Troy-Bilt TB310QS Bedienungsanleitung PDF herunterladen (Seite 18)

MAINTENANCE AND REPAIR INSTRUCTIONS

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason

for improper unit performance. Drain and refill the tank

with fresh, properly-mixed 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 and

change the air/fuel mixture. This is often mistaken for an

out of adjustment carburetor. Check the condition of the

air filter before adjusting the idle speed screw. Refer to

Air Filter Maintenance.

Adjust Idle Speed Screw

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable through the air

filter/muffler cover (Fig. 29).

NOTE: Careless adjustments can seriously damage your

unit. An authorized service dealer should make

carburetor adjustments.

Checking the fuel mixture, cleaning the air filter, and

adjusting the idle speed should solve most engine

problems.

REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug, or equivalent. The

correct air gap is 0.020 inch (0.5 mm). Remove the plug

after every 25 hours of operation and check its condition.

1. Stop the engine and allow it to cool. Grasp the plug

wire firmly and pull it from the spark plug.

2. Clean around the spark plug. Remove the spark plug

from the cylinder head by turning a 5/8-inch socket

counterclockwise.

3. Replace a cracked, fouled or dirty spark plug. Set

the air gap at 0.020 in. (0.5 mm) using a feeler gauge

(Fig. 30).

4. Install a correctly-gapped spark plug in the cylinder

head. Tighten by turning the 5/8-inch socket

clockwise until snug.

If using a torque wrench torque to:

110-120 in.•lb. (12.3-13.5 N•m)

Do not over tighten.

0.020 in.

(0.5 mm)

Fig. 30

Idle Speed

Screw

Fig. 29

If after checking the fuel mixture and cleaning the air

filter the engine still will not idle, adjust the idle speed

adjuster as follows.

1. Start the engine and let it run at the fast position for a

minute to warm up.

2. Set the blower/vacuum mode change-over lever to

the up position (Blower Mode). Refer to Operating as

a Blower.

NOTE: Setting the lever to the blower mode prevents the

vacuum bag from filling up while starting or

running the unit.

3. Move the throttle control and let the engine idle. If the

engine stops, insert a small phillips screwdriver into

the hole in the air filter/muffler cover (Fig. 29). Turn

the idle speed adjuster in, clockwise, 1/8 of a turn at

a time (as needed) until the engine idles smoothly.

4. If the unit appears to be idling too fast, turn the idle

speed adjuster counterclockwise 1/8 of a turn at a

time (as needed), to reduce idle speed.

Do not sand blast,

scrape or clean

electrodes. Grit in the engine could damage

the cylinder.

WARNING:

This unit will need

to be running during

idle speed adjustment. Wear protective

clothing and observe all safety instructions

to prevent serious personal injury.

Also, DO NOT set unit on any surface

except a clean, hard area while starting or

performing any adjustments. Debris such

as gravel, sand, dust, grass, etc. could be

picked up by the air intake and thrown out

by the discharge opening, damaging unit,

property, or causing serious injury to

bystanders or operator.

WARNING:

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.

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