Troy-Bilt TB90BC User Manual [en, es, fr]
Operator’s Manual
2-Cycle Gasoline
Trimmer /
Brushcutter
Model TB90BC
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, Accessory Part 791-
180890 Spark Arrestor Screen is available by contacting the service department at Troy-Bilt LLC, P.O. Box 361131 Cleveland, Ohio 44136-0019.
IMPORTANT:READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
TROY-BILT LLC, P.O. BOX 361131, CLEVELAND, OH 44136-0019
P/N 792-10820 (01/02 rev. P00)
PRINTED IN USA
2
TABLE OF CONTENTS
Content Page
Calling Customer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Know Your Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Oil and Fuel Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Starting/Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maintenance and Repair Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Accessories and Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
This Operator’s Manual is an important part of your new Trimmer/Brushcutter. It will help you assemble, prepare
and maintain the unit for best performance. Please read and understand what it says.
Before you start assembling your new equipment, please locate the model plate on the equipment and copy the
information from it in the space provided below. This information is very important if you need help from our
Customer Support Department or an authorized dealer.
• You can locate the model number by looking at the underside of the engine. A sample model plate is
explained below. For future reference, please copy the model number and the serial number of the equipment
in the space below
If you have difficulty assembling this product or have any questions regarding the controls, operation or
maintenance of this unit, please call the Customer Support Department.
Call 1- (330) 558-7220 or 1- (866) 840-6483 to reach a Customer Support representative. Please have
your unit’s model number and serial number ready when you call. See previous section to locate this
information. You will be asked to enter the serial number in order to process your call .
Copy the model / parent part
number here:
Copy the serial number here:
FINDING MODEL NUMBER
CALLING CUSTOMER SUPPORT
For more details about your unit, visit our website at www.troybilt.com
RULES FOR SAFE OPERATION
3
DANGER: Failure to obey a safety warning
will result in serious injury to yourself or to
others. Always follow the safety precautions
to reduce the risk of fire, electric shock, and
personal injury.
WARNING: Failure to obey a safety warning
can result in injury to yourself and others.
Always follow the safety precautions to
reduce the risk of fire, electric shock, and
personal injury.
CAUTION: Failure to obey a safety warning
may result in property damage or personal
injury to yourself or to others. Always follow
the safety precautions to reduce the risk of
fire, electric shock, and personal injury.
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.
SYMBOL MEANING
SAFETY ALERT SYMBOL: Indicates
danger, warning, or caution. Attention is
required in order to avoid serious personal
injury. May be used in conjunction with other
symbols or pictographs.
NOTE: Advises you of information or instructions vital
to the operation or maintenance of the equipment.
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 and teens under the age of 15 must not use
the unit, except for teens guided by an adult.
• Inspect the unit before use. Replace damaged parts.
Check for fuel leaks. Make sure all fasteners are in
place and secure. Replace cutting attachment parts
that are cracked, chipped, or damaged in any way.
Make sure the cutting attachment is properly installed
and securely fastened. Be sure the cutting attachment
shield is properly attached, and positioned as
recommended. Failure to so can result in personal
injury to the operator and bystanders, as well as
damage to the unit.
• Use only 0.105 inch (2.667 mm) diameter genuine
Troy-Bilt LLC replacement line. Never use metalreinforced line, wire, or rope, etc. These can break off
and become a dangerous projectile.
• Be aware of the risk of injury to the head, hands and
feet.
• Clear the area to be cut before each use. Remove all
objects such as rocks, broken glass, nails, wire, or
string which can be thrown or become entangled in
the cutting attachment. 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 be encouraged to wear
eye protection. If you are approached, stop the engine
and cutting attachment immediately.
• Squeeze the throttle control and check that it returns
automatically to the idle position. Make all adjustments
or repairs before using unit.
SAFETY WARNINGS FOR GAS TRIMMERS
WARNING: Gasoline is highly flammable, and its vapors
can explode if ignited. Take the following precautions:
• 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 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.
• 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.
• Avoid creating a source of ignition for spilled fuel. Do
not start the engine until fuel vapors dissipate.
• Move the unit at least 30 feet (9.1 m) from the fueling
source and site before starting the engine. Do not
smoke. Keep sparks and open flames away from the
area while adding fuel or operating the unit.
WHILE OPERATING
• 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.
• 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.
WARNING
California Proposition 65 Warning:
THE ENGINE EXHAUST FROM THIS
PRODUCT CONTAINS CHEMICALS
KNOWN TO THE STATE OF CALIFORNIA
TO CAUSE CANCER, BIRTH DEFECTS
OR OTHER REPRODUCTIVE HARM.
RULES FOR SAFE OPERATION
4
• 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 attachment shield must always be in place
while operating the unit. Do not operate 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 attachment remains
stationary when the engine is idling. If it does not, have
the unit adjusted by an authorized service technician.
• Adjust the J-Handle to your size to provide the best
grip.
• Be sure the cutting 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. See
Starting/Stopping Instructions.
• Use the right tool. Only use this tool for the purpose
intended.
• Do not overreach. Always keep proper footing and
balance.
• Always hold the unit with both hands when operating.
Keep a firm grip on both the front and rear handle or
grips.
• Keep hands, face, and feet at a distance from all
moving parts. Do not touch or try to stop the cutting
attachment when it is rotating.
• Do not touch the engine, gear housing or muffler.
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 cut, trim or edge. Do not run the engine at
high speed when not cutting.
• Always stop the engine when cutting is delayed or
when walking from one cutting location to another.
• If you strike or become entangled with a foreign
object, stop the engine immediately and check for
damage. Do not operate before repairing damage. Do
not operate the unit with loose or damaged parts.
• Stop and switch the engine to off for maintenance,
repair, or for changing the cutting attachment or other
attachments.
• Use only genuine manufacturer’s replacement parts and
accessories for this unit. These are available from
your authorized service dealer. Use of any non Troy-Bilt
LLC parts or accessories could lead to serious injury to
the user, or damage to the unit, and void your warranty.
• Keep unit clean of vegetation and other materials.
They may become lodged between the cutting
attachment and shield.
• 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.
WHILE OPERATING WITH CUTTING BLADE
• Read and understand all safety warnings before
operating this unit.
• Always use the shoulder harness when using the
brush blade accessory.
• Keep the J-handle between the operator and cutting
attachment or blade at all times.
• NEVER cut with the cutting blade located over 30
inches (76 cm) or more above the ground level.
• Blade thrust may occur when the spinning blade
contacts an object that it does not immediately cut.
Blade thrust can be violent enough to cause the unit
and/or operator to be propelled in any direction , and
possibly lose control of the unit. Blade thrust can
occur without warning if the blade snags, stalls or
binds. This is more likely to occur in areas where it is
difficult to see the material being cut.
• For operation with the brush blade, do not cut
anything thicker than 1/2 inch or a violent kickback
could occur.
• Do not attempt to touch or stop the blade when it is
rotating.
•A coasting blade can cause injury while it continues to
spin after the engine is stopped or the throttle trigger
is released. Maintain proper control until the blade has
completely stopped rotating.
• Do not run the unit at high speed when not cutting.
• If you strike or become entangled with a foreign
object, stop the engine immediately and check for
damage. Have any damage repaired before attempting
further operations. Do not operate unit with a bent,
cracked or dull blade. Discard blades that are bent,
warped, cracked or broken.
• Do not sharpen the cutting blade. Sharpening the
blade can cause the blade tip to break off while in use.
This can result in severe personal injury. Replace the
blade.
• Do not use the cutting blade for edging or as an
edger, severe personal injury to yourself or others can
occur. Use the cutting blade only for the purpose as
described in this manual.
• Stop the engine IMMEDIATELY if you feel excessive
vibration. Vibration is a sign of trouble. Inspect
thoroughly for loose nuts, bolts or damage before
continuing. Repair or replace affected parts as
necessary.
AFTER USE
• Clean cutting blades with a household cleaner to
remove any gum buildup. Oil the blade with machine
oil to prevent rust.
• Lock up and store the cutting blade in an appropriate
area to protect the blade from unauthorized use or
damage.
RULES FOR SAFE OPERATION
5
SAFETY AND 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
• SAFETY ALERT SYMBOL
Indicates danger, warning, or caution. May be used in conjunction with other
symbols or pictographs.
•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
WARNING:
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. Use a full face shield when needed.
• KEEP BYSTANDERS AWAY
WARNING:
Keep all bystanders, especially children and pets, at least 50 feet (15 m)
from the operating area.
• PRIMER BULB
Push primer bulb, fully and slowly, 5 to 7 times.
• UNLEADED FUEL
Always use clean, fresh unleaded fuel.
OTHER SAFETY WARNINGS
• 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 transporting.
Be sure to secure the unit while transporting.
• Store the unit in a dry area, locked up or up high
to prevent unauthorized use or damage, out of the
reach of children.
• Never douse or squirt the unit with water or any other
liquid. Keep handles dry, clean and free from debris.
Clean after each use, see Cleaning and Storage
instructions.
• Keep these instructions. Refer to them often and use
them to instruct other users. If you loan someone this
unit, also loan them these instructions.
SAVE THESE INSTRUCTIONS
RULES FOR SAFE OPERATION
6
SYMBOL MEANING
• OIL
Refer to operator's manual for the proper type of oil.
• THROWN OBJECTS AND ROTATING CUTTER CAN CAUSE SEVERE INJURY
WARNING:
Do not operate without the cutting attachment shield in place.
Keep away from the rotating cutting attachment.
• ON/OFF STOP CONTROL
ON / START / RUN
• ON/OFF STOP CONTROL
OFF OR STOP
• HOT SURFACE WARNING
Do not touch a hot muffler, gear housing 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 cutting attachment shield. To prevent serious injury, do not
touch line cutting blade.
• BRUSHCUTTERS • Replace dull blade.
Do not sharpen the cutting blade. Sharpening the blade can cause the blade tip to
break off while in use. This can result in severe personal injury.
• TRIMMER/BRUSHCUTTER SAFETY
WARNING: Thrown objects and rotating cutter can cause severe injury. Keep bystanders,
especially children and pets, at least 50 feet (15 m.) away from the cutting area. The cutting
attachment shield must be used when using the trimmer cutting attachment.
RULES FOR SAFE OPERATION
7
APPLICATIONS
As a trimmer:
• Cutting grass and light weeds.
• Edging.
• Decorative trimming around trees, fences, etc.
As a brushcutter;
• Cutting weeds and light bush of up to 1/2 inch in
diameter.
Other optional accessories may be used with the
TB90BC. See list of add-ons on page 14.
Cutting Attachment
Shield
Fuel Cap
Throttle
Control
Throttle
Lock-Out
J-Handle
Cutting Attachment
Gear Housing
Shaft Grip
Primer Bulb
EZ-Start™
Lever
Air Filter/Muffler
Cover
Engine Stand
Spark Plug
On/Off Stop Control
Shaft
Housing
Starter Rope Grip
KNOW YOUR UNIT
EZ-Link™
Blade Shield /
Shield Mount
Brush
Blade
Line Cutting Blade
Spark Plug
Muffler
Shoulder Strap Clip
ASSEMBLY INSTRUCTIONS
8
6. While holding the unit in the operating position
(Fig. 3), position the J-handle to the location
that provides you the best grip.
7. Tighten the clamp screws evenly, until the J-handle
is secure.
INSTALLING THE HARNESS
WARNING: Always use the shoulder harness
when using the cutting blade to avoid serious
personal injury.
1. Push the strap through the center of the buckle.
2. Pull the strap over the cross bar and down through
the slot in the buckle (Fig. 4).
Decal
Fig. 1
Fig. 4
Fig. 6
Fig. 5
Fig. 2
Fig. 3
3. Put the harness on over head and onto shoulder.
Snap it on to the support fitting (Fig. 5).
Support Fitting
4. Adjust length to fit the operator’s size. Pull tab to
lengthen, pull strap to shorten (Fig 6).
INSTALLING AND ADJUSTING THE J-HANDLE
1. Place the J-handle between the top and middle
clamp pieces (Fig. 1).
2. While holding the three pieces together, install the
four (4) screws through the top clamp and into
middle clamp.
NOTE: The holes in the top and middle clamp will line up
only when assembled correctly.
3. Place the clamps and J-handle the over the shaft
housing and onto the bottom clamp.
4. Hold each hex nut in the bottom clamp recess with a
finger. Start screws with a large Phillips screwdriver.
Do not tighten until you make the handle adjustment.
5. Slide the J-handle in or out until the arrow/white line
on the decal touches the clamp assembly (Fig. 2).
(4) Screws
Top Clamp
J-Handle
Middle Clamp
Bottom Clamp
Nuts
ASSEMBLY INSTRUCTIONS
9
Install the cutting attachment shield when using the
unit as a grass trimmer.
WARNING: To avoid serious personal injury,
the cutting attachment shield SHALL be in
place at all times while operating the unit as
a grass trimmer.
Install the cutting attachment shield on the shield mount
by inserting the three (3) screws into the shield mount.
Tighten securely with a flat blade screwdriver (Fig. 7).
REMOVE THE CUTTING ATTACHMENT AND
INSTALL THE CUTTING BLADE
NOTE: To make removing or installing the cutting blade
or cutting attachment easier, place the unit on
the ground or on a work bench.
Remove the Cutting Attachment Shield
See Removing and Installing Cutting Attachment Shield,.
Remove the Cutting Attachment
WARNING: The gear housing gets hot with
use and can result in injury to the operator.
When the unit is turned off it remains hot for
a short time. Do not touch the gear housing
until it has cooled.
1. Align the shaft bushing hole with the locking rod slot
and insert the locking rod into the shaft bushing hole
(Fig. 8).
REMOVING AND INSTALLING CUTTING
ATTACHMENT SHIELD
Remove the cutting attachment shield when using
the unit as a brushcutter.
WARNING: The cutting attachment shield
should NOT be installed when operating the
unit with a blade. Remove the cutting
attachment shield before removing or
installing the blade.
Remove the cutting attachment shield from the shield
mount by removing the three (3) screws with a flat blade
screwdriver (Fig. 7). Store parts for future use.
(3) Screws
Cutting
Attachment
Shield
Shield Mount
Gear Housing
Fig. 7
Cutting Attachment
Locking Rod
Slot
Locking Rod
Shaft Bushing Hole
Locking Rod Slot
Output Shaft
Bushing
Locking Rod
Output Shaft
2. Hold the locking rod in place by grasping it next to
the boom of the unit (Fig. 9).
3. While holding the locking rod, remove the cutting
attachment by turning it clockwise off of the output
shaft (Fig. 10). Store the cutting attachment for future
use.
NOTE: The blade retainer under the cutting attachment
will be used when installing the cutting blade.
Fig. 8
Fig. 9
Fig. 10
10
ASSEMBLY INSTRUCTIONS
Shield
Mount
Locking Rod
Cutting
Blade
Blade Retainer
Nut
Output Shaft
Bushing
Pilot Hole
Fig. 12
Fig. 11
Pilot Step
Install the Cutting Blade
WARNING: To avoid serious personal injury,
always wear gloves while handling or
installing the blade.
4. Place the cutting blade on the output shaft bushing
(Fig. 11).
5. Make sure that the cutting blade is centered on the
pilot step and sitting flat against the output shaft
bushing (Fig. 12).
WARNING: If the cutting blade is off-center,
the unit will vibrate, and the blade may fly
off, which can cause serious personal injury.
Fig. 13
1/4-1/2 turn
Counterclockwise
6. Align the shaft bushing hole with the locking rod
slot and insert the locking rod into the bushing hole
(Fig. 8, Pg. 9).
7. Put the blade retainer and nut on the output shaft.
Make sure that the blade is installed correctly.
8. Tighten nut counterclockwise against the blade while
holding the locking rod;
• If using a torque wrench and an 5/8 inch socket tighten
to: 325 - 335 in•lb, 27 - 28 ft.•lb, 37 - 38 N•m.
• Without a torque wrench, use a 5/8 inch closed-end or
socket wrench, turning the nut until the blade retainer
is snug against the shaft bushing. Make sure that the
blade is installed correctly, then rotate the nut an
additional 1/4 to 1/2 turn counterclockwise (Fig. 13).
9. Remove the locking rod from the locking rod slot.
WARNING: To avoid serious personal injury
or damage to the unit, do not start or
operate this unit with the locking rod in the
locking rod slot.
WARNING: Do not sharpen the cutting blade.
Sharpening the blade can cause the blade tip
to break off while in use. This can result in
severe personal injury. Replace the blade.
REMOVE THE CUTTING BLADE AND INSTALL
THE CUTTING ATTACHMENT
Remove the Cutting Blade
WARNING: To avoid serious personal injury,
always wear gloves while handling or
installing the blade.
1. Align the shaft bushing hole with the locking rod
slot and insert the locking rod into the bushing hole
(Fig. 8, Pg. 9).
2. Hold the locking rod in place by grasping it next to
the boom of the unit (Fig. 14).
Clockwise
Fig. 14
ASSEMBLY INSTRUCTIONS
11
3. While holding the locking rod, loosen the nut on
the blade by turning it clockwise with a 5/8 inch
closed-end or socket wrench (Fig. 14).
4. Remove the nut, blade retainer, and blade. Store the
nut and blade together for future use in a secure
place. Store out of reach of children.
Install the Cutting Attachment
5. Align the shaft bushing hole with the locking rod slot
and insert the locking rod into the shaft bushing hole.
(Fig. 8, Pg. 9). Place the blade retainer on the output
shaft with the flat surface against the output shaft
bushing as shown in Fig. 15. Screw the cutting
attachment counterclockwise onto the output shaft.
Tighten securely.
NOTE: The blade retainer must be installed on the
output shaft in the position shown for the cutting
attachment to work correctly.
6. Remove the locking rod.
7. Install the cutting attachment shield. See Removing
and Installing Cutting Attachment Shield, Pg. 9.
Cutting Attachment
Locking Rod
Blade Retainer
Output Shaft
Bushing
Fig. 15
WARNING: To avoid serious personal injury,
the cutting attachment shield SHALL be in
place at all times while operating the unit as
a grass trimmer.
OIL AND FUEL INFORMATION
12
OIL AND FUEL 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
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. It forms acids
when stored. When using alcohol-blended fuel, use fresh
fuel (less than 60 days old).
Using Blended Fuels
If you choose to use a blended fuel, or its use is
unavoidable, follow recommended precautions.
• Always use fresh fuel mix per your operator's manual.
• 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 Troy-Bilt 2-Cycle oil that came with your
unit contains a fuel additive which will help inhibit
corrosion and minimize the formation of gum deposits.It
is recommended that you use only Troy-Bilt 2-Cycle oil
with this unit.
If unavailable, use a good 2-cycle oil designed for
air-cooled engines along with a fuel additive, such as
STA-BIL® Gas 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.
CAUTION: For proper engine operation and
maximum reliability, pay strict attention to
the oil and fuel mixing instructions on the 2cycle oil container. 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 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.
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 the table below for specific gas and oil mixing
ratios.
NOTE: One gallon (3.8 liters) of unleaded gasoline mixed
with one 4 oz. (120 ml.) bottle of Troy-Bilt 2 Cycle
oil makes a 32:1 fuel/oil ratio.
+
UNLEADED GAS TROY-BILT 2 CYCLE OIL
1 US. GALLON + 4.0 FL. OZ.
(3.8 LITERS) (120 ml)
1 LITER + 30 ml
MIXING RATIO - 32:1
STARTING/STOPPING INSTRUCTIONS
13
Fig. 16
Fig. 17
Fig. 18
On/Off Stop ControlStart/On (I)
Stop/Off (O)
Throttle Lock-Out
Throttle Control
STARTING INSTRUCTIONS
WARNING:
Operate this unit only in a wellventilated area outdoors. Carbon monoxide
exhaust fumes can be lethal in a confined area.
WARNING: Avoid accidental starting. Be in
the starting position when pulling the starter
rope (Fig. 9). The operator and unit must be
in a stable position while starting to avoid
serious personal injury.
Avoid serious personal injury, ensure any
Add-On being used is installed correctly
and secure before starting unit.
1. Mix gas with oil. Fill fuel tank with fuel/oil mixture.
See Oil and Fuel Mixing Instructions Pg. 12.
2. Put the On/Off Stop Control in the ON (I) position
(Fig. 16).
3. Fully press and release primer bulb slowly 5 to 7
times. Fuel should be visible in the bulb (Fig. 17).
If fuel is not visible, press three (3) more times, or
until it is.
4. Push the EZ-Start™ Lever to the left until it clicks and
locks into place. (Fig. 17).
5. With the unit in the starting position (Fig. 18). DO NOT
SQUEEZE THE THROTTLE CONTROL. Pull the
starter rope briskly 5 times in the with the EZ-Start™
lever pushed to the left. If the engine starts to run
before the fifth pull, proceed to step 7.
NOTE: When starting, the EZ-Start™ Lever will
automatically click off when the throttle control is
squeezed.
NOTE: If the engine floods while trying to start. Squeeze
the throttle control (Fig. 16). Pull the starter rope
briskly. The engine should start within three (3) to
eight (8) pulls.
6. Squeeze the throttle control to warm up engine for 5
to 10 seconds. Ez-Start™ Lever will click off
automatically (Fig. 17).
NOTE: If enige stalls while squeezing trigger, continue to
squeeze trigger and pull starter rope until the
trimmer starts. (Fig. 18)
NOTE: Choking is unnecessary when starting a warm
engine. Put the On/Off Stop Control in the ON
position (Fig. 3), squeeze the throttle and pull the
starter rope briskly. (Fig. 18).
STOPPING INSTRUCTIONS
1. Release your hand from the throttle control (Fig. 18).
Allow the engine to cool down by idling.
2. Put the On/Off Stop Control in the OFF (O) position
(Fig. 16).
Starter Rope
Throttle Control
EZ-Start™
Lever
Primer Bulb
OPERATING INSTRUCTIONS
OPERATING THE EZ-LINK™SYSTEM
The EZ-Link™ system enables the use of these
optional add-ons.
Blower/Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . BV720r
Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720r
Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720r
Hedge Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . HS720r
Snow Thrower . . . . . . . . . . . . . . . . . . . . . . . . . . . ST720r
Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . . SS725r
Sweeper/Blower . . . . . . . . . . . . . . . . . . . . . . . . . . SB720r
Tree Pruner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TP720r
Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720r
WARNING: Read and understand operator’s
manual for add-on prior to operation.
Removing the Cutting Attachment or Add-Ons:
1. Turn the knob counterclockwise to loosen (Fig. 19).
2. Press and hold the release button (Fig. 19).
3. While firmly holding the upper shaft housing, pull
the cutting attachment or add-on straight out of the
EZ-Link™ coupler (Fig. 20).
Installing the Cutting Attachment or Add-Ons:
WARNING: To avoid serious personal injury
and damage to the unit, shut unit off before
removing or installing add-ons.
NOTE: To make installing or removing the add-on easier,
place the unit on the ground or on a work bench.
1. Turn knob counterclockwise to loosen (Fig. 21).
Fig. 19
EZ-Link™ Coupler
Release Button
Guide Recess
Knob
Primary Hole
Upper Shaft Housing
90˚ Edging Hole
(Trimmer only)
EZ-Link™ Coupler
2. While firmly holding the add-on, push it straight into
the EZ-Link™ coupler (Fig. 20).
NOTE: Aligning the release button with the guide recess
will help installation (Fig. 19).
3. Turn the knob clockwise to tighten (Fig. 21).
CAUTION: Lock the release button in the
primary hole and securely tighten the knob
before operating this unit.
Fig. 20
Fig. 21
Knob
180˚ Edging Hole
(Trimmer only)
Lower Shaft Housing
Release Button
CAUTION: The cutting attachment and
add-ons with the EZ-Link™ system are to be
used in the primary hole unless stated
otherwise in the specific add-ons operator’s
manual. Using the wrong hole could lead to
personal injury, or damage to the unit.
For edging when using the line head cutting attachment
with EZ-Link™ models, lock the release button of the
cutting attachment into the 90° edging hole or the 180°
edging hole (Fig. 21).
WARNING: Do not use the cutting blade for
edging or as an edger, severe personal injury
to yourself or others can occur.
14
OPERATING INSTRUCTIONS
15
Each time the head is bumped, about 1 inch (25.4 mm.)
of trimming line is released. A blade in the cutting
attachment shield will cut the line to the proper length if
excess line is released.
For best results, tap the Bump Head™ on bare ground
or hard soil. If line release is attempted in tall grass, the
engine may stall. Always keep the trimming line fully
extended. Line release becomes more difficult as the
cutting line becomes shorter.
NOTE: Do not rest the Bump Head™ on the ground
while the unit is running .
CAUTION: Do not remove or alter the line
cutting blade assembly. Excessive line length
will make the clutch overheat. This may lead
to serious personal injury or damage to the
unit.
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or fence
posts
TIPS FOR BEST TRIMMING RESULTS
• Keep the cutting attachment parallel to the ground.
• Do not force the cutting attachment. Allow the tip of
the line to do the cutting, especially along walls.
Cutting with more than the tip will reduce cutting
efficiency and may overload the engine.
• Cut grass over 8 inches (200 mm) by working from
top to bottom in small increments to avoid
premature line wear or engine drag.
• Cut from left to right whenever possible. Cutting to
the right improves the unit's cutting efficiency.
Clippings are thrown away from the operator.
• Slowly move the trimmer into and out of the cutting
area at the desired height. Move either in a forwardbackward or side-to-side motion. Cutting shorter
lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon;
• Following the previous trimming techniques
• What vegetation is being cut
• Where it’s being cut
For example, the line will wear faster when trimming
against a foundation wall as opposed to trimming
around a tree.
HOLDING THE TRIMMER
WARNING: Always wear eye, hearing, foot,
body protection and strap to reduce the risk
of injury when operating this unit.
Before operating the unit, stand in the operating position
(Fig. 22). Check for the following:
• The operator is wearing eye protection and proper
clothing.
• The right arm is slightly bent, and the hand is holding
the shaft grip.
• The left arm is straight, and the hand is holding the
J-handle.
• The unit is at waist level.
• The cutting attachment is parallel to the ground and
easily contacts the vegetation to be cut without the
operator having to bend over.
Fig. 22
ADJUSTING TRIMMING LINE LENGTH
The Bump Head™ cutting attachment allows you to
release trimming line without stopping the engine. To
release more line, lightly tap the cutting attachment on
the ground (Fig. 23) while operating the trimmer at high
speed.
NOTE: Always keep the trimming line fully extended.
Line release becomes more difficult as cutting
line becomes shorter
Fig. 23
OPERATING INSTRUCTIONS
16
Fig. 24
Fig. 25
Fig. 26
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all
vegetation around trees, posts, fences, etc.
Rotate the whole unit so that the cutting attachment is at
a 30° angle to the ground (Fig. 24).
USING THE CUTTING BLADE
WARNING: Always wear eye, hearing, foot,
body protection and the strap to reduce the
risk of injury when operating this unit.
WARNING: Do not use the cutting blade for
edging or as an edger, severe personal injury
to yourself or others can occur.
Before operating the unit with the cutting blade stand in
the operating position (Fig. 25).
Cutting Blade Operating Tips:
To establish a rhythmic cutting procedure:
• Plant feet firmly, comfortably apart.
• Bring the engine to full throttle before entering the
material to be cut. The blade has maximum cutting
power at full throttle and is less likely to bind, stall, or
cause blade thrust, which can result in serious
personal injury to the operator or others.
WARNING: Blade thrust may occur when the
spinning blade contacts an object that it
does not immediately cut. Blade thrust can
be violent enough to cause the unit and/or
operator to be propelled in any direction, and
possibly lose control of the unit. Blade thrust
can occur without warning if the blade snags,
stalls or binds. This is more likely to occur in
areas where it is difficult to see the material
being cut.
• Cut while swinging the upper part of your body from
right to left.
• Always release the throttle trigger and allow the engine
to return to idle speed when not cutting.
• When done, always unsnap unit from harness before
taking harness off.
WARNING: The blade continues to spin after
the engine is turned off. The coasting blade
can seriously cut you if accidentally touched.
• Swing the unit in the same direction as the blade
spins, which increases the cutting action.
• Move forward to the next area to be cut after the
return swing and plant feet again.
• The cutting blade is designed with a second cutting
edge, which can be used by removing the blade,
turning it upside down, and reinstalling it.
WARNING: Do not sharpen the cutting
blade. Sharpening the blade can cause the
blade tip to break off while in use. This can
result in severe personal injury to yourself or
others. Replace the blade.
To reduce the chance of material wrapping around the
blade, follow these steps:
• Cut at full throttle.
• Swing the unit into material to be cut from your right to
your left (Fig. 26).
• Avoid the material just cut as you make the return
swing.
WARNING: Do not clear away cut material
with the engine running or blade turning. To
avoid serious personal injury, turn off engine.
Allow the blade to stop before removing
materials wrapped around the blade shaft.
MAINTENANCE AND REPAIR INSTRUCTIONS
17
WARNING: To prevent serious injury, never
do 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.
NOTE: Some maintenance procedures may require
special tools or skills. If you are unsure about
these procedures take your unit to an authorized
service dealer.
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.
Winding the Existing Inner Reel
1. Hold the outer spool with one hand and unscrew the
Bump Knob clockwise (Fig. 27). Inspect the bolt
inside the bump knob to make sure it moves freely.
Replace the bump knob if damaged.
2. Remove the inner reel from the outer spool (Fig. 27).
3. Remove spring from the inner reel (Fig. 27).
4. Use a clean cloth to clean the the inner reel, spring,
shaft, and inner surface of the outer spool (Fig. 28).
Inner Reel
Spring
Outer Spool
Bump Knob
Bolt
Fig. 27
LINE INSTALLATION
This section covers both SplitLine™ and standard single
line installation.
Always use geniune Troy-Bilt™ 0.105 in. (2.667 mm)
replacement line. Line other than specified may make the
engine overheat or fail.
WARNING: Never use metal-reinforced line,
wire, chain, or rope, etc. These can break off
and become dangerous projectiles.
There are two methods to replace the trimming line.
• Wind the inner reel with new line
• Install a prewound inner reel
Indexing Teeth
Fig. 28
Fig. 29
FREQUENCY MAINTENANCE REQUIRED REFER TO:
Before Starting Engine Fill fuel tank with correct oil and fuel mixture. Page 12
Every 10 Hours Clean and re-oil air filter. Page 19
Every 25 Hours Check spark arrestor and clean. Page 20
Check spark plug condition and gap. Page 22
Every 50 Hours Inspect exhaust port and spark arrestor screen for clogging Page 20
or obstruction to assure maximum performance levels.
NOTE: Maintenance, Replacement, or Repair of the
emission control devices and system may be
performed by any non-road engine repair
establishment, individual or authorized service
dealer.
In order to assure peak performance of your engine,
inspection of the engine exhaust port may be necessary
after 50 hours of operation. If you notice lost RPM, poor
performance or general lack of acceleration, this service
may be required. If you feel your engine is need of this
inspection, refer service to an authorized servicing
dealer, or establishment for repair. DO NOT attempt to
perform this process yourself as engine damage may
result from contaminants envolved in the cleaning
process for the port.
MAINTENANCE AND REPAIR INSTRUCTIONS
18
Single Line Installation
Go To Step 8 for SplitLine™ Installation
6. Take approximately 40 feet (12.2 m) of new trimming
line, loop it into two equal lengths. Insert each end of
the line through one of the two holes in the inner reel
(Fig. 31). Pull the line through the inner reel so that
the loop is as small as possible.
Fig. 33
Fig. 30
Loop
Slotted
Holes
For Use with SplitLine™
or Single Line
For Use with Single
Line ONLY
Fig. 31
Loop
7. Wind the lines in tight even layers, onto the reel
(Fig. 32). Wind the line in the direction indicated on
the inner reel. Place your index finger between the
two lines to stop the lines from overlapping. Do not
overlap the ends of the line. Proceed to step 11.
Fig. 32
Fig. 34
Fig. 35
Spring
Holding Slots
NOTE: Failure to wind the line in the direction indicated
will cause the cutting attachment to operate
incorrectly.
12. Insert the ends of the line into the two holding slots
(Fig. 34).
SplitLine™ Installation
8. Take approximately 20 feet (6.1 m) of new trimming
line. Insert one end of the line through one of the two
holes in the inner reel (Fig. 33). Pull the line through
the inner reel until only about 4 inches is left out.
9. Insert the end of the line into the open hole in the
inner reel and pull the line tight to make the loop as
small as possible (Fig. 33).
10. Before winding, split the line back about 6 inches.
11. Wind the line in tight even layers in the direction
indicated on the inner reel.
5. Check the indexing teeth on the inner reel and outer
spool for wear (Fig. 29). If necessary, remove burrs or
replace the reel and spool.
NOTE: SplitLine™ can only be used with the inner reel
with the slotted holes. Single line can be used on
either type of inner reel. Use Figure 30 to identify
the inner reel you have.
NOTE: Always use the correct line length when installing
trimming line on the unit. The line may not
release properly if the line is too long.
19
MAINTENANCE AND REPAIR INSTRUCTIONS
Fig. 37
Fig. 38
Air Filter
3. Wash the filter in detergent and water (Fig. 38).
Rinse the filter thoroughly. Squeeze out excess
water. Allow it to dry completely.
Cleaning the Air Filter
WARNING: To avoid serious personal injury,
always turn your trimmer off and allow it to cool
before you clean or do any maintenance on it.
Clean and re-oil the air filter every 10 hours of operation.
It is an important item to maintain. Not maintaining the air
filter will VOID the warranty.
1. Remove air filter/muffler cover. See Removing the
Air Filter/Muffler Cover.
2. Turn cover over and look inside to locate the air filter.
Remove the air filter from inside the air filter/muffler
cover (Fig. 37).
Fig. 36
AIR FILTER MAINTENANCE
Removing the Air Filter/Muffler Cover
WARNING: To avoid serious personal injury,
always turn your trimmer off and allow it to cool
before you clean or do any maintenance on it.
1. Remove the four (4) screws securing the air
filter/muffler cover (Fig. 36). Use a flat blade or
T20 Torx bit screwdriver.
2. Push slightly up and then pull the cover from the
engine. Do not force.
EZ-Start™
Lever
Screws
Screws
Inside Muffler Cover
13. Insert the ends of the line through the eyelets in the
outer spool and place inner reel with spring inside the
outer spool (Fig. 35). Push the inner reel and outer
spool together. While holding the inner reel and outer
spool, grasp the ends and pull firmly to release the
line from the holding slots in the reel.
NOTE: The spring must be assembled on the inner reel
before reassembling the cutting attachment.
14. Hold the inner reel in place and install the bump knob
by turning counterclockwise. Tighten securely.
INSTALLING A PREWOUND REEL
1. Hold the outer spool with one hand and unscrew the
bump knob clockwise (Fig. 15, Pg. 11). Inspect the
bolt inside the bump knob to make sure it moves
freely. Replace the bump knob if damaged.
2. Remove the old inner reel from the outer spool
(Fig. 27).
3. Remove the spring from the old inner reel
(Fig. 27).
4. Place the spring in the new inner reel.
NOTE: The spring must be assembled on the inner reel
before reassembling the cutting attachment.
5. Insert the ends of the line through the eyelets in the
outer spool (Fig. 35, Pg. 18).
6. Place the new inner reel inside the outer spool. Push
the inner reel and outer spool together. While holding
the inner reel and outer spool, grasp the ends and
pull firmly to release the line from the holding slots in
the spool.
7. Hold the inner reel in place and install the bump knob
by turning counterclockwise. Tighten securely.
Replacement Parts:
See Accessories / Replacement Parts on page 22.
MAINTENANCE AND REPAIR INSTRUCTIONS
20
6. Replace the air filter inside the air filter/muffler cover
(Fig. 37, Pg. 20).
NOTE: Operating the unit without the air filter and air
filter/muffler cover assembly, will VOID the
warranty.
Reinstalling the Air filter/Muffler Cover
1. Place the air filter/muffler cover over the back of the
carburetor and muffler. Align the screw holes.
2. Insert the four (4) screws into the holes in the air
filter/muffler cover (Fig. 36, Pg. 20) and tighten.
Do not over tighten.
5. Squeeze the filter to spread and remove excess oil
(Fig. 40).
Fig. 40
Fig. 42
SPARK ARRESTOR MAINTENANCE
1. Remove air filter/muffler cover. See Removing the
Air Filter/Muffler Cover.
2. Locate muffler front and the two (2) bolts securing it
to the engine. (Fig. 41). Remove the two (2) bolts
using a flat blade screwdriver or 5/16-inch socket or
nut driver. Pull muffler off of the engine.
3. Turn muffler over to the back side and locate the
exhaust gasket. Remove the muffler gasket from the
muffler (Fig. 41).
NOTE: If exhaust gasket is torn or damaged, replace
with a new gasket before reassembling muffler.
4. Using a small flat blade screwdriver, carefully pry up
the spark arrestor from the recessed hole (Fig. 42).
Remove spark arrestor from muffler.
5. Clean the spark arrestor with a wire brush. Replace if
damaged or unable to clean thoroughly (Fig. 42).
Fig. 41
Muffler - Front Side
Muffler - Back Side
Bolts
Exhaust
Gasket
Spark
Arrestor
Muffler - Back Side
Spark
Arrestor
Flat blade
Screwdriver
Spark Arrestor
6. Reinstall the spark arrestor by pressing it into the
recessed hole on muffler's back side. Make sure it
fits tightly against the muffler and is not raised up.
7. Place exhaust gasket against muffler's back side.
Align exhaust gasket bolt holes with bolt holes in
muffler. While holding exhaust gasket in place, insert
bolts into muffler's front side. (Fig. 41).
8. Place muffler with exhaust gasket in place and bolts
inserted against the engine, aligning bolt holes.
Tighten bolts to secure muffler to the engine.
If using a torque wrench torque to:
80-90 in.•lb. (9-10.2 N•m).
WARNING: If muffler is not tightened
securely, it could fall off causing damage to
the unit and possible serious personal injury.
9. Reinstall air filter/muffler cover.
Fig. 39
4. Apply enough clean SAE 30 oil to lightly coat the
filter (Fig. 39).
MAINTENANCE AND REPAIR INSTRUCTIONS
21
Fig. 43
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the
Air Filter/Muffler cover (Fig. 43).
NOTE: Careless adjustments can seriously damage your
unit. An authorized service dealer should make
carburetor adjustments.
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 Oil and Fuel Information Pg. 12.
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 screw. Refer to Air
Filter Maintenance Pg. 19.
Adjust Idle Speed Screw
WARNING: The cutting attachment may be
spinning during idle speed adjustments.
Wear protective clothing and observe all
safety instructions to prevent serious
personal injury.
If after checking the fuel mixture and cleaning the
air filter the engine still will not idle, adjust the idle speed
screw as follows.
1. Start the engine and let it run at a high idle for 5
minutes to warm up. See Starting/Stopping
Instructions, Pg. 13.
2. Release the throttle trigger and let the engine idle. If
the engine stops, insert a small phillips or flat blade
screwdriver into the hole in the air filter/muffler cover
(Fig. 43). Turn the idle speed screw in, clockwise,
1/8 of a turn at a time (as needed) until the engine
idles smoothly.
NOTE: The cutting attachment should not rotate when
the engine idles.
3. If the cutting attachment rotates 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.
If not and:
• The engine will not idle,
• The engine hesitates or stalls on acceleration,
• There is a loss of engine power,
have the carburetor adjusted by an authorized service
dealer.
WARNING: When the unit is turned off
make sure the cutting attachment has
stopped before the unit is set down to
prevent serious personal injury.
Idle Speed Screw
MAINTENANCE AND REPAIR INSTRUCTIONS
22
REPLACING THE SPARK PLUG
Use a Champion RDJ7Y spark plug (or equivalent). The
correct air gap is 0.020 inch (0.5 mm). Remove the plug
after every 25 hours of operation and check its condition.
1. Stop the engine and allow it to cool. Grasp the plug
wire firmly and pull it from the spark plug.
2. Clean around the spark plug. Remove the spark plug
from the cylinder head by turning a 5/8 in. socket
counterclockwise.
3. Replace cracked, fouled or dirty spark plug. Set the
air gap at 0.020 in. (0.5 mm) using a feeler gauge
(Fig. 44).
CAUTION: Do not sand blast, scrape, or
clean electrodes. Grit in the engine could
damage the cylinder.
4. Install a correctly gapped spark plug in the cylinder
head. Tighten by turning the 5/8 in. socket clockwise
until snug.
If using a torque wrench torque to:
110-120 in.•lb. (12.3-13.5 N•m).
Do not over tighten.
ACCESSORIES/REPLACEMENT PARTS
2-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . 791-147543
Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . 791-610311B
Exhaust Gasket . . . . . . . . . . . . . . . . . . . . . . .791-182065
Spark Arrestor . . . . . . . . . . . . . . . . . . . . . . . .791-182747
Replacement Line . . . . . . . . . . . . . . . 0.105in ( 2.66mm )
Replacement Line Cartridge . . . . . . . . . . . . . . . 753-1160
Inner Reel Spring . . . . . . . . . . . . . . . . . . . . 791-610636B
Outer Spool . . . . . . . . . . . . . . . . . . . . . . . . . 791-683301
Inner Reel . . . . . . . . . . . . . . . . . . . . . . . . . . . 791-147495
Bump Knob . . . . . . . . . . . . . . . . . . . . . . . . 791-180814B
Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . 791-180000B
Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . 791-682075B
These replacement parts can be purchased from your
local authorized dealer.
0.020 in.
(0.5 mm)
Fig. 44
CLEANING AND STORAGE
23
CLEANING
WARNING: To avoid serious personal injury,
always turn your trimmer off and allow it to cool
before you clean or do any maintenance on it.
Use a small brush to clean off 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 housing
or handle. Wipe off any moisture with a soft cloth.
STORAGE
• 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 locked up to prevent unauthorized use or
damage.
• Store the unit in a dry, well ventilated area.
• Store the unit out of the reach of children.
LONG TERM STORAGE
If the unit will be stored for an extended time, use the
following storage procedure.
1. Drain all fuel from the fuel tank and drain into a
container with the same 2-cycle fuel mixture. Do not
use fuel that has been stored for more than 60 days.
Dispose of the old fuel/oil mix in accordance to
Federal, State, and Local regulations.
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 1 oz. (30 ml) 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.
NOTE: Remove the spark plug and drain all of the oil
from the cylinder before attempting to start the
trimmer after storage.
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. The unit is
ready for storage.
5. Thoroughly clean the unit and inspect for any loose
or damaged parts. Repair or replace damaged parts
and tighten loose screws, nuts or bolts. The unit is
ready for storage.
TRANSPORTING
• Allow the engine to cool before transporting.
• Secure the unit while transporting.
• Drain fuel from unit.
• Tighten fuel cap before transporting.
TROUBLESHOOTING
24
CAUSE ACTION
Cutting attachment bound with grass Stop the engine and clean cutting attachment
Cutting attachment out of line Refill with new line
Inner reel bound up Replace the inner reel
Cutting head dirty Clean inner reel and outer spool
Line welded Disassemble, remove the welded section
and rewind the line
Line twisted when refilled Disassemble and rewind the line
Not enough line is exposed Push the bump knob and pull out line until
4 inches (102 mm) of line is outside of the
cutting attachment
CAUSE ACTION
Old or improperly mixed fuel Drain gas tank / Add fresh fuel mixture
Improper carburetor adjustment Take to an authorized service dealer for
carburetor adjustment
Fouled spark plug Replace or clean the spark plug
Plugged spark arrestor Clean or replace spark arrestor Pg. 20
CAUSE ACTION
On/Off Stop Control is in OFF position Turn On/Off Stop Control to ON
Empty fuel tank Fill fuel tank with properly mixed fuel
Primer bulb wasn't pressed enough Press primer bulb fully and slowly 5-7 times
Engine flooded Use starting procedure with EZ-Start Lever™
in the RUN position, Pg. 13
Old or improperly mixed fuel Drain gas tank / Add fresh fuel mixture
Fouled spark plug Replace or clean the spark plug
Plugged spark arrestor Clean or replace spark arrestor
ENGINE WILL NOT START
ENGINE WILL NOT IDLE
ENGINE WILL NOT ACCELERATE
ENGINE LACKS POWER OR STALLS WHEN CUTTING
CAUSE ACTION
Air Filter is Plugged Replace or clean the air filter
Old or improperly mixed fuel Drain gas tank / Add fresh fuel mixture
Improper carburetor adjustment Adjust per instruction Pg. 21
CAUSE ACTION
Old or improperly mixed fuel Drain gas tank / Add fresh fuel mixture
Improper carburetor adjustment Take to an authorized service dealer for
carburetor adjustment
Cutting attachment bound with grass Stop the engine and clean the cutting attachment
Dirty air filter Clean or replace the air filter
Plugged spark arrestor Clean or replace spark arrestor Pg. 20
CUTTING ATTACHMENT WILL NOT ADVANCE LINE
If further assistance is required, contact your authorized service dealer.
SPECIFICATIONS
25
Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25 in. (31.75 mm)
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 cu in. (31 cc)
Clutch Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Centrifugal
Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800 - 3,600 rpm
Operating RPM (Trimmer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,100 -
10,400 rpm
Operating RPM (Brushcutter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,200 -
9,600 rpm
Ignition Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic
Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Momentary Flip Switch
Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.020 in. (0.5 mm)
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel/Oil Mixture
Fuel/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32:1
Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diaphragm, All-Position
Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto Rewind
Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baffled with Guard
Throttle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Spring Return
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 oz. (355 ml)
ENGINE
DRIVE SHAFT and CUTTING ATTACHMENT
Drive Shaft Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube, EZ-Link™
Throttle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger with Lock-Out
Unit Weight (No fuel, with cutting attachment, cutting attachment shield and J-handle) . . . . . . . . . . . 14 lbs. (5.23 kg)
Cutting Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-Tooth Cutting Blade, Dual String Cutting Head
Line Spool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Line Releaser
Line Spool Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 inches (101.6 mm)
Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.105 inch (2.66 mm)
Cutting Path Diameter, Cutting Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 inches (45.7 cm)
Cutting Path Diameter, Cutting Blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 inches (204 mm)
Shoulder Harness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Quick-Snap
26
NOTES
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