Troy Bilt Trimmer 52066 User Manual
OWNER’S MANUAL  
Trimmer/Mower  
•
•
•
•
•
•
Safety  
Assembly  
Features and Controls  
Operation  
Maintenance  
Parts List  
SAFETY FIRST!  
Before operating this equipment, read this  
Owner's Manual and the separate manual  
supplied by the engine manufacturer.  
Models  
52066  
52070  
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(Recoil Start Model Shown)  
GARDEN WAY INCORPORATED  
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3
Section  
Safety  
1
Trimmer Head  
Control Bail  
SPARK ARRESTER WARNING TO RESIDENTS  
Engine Throttle Control Lever  
OF CALIFORNIA AND SEVERAL OTHER STATES  
Handlebar  
Under California law, and under the laws of several  
other states, you are not permitted to operate an internal  
combustion engine using hydrocarbon fuels on any  
forest, brush, hay, grain, or grass covered land; or land  
covered by any flammable agricultural crop without an  
engine spark arrester in continuous effective working  
order.  
Keyswitch (electric  
start model)  
Engine Recoil  
Starter  
Plastic Debris  
Shield  
Fuel Primer  
The engine on the unit is an internal combustion engine  
which burns gasoline, a hydrocarbon fuel, and must be  
equipped with a spark arrester muffler in continuous  
effective working order. The spark arrester must be  
attached to the engine exhaust system in such a manner  
that flames or heat from the system will not ignite  
flammable material. Failure of the owner/operator of the  
unit to comply with this regulation is a misdemeanor  
under California law (and other states) and may also be  
a violation of other state and/or federal regulations,  
laws, ordinances or codes. Contact your local fire mar-  
shal or forest service for specific information about  
which regulations apply in your area.  
Trimmer  
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Rubber Debris  
Flap  
Trimmer  
Head  
Figure 1-1  
IMPORTANT  
Safe Operation Practices for Walk-Behind Mowers.  
This cutting machine is capable of amputating hands and feet and throwing objects.  
Failure to observe the following safety instructions could result in serious injury or death.  
5. Be sure the area is clear of other  
people (particularly small children and  
pets) before mowing. Stop machine if  
anyone enters the area. Keep bystanders  
at least 50 feet from the area of operation.  
10. Do not operate the trimmer/mower  
without proper guards, plates, or other  
protective safety devices in place.  
General Operation  
1. Read, understand, and follow all  
instructions on the machine and in the  
manuals. Be thoroughly familiar with the  
controls and the proper use of the equip-  
ment before starting.  
11. Refer to provided instructions for  
proper operation and installation of  
accessories. Only use factory-approved  
accessories.  
2. Do not put hands or  
feet near or under rotating  
parts. Keep clear of the  
rotating trimmer head and  
line at all times.  
12. Stop trimmer head when crossing  
gravel drives, walks, or roads. Wait for  
trimmer lines to stop.  
6. Do not operate the machine when  
barefoot or wearing open sandals. Always  
wear substantial footwear.  
13. Stop engine and disconnect  
spark plug wire from spark plug  
whenever you leave the unit,  
clean the unit, or replace  
trimmer line. Remove key  
on electric start model.  
3. Only allow responsible adults, who  
are familiar with the instructions, to oper-  
ate the trimmer/mower. Never let children  
or untrained adults operate this unit.  
7. Wear appropriate clothing such as a  
long-sleeved shirt or jacket and long  
trousers or slacks. Do not wear shorts.  
4. Inspect the area where the machine is  
to be used. The machine can propel small  
objects at high speed, causing personal  
injury or property damage. Clear the area  
of objects such as rocks, toys, wire,  
8. Do not wear loose clothing—it could  
catch in the equipment.  
14. Wait until the trimmer head comes to  
a complete stop, shut the engine off, and  
disconnect the spark plug wire before  
installing or removing trimmer line. Be  
sure the trimmer head is securely attached  
before operating the machine.  
9. Do not mow in reverse unless abso-  
lutely necessary. Always look down and  
behind before and while moving back-  
wards.  
bones, sticks, etc., which could be picked  
up and thrown by the trimmer line.  
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4
Section 1: Safety  
15. Mow only during daylight hours or  
when good artificial light is available.  
monoxide, a deadly gas that is odorless,  
colorless and tasteless. Always run the  
engine outdoors where there is adequate  
ventilation.  
Children  
Tragic accidents can occur if the operator  
is not alert to the presence of children.  
Children are often attracted to the machine  
and the mowing activity. Never assume  
that children will remain where you last  
saw them.  
16. Do not operate the machine while  
under the influence of alcohol or drugs, or  
when tired or ill.  
29. Slow down before turning.  
30. Shut off engine when not trimming or  
mowing.  
17. Never operate this machine in wet  
grass. Be sure of your footing; keep a firm  
hold on the handlebar and walk; never run. 31. Use extra care when loading or  
1. Keep children out of the mowing area  
and under the watchful care of a responsi-  
ble adult.  
unloading machine into a trailer or truck.  
18. Release the Trimmer Head Control  
Bail before starting the engine.  
32. Use this equipment for its intended  
purpose only.  
19. If the unit starts to vibrate abnormally,  
stop the engine and disconnect the spark  
plug wire. Check immediately for the  
cause. Vibration is generally a warning of  
trouble.  
2. Be alert and turn machine off if children  
enter the area.  
33. Always make sure the handlebars are  
tight and comfortably positioned. They  
should never be in an awkward position  
for the operator.  
3. Before and while moving backwards,  
look behind and down for small children.  
4. Never allow children to operate the  
20. Always wear approved safety goggles  
or safety glasses with side shields when  
operating machine. The use of any pow-  
ered machine can result in foreign objects  
being thrown by high speed rotating parts  
which can cause personal injury or prop-  
erty damage. Stay away from glass and  
other easily thrown or breakable objects.  
machine.  
Slope Operation  
5. Use extra care near blind corners,  
shrubs, trees or other objects that may  
obscure vision.  
Slopes are a major factor related to loss of  
control and tip-over accidents which can  
result in severe injury or death. All slopes  
require extra caution. If you can not back  
up the slope or you feel uneasy on a slope,  
do not mow it.  
6. Never carry children, even with the  
trimmer head stopped. Children may fall  
off and be seriously injured or interfere  
with safe machine operation.  
21. Wear work gloves and sturdy footwear  
when using this machine. Leather work  
shoes or short boots are ideal—they pro-  
tect ankles and shins from rocks, pebbles,  
splinters, etc.  
DO:  
7. Do not allow children nearby if you are  
working.  
Mow across the face of slopes; never up  
and down. Exercise extreme caution  
when changing direction on slopes.  
Avoid slopes greater than 15o.  
Service  
22. It is advisable to wear protective  
headgear to prevent the possibility of  
being hit by small flying particles, etc.  
1. Use extra care in handling gasoline and  
other fuels. They are flammable and their  
vapors are explosive. To help prevent a  
fire or explosion:  
Remove objects such as rocks, tree  
limbs, etc.  
23. Before each use, inspect the Throttle  
Control Lever and its cable. Make sure the  
cable is free and that the lever functions  
properly.  
Uneven terrain could overturn the  
machine. Watch for holes, ruts, or  
bumps. Tall grass can hide obstacles.  
a) Use only an approved container.  
b) Never remove gas cap or add fuel  
when engine is running. Let engine  
cool before refueling. Do not smoke.  
Use slow speed.  
24. Watch for traffic when near or when  
crossing roadways.  
Use extra care with grass catchers or  
other attachments. These can change  
the stability of the machine. Keep all  
movement on the slopes slow and grad-  
ual.  
c) Never refuel the machine indoors.  
Fill the fuel tank outdoors and with  
extreme care.  
25. Never attempt to carry children or  
other passengers on the machine. They  
could fall off and be seriously injured, or  
they could interfere with safe operation of  
the machine.  
d) Never store the machine or fuel  
container inside where there is an  
open flame, such as a water heater,  
etc.  
Avoid starting or stopping on a slope.  
26. The machine is equipped with a plas-  
tic debris shield in front of the engine and  
a rubber debris flap under the frame. They  
must be in place and working properly.  
Never remove or cause the debris shield  
or debris flap to cease working. If either  
of these parts is missing or not working  
properly, do not use the machine until this  
situation is corrected.  
e) Replace caps on fuel tank and fuel  
container and clean up spilled fuel  
before starting engine. Move  
machine away from any gasoline  
fumes before starting engine.  
DO NOT:  
f) Keep matches, smoking materials,  
open flames, and sparks away from  
the fuel tank and fuel container.  
Do not mow near drop-offs, ditches, or  
embankments. You could lose your  
footing or balance.  
27. Be aware of where the machine is dis-  
charging materials and do not point the  
discharge at anyone.  
g) Leave 1/2" air space at top of fuel  
Do not mow on very steep slopes.  
tank to allow for fuel expansion.  
2. Never run the engine inside a closed  
area.  
Do not mow on wet grass. Slippery  
footing can be hazardous.  
28. Never run the engine in an enclosed  
area. Engine exhaust contains carbon  
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Section 1: Safety  
5
3. Never clean, or make adjustments or  
repairs with the engine running. Discon-  
nect the spark plug wire and keep the wire other lengths, diameters or material as  
10. Only use eighteen-inch long, .130" or  
.155" diameter trimmer line. Never use  
17. To guard against engine overheating,  
always keep the engine debris guard  
mounted and clean.  
away from the plug to prevent accidental  
starting. Remove ignition key on electric  
start models.  
trimmer line.  
18. For units with electric start:  
11. Trimmer line moves at high speed and  
can cut. Always stop the  
engine and let all moving  
parts stop before replacing  
the trimmer lines. Let the  
engine cool.  
a) Batteries produce explosive gases.  
Keep sparks, flame, cigarettes, etc.,  
away. Ventilate the area when  
4. Keep all nuts and bolts tight, espe-  
cially the trimmer head attachment bolts,  
and keep equipment in good condition.  
Check mounting hardware on trimmer  
head every time you change trimmer line  
and prior to each use.  
charging the battery. Do not charge  
the battery in an airtight space.  
b) Do not use a battery charger other  
12. Do not change the engine governor  
setting or overspeed the engine. The gov-  
ernor controls the maximum safe operat-  
ing speed and protects the engine and all  
moving parts from damage caused by  
overspeed. Authorized service shall be  
sought if a problem exists.  
than the one provided with the unit.  
c) The battery contains toxic materi-  
als. Do not damage the battery  
case. If the case is broken or dam-  
aged, avoid contact with the battery  
contents.  
5. Never tamper with safety devices.  
Check their proper operation regularly.  
6. To reduce fire hazard, keep machine  
free of grass, leaves or other debris build-  
up. Clean up oil or fuel spills. Let  
machine cool before storing.  
d) Properly dispose of a damaged or  
worn battery. Check with local  
authorities for proper disposal.  
13. Do not touch engine parts which may  
be hot from operation. Allow parts to cool  
completely before inspecting, cleaning or  
repairing the unit.  
7. After striking an object, stop the  
engine and disconnect the spark plug wire.  
Inspect the machine and repair, if neces-  
sary, before restarting.  
e) Do not short circuit the battery.  
14. Maintain or replace safety and instruc-  
tional decals. Refer to the Parts List for  
replacement decal information.  
Severe burns and fire can result.  
8. Never make adjustments or repairs  
while engine is running.  
15. Use only original-equipment replace-  
ment parts. Parts manufactured by others  
could present safety hazards and affect  
performance even though they may fit on  
this machine.  
9. Components subject to wear, damage  
and deterioration could expose moving  
parts or allow objects to be thrown. Fre-  
quently check components and replace  
with factory recommended parts, when  
necessary. Regularly inspect the trimmer  
head and debris shield. Make sure they  
are not bent, damaged or loose.  
16. Remember—the end of the season is  
a good time to inspect equipment prior to  
storage.  
Safety Decals  
Make certain that all safety decals on this equipment are kept clean  
and in good condition. The decals are shown (at reduced sizes)  
below. If you need a replacement decal, please refer to the “Parts  
List” in this manual.  
WARNING  
THROWN OBJECT HAZARD  
Objects will be thrown violently by the  
•
cutting head, resulting in significant hazard!  
Keep children, pets and bystanders 50 feet  
•
away from machine while operating.  
Be alert to hidden obstacles.  
•
READ OWNERS MANUAL  
If you need a replacement manual, write to the  
address listed on the serial number decal on  
this unit.  
On right side, rear of  
mower deck  
ROTATING CUTTING HEAD  
Do not service or adjust cutting head or other  
moving parts unless engine is stopped and  
spark plug wire is disconnected.  
1918115 (12/99)  
STOP  
On right  
handlebar  
On left  
handlebar  
On top of mower deck  
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6
Section  
Assembly  
2
STEP 2: INSTALL HANDLEBAR  
ASSEMBLY STEPS  
WARNING  
1. Remove the plastic tie and tape that  
secure the control bail (G, Figure 2-2) to  
the handlebar (A).  
To prevent personal injury or property  
damage, do not start the engine until all  
assembly steps are complete and you  
have read and understand the safety and  
operating instructions in this Manual.  
STEP 1: UNPACKING UNIT  
1. Remove any protective packaging (plas-  
tic film and cardboard) from the handlebar  
and the unit.  
NOTE: Do not pinch or kink the cable that  
is attached to the handlebar.  
2. Carefully remove the handlebar (do not  
pinch or kink the attached cable) before  
removing the unit from the carton.  
2. Carefully lift the handlebars (A, Figure  
2-2) to the rear of the unit and align the  
handlebar legs with the handlebar support  
bracket (B).  
INTRODUCTION  
Carefully follow these assembly steps to  
correctly prepare your machine for use. It  
is recommended that you read this Sec-  
tion in its entirety before beginning  
assembly.  
3. Check that you have received the fol-  
lowing items:  
3. Route the trimmer head control cable  
(C, Figure 2-2) to the outside of the  
handlebar.  
• Trimmer/Mower Assembly (A, Figure  
2-1)  
• Extra Trimmer Line (B, Figure 2-1): six  
each of heavy-duty gauge .130" dia. line  
and extra heavy-duty gauge .155" dia.  
line.  
• The following are packaged separately:  
(3) Plastic Cable Tie  
4. Select the low or high height setting  
holes in the handlebar legs and attach the  
legs to the support bracket (B) using two  
5/16-18 x 1-1/2 hex hd. screws (D) and  
5/16-18 locknuts (E).  
NOTE: If an assembly step applies only to  
certain models, those models are noted at  
the beginning of that step. Otherwise, a  
step applies to all models.  
(1) Hex Hd. Screw, 1/4-20 x 2  
(1) Hex Locknut, 1/4-20  
(2) Hex Hd. Screw, 5/16-18 x 1-1/2  
(2) Hex Locknut, 5/16-18  
IMPORTANT: Adjust the handlebars as  
close as possible to waist level so that  
your arms are at a comfortable height.  
This position will result in less pressure on  
the mower wear cup (located at bottom of  
trimmer head), making the unit easier to  
roll and reducing wear to the wear cup.  
INSPECTION AFTER DELIVERY  
Inspect your machine immediately upon  
delivery. Be sure that neither the carton  
nor the contents have been damaged.  
(2) Ignition Key*  
If you find or suspect any damage, contact  
the carrier (trucking company) right away.  
Inform them of the specific damage and  
that you wish to file a claim. To protect  
your rights, be sure to put this in writing  
to the carrier within 15 days after your  
machine arrives. Please let us know if you  
need assistance with this matter.  
(1) Battery Recharger*  
* Electric Start Model only  
5. Use two cable ties (F, Figure 2-2) to  
secure the trimmer head control cable (C)  
to the handlebar at the locations shown.  
A
STEP 3: ATTACH THROTTLE CONTROL  
LEVER TO HANDLEBAR  
IMPORTANT: The engine is shipped with-  
out motor oil in its crankcase. Motor oil  
must be added before starting the engine.  
1. The throttle control cable (H, Figure 2-  
3) is attached to the engine. Gently unwind  
the cable and position the Throttle Control  
Lever (I) on the outside of the right handle-  
bar, next to the throttle control decal.  
NOTE: LEFT and RIGHT sides of the unit  
are as viewed from the operator’s position  
behind the handlebars.  
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2. Attach the lever with a 1/4-20 x 2 hex  
hd. screw (J, Figure 2-3) and 1/4-20 hex  
locknut (K).  
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7
)
n
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te  
to  
p
d
.
p
e
d
Tools/Supplies Needed:  
• (1) Utility Knife or Scissors  
• (2) 1/2" (or adjustable) Wrenches  
3. Use a cable tie (L, Figure 2-3) to secure  
the cable to the handlebar, as shown.  
• (2) 7/16" Wrenches (one with a  
boxed end)  
STEP 4: ADD MOTOR OIL  
B
1. The engine is shipped without motor  
oil which MUST BE ADDED before the  
engine is started.  
• Motor Oil (see engine manual for oil  
specifications and amount needed)  
Figure 2-1  
2. See the separate engine manual for fill-  
ing instructions and for oil specifications.  
The engine must be level when checking  
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Section 2: Assembly  
7
the oil level. In ambient temperatures  
above 400 F, use a high-quality, SAE #30  
weight detergent oil classified for Service  
SF, SG or SH. Use no special additives.  
Do not mix oil with fuel.  
A
G
STEP 5: CHECK TRIMMER  
HEAD HARDWARE  
Check that the two bolts (M, Figure 2-4)  
on the trimmer head are tightened  
securely. You can rotate the trimmer  
head, as needed.  
F
C
IMPORTANT: The trimmer head hardware  
is permanently installed and is not remov-  
able. Do not attempt to replace the hard-  
ware.  
B
D
E
NOTE: The hole in the top, front end of  
the mower deck is an access point that  
allows the trimmer head assembly to be  
serviced.  
F
T
je  
H
•
R
O
O
b
W
N
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c
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ts  
a
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B
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E
A
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a
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in  
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K
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e
to  
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l
k
H
e
s
,
IN  
G
p
a
A
This completes the Assembly Steps  
for non-electric start units. If you  
have an electric start unit, please  
continue to the next page.  
e
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in  
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il  
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to  
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id  
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IN  
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190  
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4403  
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1/9  
te  
to  
p
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7)  
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d
Figure 2-2: Handlebar installation.  
I
J
M
K
H
M
Figure 2-4: Check trimmer head hardware for tightness.  
L
Figure 2-3: Attach throttle lever to right-side handlebar.  
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8
Section 2: Assembly  
STEP 6: CONNECT AND CHARGE  
BATTERY (Electric Start Model)  
O
The battery (N, Figure 2-5) is located  
behind the debris shield (O). Lift and tilt  
the debris shield forward to access the  
battery.  
N
DANGER  
• Wet conditions can cause an electric  
shock hazard during battery charging.  
Avoid wet conditions when charging  
battery.  
T
je  
H
•
R
O
a
O
b
W
s
c
ts  
m
N
a
O
ro  
W
A
th  
ll  
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u
•
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B
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J
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E
a
tt  
is  
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N
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in  
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fe  
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rd  
il  
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il  
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to  
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b
s
IN  
G
p
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,
A
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th  
in  
ZA  
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D
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ro  
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b
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b
B
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le  
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le  
fr  
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io  
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R
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le  
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O
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id  
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if  
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IN  
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ta  
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ic  
G
b
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s
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a
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in  
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ta  
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ts  
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le  
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ts  
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IN  
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tin  
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ir  
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le  
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tt  
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in  
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EA  
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e
is  
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in  
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o
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1904  
403  
n
is  
r
e
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s
(1/  
te  
to  
p
p
97)  
d
.
e
d
Figure 2-5: Lift and tilt debris shield forward  
to locate battery.  
• Charging the battery with improper  
equipment could cause a battery explo-  
sion. Use only the battery charger sup-  
plied with the unit. The engine must be  
shut off and the spark plug wire discon-  
nected before charging the battery.  
Failure to comply could result in per-  
sonal injury or property damage.  
1. Firmly connect terminal (P, Figure 2-6)  
on end of wires leading from battery to  
receptacle (R) on end of wires leading  
from wiring harness.  
R
P
2. Connect the terminal (S, Figure 2-7) on  
the supplied battery charger to the  
recharging line receptacle (T) on the  
wiring harness (located behind key  
switch).  
Figure 2-6  
U
3. Plug the charger box (U) into a  
grounded, 120V wall outlet. Initially  
charge the battery for 24 hours before  
using the electric starter. After charging,  
unplug the charger box (U) from the wall  
outlet and then disconnect the terminal  
(S) from the receptacle (T).  
T
S
Figure 2-7  
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9
Section  
Features and Controls  
3
WARNING  
Operating Symbols  
Various symbols (shown  
SLOW  
STOP  
Before operating your machine, care-  
fully read and understand all safety,  
controls and operating instructions in  
this Manual, the separate Engine  
Owner’s Manual, and on the decals on  
the machine.  
ENGAGE  
BAIL  
DISEN-  
GAGE  
BAIL  
here, with word descrip-  
tions) are used on the  
unit.  
ENGINE  
STOP  
TRIMMER  
HEAD  
STOP  
FAST  
Engine Recoil Starter  
The recoil starter (G, Figure 3-1) is used to  
pull start the engine.  
Failure to follow these instructions can  
result in serious personal injury.  
Fuel Primer Button  
E
INTRODUCTION  
The fuel primer button (H, Figure 3-1)  
allows a cold engine to be primed for  
faster, easier starting.  
This Section describes the location and  
function of the features and controls on  
your machine. Refer to Section 4: “Opera-  
tion” for detailed operating instructions.  
T
•
H
R
O
al  
O
W
bj  
sm  
ec  
ts  
N
•
th  
e
l
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ng  
su  
ch  
O
B
J
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W
A
ha  
cu  
ris  
as  
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za  
tti  
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ro  
th  
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rd  
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ee  
to  
he  
ill  
s,  
H
A
Z
p
ey  
ad  
pe  
IN  
G
et  
ch  
es  
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es  
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A
B
ild  
re  
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D
R
O
t
t
o
ts  
po  
in  
en  
fic  
Keyswitch (electric start model)  
The ignition keyswitch (I, Figure 3-1) acti-  
vates the engine starter motor to start the  
engine. The keyswitch does not have an  
engine stop position. Use the Engine  
Throttle Control (F) to stop the engine.  
IMPORTANT: Always remove ignition key  
when leaving unit unattended.  
o
n
T
h
m
a
se  
s
tl  
ot  
ot  
A
id  
ac  
nd  
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IN  
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di  
cu  
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ire  
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tti  
is  
1904403 (1/97)  
ss  
ng  
H
E
or  
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A
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ed  
.
pe  
d
IMPORTANT: Refer to the separate engine  
manual for detailed information about the  
controls on the engine.  
Figure 3-1A: Debris shield in operating  
position.  
FEATURES AND CONTROLS  
Trimmer Head Control Bail  
Battery (electric start model)  
The battery (J, Figure 3-1) activates the  
engine starter motor when the keyswitch  
is turned to the start position.  
Pull the control bail (A, Figure 3-1) up  
against the handlebar (engage bail) to  
start rotation of the trimmer head. Let go  
of the control bail (disengage bail) to stop  
the trimmer head.  
Cutting Height Settings  
The trimmer head (B, Figure 3-1) is  
adjustable to an infinite number of height  
settings from 1-1/2" to 4-1/2" (see “Adjust  
Line Cutting Height” in Section 4).  
F
A
Trimming Line Mounting Plates  
The two trimming lines (C, Figure 3-1) are  
secured to wire-looped line holders.  
Replacing the trimmer lines is easy (see  
“Changing Trimmer Lines” in Section 5).  
I
G
D
Handlebar Height Adjustment  
The handlebar (D, Figure 3-1) has two  
height settings (see “Adjust Handlebars”  
in Section 4).  
E
H
Plastic Debris Shield  
T
H
•
R
O
O
b
W
je  
s
c
N
a
m
ts  
a
s
O
ro  
WARNING  
•
th  
e
ll  
d
u
ch  
B
e
J
s
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E
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rd  
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to  
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il  
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ro  
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in  
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B
aw  
to  
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in  
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b
le  
R
D
e
ay  
re  
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lt  
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fr  
,
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ex  
p
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R
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rt  
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le  
if  
D
O
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ts  
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id  
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ig  
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IN  
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A heavy-duty plastic shield (E, Figures 3-1  
and 3-1A) prevents debris build-up on the  
engine. The shield tilts forward for access  
to the engine.  
s
p
v
in  
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o
C
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ta  
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1
9
0
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4
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97)  
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C
J
B
Engine Throttle Control Lever  
Use this lever (F, Figure 3-1) to change  
engine speeds and to stop the engine.  
The throttle settings are shown on a decal  
next to the lever.  
C
Figure 3-1: Features and controls (electric start model shown).  
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10  
Section  
Operation  
4
FILL FUEL TANK  
WARNING  
CAUTION  
Before adjusting the cutting height, shut  
off the engine, wait for all moving parts  
to stop, allow the engine to cool, discon-  
nect the spark plug wire and prevent it  
from touching the spark plug.  
Before operating your machine, carefully  
read and understand all safety, controls  
and operating instructions in this  
Manual, in the separate Engine Owner’s  
Manual, and on the decals on the  
machine.  
DANGER  
GASOLINE IS HIGHLY FLAMMABLE AND  
ITS VAPORS ARE EXPLOSIVE.  
Follow gasoline safety rules in this  
Manual (see Section 1) and in the  
separate Engine Owner’s Manual.  
Failure to comply could result in per-  
sonal injury or property damage.  
Failure to follow these instructions can  
result in serious personal injury.  
Failure to follow gasoline safety rules  
and instructions can result in serious  
personal injury and property damage.  
To adjust the cutting height:  
INTRODUCTION  
1. The cutting line height can be changed  
when the wear cup is in contact with the  
ground. If necessary, you may tip the unit  
back slightly for a better view (do not tip  
unit all the way back or motor oil may flow  
to the exhaust area and the engine may  
smoke for several seconds when started).  
Read this Section thoroughly before start-  
ing the engine. As with any piece of out-  
door power equipment, getting the “feel”  
for how the machine operates and know-  
ing the best techniques for particular jobs  
are important to overall good performance.  
1. Lift and tilt plastic debris shield (E,  
Figure 3-1) forward.  
2. Clean fuel fill area and engine (see  
“Cleaning Debris” in engine manual) each  
time before fuel is added.  
3. Fill the fuel tank with gasoline accord-  
ing to the directions in the engine manual.  
Follow all instructions and safety rules  
carefully.  
2. Use a 1/2" wrench to loosen the two  
bolts (not the nuts) located on opposite  
sides of the trimmer head (A, Figure 4-1).  
NOTE: References to LEFT, RIGHT, FRONT  
and REAR of the unit are determined by  
standing in the operator’s position.  
3. The cutting heights are marked on the  
side of the spindle head (Figure 4-2).  
Move the top of the trimmer head to the  
desired setting.  
4. Securely replace the fuel tank cap and  
the fuel container cap. Promptly wipe up  
any fuel spills.  
PRE-START CHECKLIST  
1. Review Section 1: “Safety” and Section  
3: “Features and Controls”.  
5. Lift and tilt the debris shield back, then  
push it down to secure it.  
4. Tighten both trimmer head bolts  
securely (to 75 in/lbs.) and evenly.  
2. Check for loose or missing hardware.  
Tighten or replace as needed.  
3. Check that the engine oil level is up to  
the “FULL” mark on the dipstick. (See  
engine manual for instructions.)  
ADJUST HANDLEBAR HEIGHT  
A
CAUTION  
4. Check the fuel level. (See engine  
manual and this page for instructions.)  
Before adjusting handlebar height, stop  
engine and wait for all moving parts to  
stop, disconnect spark plug wire and  
prevent it from touching spark plug.  
NOTE: Clean debris from around fuel cap,  
oil dipstick and engine (see “Cleaning  
Debris” in engine manual) before checking  
oil level or adding gasoline.  
A
Failure to comply could result in  
personal injury or property damage.  
Figure 4-1  
5. Check the Trimmer Head Control Bail  
and the Engine Throttle Control Lever for  
freedom of movement.  
To adjust handlebar height, refer to “Install  
Handlebars” in Section 2.  
6. Select the cutting height (see “Adjust  
Line Cutting Height” in this Section).  
Height  
Guide  
ADJUST LINE CUTTING HEIGHT  
7. Check handlebar height position.  
The cutting height of the trimmer line can  
be adjusted between 1-1/2" to 4-1/2". We  
recommend that you start at a higher set-  
ting and make adjustments as needed.  
8. Carefully check the area to be trimmed  
and remove any debris.  
9. Install the correct diameter trimmer  
line (see “Use the Correct Diameter Trim-  
mer Line” in this Section).  
In general, use higher settings to handle  
taller material and to cope with tougher  
cutting conditions. Use any trimming  
height for less demanding conditions.  
Figure 4-2  
10. On electric start models, check the  
wire harness connections.  
11. Attach the spark plug wire to the  
spark plug.  
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Section 4: Operation 11  
TO START THE TRIMMER HEAD  
USE THE CORRECT  
DIAMETER TRIMMER LINE  
1. Stand in the operator’s position  
directly behind the handlebars.  
Before starting a project, look at the grass  
or material you will be cutting.  
2. Slowly close the Trimmer Head Control  
Bail (Figure 4-3) against the handlebars to  
activate the trimmer head. Use the Engine  
Throttle Control Lever to adjust the speed  
of the trimmer head.  
For tougher conditions, use two (or four)  
sections of the thicker gauge, .155" diame-  
ter extra-heavy duty line. For less  
demanding conditions, use two sections  
of the thinner gauge, .130" diameter  
heavy-duty line. The thicker line has the  
heft to chop through tougher materials,  
while the thinner line provides a more pre-  
cise cut. To change trimmer lines, refer to  
“Changing Trimmer Lines” in Section 5.  
A
3. Once the trimmer head is revolving,  
push the unit along the path to be cut.  
Figure 4-3: Control bail.  
OPERATING THE MACHINE  
Once you have read and understood the  
sections in this Manual on “Safety,”  
“Assembly,” “Features and Controls,” and  
“Operation,” you are ready to operate  
your machine.  
TO STOP THE TRIMMER HEAD  
Let go of the Trimmer Head Control Bail.  
The bail will return to its open position and  
the trimmer head will stop turning.  
NOTE: The thinner line is also recom-  
mended for use near trees or ornamentals  
to help prevent girdling (cutting the bark).  
TO STOP THE ENGINE  
Put the Engine Throttle Control Lever in  
the STOP position. (If time allows, first  
move the throttle lever to the SLOW set-  
ting before stopping the engine.)  
CHECKLIST BEFORE STARTING  
USING THE TRIMMER  
HEAD CONTROL BAIL  
Before starting the engine, know how to  
use the Trimmer Head Control Bail.  
1. Complete the “Pre-Start Checklist” in  
this Section. You must wear safety  
glasses or goggles.  
2. Check the trimmer line cutting height  
(see “Adjust Line Cutting Height” in this  
Section.  
1. The Trimmer Head Control Bail (A,  
Figure 4-3) is used to start and stop trim-  
mer head rotation.  
NOTE: If the unit is operated in a  
stationary position with the wear  
cup in contact with dry vegetation,  
significant heat will result that may  
deform the plastic spindle or scorch  
the vegetation.  
2. When starting the engine, always have  
the control bail in the disengaged (released)  
position to prevent the trimmer head from  
turning when the engine starts.  
STARTING THE ENGINE  
1. Move the unit to the work area.  
2. Connect spark plug wire to spark plug.  
3. Put on safety-approved eye protection.  
3. When the engine is running, pull the  
control bail up against the handlebar to  
start rotation of the trimmer head.  
4. Release (disengage) the Trimmer Head  
Control Bail (A, Figure 4-3).  
WARNING  
THROWN OBJECT HAZARD!  
4. Let go of the control bail to stop the  
trimmer head. The control bail should  
spring forward to the disengaged position.  
If it doesn’t, do not use the machine until  
the control bail has been repaired.  
5. Put Engine Throttle Control Lever in  
FAST (rabbit symbol) position.  
• Objects such as rocks, pebbles, and  
small debris will be thrown violently  
by the cutting head, resulting in  
significant hazard to eyes and  
exposed body parts.  
6. Push in fuel primer button as instructed  
in Engine Owner’s Manual. NOTE: Do not  
use primer to restart a warm engine after a  
short shutdown.  
• Always wear safety-approved eye  
protection and suitable clothing and  
footwear.  
WARNING  
7. Recoil Starting:  
If the trimmer head control bail is not  
operating properly, shut off the  
engine, disconnect the spark plug wire  
and move the wire away from the plug.  
Pull recoil start rope slowly until resis-  
tance is felt. Then pull rope out rapidly  
to start engine. Let rope back in  
slowly. NOTE: If engine fails to start  
after three pulls, repeat step 6  
• Keep children, pets and bystanders  
50 feet away from machine while  
operating.  
Adjust or repair the control bail  
before using the trimmer/mower.  
• Be alert to hidden obstacles.  
Electric Starting:  
Failure to comply could result in  
injury or property damage.  
Failure to follow this instruction could  
result in personal injury or property  
damage.  
Stand behind handlebars and turn igni-  
tion key clockwise to crank engine. If  
engine does not start after five (5) sec-  
onds of cranking, release key and  
repeat step 6. When engine starts,  
release key.  
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12  
Section 4: Operation  
OPERATING TIPS & TECHNIQUES  
Tips for Precision Cutting  
Use Extreme Caution on Slopes  
For the most precise cutting possible, be sure to select the  
appropriate line cutting height and trimmer line size (thickness)  
for the conditions at hand.  
When operating on sloping ground, use extreme caution and  
common sense to avoid possible injury or property damage.  
Do not mow on excessively steep slopes! Avoid slopes if  
greater than 150 or wherever footing is unsure. If a slope is  
difficult to stand on, it is probably too steep to trim or mow.  
In this case, it may be wiser to establish a permanent ground  
cover on this area.  
When mowing, let the cutting head rest lightly on the ground,  
without lifting up or pushing down on the handlebars. This tech-  
nique allows the cutting head to follow the ground contour  
closely, resulting in the most even cut possible.  
Also, be sure to ease into heavy growth to prevent overwhelming  
the machine.  
Do not trim on slopes when the ground is slippery. Trim  
across the face of a slope, not up and down. Slow down and  
exercise caution when changing direction on slopes.  
Grass and most other materials are most efficiently trimmed when dry. But the unit will do a fine  
job even with damp or wet materials. When conditions are moist or damp, be sure to clean  
debris off the machine regularly to keep cutting efficiency high. And watch your footing!  
Trim When Wet or Dry  
Clean the Unit On  
a Regular Basis  
Do Not Let the Trimmer Lines  
Become Too Short  
Keep the Mowed Side On the  
Right While Moving Forward  
The trimmer/mower discharges cut  
materials to the right side.  
Clean under the mower deck frequently  
to remove any debris buildup. Also  
clean around the muffler and on top of  
engine.  
When the trimmer lines wear to less  
than 1/2 their original length, trimming  
jobs will take far longer than necessary.  
As a general guideline, install new lines  
when they wear to 1/2 their original  
length.  
For best results, stay on the right side of  
unmowed growth as you move along.  
See the cleaning instructions in Section  
5: “Maintenance.”  
Vary the Throttle Setting  
According to Conditions  
Use the Correct  
Walking Speed  
The majority of trimming and mowing jobs will yield the best results if the  
throttle control is set at the fastest speed.  
Use a travel speed that is suitable for the condi-  
tions at hand.  
Less demanding jobs (and projects that require very precise cutting) will yield  
better results if the engine speed is somewhat reduced. For example, damage  
to trees and ornamentals can be avoided by reducing the engine speed, using  
the lighter .130" diameter line, and by keeping a safe distance away.  
For example, you’ll get better trimming and  
mowing results at slower walking speeds if the  
grass is tall or lush.  
Shorter grass or less dense growth can be cut  
at faster travel speeds.  
Again, once you begin a particular job and get a “feel” for the conditions, you  
will be able to make adjustments for the best possible results.  
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13  
Section  
Maintenance  
5
ADJUSTING TRIMMER  
REMOVING AND REPLACING  
WARNING  
HEAD ENGAGEMENT  
The tension on the drive belt must be cor- 1. Stop the engine and wait for all moving  
THE TRIMMER HEAD  
Before inspecting, cleaning or  
servicing the machine, shut off engine,  
wait for all moving parts to come to a  
complete stop, disconnect spark plug  
wire and move wire away from spark  
plug. Remove ignition key on electric  
start models.  
rect for proper operation of the trimmer  
head. If the tension is correct, the trim-  
mer head will rotate when the Trimmer  
Head Control Bail is pulled back against  
the handlebar (another indication of cor-  
rect tension is if the engine stalls when  
the trimmer head becomes bound up in  
very tough material).  
parts to stop. Disconnect the spark plug  
wire and move it away from the spark  
plug. Remove the ignition key on electric  
start models.  
2. Two bolts (A, Figure 5-2) secure the  
trimmer head (B) to the spindle head (C).  
Loosen both bolts (not the nuts) just  
enough to allow the trimmer head to slide  
down the spindle head and past the two  
stops. Do not attempt to remove the bolts  
– they are permanently attached. NOTE: It  
may be necessary to remove the wear cup  
(D, Figure 5-2) when replacing the trim-  
mer head. See Step 4 for instructions.  
Failure to follow these instructions can  
result in serious personal injury or prop-  
erty damage.  
A worn or loose drive belt will cause the  
trimmer head to move slowly – or not at  
all – when the control bail is engaged (belt  
squealing may also be noticeable).  
MAINTENANCE SCHEDULE  
PROCEDURE  
NOTES  
2, 3  
2, 6  
2
If the tension is too tight, the trimmer  
head may rotate before the control bail is  
engaged, or when there is no free play in  
the control bail.  
Check motor oil level  
Check trimmer/mower lines  
Check trimmer head engagement  
Engine/machine cleaning  
Check nuts and bolts  
Change motor oil  
3. Install the new trimmer head on the  
spindle head. Tighten the hardware  
securely (to 75 in/lbs.) and evenly.  
2, 7, 8  
2
To Adjust Belt Tension  
4. Inspect the wear cup (D, Figure 5-2)  
for signs of severe wear, such as deep  
gouges. Use the following steps if the  
wear cup needs to be replaced:  
1, 11  
4, 11  
4
1. Stop the engine and wait for all parts  
to stop moving. Adjust the two jam nuts  
on the control cable adjustment stud (see  
Figure 5-1) as follows:  
Service air filter system  
Clean under deck  
General lubrication  
4
a. Insert a Phillips head screwdriver  
into the small hole at the top, front of  
the deck (see Figure 5-5) and rotate the  
trimmer head until the screwdriver  
engages a hole in the trimmer head.  
This will prevent the trimmer head from  
turning when you next remove the hex  
nut (E, Figure 5-2).  
Inspect drive belt  
5
a. To tighten belt tension, thread the  
upper nut (A, Figure 5-1) upward one or  
two full turns, followed by the lower nut  
(B). Tighten both nuts securely. Test  
unit and readjust jam nuts as needed.  
Clean engine  
2, 10  
3, 9  
Check trimmer head wear cup  
NOTES  
1 - After first 2 hours of break-in operation; every  
25 hours thereafter.  
b. To loosen belt tension, thread the  
lower nut (B) downward one or two full  
turns, followed by the upper nut (A).  
Tighten both nuts securely. Test unit  
and readjust jam nuts as needed.  
2 - Before each use.  
3 - Every 5 operating hours.  
4 - Every 25 operating hours.  
5 - Every 100 operating hours.  
b. Remove hex nut (E), washer (F) and  
wear cup (D). Install the new wear cup  
and reinstall the washer and hex nut.  
Tighten securely and remove Phillips  
screwdriver from deck.  
6 - New line replacement is suggested when old  
line is 50% or less of original length.  
7 - Clean daily in extremely dusty or dirty  
conditions.  
A
8 - See Engine Owner’s Manual for service  
C
B
recommendations.  
9 - Replace when severe gouges exist on bottom  
surface  
10 - At each fuel refill.  
11 - Service more often if used in extremely dusty  
or dirty conditions (see Engine Owner’s  
Manual).  
B
A
D
NOTE: LEFT and RIGHT sides of unit are  
as viewed from operator’s position behind  
the handlebars.  
F
Figure 5-1  
E
Figure 5-2  
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14  
Section 5: Maintenance  
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to  
come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove  
ignition key on electric start models.  
WARNING  
Failure to follow these instructions can result in serious personal injury or property damage.  
5. With a 1/2" wrench, remove the screw  
INSPECTING AND REPLACING  
THE DRIVE BELT  
D
(D, Fig. 5-3) from the front belt cover-  
spindle mounting plate. Then remove the  
other four screws securing the belt cover-  
spindle mounting plate (E, F, G and H, Fig.  
5-3). Carefully lower the drive housing  
and the belt cover-spindle mounting plate.  
Note precisely how the belt is routed along  
the pulleys. (See Figure 5-6.) Slip the belt  
off the rear pulley (H, Figure 5-6), then off  
the other pulleys. NOTE: The nut on the  
idler arm V-pulley must be removed in  
order to take off the belt (the screw may  
need to be held with an Allen wrench).  
Install the new belt along the exact same  
path.  
The drive belt can be inspected or  
replaced from beneath the machine deck.  
Note that the belt should not require  
inspection for many hours of operation.  
E
F
G
Belt Inspection  
Stop the engine and let all moving parts  
stop. Disconnect the spark plug wire and  
move it away from the spark plug. Re-  
move the ignition key on electric start  
models.  
H
B
C
1. For convenience, we recommend that  
you place the unit on a raised platform for  
easier access to the underside of the deck.  
6. Clean parts of all debris. Replace the  
lower drive shaft housing and front belt  
cover-spindle mounting plate, the spindle  
head, the wear cup, the rear belt cover,  
and the debris flap.  
2. Remove the rubber debris flap (A,  
Figure 5-3) by removing one of the small  
E-rings (B) at the ends of the retainer rod  
and then sliding the retainer rod out.  
A
Figure 5-3  
7. Check for correct belt tension. See  
“Adjusting Trimmer Head Engagement” in  
this Section.  
3. Remove the rear belt cover by using a  
1/2" wrench to remove the screw (C,  
Figure 5-3) in the rear belt cover. Examine  
the belt. Feed it around the rear (engine)  
pulley so the entire belt can be examined.  
If cracks or other damage are noted, a  
new belt is needed. Otherwise, clean and  
reinstall the belt cover and debris flap.  
THROWN OBJECT  
Objects such as rocks, peb  
small  
the  
H
d
cu  
ebris will  
hazard to eyes an  
ttin  
Keep  
c
g
head, resulting in signific  
be throw  
fe  
e
t
a
w
hildre  
ay from  
Be alert  
t
Belt Replacement  
m
ble  
orsn violen  
50  
n, pets  
a
d
ndex  
b
p
y
o
s
s
ta  
e
n
d
d
b
e
B
notROTATING CUTTING HEAD  
idden ob  
cthacinle  
other moving parts unless engine is stop  
and spark  
o
h
Do  
service  
o
a
s
e
s.  
w
p
dy parts  
hile operating  
r
adj  
ust  
lu  
c
g
wire  
utting head or  
.
is discon  
nected.  
19  
044  
03  
(1  
/97)  
ped  
DANGER  
4. Remove the spindle head by taking off  
the hex nut (A, Figure 5-4) at the bottom  
of the spindle, using a 3/4" socket wrench.  
(While loosening the nut, prevent the spin-  
dle head from turning by inserting a  
screwdriver or rod into hole B, Figure 5-5,  
at the top-front of the deck. Be sure to  
align one of four holes in the pulley with  
the deck hole first.)  
KEEP HANDS and FEET AWAY  
A
Figure 5-4  
Figure 5-5  
H
Figure 5-6  
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Section 5: Maintenance  
15  
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to  
come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove  
ignition key on electric start models.  
WARNING  
Failure to follow these instructions can result in serious personal injury or property damage.  
BELT PERFORMANCE  
TROUBLESHOOTING  
CLEANING THE ENGINE  
Spindle Mounting Plate  
Front Pulley  
Before each use of the machine and at  
each refueling, clean grass, chaff or accu-  
mulated debris from the finger guard area  
(A, Figure 5-10) on top of the engine, and  
from the linkage, springs and controls on  
the engine. Keep the area around and  
behind the muffler free of any combustible  
debris. See “Cleaning Debris” in the  
Engine Owner’s Manual for complete  
cleaning instructions. Do not use water to  
clean engine parts as water could contam-  
inate the fuel system. Use a brush or dry  
cloth. Be sure engine is cool before clean-  
ing around muffler area.  
Poor belt performance (noise, overheating,  
cracking, etc.), can be caused by several  
conditions. Follow the steps below to cor-  
rect belt performance problems. Also use  
these checks after installing a new belt.  
After shutting the engine off and discon-  
necting the spark plug wire, remove the  
rear belt cover on the underside of the  
machine (refer to previous page). Release  
the Trimmer Head Control Bail to remove  
all belt tension.  
Belt Guide  
Brake  
Place  
Tape Here  
Figure 5-7  
Rear  
Pulley  
Belt  
1 – Belt must be routed between pulleys  
and guides.  
Guide  
NOTE: The separate engine air cleaner  
must also be serviced according to the  
instructions in the Engine Owner’s  
Manual.  
Examine inside surface of belt. If it is  
cracked or peeling, unbolt and lower the  
spindle mounting plate and proceed with  
this step. The pulley system has two belt  
guides (see Figures 5-7 and 5-8) – the belt  
must run between the pulleys and the  
guides. If it doesn’t, reroute it as shown.  
Use masking tape to temporarily hold the  
belt in place while reattaching the spindle  
mounting plate.  
Minimum  
1/4" Gap  
Figure 5-8  
WARNING  
Engine parts must be kept clean to  
reduce the risk of overheating and igni-  
tion of accumulated debris. This espe-  
cially important if cutting tall grass.  
Clean accumulated debris at each refuel-  
ing and before each use of the machine.  
Idler Arm  
Idler Pulley  
Idler Pulley  
2 – Minimum clearance is 1/4" on each  
side between rear belt guide and pulley.  
If the rear belt guide (Figure 5-8) is less  
than 1/4" from the sides of the pulley when  
the Trimmer Head Control Bail is engaged,  
loosen the belt guide hardware and move the  
guide to create a clearance of at least 1/4".  
Tighten the hardware securely.  
Failure to comply can cause injury or  
property damage.  
Longer Hub  
Figure 5-9  
LUBRICATION  
Apply light oil or a silicone-based lubricant  
to the following locations:  
A
3– Both idler pulleys must be mounted  
right-side up.  
Check that the two idler pulleys shown in  
Figure 5-9 are correctly installed – note that  
the longer hub on each pulley is against the  
idler arm. If the pulleys are upside-down,  
turn them over and tighten them securely.  
• Throttle control cable  
• Control bail cable  
• Nuts, bolts and other hardware  
NOTE: The spindle head is permanently  
lubricated at the factory. There is no need  
for additional lubrication.  
Figure 5-10  
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16  
Section 5: Maintenance  
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to  
come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove  
ignition key on electric start models.  
WARNING  
Failure to follow these instructions can result in serious personal injury or property damage.  
cause poor performance and damage to  
TRIMMER/MOWER CLEANING  
AND DEBRIS REMOVAL  
WARNING  
the engine. Never operate the engine with-  
out the air cleaner installed. Inspect and  
service the air cleaner after every 25 oper-  
ating hours, more often if operating in  
very dusty or dirty conditions. Refer to  
the Engine Owner’s Manual for cleaning or  
replacement instructions.  
• Never perform maintenance when  
engine is running or spark plug wire is  
connected, except when instructed to  
do so.  
Regular cleaning of debris from around the  
engine and on the machine is required for  
maximum engine efficiency and good over-  
all performance. Inspect and clean the fol-  
lowing areas regularly, making sure the  
engine is stopped – and cool – before pro-  
ceeding:  
• Never store mower with fuel in fuel  
tank inside a building where fumes can  
reach an open flame or spark, or where  
ignition sources are present such as  
hot water and space heaters, furnaces,  
clothes dryers, stoves, electric motors,  
etc. Make sure engine is cool before  
storing.  
Spark Plug – Inspect and clean or replace  
the spark plug after every 100 operating  
hours or annually. Refer to the Engine  
Owner’s Manual for cleaning or replace-  
ment instructions.  
• Brush and wipe off all engine surfaces,  
especially before checking oil or adding  
fuel. Do not let oil or grease accumu-  
late. For access to the front of the  
engine, the debris shield can be lifted up  
and tilted forward.  
Spark Arrester Screen – If the engine is  
equipped with a spark arrester screen,  
remove and clean it according to the time  
intervals and instructions in the Engine  
Owner’s Manual.  
• Drain gasoline outdoors into an  
approved container.Do not smoke and  
keep fuel away from open flame.  
• Wipe the deck clean, particularly near  
the engine muffler.  
Failure to follow these instructions will  
result in serious personal injury or prop-  
erty damage.  
• Clean the underside of the deck.  
Engine Cleaning – The engine must be  
kept clean to assure smooth operation and  
to prevent damage from overheating.  
Refer to the Engine Owner’s Manual for  
specific cleaning instructions.  
• Keep safety and operating decals clean  
and legible.  
• Keep all control levers clean so they  
work properly.  
• Store machine on a level surface.  
• Thoroughly inspect the machine for any  
loose, broken or missing parts. Repair  
or replace parts as necessary.  
Carburetor/Governor Control  
COMPACT STORAGE  
Adjustments – The carburetor was  
adjusted at the factory for best operating  
speed. Refer to the Engine Owner’s Manual  
for any adjustment information.  
For compact storage, remove the two  
screws and locknuts securing the handle-  
bar and carefully (to avoid kinking the  
cables) rotate the handlebar so that the  
upper portion rests on the engine and the  
handlebar legs face to the rear of the unit.  
• Protect the engine and perform the rec-  
ommended engine maintenance by fol-  
lowing the engine storage instructions  
found in the Engine Owner’s Manual. Be  
sure to protect the fuel lines, carburetor  
and fuel tank from gum deposits by  
removing fuel or by treating fuel with a  
fuel stabilizer (follow the engine manu-  
facturer’s recommendations).  
The governor controls the maximum safe  
operating speed and protects the engine  
and other moving parts from damage  
caused by overspeeding. Do not tamper  
with the governor settings. Seek autho-  
rized service if you think an adjustment is  
required.  
GENERAL ENGINE MAINTENANCE  
Perform the following engine maintenance  
for your engine according to the engine  
maintenance schedule and instructions in  
the separate Engine Owner’s Manual:  
• Clean any dirt, grass or chaff from the air  
cooling system intake area and other  
parts of the engine.  
Throttle Control Adjustment – If the  
engine does not shut off when the throttle  
lever is moved to the stop position, or if  
the engine does not respond to various  
throttle settings, refer to the Engine  
Owner’s Manual for service information.  
Engine Oil Service – Check the engine oil  
level before starting the engine and after  
each 5 hours of continuous operation.  
Running the engine when it is low on oil  
will quickly ruin the engine.  
• For the electric start model, remove the  
key from the keyswitch and store it in a  
safe place. Charge the battery for 24  
hours both before and after storage.  
• Disconnect spark plug wire from spark  
plug. Prevent wire from touching spark  
plug by placing wire away from spark  
plug.  
Change the oil after every 25 hours of  
operation and more often when operating  
in extremely dirty or dusty conditions.  
OFF-SEASON STORAGE  
When storing the machine for extended  
periods, follow these procedures to  
ensure that the unit will be in good condi-  
tion for future use.  
Air Cleaner Service – The air cleaner fil-  
ters dirt and dust out of the air before it  
enters the carburetor. Operating the  
engine with a dirty, clogged air filter can  
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Section 5: Maintenance  
17  
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to  
come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove  
ignition key on electric start models.  
WARNING  
Failure to follow these instructions can result in serious personal injury or property damage.  
amount of line should project out from  
CHANGING TRIMMER LINES  
WARNING  
each side of the line holder, creating an  
overall 22" wide cutting swath. The two  
lines can be offset to increase the cutting  
swatch up to 25" wide. DO NOT offset the  
lines so that the overall cutting swath is  
greater than 25". See Warning statement  
at right.  
The trimmer lines will wear with use and  
eventually require replacement. Also, you  
may wish to switch between the thinner  
and thicker gauge lines to handle differ-  
ent mowing conditions.  
Offsetting the trimmer lines causes the  
lines to rotate faster than when they  
project an equal length on each side.  
This increases the chance of loose  
materials being dislodged and pro-  
pelled at high speeds.  
Replace the trimmer lines when they  
wear to the point that trimming and  
mowing projects take too long and  
requires too much maneuvering of the  
machine. A good rule of thumb is to  
change the lines when they reach half of  
their original length.  
Failure of the operator to wear safety  
goggles and appropriate clothing and to  
keep bystanders away can result in  
severe personal injury or property  
damage.  
IMPORTANT: Whether replacing one or  
both lines, they must both be .130" or  
.155" in diameter.  
5. Repeat steps 2 through 4 to replace  
the second trimmer line.  
Use the extra-heavy duty gauge (.155"  
diameter) line when cutting thick, tough  
growth. The thinner gauge (.130" diame-  
ter) line is for use in less demanding con-  
ditions, and is also recommended for use  
near trees or ornamental plantings to  
help prevent girdling (cutting of bark).  
Figure 5-11: Use this  
single line, easy-loop pat-  
tern for all but the more  
difficult cutting conditions.  
To Change Trimmer Lines:  
1. Stop engine, allow all moving parts to  
stop and then disconnect the spark plug  
wire and move it away from the spark  
plug. Remove the ignition key on electric  
start models. DO NOT tip the machine.  
DO NOT touch the metal wear cup on the  
bottom of the spindle head. This surface  
may be hot.  
Reverse Loop  
Figure 5-12: If lines tend to  
loosen (especially in more  
difficult cutting conditions),  
add a single reverse loop  
and then readjust line so  
that ends are even. This  
pattern results in a slightly  
narrower cutting swath.  
NOTE: The two line holders on the trim-  
mer head are permanently secured by a  
screw and nut. Do not attempt to remove  
the line holders as it is not necessary to  
remove them in order to change the trim-  
mer lines.  
2. The trimmer lines can be changed  
when the trimmer head is in contact with  
the ground. If necessary, you may tip the  
unit back slightly for a better view. How-  
ever, do not tip the unit all the way back  
or motor oil may flow to the exhaust area  
and the engine may smoke for several  
seconds when started.  
Figure 5-13: For more diffi-  
cult cutting conditions, use  
two of the thicker (.155"  
diameter) lines in each line  
holder. Follow the pattern  
shown in Figure 5-11.  
3. Three different line installation pat-  
terns are available, as shown in Figures  
5-11, 5-12 and 5-13.  
4. Simply fee the line through the loops  
of the line holder as shown. An equal  
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18  
Section 5: Maintenance  
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to  
come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove  
ignition key on electric start models.  
WARNING  
Failure to follow these instructions can result in serious personal injury or property damage.  
BATTERY REPLACEMENT  
BATTERY SERVICE  
If the battery no longer takes a charge, or if  
it is damaged, it must be replaced.  
BATTERY RECHARGING  
1. Tilt the debris shield forward.  
DANGER  
2. First disconnect the negative (–) black  
wire from the battery terminal. Next dis-  
connect the positive (+) red wire from the  
battery terminal. NOTE: The plastic recep-  
tacles (E and F, Figure 5-15) do not need  
to be disconnected.  
• Wet conditions can cause an electric  
shock hazard during battery charging.  
Avoid wet conditions when charging  
battery.  
• Charging the battery with improper  
equipment could cause a battery explo-  
sion. Use only the battery charger sup-  
plied with the unit. The engine must be  
shut off and the spark plug wire discon-  
nected before charging the battery.  
3. Remove the front screw (D, Figure 5-  
15) from the battery clamp and remove  
the battery. Discard the battery according  
to battery disposal regulations in your  
area.  
Failure to comply could result in  
personal injury or property damage.  
4. Place the new battery under the clamp  
as shown in Figure 5-15. Replace the  
clamp screw (D).  
The battery should be recharged before  
storing the unit for more than three (3)  
weeks. It should also be recharged after  
bringing it out of storage.  
5. First connect the positive (+) red wire  
to the positive (+) red-marked battery ter-  
minal. Next connect the negative (–) black  
wire to the negative (–) black-marked bat-  
tery terminal.  
The engine must be stopped and the area in  
which recharging will take place must be  
dry.  
6. Close the debris shield.  
1. Connect the terminal (A, Figure 5-14)  
on the supplied battery charger to the  
recharging line receptacle (B) on the  
keyswitch wiring harness.  
2. Plug the charger box (C, Figure 5-14)  
into a grounded, 120V wall outlet. Charge  
the battery for 24 hours. After charging,  
unplug the charger box (C) from the wall  
outlet and the disconnect the terminal (A)  
from the receptacle (B).  
(+)  
F
D
(–)  
E
Figure 5-15  
C
B
A
Figure 5-14  
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Section 5: Maintenance  
19  
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to  
come to a complete stop, disconnect spark plug wire and move wire away from spark plug. Remove  
ignition key on electric start models.  
WARNING  
Failure to follow these instructions can result in serious personal injury or property damage.  
TROUBLESHOOTING  
Before performing any of the corrections in this Troubleshooting Chart, refer to the appropriate information contained in this  
Manual or the Engine Owner’s Manual for the correct safety precautions and servicing procedures. Contact your local autho-  
rized Engine Service Dealer for engine service. Contact your local authorized dealer for service problems with the machine.  
PROBLEM  
POSSIBLE CAUSE  
CORRECTION  
Engine does not start.  
1. Spark plug wire disconnected.  
2. Defective or incorrectly gapped spark plug.  
3. Fuel tank empty.  
1. Connect wire.  
2. Inspect/replace spark plug.  
3. Add fuel.  
4. Dirty carburetor or fuel line.  
5. Dirty air cleaner.  
6. Carburetor out of adjustment.  
7. Engine flooded.  
8. Engine Throttle Lever in incorrect position.  
9. Stale gasoline.  
10. Defective Engine Throttle Lever.  
11. Dirt or water in fuel tank.  
4. See engine service dealer.  
5. Clean or replace.  
6. See engine service dealer.  
7. Wait several minutes before starting.  
8. Move Throttle Lever to FAST position.  
9. Drain old fuel and add fresh fuel.  
10. See engine service dealer.  
11. See engine service dealer.  
Engine runs poorly.  
1. Bad spark plug.  
2. Dirty air filter.  
1. Inspect/replace spark plug.  
2. Clean or replace.  
3. Carburetor out of adjustment.  
4. Stale fuel.  
5. Dirt or water in fuel tank.  
6. Engine cooling system clogged.  
3. See engine service dealer.  
4. Drain and replace fuel mixture.  
5. See engine service dealer.  
6. Clean fins.  
Engine overheats.  
1. Engine cooling system clogged.  
2. Carburetor out of adjustment.  
1. Clean air cooling areas and behind debris shield.  
2. See engine service dealer.  
Engine does not shut off.  
1. Throttle control misadjusted.  
1. See engine service dealer.  
.
Poor mowing performance.  
1. Line length is too short or too long.  
1. Adjust line length to 18" long. When less  
than 1/2 this length, replace the line.  
2. Adjust cutting height to approximately 1/3  
of the length of the grass.  
2. Cutting height is too high or low for height  
of grass being cut.  
3. Engine not set at FAST speed.  
3. Move Engine Throttle Lever to FAST (Rabbit).  
Trimmer/Mower vibrates.  
1. Trimming head mounting nut loose.  
2. Line lengths are substantially different.  
3. Loose nuts or bolts.  
1. Tighten nut.  
2. Adjust lines to approximately equal lengths.  
3. Check all bolts and nuts, including engine  
bolts.  
4. Broken spindle head or trimmer head.  
1. Incorrect line installation.  
4. Replace broken part.  
Trimmer head does not  
retain line.  
1. See Changing Trimmer Lines in Section 5.  
Trimmer Head does not  
retain height setting.  
1. Head bolts may be loose.  
2. Head is worn.  
3. Foam inserts worn.  
1. Tighten head bolts to 75 in/lbs.  
2. Replace head assembly.  
3. Replace foam inserts  
Electric Starter (if equipped)  
does not start engine.  
1. Battery wires disconnected.  
2. Battery discharged.  
3. Broken wire in keyswitch wiring harness.  
4. Defective engine starter motor.  
1. Reconnect wires.  
2. Charge battery.  
3. Replace wiring harness.  
4. See engine service dealer.  
Battery (if equipped) does not  
recharge during engine  
operation.  
1. Defective engine recharging system.  
2. Dead battery.  
1. See engine service dealer.  
2. Replace battery.  
Battery charger (if equipped)  
does not recharge battery.  
1. Dead battery.  
2. Battery wire(s) broken.  
3. Defective battery charger.  
1. Replace battery.  
2. Replace wires.  
3. Replace battery charger.  
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20 Parts List  
Models 52066/52070  
DRAWING NO. 1  
35  
7
8
33  
34  
22  
16  
18  
26  
37  
13  
17  
14  
12  
39  
26  
2
37  
18  
15  
24  
3
37  
40  
23  
32  
1
37  
23  
27  
24  
28  
41  
23  
40  
22  
41  
30  
25  
28  
31  
29  
25  
31  
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Parts List 21  
Models 52066/52070  
PARTS LIST – DRAWING NO. 1  
Ref. # Part #  
Description  
Qty.  
Ref. # Part #  
Description  
Qty.  
1
2
3
7
1904421  
1904511  
1918115  
1918082  
1918118  
*
Deck (Incl. Refs. 2 and 3)......................... 1  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
37  
39  
40  
41  
1909301  
1763187  
1910865  
Hex Hd. Flange Screw, 1/4-20 x 5/8 ......... 4  
Hex Hd. Flange Screw, 1/4-20 x 1............. 2  
Belt Guide................................................. 1  
Decal-Hot Surface..................................... 1  
Decal-Warning/Thrown Objects................ 1  
Decal-Logo (A) ......................................... 1  
Decal-Logo (B) ......................................... 1  
Engine - Recoil Start (A)........................... 1  
Engine - Electric Start (B) ......................... 1  
Key, 3/16" x 1" Sq. .................................... 1  
Pulley, 4" OD............................................. 1  
Battery (B) ................................................ 1  
Pad - Battery (B)....................................... 1  
1915219001 Flap Bracket.............................................. 2  
1917154  
1915212  
1185304  
1915205  
1918415  
1915967  
1917765  
1915320  
9677  
Deflector Flap............................................ 1  
Deflector Flap Rod.................................... 1  
E-Ring, 5/16" ............................................ 2  
Belt Cover................................................. 1  
Push-In Fastener ...................................... 5  
Debris Guard Support............................... 1  
Debris Guard ........................................... 1  
Spacer ...................................................... 4  
Set Screw ................................................. 1  
Washer ..................................................... 2  
Clip ........................................................... 2  
8
12  
13  
14  
15  
16  
17  
18  
22  
23  
24  
9301  
1915240  
1909647  
1915268  
.
1915204001 Bracket - Battery (B)................................. 1  
1909697  
1910835  
90063  
1768194  
1754128  
Battery Wire Connector (B)....................... 1  
Keyswitch Wire Harness (B)..................... 1  
Hex Hd. Flange Screw, 5/16-18 x 1**....... 3  
Hex Hd. Flange Screw, 3/8-16 x 1-1/2...... 3  
Hex Hd. Flange Screw, 1/4-20 x 3/4 ......... 2  
94018  
9218  
(A) Model 52066  
(B) Model 52070  
* Order parts from your local authorized engine dealer. Refer to engine for model/type number.  
**Model 52066 uses one screw; Model 52070 uses two screws.  
N/I Not included with unit, order separately  
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22 Parts List  
Models 52066/52070  
DRAWING NO. 2  
1
4
3
7
9
2
6
11  
8
7
10  
5
13  
12  
14  
19  
14  
19  
24  
25  
23  
21  
22  
20  
17  
14  
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Parts List 23  
Models 52066/52070  
PARTS LIST – DRAWING NO. 2  
Ref. # Part #  
Description  
Qty.  
Ref. # Part #  
Description  
Qty.  
1
2
3
4
5
6
7
8
9
1915963  
1915889  
1100807  
1917175  
Upper Handlebar (Incl. Refs. 2 & 8).......  
Decal-Bail Operation...............................  
Hex Hd. Screw, 1/4-20 x 2 .....................  
Trimmer Head Control Bail.....................  
1
1
1
1
1
1
2
1
1
1
1
1
13  
14  
17  
1185814  
1763682  
Hex Flange Lock Nut, 1/4-20..................  
Cable Tie.................................................  
1
3
1
1
2
2
1
1
1
1
1910809001 Lower Handlebar (A) ..............................  
1904508  
1100799  
1732499  
1904406  
1900455  
1187950  
92018  
Lower Handlebar (B) ..............................  
Hex Hd. Screw, 5/16-18 x 1-1/2, Gr. 5 ...  
Lock Nut, 5/16-18 ..................................  
Decal - Keyswitch (B).............................  
Keyswitch (B).........................................  
Lockwasher, 5/8 (B)...............................  
Hex Nut, 5/8-32 (B)................................  
Key (B)  
1749977001 Cable Bracket .........................................  
19  
20  
21  
22  
23  
24  
25  
1918081  
1908677  
1918304  
1908679  
1910852  
1110106  
1983658  
Throttle Control & Cable.........................  
Nyliner Bushing......................................  
Decal-Throttle Settings...........................  
Push Cap, .312 I.D. ................................  
Trimmer Head Control Cable..................  
Hex Lock Nut, 1/4-20 .............................  
Hex Hd. Screw, 1/4-20 x 1-1/8...............  
10  
11  
12  
96520  
(A) Model 52066  
(B) Model 52070  
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24 Parts List  
Models 52066/52070  
DRAWING NO. 3  
14  
16  
15  
8
14  
9
17  
12  
13  
7
25  
11  
10  
18  
6
22  
20  
22  
5
19  
4
22  
22  
1
21  
23  
2
24  
3
Ref. # Part #  
Description  
Qty.  
Ref. # Part #  
Description  
Qty.  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
1910850001 Spindle Mounting Plate ..........................  
1
1
1
1
1
1
1
1
1
1
1
1
1
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
1186393  
1910855  
1915261  
1910854  
1910857  
1910852  
1910849  
1910858  
1909304  
90063  
Hex Flange Nut, 3/8-16...........................  
2
1
1
1
1
1
1
1
4
5
1769048  
1915477  
Spindle Assembly...................................  
Spindle Shaft Assembly (Incl. Ref. 25)...  
Flat Idler Pulley.......................................  
Washer, .88 x .382 x .275 ......................  
Idler Arm Spacer ....................................  
Button Head Screw, 3/8-16 x 1-1/2.......  
Control Cable (also Ref. 13, Pg. 4)........  
Idler Tension Spring...............................  
Hex Flange Screw, 3/8 x 16 x 2-1/4........  
Hex Flange Screw, 5/16-18 x 3/4............  
Hex Flange Screw, 5/16-18 x 1...............  
Hardened Shim, 3/4 ID x 1.022 OD  
1910860001 Belt Guide...............................................  
1910856  
1910842  
1904308  
1915555  
1904479  
1910859  
1910847  
1983039  
1727978  
Spindle Spacer .......................................  
Spindle Pulley.........................................  
Hex Flange Nut, 1/2-13...........................  
V-Belt .....................................................  
Idler Arm/Brake Shoe Assembly.............  
Socket Hd Capscrew, 10-24 x 3/4 ..........  
Brake Shoe.............................................  
Hex Lock Nut, 10-24 ..............................  
V-Groove Idler Pulley .............................  
9953  
x .060 thick..........................................  
Belleville Washer, 5/8.............................  
1
1
25  
9928  
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Parts List 25  
Models 52066/52070  
DRAWING NO. 4  
14  
17  
1
13  
17  
2
15  
3
14  
13  
5
13  
7
15  
5
2
13  
3
Ref. # Part #  
Description  
Qty.  
Ref. # Part #  
Description  
Qty.  
1
2
3
5
13  
1917778  
1915823  
1915824  
1733398  
1744708  
Wheel - 6 spoke .....................................  
Wheel Stud.............................................  
Wheel Mounting Bracket ........................  
Top Lock Nut, 3/8-16 .............................  
Hex Lock Nut, 5/16-18 ...........................  
2
2
2
2
8
14  
15  
17  
1111606  
1186331  
9901  
Hex Head Bolt, 5/16-18 x 2 ....................  
Hex Flange Screw, 5/16-18 x 1...............  
Washer, 5/16 ID .....................................  
2
4
2
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26 Parts List  
Models 52066/52070  
DRAWING NO. 5  
Qty.  
1
Ref. # Part #  
Description  
1
2
3
4
1910863  
1910861  
1918879  
--  
Shoulder Washer....................................  
Spindle Head..........................................  
Trimmer Head ........................................  
Trimmer String (see Refs.  
1
1
1
2
1 and 2 below) ..................................... --  
5
6
7
8
9
1910862  
Hex Spline Washer.................................  
1
1
1
1
4
1915220001 Wear Cup ...............................................  
9
1915239  
1904308  
1918332  
Washer...................................................  
Hex Flange Nut, 1/2-13...........................  
Rubber Shim Kit (2 shims). Affixed to  
two inner walls of trimmer head..........  
3
4
1
5
6
7
8
ACCESSORIES AND KITS  
3
1
2
Ref. # Part #  
Description  
Qty.  
1
2
3
1904476  
1904477  
1768449  
Trimmer String Kit, .155" (includes  
24 pieces)............................................ N/I  
Trimmer String Kit, .130" (includes  
24 pieces)............................................ N/I  
Battery Charger (for electric start model)  
1
N/I Not included with unit, order separately  
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NOTES  
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CUSTOMER SERVICE INFORMATION  
Owner Registration Card  
Customer Service and Technical Service  
Please fill out and mail the enclosed owner  
registration card. The purpose of this card is  
to register each unit at the factory so that we  
can provide you with warranty benefits and  
informational bulletins.  
If you have questions or problems with the  
unit, contact your local dealer or the factory.  
(When calling or writing, provide the  
Model/Serial Numbers of the unit.)  
MAIL  
MAIL  
Replacement Parts  
Warranty Service  
Factory specified replacement parts are  
available from your authorized dealer or  
directly from the factory. When ordering  
parts, be sure to provide the following:  
The warranty statement is included in the unit’s literature  
package.  
Model/Serial Numbers  
• Model/Serial Numbers of the unit.  
• Part number of the part needed.  
• Part Description.  
A Model/Serial Numbers decal is located on the side of the  
deck. For ready reference, record these numbers in the  
spaces below.  
Date of Purchase:  
Model Number:  
Serial Number:  
• Quantity needed.  
NOTE: All replacement parts must conform to our rigid quality  
specifications. Although some replacement parts we provide  
may vary slightly in shape, color or texture from the original  
parts, any variations will not affect the fit or performance of  
these parts on your unit.  
Authorized Dealer Information  
If you purchased your unit from an authorized dealer, record  
the dealer’s address and phone number below for ready refer-  
ence:  
Engine Service and Repair  
For engine service or repair, contact your  
nearest authorized engine dealer (look in the  
Yellow Pages under “Engines–Gasoline”).  
The engine is warranted by the engine man-  
ufacturer. Any unauthorized work performed  
on the engine during the warranty period  
may void this warranty. For complete  
details on the engine warranty, refer to the engine owner  
manual.  
Dealer Name:  
Address:  
Phone:  
IMPORTANT:  
Left and right sides of the unit are determined by standing  
behind the unit, in the operator’s position, and facing in the  
direction of forward travel.  
WARNING  
NOTICE:  
We urge using only genuine replacement parts, which  
meet all the latest requirements. Replacement parts  
manufactured by others could present safety hazards,  
even though they may fit on the unit.  
We reserve the right to change specifications, add  
improvements or discontinue the manufacture of any of our  
equipment without notice or obligation to purchasers of our  
equipment.  
For customer assistance, contact your nearest authorized dealer or:  
GARDEN WAY INCORPORATED • 1 Garden Way • Troy, New York 12180  
Customer Service: 1-800-437-8686 • Technical Service: 1-800-520-5520 • Parts Service: 1-800-648-6776  
• FAX: (518) 233-4622 • WEB SITE: www.troybilt.com  
Outside the United States and Canada:  
Customer Service: (518) 233-4807 • Technical Service: (518) 233-4808 • Parts Service: (518) 233-4806 • FAX (518) 233-4622  
1905692 (5/01)  
Printed in U.S.A.  
© 2001 Garden Way Incorporated  
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