5
MAINTENANCE SCHEDULE
Perform these required maintenance procedures at the frequency stated in the table. These
procedures should also be a part of any seasonal tune-up.
NOTE:
Some maintenance procedures may require special tools or skills. If you are unsure about
these procedures, take your unit to a Troy-Bilt or other qualified service dealer.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be
performed by a Troy-Bilt or other qualified service dealer.
NOTE: Please read the California/EPA statement that came with the unit for a complete listing of
terms and coverage for the emissions control devices, such as the spark arrestor, muffler,
carburetor, etc.
CHECKING THE OIL LEVEL
The importance of checking and maintaining the proper oil level in
the crankcase cannot be overemphasized. Check oil before each
use:
1. Stop the engine and allow oil to drain into the crankcase.
2. Place the engine on a level surface.
3. Clean the area around the oil plug before removing it. Keep
dirt, grass clippings, and other debris out of the engine.
4. Remove the oil plug (Fig. 14).
5. Look into the oil fill hole (use a flashlight if needed). The oil
should be just touching the innermost thread (Fig. 13).
6. If the oil level is not touching the innermost thread on the oil fill
hole, add a small amount of oil to the oil fill hole and recheck
(Fig. 13). Repeat this procedure until the oil level reaches the
innermost thread on the oil fill hole.
NOTE: Do not overfill the unit.
NOTE:
Make sure the O-ring is in place on the oil plug when
checking and changing the oil (Fig. 14).
CHANGING THE OIL
Change the oil while the engine is still warm. The oil will flow freely
and carry away more impurities.
1. Remove the oil fill plug.
2. Pour the oil out of the oil fill hole and into a container by
tipping the unit to a vertical position (Fig. 15). Allow ample
time for complete drainage.
3. Wipe up any oil residue on the unit and clean up any oil that
may have spilled. Dispose of the oil according to federal, state
and local regulations.
4. Refill the crankcase with 2.03 fl.oz. (60 ml) of SAE 30 SF, SG,
SH oil (Fig. 17).
NOTE:
Use the bottle and spout saved from initial use to
measure the correct amount of oil. The fill line on the bottle’s
label measures approximately 2.03 fl.oz. (60 ml) (Fig. 16).
5. Check the level. See Checking the Oil Level.
6. Once full, replace the oil plug.
AIR FILTER MAINTENANCE
Cleaning the Air Filter
Failure to maintain the air filter will VOID the warranty.
1. To open the air filter cover, push the tab on the left side of the cover inward and pull the air filter
cover slightly out and to the right (Fig. 18).
2. Remove the air filter (Fig. 18).
3. Wash the filter in detergent and water. Making sure to rinse the
filter thoroughly and allow it to dry.
4. Lightly coat the filter with clean SAE 30 motor oil.
5. Squeeze the filter to spread and remove excess oil.
6. Replace the filter.
NOTE: Operating the unit without the air filter will VOID the
warranty.
7. To reinstall the air filter cover, position the hooks on the right
side of the air filter cover into the slots at the right side of the
back plate (Fig. 18).
8. Swing the cover to the left and press closed so the air filter
cover tab snaps into the slot on the back plate (Fig. 18).
IDLE SPEED ADJUSTMENT
The idle speed of the engine is adjustable. An idle adjustment
screw is between the air filter cover and the engine starter housing
(Fig. 19).
NOTE:
Careless adjustments can seriously damage to the unit. A
qualified service dealer should make carburetor adjustments.
If, after checking the fuel and cleaning the air filter, the engine still
will not idle, adjust the idle speed screw as follows:
1. Start the engine and warm up according to the Starting/
Stopping Instructions.
2. Release the trigger and let the engine idle. If the engine stops,
insert a small Phillips screwdriver in between the air filter cover
and the engine cover (Fig. 19). Turn the idle speed screw 1/8 of a turn clockwise at a time until the
engine idles smoothly.
Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve most engine
problems. If not and all of the following are true:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
take the unit to a qualified service dealer.
ROCKER ARM CLEARANCE
This requires disassembly of the engine. If you feel unsure or
unqualified to perform this, take the unit to a qualified service
dealer.
• The engine must be cold when checking or adjusting the
rocker arm clearance.
• This task should be performed inside, in a clean, dust free
area.
1. Remove the 8 engine cover screws with the appropriate tool
(Fig. 20), then remove the cover.
NOTE:
Make sure to store the screws so that they can be
reinstalled into their original holes.
2. Disconnect the spark plug wire.
3. Clean dirt from around the spark plug and rocker arm cover.
Remove the spark plug from the cylinder by turning a 5/8 in.
socket counterclockwise.
4. Remove the screw holding the rocker arm cover with the
appropriate tool (Fig. 21). Remove the rocker arm cover and
gasket.
5. Turn the flywheel slowly to bring the piston to the top of its
travel (known as top dead center). Check that:
• The piston is at the top of its travel by looking in the spark
plug hole (Fig. 21)
• Both rocker arms move freely, and both valves are closed.
If these statements are not true, repeat this step.
6. Slide the feeler gauge between the rocker arm and the valve
return spring. Measure the clearance between the valve stem
and rocker arm (Fig. 22). Measure both the intake and exhaust
valves.
The recommended clearance for both intake and exhaust is .003
– .006 in. (.076 – 0.152 mm). Use a standard automotive .005 in.
(0.127 mm) feeler gauge. The feeler gauge should slide between
the rocker arm and valve stem with a slight amount of resistance, without binding (Fig. 22.)
7. If the clearance is not within specification:
a.
Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 22).
• To increase clearance, turn the adjusting nut counterclockwise.
• To decrease clearance, turn the adjusting nut clockwise.
b. Recheck both clearances, and adjust as necessary.
8. Reinstalltherockerarmcoverusinganewgasket(Fig.21).Torquethescrewto:20–30in•lb
(2.2–3.4N•m).
9. Check the spark plug and reinstall. See Replacing the Spark Plug.
10. Reinstall the spark plug wire.
11. Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten
screws.
NOTE: Make sure that the screws are reinstalled into their original holes (Fig. 20).
REPLACING THE SPARK PLUG
Use a replacement part number 753-05784 or Champion® spark
plug #RDZ4H. The correct spark gap is 0.025 in. (0.635 mm).
1. Stop the engine and allow it to cool.
2. Open the spark plug cover (Fig. 23).
3. Grasp the plug wire firmly and pull the cap from the spark plug.
4. Clean dirt from around the spark plug. Remove the spark
plug from the cylinder head by turning a 5/8 in. socket
counterclockwise.
5. Replace cracked, fouled or dirty spark plug. Set the spark gap
at 0.025 in. (0.635 mm) using a feeler gauge (Fig. 24).
6. Install a correctly-gapped spark plug in the cylinder head. Turn
the 5/8 in. socket clockwise until snug.
7. Reinstall the spark plug cover.
If using a torque wrench, torque to:
110-120 in.•lb. (12.3-13.5 N•m) Do not over tighten.
Fig. 15
Fig. 23
MAINTENANCE AND REPAIR INSTRUCTIONS
FREQUENCY MAINTENANCE REQUIRED SEE
Every 10 hours Clean and oil air filter p. 5
After 1st 10
hours
Change oil
Check rocker arm to valve clearance and adjust
p. 5
p. 5
Every 40 hours Change oil
Check rocker arm to valve clearance and adjust
Check spark plug condition and gap
p. 5
p. 5
p. 5
Fig. 13
Oil Fill Line
Fig. 16
Fill Level
Fig. 14
O-Ring
Oil Plug
Oil Fill Hole
Fig. 17
WARNING: To avoid serious personal injury,
always turn the unit off and allow it to cool before
cleaning or maintaining it.
Fig. 18
Air Filter Cover
Slot
Air Filter
Tab
WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool
before cleaning or maintaining it.
Fig. 19
Idle Adjustment
Screw
Fig. 22
Rocker Arm
Adjustment Nut
0.003–0.006 in.
(0.076–0.152 mm)
Feeler Gauge
Valve
Stem
Fig. 20
Screws
Screws
Fig. 21
Screw
Rocker
Arm
Cover
Spark
Plug
Hole
Fig. 24
0.025 in.
(0.635 mm)
WARNING: Do not sand blast, scrape or clean
spark plug electrodes. Grit in the engine could
damage the cylinder.
MAINTENANCE AND REPAIR INSTRUCTIONS
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