unit clean of vegetation and other materials.
They may become lodged between the tines and
gearbox or guard.
To reduce fire hazard, replace faulty muffler and
spark arrestor, keep the engine and muffler free
from grass, leaves, excessive grease or carbon
build up.
Never store the unit, with fuel in the tank, inside a
building where fumes may reach an open flame or
spark.
Allow the engine to cool before storing or transport-
ing. Be sure to secure the unit while transporting.
Store the unit in a dry place, either locked up or up
high to prevent unauthorized use or damage.
Keep out of the reach of children.
SERVICE
•
Use extreme care in handling gasoline and other
fuels. They are extremely flammable and the vapors
are explosive.
•
•
•
Store fuel only in containers specifically designed
and approved for the storage of such materials.
Avoid creating a source of ignition for spilled fuel.
Do not start the engine until fuel vapors dissipate.
Always stop the engine and allow it to cool before
filling the fuel tank. Never remove the cap of the
fuel tank, or add fuel, when the engine is hot. Never
operate the unit without the fuel cap securely in
place. Loosen the fuel tank cap slowly to relieve
any pressure in the tank.
•
•
•
•
•
Mix and add fuel in a clean, well-ventilated area
outdoors where there are no sparks or flames.
Slowly remove the fuel cap only after stopping
engine. Do not smoke while fueling or mixing fuel.
Wipe up any spilled fuel from the unit immediately.
Move the unit at least 30 feet (9.1 m) from the fuel-
ing source and site before starting the engine. Do
not smoke, keep sparks and open flames from the
area while adding fuel or operating the unit.
•
•
•
•
•
Stop the engine for maintenance, repair, to install or
remove the tines. The unit must be stopped and
the tines no longer turning to avoid injury.
The tines become very sharp from use. Always
wear heavy gloves when handling, removing,
installing or cleaning the tines.
•
•
Clean the tines with a hose and water. Wipe the
tines with a light machine oil to prevent rust.
Never douse or squirt the engine with water or any
other liquid. Keep handles dry, clean and free from
debris. Clean after each use, see Off-Season
Storage.
•
Keep these instructions. Refer to them often and
use them to instruct other users. If you loan some-
one this unit, also loan them these instructions.
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.
•
WARNING - READ OPERATOR'S MANUAL
Read the Operator’s Manual(s) and follow all warnings and safety instructions.
Failure to do so can result in serious injury to the operator and/or bystanders.
•
WEAR EYE AND HEARING PROTECTION
Thrown objects and loud noise can cause severe eye injury and hearing loss. Wear eye protection
meeting ANSI Z87.1 standards and ear protection when operating this unit.
•
KEEP BYSTANDERS AWAY
Keep all bystanders, especially children and pets, at least 50 feet (15 m) from the operating area.
THROWN OBJECTS CAN CAUSE SEVERE INJURY
Do not operate unit without proper attachments and guards in place.
HOT SURFACE WARNING
•
•
Do not touch a hot muffler, cylinder or gearbox. You may get burned. These parts get extremely hot
from operation. When turned off they remain hot for a short time.
•
CULTIVATORS – ROTATING TINES CAN CAUSE SEVERE INJURY
Stop the engine and allow the tines to stop before installing or removing tines, or before cleaning or
performing any maintenance. Keep hands and feet away from rotating tines.
4
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SECTION 2: ASSEMBLING YOUR CULTIVATOR
Your yard and garden cultivator has been completely
SETTING UP YOUR CULTIVATOR
assembled except for the handlebar, throttle cable
and wheel bracket assembly. A large phillips
screwdriver is needed for assembly.
Installing The Wheel Bracket Assembly
WARNING: To avoid injury from the tines,
wear heavy gloves and a long sleeve
shirt when installing the wheel bracket
assembly.
Removing Unit From Carton
1. Carefully unpack the contents and insure that
nothing is damaged. Unwrap the throttle cable
without bending or kinking it.
1. With the unit on it’s side, place the wheel bracket
assembly on the underside of the tine guard. See
Figure 2.
WARNING: Do not cut the plastic strap
off the handle bar. The strap is under
tension and can cause serious personal
injury if cut.
2. Install a carriage bolt through each of the slotted
holes in the wheel bracket and into the tine
guard.
2. Squeeze the handle bar and slide the plastic
strap down and off. See Figure 1.
3. On the top side of the tine guard, install a lock
washer and a wing nut onto each of the bolts.
See Figure 2.
NOTE: Do not squeeze the handlebar too tight.
Excessive squeezing can cause the handlebar to kink.
4. Make sure the square shoulder of the bolts are
through the slotted holes in the wheel bracket.
Tighten the wing nuts. See Figure 3.
Squeeze
Together
NOTE: Do not over tighten the wing nuts. Loosening
the wing nuts allow the wheel height to be adjusted.
Wheel
Bracket
Assembly
Tine
Plastic
Strap
Guard
Wing Nut &
Lock Washer
Figure 2
Figure 1
Figure 3
5
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Installing The Handlebar
Bottom
Clamp
1. Position the mounting brackets by rotating them
until the foot on the bracket rests against the
engine. See Figure 4.
Nut (4)
Screw (4)
2. Place the handlebar between the bottom and
middle clamp pieces. See Figure 5.
3. While holding the three pieces together, position
the handlebar underneath the shaft tube and align
with the top clamp.
Top
Clamp
NOTE: The holes in the clamp assembly will line up
only when assembled correctly.
Middle
Clamp
Handlebar
4. One at a time, hold a hex nut in the bottom clamp
recess with a finger and install a screw through
the clamp assembly. Start screw with a large
Phillips screwdriver. do the same with the other
three (3) nuts and screws. Do not tighten until you
make the handle adjustment.
Figure 5
5. Position the two (2) handlebar clamps with one on
each side near the top of the handlebar. Swing the
handlebar up until it sets to the outside of the two
mounting brackets on the engine. See Figure 6.
NOTE: Positioning the handlebar onto the mounting
brackets may require slightly spreading the handlebar.
Mounting
Bracket
Handlebar
6. Slide the two (2) handlebar clamps down over the
mounting brackets. See Figure 7.
Figure 6
Handlebar Clamp
NOTE: It may be required to loosen or remove the
thumb screws on the handlebar clamps to spread
them to fit over the mounting brackets.
Thumb
Screw
7. Center the handlebar and tighten the two (2)
mounting bracket clamps and the four (4)
handlebar clamp screws evenly until the
handlebar is secure. See Figures 7 and 8.
Mounting Brackets
Mounting
Bracket
Nut
Handlebar
Spacer
Foot
Foot
Figure 7
Figure 4
Figure 8
6
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Throttle Cable Assembly
1. Wrap the throttle wire once around the handlebar.
See Figure 9.
2. Depress the throttle trigger and locate hole for the
throttle wire. See Figure 10.
3. With the throttle trigger depressed, place the bar-
rel end of the throttle wire inside the hole of the
trigger. See Figure 11.
4. Release the throttle trigger and guide the cable
up into the slot of the trigger housing.
Throttle Wire Hole
5. Push the throttle cable housing into the trigger
housing until it snaps into place. See Figure 12.
Figure 10
6. Route the throttle cable through the clip on the
right handlebar mounting bracket. See Figure 13.
NOTE: Ensure the throttle cable is fitting into the
guide at the carburetor plate on the engine. If it does
not, the throttle will not work properly. See Figure 9.
Throttle
Wire Slot
Carburetor
Plate Guide
Figure 11
Throttle Cable
Figure 12
Throttle
Cable
Figure 9
Engine
Mounting
Bracket
Figure 13
7
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SECTION 3: KNOW YOUR CULTIVATOR
START/ON (I)
On/Off Stop
Control
Throttle
Control
Choke Control
Primer Bulb
STOP/OFF (O)
Air Filter/
Muffler Cover
Shaft Tube Grip
Wheel Bracket
Assembly
Muffler
Spark
Plug
Tines
Figure 14
Read this operator’s manual and safety rules before
operating your cultivator. Compare illustrations in
Figure 14 with your cultivator to familiarize yourself
with the location of various controls and adjustments.
Save this manual for future reference.
Choke Control
The choke control is located above the air filter/muffler
cover. It is used to enrich the fuel mixture when starting
a cold engine. See Figure 14.
Primer Bulb
Application
The primer bulb is located to the left of the air
filter/muffler cover. It is used to draw fuel into the
carburetor when starting a cold engine or after
refueling the unit. See Figure 14.
Use this unit for tilling sod and light to medium soil.
Also for tilling in garden areas, around trees, etc.
Throttle Control
The throttle control trigger is located below the right
handlebar grip. It controls the engine speed. See
Figure 14.
Wheel Bracket Assembly
The wheel bracket assembly is used to help move the
unit when not in use and control the tilling depth
when in use. Refer to OPERATING YOUR
CULTIVATOR in Section 4.
On/Off Stop Control
The On/Off Stop control switch is located on the left
side mounting bracket. It is used to turn the unit on
and off. The switch must be in the START position to
start the unit. See Figure 14.
Tines
The tilling tines are used to cultivate, furrow, and
prepare your garden for seeding.
8
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SECTION 4: OPERATING YOUR CULTIVATOR
Oil and Gas Mixing Instructions
Old and/or improperly mixed fuel are the main
reasons for the unit not running properly. Be sure to
use fresh, clean unleaded fuel. Follow the instructions
carefully for the proper fuel/oil mixture.
+
Definition of Blended Fuels
Today's fuels are often a blend of gasoline and
UNLEADED GAS
ARNOLD 2 CYCLE OIL
oxygenates such as ethanol, methanol or MTBE
(ether). Alcohol-blended fuel absorbs water. As little
as 1% water in the fuel can make fuel and oil sepa-
rate. It forms acids when stored. When using alcohol-
blended fuel, use fresh fuel (less than 60 days old).
2 US. GALLONS
(7.6 LITERS)
+
8.0 FL. OZ.
(236 ml)
OR
1 US. GALLON
(3.8 LITERS)
+
4.0 FL. OZ.
(120 ml)
Using Blended Fuels
If you choose to use a blended fuel, or its use is
unavoidable, follow recommended precautions.
MIXING RATIO - 32:1
•
Always use fresh fuel mix per your operator's
manual.
Figure 15
WARNING: Gasoline is extremely
flammable. Ignited Vapors may explode.
Always stop the engine and allow it to
cool before filling the fuel tank. Do not
smoke while filling the tank. Keep sparks
and open flames at a distance from the
area.
•
•
•
Use the fuel additive STA-BIL® or an equivalent.
Always agitate the fuel mix before fueling the unit.
Drain the tank and run the engine dry before
storing the unit.
Using Fuel Additives
The use of fuel additive, such as STA-BIL® Gas
Stabilizer or an equivalent, will inhibit corrosion and
minimize the formation of gum deposits. Using a fuel
additive can keep fuel from forming harmful deposits
in the carburetor for up to six (6) months. Add 0.8 oz.
(23 ml.) of fuel additive per gallon of fuel according to
the instructions on the container. NEVER add fuel
additives directly to the unit's fuel tank.
WARNING: Remove fuel cap slowly to
avoid injury from fuel spray. Never
operate the unit without the fuel cap
securely in place.
WARNING: Add fuel in a clean, well
ventilated area outdoors. Wipe up any
spilled fuel immediately. Avoid creating
a source of ignition for spilt fuel. Do
not start the engine until fuel vapors
dissipate.
CAUTION: For proper engine operation
and maximum reliability, pay strict
attention to the oil and fuel mixing
instructions on the 2-cycle oil container.
Using improperly mixed fuel can
severely damage the engine.
NOTE: Dispose of the old fuel/oil mix in accordance
to Federal, State, and Local regulations.
Thoroughly mix the proper ratio of 2-cycle engine oil
with unleaded gasoline in a separate fuel can. Use a
32:1 fuel/oil ratio. Do not mix them directly in the
engine fuel tank. See Figure 15 for specific gas and
oil mixing ratios.
Filling The Fuel Tank
Fill or add fuel to the tank only when the cultivator is
in a horizontal position. See figure 16.
NOTE: Two gallons (7.6 liters) of unleaded gasoline
mixed with one 8 oz. (236 ml.) bottle of Arnold 2 Cycle
Oil makes a 32:1 fuel/oil ratio OR one gallon (3.8 liters)
of unleaded gasoline mixed with one 4 oz. (120 ml.)
bottle of Arnold 2 Cycle Oil makes a 32:1 fuel/oil ratio.
Figure 16
9
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Run
Position (C)
Starting Engine
Partial Position (B)
Full Choke
Position (A)
WARNING: Avoid accidental starting. Be
in the starting position when pulling the
starter rope. See Figure 19. The operator
and unit must be in a stable position
while starting to avoid serious personal
injury.
Choke Control
WARNING: Operate this unit only in a
well ventilated area outdoors. Carbon
monoxide exhaust fumes can be lethal
in a confined area.
Primer Bulb
1. Mix gas with oil. Fill fuel tank with fuel/oil mixture.
See Oil and Gas Mixing Instructions.
Figure 18
2. Put the On/Off Stop Control in the START (I)
position. See Figure 17.
NOTE: If the engine floods while trying to start, place
the choke lever in the RUN position (C ). Squeeze
the throttle control. Pull the starter rope briskly. The
engine should start within three (3) to eight (8) pulls.
3. Fully press and release primer bulb slowly 5 to 7
times. Fuel should be visible in the bulb. If fuel is
not visible, press three (3) more times, or until it
is. See Figure 18.
9. Squeeze the throttle control to warm up engine
for 5 to 10 seconds. Place the choke lever in the
4. Place the choke lever in the FULL choke position
RUN position (C
). See Figure 18.
(A
). See Figure 18.
NOTE: Choking is unnecessary when starting a warm
engine. Put the On/Off Stop Control in the START (I)
position and start in PARTIAL Choke
5. With the unit on the ground, squeeze the throttle
control and pull starter rope briskly. See Figure
18. Continue pulling until the engine sounds as
though it wants to run (normally 2 to 5 pulls).
position (B
). See Figures 17 and 18.
NOTE: Squeeze the throttle control until the engine
has started and warmed up.
To Stop Engine
1. Release your hand from the throttle control. See
Figure 19. Allow the engine to cool down by
idling.
6. Place the choke lever in the PARTIAL choke
position (B
NOTE: The unit will not run in the FULL choke
position (A ).
). See Figure 18.
2. Put the On/Off Stop Control in the STOP (O)
position. See Figure 17.
7. Pull starter rope briskly 1 to 3 times to start the
engine. See Figure 19.
8. If the engine does not start, repeat steps
4 through 7.
On/Off Stop
Control
START/ON (I)
Starter
Rope
Throttle
Control
STOP/OFF (O)
Figure 17
Figure 19
10
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WARNING: To prevent serious injury,
never do adjustments, maintenance or
repairs with unit running. Disconnect
spark plug wire to ensure the unit will
not start.
Using Your Cultivator
WARNING: Dress properly to reduce the
risk of injury when operating this unit.
Do not wear loose clothing or jewelry.
Wear eye and ear/hearing protection.
Wear heavy, long pants, boots and
gloves. Do not wear short pants, sandals
or go barefoot.
1. Stop the engine and disconnect the spark plug wire.
2. Loosen (do not remove) the two wing nuts on the
tine guard. See Figure 20.
3. Slide the wheel bracket assembly down for
shallower and up for deeper tine penetration.
1. Move the cultivator to the work area prior to
starting the engine. The cultivator may be
transported by pushing it on wheels or carrying it
by the shaft tube grip.
4. Once the tines are in the desired position, tighten
the wing nuts, making sure that the carriage bolts
are seated properly through the bracket.
WARNING: To prevent serious personal
injury, never pick-up or carry the unit
while the engine is running.
5. If the tine depth is not correct, repeat steps 2 to 4.
6. Reconnect the spark plug wire.
2. Start the unit per Starting Instructions.
3. With the engine running and the tines off the
ground, depress the throttle control to increase the
engine speed.
Up
4. Holding both of the handlebar grips firmly, slowly
lower the cultivator until the tines make contact
with the ground. See Figure 20.
5. As cultivating action begins, pull back on the
cultivator so that the tines can penetrate the
ground.
Down
6. Once the ground has been broken, continue at a
moderate pace until you are familiar with the
controls and the handling of the cultivator.
Figure 20
Transporting the Unit
7. Pull the cultivator backwards to improve the depth
of cultivation and reduce your effort.
WARNING: To prevent serious personal
injury, always stop the engine when
operation is delayed or when transport-
ing the unit from one location to another.
8. If the tines are digging too deep or not deep
enough, adjust the tines per Adjusting Tine Depth.
1. Stop the engine.
2. Slide the wheel bracket assembly all the way
down.
3. Tilt the unit back until the tines clear the ground.
4. Push or pull the unit to the next location to be
cultivated.
NOTE: The cultivator can also be carried by the shaft
tube grip. See Figure 21.
Shaft Tube
Grip
Figure 20
Adjusting Tine Depth
Tine adjustment will vary depending on the type of
soil being cultivated and how it will be used.
Generally, adjusting the tines to break the soil 4 to 6
inches is
recommended for most gardens. Adjust the tines as
follows:
Figure 21
11
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SECTION 5: MAKING ADJUSTMENTS
WARNING: To prevent serious injury,
never do adjustments, maintenance or
repairs with unit running. Always do
maintenance and repairs on a cool unit.
Disconnect spark plug wire to ensure
the unit will not start.
1. Start the engine and let it run about 2-3 minutes
at a high idle to warm up. Refer to OPERATING
YOUR CULTIVATOR in Section 4.
NOTE: Ensure the tines are not in contact with the
ground when adjusting the idle.
2. Release the throttle control and let the engine
idle. If the engine stops, insert a small phillips or
flat blade screwdriver into the hole in the air fil-
ter/muffler cover. Turn the idle speed screw in,
clockwise, 1/8 of a turn at a time (as needed) until
the engine idles smoothly. See Figure 22.
Wheel Adjustments
To adjust the wheel height, refer to OPERATING
YOUR CULTIVATOR in Section 4.
Carburetor Adjustments
NOTE: The tines should not rotate when the engine
idles.
WARNING: If any adjustments are made
to the engine while the engine is running
(e.g. carburetor), keep clear of all moving
parts. Be careful of heated surfaces and
muffler.
3. If the tines rotate when the engine idles, turn the
idle speed screw counterclockwise 1/8 of a turn
at a time (as needed), to reduce idle speed.
Checking the fuel mixture, cleaning the air filter, and
adjusting the idle speed screw should solve most
engine problems.
The idle speed adjuster of the engine is adjustable
through the air filter/muffler cover. See Figure 22.
NOTE: Careless adjustments can seriously damage
your unit. An authorized service dealer should make
carburetor adjustments.
If not and:
•
•
•
The engine will not idle,
The engine hesitates or stalls on acceleration,
There is a loss of engine power,
Check Fuel Mixture
Old and/or improperly mixed fuel is usually the reason
for the unit not running properly. Drain and refill the
tank with fresh, properly mixed fuel prior to making
any adjustments. Refer to OPERATING YOUR CULTI-
VATOR in Section 4.
have the carburetor adjusted by an authorized service
dealer.
Idle Speed Screw
Clean Air Filter
The condition of the air filter is important to the
operation of the unit. A dirty air filter will restrict air
flow and change the air/fuel mixture. This is often
mistaken for an out of adjustment carburetor. Check
the condition of the air filter before adjusting the idle
speed adjuster. Refer to MAINTAINING YOUR
CULTIVATOR in Section 6.
Adjusting Idle Speed
WARNING: This unit will need to be
running during idle speed adjustment.
Wear protective clothing and observe all
safety instructions to prevent serious
personal injury.
Figure 22
Engine Specifications
Engine Type … … … … … … …Air-Cooled, 2-Cycle
Displacement
… … … … … … … … … … … 31cc
If after checking the fuel mixture and cleaning the
air filter the engine still will not idle, adjust the idle
speed screw as follows.
Idle Speed R.P.M. … … … … … … 2,800-3,600 rpm
Operating R.P.M. … … … … … … 6,700-9,000 rpm
Fuel/Oil Mixture Ratio. … … … … … … … … … 32:1
12
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SECTION 6: MAINTAINING YOUR CULTIVATOR
Maintenance Schedule
These required maintenance procedures should be performed at the frequency stated in the table. They should
also be included as part of any seasonal tune-up.
FREQUENCY
MAINTENANCE REQUIRED
Before Starting Engine
Fill fuel tank with correct oil and fuel mixture.
Every 10 Hours
Clean and re-oil air filter.
Every 50 Hours or Seasonal
Check spark plug condition and gap.
WARNING: To avoid serious personal
Choke Control
injury, always turn the unit off, allow it
to cool and disconnect the spark plug
before you clean or perform any
maintenance on it.
Partial Choke
Position (B)
Lubrication
Gearbox-The gearbox is pre-lubricated and sealed at
the factory.
Screws
Screws
Trouble Shooting
Refer to the trouble shooting chart for more informa-
tion.
Engine
Figure 23
IMPORTANT: Never run your engine without air
cleaner completely assembled.
Air Filter Maintenance
1. Place the choke control in the PARTIAL choke
position (B).
NOTE: The choke control must be in the PARTIAL
choke position (B) to remove the air filter/muffler
cover. See Figure 23.
Air Filter
2. Remove the four (4) screws securing the air
filter/muffler cover. See Figure 23. Use a flat blade
or # T20 Torx bit screwdriver.
3. Pull the cover from the engine. Do not force.
Figure 24
4. Remove the air filter from behind the air filter/
muffler cover. See Figure 24.
4. Wash the filter in detergent and water. Rinse the
filter thoroughly. Squeeze out excess water. Allow
it to dry completely.
5. Apply enough clean SAE 30 oil to lightly coat the
filter. See Figure 25.
6. Squeeze the filter to spread and remove excess
oil. See Figure 25.
Figure 25
13
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7. Replace the air filter inside the air filter/muffler
cover. See Figure 24.
Tine Removal And Replacement
All 4 tines should be replaced at the same time
because they will wear evenly through normal use.
Work on one side at a time.
NOTE: Operating the unit without the air filter and air
filter/muffler cover assembly, will VOID the warranty.
8. Place the air filter/muffler cover over the back of
the carburetor and muffler.
WARNING: To prevent serious personal
injury, always wear heavy gloves when
handling the tines.
NOTE: The choke control must be in the PARTIAL
choke position (B) to install the air filter/muffler cover.
See Figure 23.
1. Put the On/Off Stop Control in the STOP (O)
position and disconnect the spark plug wire.
9. Insert the four (4) screws into the holes in the air
filter/muffler cover and tighten. See Figure 23.
Use a flat blade or # T20 Torx bit screwdriver. Do
not over tighten. Do not force.
2. Remove the clevis pin clips and clevis pins. See
Figure 27.
3. Remove the tines and felt cushions from the
shaft.
4. Clean and oil the shaft.
Replacing The Spark Plug
5. The tines are stamped with the letter "R" or "L" to
identified their position on each side of the gear-
box when facing the front of the unit.
Use a Champion RDJ7Y spark plug (or equivalent).
The correct air gap is 0.020 inch (0.5 mm). Remove
the plug after every 50 hours of operation to check its
condition.
6. Replace the tines and felt cushions onto the shaft
with the hubs on the tines facing each other.
1. Stop the engine and allow it to cool. Grasp the
plug wire firmly and pull the cap from the spark
plug.
7. Ensure the tips on tines are aligned in the same
direction with each other before reinstalling the
clevis pins and pin clips. See Figure 28.
2. Clean dirt from around the spark plug. Remove
the spark plug from the cylinder head by turning a
5/8 in. socket counterclockwise.
8. Repeat this procedure on the opposite side.
NOTE: When installed correctly, there will be an "R"
and "L" tine on each side of the gearbox and the
tips on the tines line up in the same direction. It is
important that the tines are installed correctly.
NOTE: Replace cracked, fouled or dirty spark plug.
3. Set the air gap at 0.020 inch (0.5 mm) using a
feeler gauge. See Figure 26.
Clevis Pin
CAUTION: Do not sand blast, scrape, or
clean electrodes. Grit in the engine could
damage the cylinder.
Felt
Cushion
4. Install a correctly gapped spark plug in the cylin-
der head. Tighten by turning the 5/8 inch socket
clockwise until snug.
Tine Hubs
Clevis Pin Clip
If using a torque wrench torque to;
110-120 in.•lb. (12.3-13.5 N•m).
Do not over tighten.
Figure 27
Align Tips
0.020 inch
(0.5 mm)
Shaft
Felt
Cushion
Figure 26
R
L
R
L
Figure 28
14
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SECTION 7: OFF SEASON STORAGE
If the unit will be stored for an extended time,
4. Thoroughly clean the unit and inspect for any
loose or damaged parts. Repair or replace
damaged parts and tighten loose screws, nuts or
bolts.
1. Drain all fuel from the fuel tank into a container.
Do not use fuel that has been stored for more
than 60 days. Dispose of the old fuel in
accordance to local regulations.
5. Wipe the tines with an oiled rag to prevent rust.
The unit is ready for storage.
2. Start the engine and allow it to run until it stalls.
This ensures that all fuel has been drained from
the carburetor.
•
Never store the unit with fuel in the tank where
fumes may reach an open flame or spark.
•
•
Allow the engine to cool before storing.
Store the unit in a locked up area to prevent
unauthorized use or damage.
Store the unit in a dry, well ventilated area. Do not
store next to corrosive materials, such a fertilizer.
Store the unit out of the reach of children.
3. Allow the engine to cool. Remove the spark plug
and put 1 oz. (30 ml) of high quality motor oil
into the cylinder. Pull the starter rope slowly to
distribute the oil. Reinstall the spark plug.
•
•
NOTE: Remove the spark plug and drain all of the oil
from the cylinder before attempting to start the unit
after storage.
SECTION 8: TROUBLE SHOOTING GUIDE
Trouble
Possible Cause(s)
Corrective Action
ENGINE WILL NOT START
On/Off Stop Control in the STOP
position
Turn the On/Off Stop Control to START
Empty fuel tank
Fill fuel tank
Primer bulb wasn't pressed enough
Press primer bulb fully and slowly 5-7
times
Engine flooded
Use starting procedure with choke
control in the RUN position
Old or improperly mixed fuel
Fouled spark plug
Drain fuel tank / Add fresh fuel mixture
Replace or clean the spark plug
ENGINE WILL NOT IDLE
Air Filter is Plugged
Replace or clean the air filter
Old or improperly mixed fuel
Improper carburetor adjustment
Drain fuel tank / Add fresh fuel mixture
Refer to MAKING ADJUSTMENTS,
Section 5.
ENGINE WILL NOT
ACCELERATE
Old or improperly mixed fuel
Drain fuel tank / Add fresh fuel mixture
Improper carburetor adjustment
Refer to MAKING ADJUSTMENTS,
Section 5.
ENGINE LACKS POWER
OR STALLS WHEN UNDER
LOAD
Old or improperly mixed fuel
Drain fuel tank / Add fresh fuel mixture
Improper carburetor adjustment
Refer to MAKING ADJUSTMENTS,
Section 5.
Cultivator tines bound with dirt or
grass
Stop the unit, switch the On/Off Stop
Control to STOP, clean and remove
any debris binding the tines
15
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SECTION 9: PARTS LIST FOR MODEL 21A-120R000
3
41
19
4
5
18
6
17
7
11
37
38
39
13
21
3
8
40
14
9
10
1
52
22
2
12
20
15
23
16
50
51
41
42
26
48
32
27
28
30
31
49
33
34
24
43
29
25
47
45
46
44
30
35
36
41
16
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MODEL 21A-120R000
Ref.
Ref.
No.
Part No.
No.
Part Description
Part No.
Part Description
1.
182059
Air Cleaner/Muffler Cover Assembly
(includes 2 & 41)
36
182776
Starter Housing Assembly
(includes items 28-31, 33-35)
2.
3.
180350
180351
Air Cleaner Filter
37
38
39
40
182368
182369
153592
180098
Clutch Washer
Carburetor Mounting Screw
Assembly
Clutch Rotor Assembly
Clutch Drum Assembly
4.
5.
6.
7.
8.
180226
182160
182161
182162
182062
Wavey Washer
Clutch Cover Assembly
(includes 41)
Choke Lever Assembly (includes 6)
Choke Knob and Screw
41
42
43
44
45
46
47
48
49
181345
153597
181937
181580
610311
182065
182174
182464
181622
Clutch Cover Screw
Upper Clamp Assembly
Module Assembly
Choke Lever and Plate (includes 5)
Carburetor Assembly W/Limiter
Caps (includes 9 & 21)
Wire Lead
9.
610675
181860
181801
182063
684451
182790
612115
182791
Carburetor Gasket
Spark Plug
10.
11.
12.
13.
14.
15.
16.
Carb Mount Screw
Exhaust Gasket
Primer and Hose Assembly
Carb Mount Assembly (includes 10)
Reed Assembly
Muffler Assembly (includes 46 & 48)
Muffler Mounting Bolt Assembly
Cylinder Assembly
(includes 51 & 52)
Power Shaft Assembly
Carburetor Mount Gasket
50
51
52
*
684449
610674
182723
180011
180602
Piston and Rod Assembly
Cylinder Gasket
Crank Case Service Assembly
(includes 10, 14 & 24)
Cylinder Bolt
17.
18.
612134
180046
Rear Mounting Pad
Engine Gasket Kit
Fuel Tank Assembly
(includes 19-21)
*
O.E.M. Carburetor Repair Kit
(Walbro)
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
181559
181168
682039
145308
683065
181861
182064
182736
181065
181597
613102
181441
611061
180317
181079
613103
181912
Fuel Cap Assembly
Fuel Return Line
Fuel Line Assembly
Front Mounting Pad
Shroud Assembly
Shroud Screw
*
*
180090
181069
O.E.M. Carburetor Repair Kit (Zama)
Gasket-Diaphragm Repair Kit
(Walbro)
*
180091
Gasket-Diaphragm Repair Kit
(Zama)
*
*
180530
182792
Piston Ring
Short Block Assembly
(includes 45, 49-52)
Shroud Extension and Stand
Flywheel Assembly
Spacer
*
*
*
*
*
181501
181873
181562
610309
181599
Starter Housing Screw Set
Carburetor Limiter Cap Set (Walbro)
Carburetor Limiter Cap Set (Zama)
Crankcase Seal
Recoil Pulley Assembly
Recoil Spring
Pulley Retainer Assembly
Rope Guide
Clutch Springs (Qty. 2)
Fuel Tank Guard Assembly
Pull Handle
*
not shown
Rope
Housing Screw
17
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MODEL 21A-120R000
2
3
11
12
4
1
8
9
17
6
18
19
23
20
24
6
13
9
1
7
5
14
15
16
10
22
26
25
22
21
27
24
28
28
29
30
27
29
18
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MODEL 21A-120R000
Ref.
No.
Ref.
Part No.
Part Description
Part No.
No.
Part Description
1
2
181573
180942
Throttle Trigger and Cable Assembly
18
19
20
21
22
23
24
25
26
27
28
180943
181577
181578
180288
147467
182781
181579
180320
180944
147473
182729
Drive Shaft Housing Assembly
Flexible Drive Shaft
Handle Bar w/Clamp Assemblies
(includes 3-5)
Retainer Sleeve (includes 21)
Sleeve Retainer Bolt
3
4
612831
612021
181503
147501
181574
181504
682035
683295
Grip
Tube Closure
Wheel Bracket Mounting Hardware
Guard
5
Clamp Assembly
6
Engine Bracket Mounting Hardware
Engine Mount Bracket, R.H.
Engine Mount Bracket, L.H.
Switch Assembly
Guard Mounting Hardware
Wheel Bracket Assembly
Wheel Assembly
7
8
9
Tine Fastener Assembly
10
Handle Bracket Assembly
(includes 11-16)
Tine Assembly (Left Outer or Right
Inner)
11
12
13
14
15
16
17
181811
181812
181813
181814
181815
145569
181575
Screw
29
182730
Tine Assembly (Left Inner or Right
Outer)
Upper Handle Clamp
Middle Handle Clamp
Lower Handle Clamp
Nut
30
*
182750
182780
Gear Box Assembly
Arnold 2-Cycle Oil
Anti-Rotation Screw
Grip
*
not shown
19
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MANUFACTURER’S LIMITED WARRANTY FOR:
The limited warranty set forth below is given by MTD
SOUTHWEST INC (“MTD”) with respect with new
merchandise purchased and used in the United States, its
possessions and territories.
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 replace-
ment 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.)
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 for use with the product(s) covered by
this manual will void your warranty as to any resulting dam-
age. This warranty is limited to ninety (90) days from the
date of original retail purchase for any MTD product that is
used for rental or commercial purposes, or any other
income-producing purpose.
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, expens-
es incurred for substitute or replacement lawn care
services, for transportation or for related expenses, or
for rental expenses to temporarily replace a warrant-
ed product. (Some states do not allow limitations on how
long an implied warranty lasts, so the above limitation
may not apply to you.)
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 SOUTH-
WEST INC by calling 1-800-345-8746 or writing to 550 N.
54th Street, Chandler, Arizona 85226 or if in Canada call
1-800-668-1238. No product returned directly to the facto-
ry will be accepted unless prior written permission has been
extended by the Customer Service Department of MTD
SOUTHWEST INC.
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 warranty
gives you specific legal rights, and you may also have
other rights which vary from state to state.
This limited warranty does not provide coverage in the
following cases:
A. Tune-ups - Spark Plugs, Carburetor Adjustments,
Filters
To locate your nearest service dealer dial
1-800-345-8746 in the United States or
1-800-668-1238 in Canada.
B. Wear items - Starter Pulley, Starter Ropes, Tines
C. 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 distri-
bution.
MTD Southwest Inc
550 N. 54th Street
MTD reserves the right to change or improve the design
of any MTD Product without assuming any obligation to
modify any product previously manufactured.
Chandler, AZ 85226 U.S.A.
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