Remington RM2510, RM2570, RM2520 Operator's Manual
769-10118 / 00 08/14
2-Cycle Trimmer
RM2510
TABLE OF CONTENTS
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Know Your Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Oil and Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Starting and Stopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Operator’s Manual
All information, illustrations, and specifications in this manual are based
on the latest product information available at the time of printing. We
reserve the right to make changes at any time without notice.
Copyright© 2014 MTD SOUTHWEST INC, All Rights Reserved.
DO NOT RETURN THIS UNIT TO THE RETAILER. PROOF OF
PURCHASE WILL BE REQUIRED FOR WARRANTY SERVICE.
For assistance regarding the assembly, controls, operation or
maintenance of the unit, please call the Customer Support Department
at 1-866-206-2707 in the United States or 1-877-696-5533 in Canada.
Additional information about the unit can be found on our website at
www.remingtonpowertools.com.
For service, please call the Customer Support Department to obtain
a list of authorized service dealers near you. Service on this unit,
both within and after the warranty period, should only be performed
by an authorized and approved service dealer. When servicing, use
only identical replacement parts.
SERVICE
IMPORTANT: Read this manual thoroughly before using this product. Follow all instructions.
SAVE THESE INSTRUCTIONS
2
• IMPORTANT SAFETY INSTRUCTIONS •
SAFETY
SPARK ARRESTOR NOTE
NOTE: For users on U.S. Forest Land and in the states of
California, Maine, Oregon and Washington. All U.S. Forest Land
and the state of California (Public Resources Codes 4442 and
4443), Oregon and Washington require, by law that certain internal
combustion engines operated on forest brush and/or grass-covered
areas be equipped with a spark arrestor, maintained in effective
working order, or the engine be constructed, equipped and
maintained for the prevention of fire. Check with your state or local
authorities for regulations pertaining to these requirements. Failure
to follow these requirements could subject you to liability or a fine.
This unit is factory equipped with a spark arrestor. If it requires
replacement, contact your local service dealer to install the
appropriate muffler assembly.
Read the operator’s manual and follow all warnings and safety
instructions. Failure to do so can result in serious injury to the
operator and/or bystanders.
SYMBOL MEANING
WARNING:Signals a SERIOUS hazard.
Failure to obey a safety WARNING signal CAN result in
serious injury to yourself or to others.
CAUTION:Signals a MODERATE hazard.
Failure to obey a safety CAUTION signal MAY result in
property damage or injury to yourself or to others.
The purpose of safety symbols is to attract your attention to
possible dangers. The safety symbols, and their explanations,
deserve your careful attention and understanding. The safety
warnings do not by themselves eliminate any danger. The
instructions or warnings they give are not substitutes for proper
accident prevention measures.
NOTE: Advises you of information or instructions vital to the
operation or maintenance of the equipment.
DANGER:
Signals an EXTREME hazard.
Failure to obey a safety DANGER signal WILL result in
serious injury or death to yourself or to others.
READ ALL INSTRUCTIONS BEFORE OPERATING
• 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 must not operate the unit. Teens must be accompanied
and 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.
• Only use the trimming line described in the Specifications section
of this manual. Never use metal-reinforced line, wire, chain or
rope. These can break off and become dangerous projectiles.
• Do not replace the cutting head with rigid or metal blades. Doing
so could result in serious injury.
WARNING:
When using the unit, all safety
rules must be followed. Please read these instructions
before operating the unit in order to ensure the safety of
the operator and any bystanders. Please keep these
instructions for later use.
• Be aware of risk of injury to the head, hands and feet.
• Carefully inspect the area before starting the unit. Remove
rocks, broken glass, nails, wire, string and other objects that
may be thrown or become entangled with the unit.
• Clear the area of children, bystanders and pets; keep them
outside a 50-foot (15 m) radius, at a minimum. Even then, they are
still at risk from thrown objects. Encourage bystanders to 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 the unit.
• This unit is intended for occasional, household use only.
CALIFORNIA PROPOSITION 65
WARNING:This product contains a
chemical known to the State of California to cause cancer,
birth defects or other reproductive harm.
3
SAFETY WARNINGS FOR GAS UNITS
• Store fuel only in containers specifically designed and approved
for the storage of such materials.
• Always stop the engine and allow it to cool before filling the
tank. Never remove the fuel tank cap or add fuel when the
engine is hot. Always loosen the fuel tank cap slowly to relieve
any pressure in the tank before fueling.
• Always mix and add fuel in a clean, well-ventilated outdoor area
where there are no sparks or flames. DO NOT smoke.
• Never operate the unit without the fuel cap securely in place.
• Avoid creating a source of ignition for spilled fuel. Wipe up any
spilled fuel from the unit immediately, before starting the unit.
Move the unit at least 30 ft. (9.1 m) from the fueling source and
site before starting the engine. DO NOT smoke.
• 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 outdoor area.
WARNING:Gasoline is highly flammable and
its vapors can explode if ignited. Take the following
precautions:
WHILE OPERATING
• Wear safety glasses or goggles that meet current ANSI / ISEA
Z87.1 standards and are marked as such. Wear ear/hearing
protection when operating this unit. Wear a face mask or dust
mask if the operation is dusty.
• Wear heavy long pants, boots, gloves and a long sleeve shirt. Do
not wear loose clothing, jewelry, short pants, sandals or go
barefoot. Secure hair above shoulder level.
• The cutting head shield must always be in place while operating
the unit. Do not operate the unit without both trimming lines
extended and the proper line installed. Do not extend the
trimming line beyond the length of the shield.
• This unit has a clutch. The cutting head remains stationary when
the engine is idling. If it does not, take the unit to an authorized
service dealer for an adjustment.
• Adjust the handle to provide the best grip, if applicable.
• Make sure the attachment is not in contact with anything before
starting the unit.
• Use the unit only in daylight or good artificial light.
• 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. Refer to Starting and Stopping.
• Use the right tool. Only use this tool for its intended purpose.
• Always hold the unit with both hands when operating. Keep a
firm grip on both handles or grips.
• Do not overreach. Always keep proper footing and balance. Take
extra care when working on stairs, steep slopes or inclines. To
avoid serious injury, do not operate the unit while on a ladder or
a roof.
• Keep hands, face, and feet away from all moving parts. Do not
touch or try to stop moving parts.
• Do not touch the engine, gear housing or muffler. These parts get
extremely hot from operation, even after the unit is turned off.
• Do not operate the unit faster than the speed needed to do the job.
Do not run the unit at high speed when not in use.
• Do not force the unit. It will do a better, safer job when used at
the intended rate.
• Always stop the unit when operation is delayed or when walking
from one location to another.
OTHER SAFETY WARNINGS
• Maintain the unit with care.
• All service, other than the maintenance procedures described in
this manual, should be performed by an authorized service dealer.
• Never remove, modify or make inoperative any safety device
furnished with the unit.
• Before inspecting, servicing, cleaning, storing, transporting or
replacing any parts on the unit:
1. Stop the unit.
2. Make sure all moving parts have stopped.
3. Allow the unit to cool.
4. Disconnect the spark plug wire.
• Secure the unit while transporting.
• Never store the unit with fuel in the tank, inside a building where
fumes may reach an open flame (pilot lights, etc.) or sparks
(switches, electrical motors, etc.).
• Store the unit in a dry place, secured or at a height to prevent
unauthorized use or damage. Keep the unit out of the reach of
children.
• Never douse or squirt the unit with water or any other liquid.
Keep handles dry and clean (free from debris, oil and grease).
Clean the unit after each use. Refer to Cleaning and Storage. Do
not use solvents or strong detergents.
• Keep these instructions. Refer to them often and use them to
instruct other users. If you loan this unit to others, also loan
them these instructions.
SAVE THESE INSTRUCTIONS
• If you strike or become entangled with a foreign object, stop the
unit immediately and check for damage. Do not operate the unit
before repairing damage. Do not operate the unit with loose or
damaged parts.
• Turn the engine to off and disconnect the spark plug for
maintenance or repair.
• Use only original equipment manufacturer (OEM) replacement
parts and accessories for this unit. These are available from your
authorized service dealer. Use of any other parts or accessories
could lead to serious injury to the user, or damage to the unit,
and void the warranty.
• Keep the unit clean. Carefully remove vegetation and other
debris that could block moving parts.
• To reduce fire hazard, replace a faulty muffler and spark arrestor.
Keep the engine and muffler free from grass, leaves, excessive
grease or carbon build up.
• If the unit starts to vibrate abnormally, stop the unit immediately.
Inspect the unit for the cause of the vibration. Vibration is
generally an indicator of trouble.
4
• SAFETY & INTERNATIONAL SYMBOLS •
This operator's manual describes safety and international symbols and pictographs that may appear on this product. Read the operator's
manual for complete safety, assembly, operating and maintenance and repair information.
SYMBOL MEANING SYMBOL MEANING
• SAFETY ALERT SYMBOL
Indicates danger, warning or caution. May be used in
conjunction with other symbols or pictographs.
• READ OPERATOR'S MANUAL
WARNING:
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
WARNING:Thrown objects and loud
noise can cause severe eye injury and hearing loss.
Wear eye protection meeting current ANSI / ISEA
Z87.1 standards and ear protection when operating
this unit. Use a full face shield when needed.
• UNLEADED FUEL
Always use clean, fresh unleaded fuel.
• OIL
Refer to operator’s manual for the proper type of oil.
• DO NOT USE E85 FUEL IN THIS UNIT
WARNING:It has been proven that fuel
containing greater than 10% ethanol will likely
damage this engine and void the warranty.
• ON/OFF STOP CONTROL
ON / START / RUN
• ON/OFF STOP CONTROL
OFF or STOP
• PRIMER BULB
Push primer bulb, fully and slowly, 10 times.
• CHOKE CONTROL
1. • FULL choke position
2. • PARTIAL choke position
3. • RUN choke position
• THROWN OBJECTS AND ROTATING CUTTER CAN
CAUSE SEVERE INJURY
WARNING:
Small objects can be
propelled at high speed, causing injury. Keep away
from the rotating rotor.
• KEEP BYSTANDERS AWAY
WARNING:
Keep all bystanders,
especially children and pets, at least 50 feet (15 m)
from the operating area.
• HOT SURFACE
WARNING:
Do not touch a hot muffler
or cylinder. You may get burned. These parts get
extremely hot from operation. When turned off, they
remain hot for a short time.
• SHARP BLADE
WARNING:Sharp blade on trimmer
attachment shield. To prevent serious injury, do not
touch the line cutting blade.
Cutting Head
Shield
Fuel Cap
Handle
Cutting Head
Shaft Grip
Shaft Housing
Starter
Rope Grip
Throttle
Control
Spark Plug
Muffler
On/Off Switch
Primer Bulb
Line Cutting Blade
Choke Lever
Air Filter
Cover
5
KNOW YOUR UNIT
APPLICATIONS
• Cutting grass and light weeds.
• Edging
• Decorative trimming around trees, fences, etc.
SPECIFICATIONS*
* All specifications are based on the latest product information available at the time of printing. We reserve the right to make changes at any
time without notice.
Engine Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 cc (1.52 cu. in.)
Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 in. (0.635 mm)
Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion® RDJ7J or equivalent plug
Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel/Oil Mixture
Fuel/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40:1
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 oz. (296 ml)
Approximate Unit Weight (No fuel). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 11 lbs. (4.5 - 5 kg)
Trimmer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Head
Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.095 in. (2.41 mm)
Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 in. (43.18 cm)
NO ASSEMBLY TOOLS REQUIRED
ASSEMBLY
6
INSTALLING THE CUTTING HEAD SHIELD
1. Remove the wing nut and washer from the cutting head shield.
2. Insert the short tab (the one without a hole) on the mount
bracket into the slot on the cutting head shield (Fig. 1).
3. Rotate the cutting head shield counterclockwise to align the hole
on the cutting head shield with the hole on the mount bracket
(Fig. 1).
4. Insert the square bolt into the hole underneath the cutting head
shield (Fig. 2). Push the square bolt through the cutting head
shield and mount bracket.
5. Put the washer onto the square bolt (Fig. 2).
6. Screw the wing nut onto the square bolt until the cutting head
shield is firmly in place (Fig. 2).
Fig. 1
Mount Bracket
Cutting Head
Shield
WARNING:
To prevent serious personal injury, never
operate the unit without the cutting head shield in place.
Fig. 2
Washer
Square Bolt
Slot
Wing Nut
Cutting Head
Shield
Mount Bracket
Fig. 3
Bolt
Shaft Grip
Minimum 6 in.
(15.24 cm)
Washer
Handle
Tighten
Wing Nut
INSTALLING AND ADJUSTING THE HANDLE
Installing the Handle
1. Push the handle down onto the shaft housing (Fig. 3). The hex
bolt hole in the handle should be to the left.
2. Insert the bolt into the hex bolt hole and push it through (Fig. 3).
Place the washer onto the bolt. Screw the wing nut onto the
bolt, but do not tighten the wing nut completely .
3. While holding the unit in the operating position (Fig. 7), move the
handle to the location that provides the best grip. Place it a
minimum of 6 inches (15.24 cm) from the end of the shaft grip
(Fig. 3).
4. Tighten the wing nut until the handle is secure.
Adjusting the Handle
If the handle requires adjustment:
1. Loosen the wing nut (Fig. 3).
2. While holding the unit in the operating position (Fig. 7), move the
handle to the location that provides the best grip. Place it a
minimum of 6 inches (15.24 cm) from the end of the shaft grip
(Fig. 3).
3. Tighten the wing nut until the handle is secure.
7
OIL AND FUEL
FUELING THE UNIT
1. Position the unit with the fuel cap facing up.
2. Remove the fuel cap.
3. Place the fuel container spout into the fill hole on the fuel tank
and fill the tank.
NOTE: Do not overfill the tank.
4. Wipe up any fuel that may have spilled.
5. Reinstall the fuel cap.
6. Move the unit at least 30 ft. (9.1 m) from the fuel container and
the fueling site before starting the engine.
OIL AND FUEL MIXING INSTRUCTIONS
The use of old and/or improperly mixed fuel is the most common cause
of performance problems. Use only fresh, clean unleaded gasoline.
Follow the instructions carefully for the proper gasoline/oil mixture.
Definition of Blended Fuels
Today's fuels are often a blend of gasoline and 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
separate, forming acids when stored. ALWAYS use fresh fuel (less
than 30 days old).
NOTE: Dispose of old fuel according to federal, state and local
regulations.
Using Blended Fuels
If using a blended fuel:
• Always use the fresh fuel mix explained in your operator's manual
• 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 bottle of 2-cycle oil provided with this unit contains a fuel
additive to help inhibit corrosion and minimize gum deposits.
Always use the brand of 2-cycle oil that came with this unit. If this is
unavailable, use a 2-cycle oil designed for air-cooled engines and
mix it with a fuel additive, such as STA-BIL Fuel Stabilizer or an
equivalent. 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.
Mixing the Fuel
NOTE: This unit comes with a 3.2 oz. (95 ml) bottle of 2-cycle oil. To
obtain the correct fuel mixture described below, pour the entire
bottle into one gallon of unleaded gasoline.
Thoroughly mix the proper ratio of unleaded gasoline with 2-cycle
engine oil. Do not mix them directly in the unit’s fuel tank. Use a
separate fuel can. Use a 40:1 gasoline/oil ratio. See the table below
for specific gasoline and oil mixing ratios.
Unleaded gasoline 2-cycle oil
1 gallon U.S.
(3.8 liters)
3.2 fl. oz.
(95 ml)
1 liter 25 ml
MIXING RATIO - 40:1
CAUTION:
For proper engine operation and maximum
reliability, pay strict attention to the gasoline and oil mixing
instructions on the 2-cycle oil bottle. Using improperly
mixed fuel can severely damage the engine.
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.
WARNING:
Remove the 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 outdoor
area. Wipe up any spilled fuel immediately. Avoid creating
a source of ignition for spilled fuel. Do not start the engine
until fuel vapors dissipate.
WARNING:
DO NOT USE E85 FUEL IN THIS UNIT. It
has been proven that fuel containing greater than 10%
ethanol will likely damage this engine and void the warranty.
8
STARTING AND STOPPING
WARNING:
Operate this unit only in a well-ventilated
outdoor area. Carbon monoxide exhaust fumes can be
lethal in a confined area.
WARNING:
Avoid accidentally starting the unit. To avoid
serious injury, the operator and the unit must be in a stable
position when pulling the starter rope (Fig. 6).
STARTING INSTRUCTIONS
1. Mix gasoline with oil. Refer to Oil and Fuel Mixing Instructions.
2. Fill the fuel tank. Refer to Fueling the Unit.
NOTE: There is no need to turn the unit on. The On/Off switch is in
the ON ( I ) position at all times (Fig. 4).
3. Slowly press and release the primer bulb 10 times (Fig. 5). If fuel
cannot be seen in the primer bulb, press and release the primer
bulb until fuel is visible.
4. Move the choke lever to Position 1 (Fig. 5).
5. Crouch in the starting position (Fig. 6).
6. Squeeze the throttle control (Fig. 4) and pull the starter rope with
a controlled and steady motion 5 times (Fig. 6).
NOTE: SQUEEZE and HOLD the throttle control for ALL further steps.
7. Continue to squeeze the throttle control. Move the choke lever
to Position 2 (Fig. 5).
8. Continue to squeeze the throttle control. Pull the starter rope with
a controlled and steady motion 3 to 5 times to start the engine.
9. Continue to squeeze the throttle control. Allow the engine to
warm up for 30 to 60 seconds.
10. Continue to squeeze the throttle control. Move the choke lever
to Position 3 (Fig. 5) and continue warming the engine for an
additional 60 seconds. The unit may be used during this time.
NOTE: The engine is properly warmed up when it accelerates
without hesitation.
IF... the engine hesitates, return the choke lever to Position 2 (Fig. 5)
and continue the warm-up.
IF... the engine does not start, begin the starting procedure with
step 3.
IF... the engine fails to start after a few attempts, move the choke
lever to Position 3 and squeeze the throttle control. Pull the
starter rope with a controlled and steady motion 3 to 8 times.
The engine should start. If it does not, repeat this instruction.
IF... the engine is already warm, begin the starting procedure with
step 7.
STOPPING INSTRUCTIONS
1. Release the throttle control and allow the engine to idle.
2. Press and hold the On/Off switch in the OFF (O) position until
the engine comes to a complete stop (Fig. 4).
Fig. 4
Fig. 6
On ( I ) / Start
Off (O) / Stop
Throttle Control
Starting
Position
Throttle Control
Starter Rope Grip
Fig. 5
Primer Bulb
Position 3Position 2
Position 1
Choke Lever
9
OPERATION
ADJUSTING THE TRIMMING LINE LENGTH
This unit is equipped with a bump head. Trimming line can be
released from the cutting head without stopping the engine.
To release more line, lightly tap the bump knob on the ground (Fig. 8)
while operating the unit at high speed. For best results, tap the bump
knob on bare ground or hard soil. Attempting to release line in tall
grass may stall the engine.
NOTE: Do not rest the cutting head on the ground while the unit is
running.
Each time the bump knob is tapped, about 1 inch (25.4 mm) of
trimming line is released.
NOTE: Always keep the trimming line fully extended. Line release
becomes more difficult when the cutting line gets shorter.
A blade in the cutting head shield will cut the line to the proper
length if any excess line is released.
CAUTION:
Do not remove or alter the line cutting blade
assembly. Excessive line length will make the unit
overheat. This may lead to serious personal injury or
damage to the unit.
Fig. 7
Fig. 8
Bump Knob
HOLDING THE UNIT
• Stand in the operating position (Fig. 7). Stand up straight. Do not
bend over.
• Keep feet apart and firmly planted.
• Hold the shaft grip with the right hand. Keep the right arm
slightly bent.
• Hold the handle with the left hand. Keep the left arm straight.
• Hold the unit at waist level.
• Position the cutting head a few inches above the ground.
WARNING:
Always wear eye, hearing, hand, foot and
body protection to reduce the risk of injury when operating
this unit.
TIPS FOR BEST RESULTS
• To direct clippings away from the operator, tilt the cutting head
slightly down to the left; cut from right to left whenever possible.
• Do not trim wet grass or weeds.
NOTE: Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick vegetation
• Forcing the line into objects such as walls or fence posts
WARNING:
To prevent serious personal injury, avoid arm
contact with the engine while operating the unit. The
engine may be extremely hot.
10
MAINTENANCE SCHEDULE
Perform these required maintenance procedures at the frequency
stated in the table. These procedures should also be a part of any
seasonal tune-up.
NOTE: Some maintenance procedures may require special tools or
skills. If you are unsure about these procedures, take the unit to
an MTD authorized service dealer.
NOTE: Maintenance, replacement, or repair of the emission control
devices and system may be performed by an MTD authorized
service dealer.
NOTE: Please read the California/EPA statement that came with the
unit for a complete listing of terms and coverage for the emissions
control devices, such as the spark arrestor, muffler, carburetor, etc.
WARNING:
To prevent serious injury, never perform
maintenance or repairs while the unit is running. Always
allow the unit to cool before servicing or repairing the unit.
Disconnect the spark plug wire to prevent the unit from
starting accidentally.
MAINTENANCE
FREQUENCY MAINTENANCE REQUIRED
Every 10 hours • Clean and re-oil the air filter. Refer to
Maintaining the Air Filter.
Every 25 hours • Check the spark plug condition and gap.
Refer to Maintaining the Spark Plug.
Fig. 9
DECORATIVE TRIMMING
When trimming around trees, posts, fences, etc., rotate the whole
unit so that the cutting head is at a 30° angle to the ground (Fig. 9).
11
REPLACING THE TRIMMING LINE
Only use the trimming line described in the Specifications section.
Other types of trimming line may cause the unit to overheat or fail.
NOTE: Always use the correct line length when installing trimming
line. The line may not release properly if the line is too long.
Part 1 - Removing the Inner Reel
1. Hold the outer spool with one hand and unscrew the bump knob
counterclockwise (Fig. 10).
NOTE: The outer spool will remain attached to the unit.
2. Inspect the bolt inside the bump knob to make sure it moves
freely. Replace the bump knob if it is damaged.
3. Remove the inner reel from the outer spool (Fig. 11).
4. Remove the spring from the inner reel (Fig. 11).
5. Use a clean cloth to clean the inner reel, spring, shaft and inner
surface of the outer spool.
6. Check the indexing teeth and holding slots for wear (Fig. 12). If
necessary, remove burrs or replace the inner reel and outer spool.
Proceed to Part 2 - Winding New Trimming Line onto the Inner Reel.
WARNING:
Never use metal-reinforced line, wire, chain or
rope. These can break off and become dangerous projectiles.
Fig. 10
Bolt
Bump Knob
Outer Spool
Fig. 11
Outer Spool
Spring
Inner Reel
Shaft
Fig. 12
Indexing Teeth
Holding Slots
12
Part 2 - Winding New Trimming Line onto the Inner Reel
• If using single line, refer to Winding Single Line.
• If using split line, refer to Winding Split Line.
• If using a prewound inner reel, proceed to Part 3 - Installing the
Inner Reel.
Winding Single Line
1. Cut one 12-foot (3.7 m) length of new single trimming line. Fold
the line in half to create a loop in the middle.
2. Insert the loop into the slot in the split wall (Fig. 13). Wind the
line tightly in the direction shown on the bottom of the inner reel
until about 6 inches (150 mm) of line remains. Keep the top half
of the line above the split wall and the bottom half of the line
below the split wall.
3. Insert the two 6-inch sections into the two .095 holding slots
(Fig. 15).
NOTE: Failure to wind the line in the direction indicated will cause
the cutting head to operate incorrectly.
Proceed to Part 3 - Installing the Inner Reel.
Winding Split Line
1. Cut one 6-foot (1.8 m) length of new split line trimming line. Split
each end about 6 inches (150 mm).
2. Using one split end, insert one line into the top hole and the
other line into the bottom hole in the inner reel (Fig. 14).
3. Wind the line tightly in the direction shown on the bottom of the
inner reel. The split wall will automatically divide the line. Wind
the line until it is completely divided and about 6 inches (150
mm) of line remains.
NOTE: Failure to wind the line in the direction indicated will cause
the cutting head to operate incorrectly.
4. Insert the two 6-inch sections into the two .095 holding slots
(Fig. 15).
Proceed to Part 3 - Installing the Inner Reel.
Part 3 - Installing the Inner Reel
1. Pass the two line ends through the eyelets in the outer spool.
Place the spring inside the inner reel. Insert the inner reel into
the outer spool. Push the inner reel and outer spool together
(Fig. 16).
NOTE: The spring must be assembled on the inner reel before
reassembling the cutting head.
2. While holding the inner reel and outer spool together, firmly pull
the two line ends to release them from the holding slots.
3. While holding the inner reel and outer spool together, screw the
bump knob on clockwise. Tighten the bump knob securely.
Fig. 13
Slot
Split Wall
Fig. 14
Top Hole
Bottom Hole
Split
Wall
Fig. 15
Holding
Slots
Fig. 16
Outer Spool
Bump Knob
Inner ReelSpring
Eyelets
13
MAINTAINING THE AIR FILTER
Failure to maintain the air filter can result in poor performance or can
cause permanent damage to the engine. Engine failure due to
improper air filter maintenance is not covered by the product warranty.
Cleaning the Air Filter
1. Open the air filter cover: press in the lock tab and swing the air
filter cover to the right (Fig. 17).
2. Remove the air filter from inside the air filter cover (Fig. 17).
3. Wash the air filter in detergent and water. Rinse the air filter
thoroughly and allow it to dry.
4. Lightly coat the air filter with clean SAE 30 oil.
5. Squeeze the air filter to spread and remove excess oil.
6. Reinstall the air filter inside the air filter cover (Fig. 17).
NOTE: Operating the unit without the air filter and air filter cover will
VOID the warranty.
7. Close the air filter cover: swing the air filter cover to the left and
press it closed until the lock tab snaps into place (Fig. 17).
WARNING:
To avoid serious personal injury, always stop
the engine and allow it to cool before cleaning or maintaining
the unit.
Fig. 17
Air Filter
Air Filter Cover
Lock Tab
Fig. 18
Idle Speed Screw
ADJUSTING THE IDLE SPEED
NOTE: Careless adjustments can seriously damage the unit. An
authorized service dealer should make carburetor adjustments.
If, after checking the fuel and cleaning the air filter, the engine still
will not idle, adjust the idle speed screw as follows:
1. Start the engine. Refer to Starting and Stopping.
2. Release the throttle control and let the engine idle.
• If the engine stops, use a small Phillips screwdriver to turn the
idle speed screw clockwise, 1/8 of a turn at a time (as needed)
until the engine idles smoothly (Fig. 18).
• If the engine idles too quickly, turn the idle speed screw
counterclockwise, 1/8 of a turn at a time (as needed) to reduce
the idle speed (Fig. 18).
NOTE: The cutting head should not spin when the engine idles. If it
does, reduce the idle speed until the cutting head stops moving.
Checking the fuel, cleaning the air filter, and adjusting the idle speed
should solve most engine problems. If not, and any of the following
conditions are true, take the unit to an authorized service dealer:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
WARNING:
The cutting head may spin during idle speed
adjustments. Wear protective clothing and observe all
safety instructions to prevent serious personal injury.
14
CLEANING AND STORAGE
CLEANING
Use a small brush to clean the outside of the unit. Do not use strong
detergents. Household cleaners that contain aromatic oils such as
pine and lemon, and solvents such as kerosene, can damage
plastic. Wipe off any moisture with a soft cloth.
STORAGE
• Never store a fueled unit where fumes may reach an open flame
or spark.
• Allow the engine to cool before storing.
• Lock up the unit to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
Short-term Storage (1-2 weeks)
1. Store the unit in a horizontal position. If this is not possible, store
the unit vertically with the engine at the top.
Long-term Storage
1. Remove the fuel cap, tip the unit and drain the fuel into an
approved container. Reinstall the fuel cap.
2. Start the engine and allow it to run until it stalls. This ensures
that all fuel has been drained from the carburetor.
3. Allow the engine to cool. Remove the spark plug and put 5
drops of any high-quality motor oil or 2-cycle oil into the
cylinder. Pull the starter rope slowly to distribute the oil. Reinstall
the spark plug.
4. Thoroughly clean the unit and inspect it for any loose or
damaged parts. Repair or replace damaged parts and tighten
loose screws, nuts or bolts.
Preparing the Unit for Use after Long-term Storage
1. Remove the spark plug and drain all of the oil from the cylinder.
NOTE: Do not use fuel that has been stored for more than 30 days.
Dispose of old fuel according to federal, state and local regulations.
WARNING:
To avoid serious personal injury, always stop
the engine and allow it to cool before cleaning or maintaining
the unit.
Fig. 19
0.025 in.
(0.635 mm)
MAINTAINING THE SPARK PLUG
1. Stop the engine and allow it to cool. Grasp the spark plug boot
firmly and pull it from the spark plug.
2. Clean around the spark plug. Remove the spark plug from the
cylinder head with a 5/8-inch socket, turning counterclockwise.
3. Inspect the spark plug. If the spark plug is cracked, fouled or
dirty, replace it with a replacement part #753-06193, a
Champion RDJ7J or an equivalent spark plug.
4. Use a feeler gauge to set the air gap at 0.025 in. (0.635 mm)
(Fig. 19).
5. Install the spark plug in the cylinder head. Tighten the spark plug
with a 5/8-inch socket, turning it clockwise until snug.
NOTE: If using a torque wrench, torque to:
110-120 in.•lb. (12.3-13.5 N•m). Do not over tighten.
6. Reattach the spark plug boot.
WARNING:
Do not sand blast, scrape or clean spark plug
electrodes. Grit in the engine could damage the cylinder.
15
If further assistance is required, contact an authorized service dealer.
The cutting head is bound with grass Stop the engine and clean the cutting head
The cutting head is out of line Refill the cutting head with new line
The inner reel is bound up Rewind the line
The cutting head is dirty Clean the inner reel and outer spool
The line is welded Open the cutting head and remove the welded section
The line is twisted Rewind the line
Not enough line is extended
Stop the unit, push the bump knob and pull the line until 4 inches
(102 mm) is outside of the cutting head
There is oil, cleaner or lubricant in the cutting head Clean and thoroughly dry the cutting head
The fuel tank is empty Fill the fuel tank with properly mixed fuel
The primer bulb was not pressed enough Press the primer bulb 10 times or until fuel is visible
The engine is flooded
Move the choke lever to Position 3, squeeze the throttle control and
pull the starter rope
The fuel is old (over 30 days) and/or improperly mixed Drain the fuel tank and add fresh, properly mixed fuel
The spark plug is fouled Replace the spark plug
TROUBLESHOOTING
The fuel is old (over 30 days) and/or improperly mixed Drain the fuel tank and add fresh, properly mixed fuel
The cutting head is bound with grass Stop the engine and clean the cutting head
The air filter is dirty Clean or replace the air filter
PROBLEM SOLUTION
The air filter is dirty Clean or replace the air filter
The fuel is old (over 30 days) and/or improperly mixed Drain the fuel tank and add fresh, properly mixed fuel
The idle speed is incorrect Adjust the idle speed
The fuel is old (over 30 days) and/or improperly mixed Drain the fuel tank and add fresh, properly mixed fuel
The air filter is dirty Clean or replace the air filter
The spark plug is fouled Replace the spark plug
THE ENGINE WILL NOT START
THE ENGINE WILL NOT IDLE
THE ENGINE WILL NOT ACCELERATE
THE ENGINE LACKS POWER OR STALLS
THE CUTTING HEAD WILL NOT ADVANCE LINE
THE CUTTING LINE ADVANCES UNCONTROLLABLY
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