Carburetor Adjustment - Troy-Bilt TB144 Manual Del Operador

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 left side of the cover
in, swing the air filter cover out and off the air filter housing (Fig. 19).
2. Remove the air filter and the screen that sits behind it (Fig. 19).
Air Filter Choke Lever
Screw
Hooks
Air Filter
Air Filter
Housing
3. Wash the filter in detergent and water (Fig. 20). Rinse the
filter thoroughly and allow it to dry.
4. Apply enough clean SAE 30 motor oil to lightly coat the filter
(Fig. 21).
5. Squeeze the filter to spread and remove excess oil (Fig. 21).
6. Replace the filter (Fig. 19).
NOTE: If the unit is operated without the air filter, you will
VOID the warranty.
7. 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 air filter housing (Fig. 19).
8. Swing the cover to the left until the air filter screw contacts
the air filter housing (Fig. 19).
9. Twist the air filter screw clockwise into the screw hole until it
stops. DO NOT OVERTIGHTEN.
10
MAINTENANCE AND REPAIR INSTRUCTIONS
Screen
Air Filter
Air Filter
Housing
Air Filter Cover
Fig. 19
Fig. 20

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable. An idle adjustment screw
is reached though a hole in the top of the engine cover (Fig. 22).
NOTE: Careless adjustments can seriously damage your unit.
For carburetor adjustments, take your unit to a qualified
service dealer.
Idle
Adjustment
Screw
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:
This unit needs to run during idle speed
adjustment. Wear protective clothing and observe all
safety instructions to prevent serious personal injury.
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.
NOTE: Ensure the tines are not in contact with the ground
when adjusting the idle.
2. Release the throttle trigger and let the engine idle. If the
engine stops, insert a small phillips or flat blade screwdriver
into the hole in the air filter/muffler cover (Fig. 22). Turn the
idle speed screw in, clockwise, 1/8 of a turn at a time (as
needed) until the engine idles smoothly.
NOTE: The tines should not rotate when the engine idles.
3. If the tines rotate 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 a qualified service dealer.
Fig. 21
1 2 3
Fig. 22