Carburetor Adjustment - Troy-Bilt TB525CS Manuel De L'utilisateur

NOTE: Use the bottle and spout saved from initial use to measure
the correct amount of oil. The top of the label on the bottle
measures
approximately
3.04 ounces (90
ml) (Fig. 36).
Check the level,
See Checking
the Oil Level. If
the level is low,
add a small
amount of oil and recheck. Do not overfill (Fig. 35).
6. Replace the oil fill plug.
7. Reconnect the spark plug boot.
AIR FILTER MAINTENANCE
WARNING:
To avoid serious personal injury, always
turn the unit off and allow it to cool before you clean or
service it.
Cleaning the Air Filter
Clean and re-oil the air filter every 10 hours of operation. It is an
important item to maintain. Failure to maintain your air filter
properly can result in
poor performance or can
cause permanent
damage to your engine.
1. Open the air filter
cover. Push the tab
on the under side of
the cover inward.
Then pull the air
filter cover out and
up. (Fig. 37).
2. Remove the air filter
(Fig. 41).
3. Wash the filter in
detergent and water
(Fig. 38). Rinse the
filter thoroughly and
allow it to dry.
4. Apply enough clean
SAE 30 motor oil to
lightly coat the filter
(Fig. 39).
5. Squeeze the filter to
spread and remove
excess oil (Fig. 40).
6. Replace the filter
(Fig. 41).
NOTE: If the unit is
operated without
the air filter, you
will VOID the
warranty.
7. Reinstall the air filter
cover. Position the
slots on the top of the
air filter cover onto
the tabs at the top of
the back plate (Fig.
42).
8. Swing the cover down
until the tab on the air
filter backplate snaps
into place in the slot
on the air filter cover
(Fig. 42).

CARBURETOR 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. 43).
MAINTENANCE AND REPAIR INSTRUCTIONS
Fill Level
Fig. 36
Air Filter Cover
Air Filter
Tab
Fig. 37
Fig. 38
Fig. 39
Fig. 40
Back Plate
Air Filter
Locking Tab
Fig. 41
NOTE: Careless
adjustments can
seriously
damage your
unit. An
authorized
service dealer
should make
carburetor adjustments.
Check Fuel
Old fuel is usually the reason for improper unit performance. Drain
and refill the tank with fresh fuel prior to making any adjustments.
Refer to Oil and Fuel Information.
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. 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.
Adjust Idle Speed Screw
WARNING:
sure the cutting attachment has stopped rotating before
you turn it off and set it down.
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 let it run at
a high idle for a minute to
warm up. Refer to
Starting/Stopping Instructions.
2. Release the throttle trigger and
let the engine idle. If the engine
stops, insert a small phillips in
between the Air Filter Cover
and the Engine 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, 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
Have the carburetor adjusted by an authorized service dealer.
WARNING:
idle speed adjustments. Wear protective clothing and
observe all safety instructions to prevent serious personal
Tabs
injury.
ROCKER ARM CLEARANCE
This requires disassembly of the engine. If you feel unsure or unqualified
to perform this, take the unit to an authorized service center.
NOTE: Inspect the valve to rocker arm clearance with a feeler
gauge after the
first 10 hours of
operation and
every 25 hours
of operation.
• The engine must be
cold when checking or
adjusting the valve
clearance.
• This task should be performed inside, in a clean, dust free area.
1. Remove the six (6) screws on the back of the engine cover
Air Filter Cover
Air Filter
Tab
Fig. 42
To prevent serious personal injury, make
Idle Adjustment Screw
Fig. 43
The cutting attachment may spin during
View Of The Rear Engine Cover
Remove
Screws
Fig. 44
Remove
Screws
9