Troy-Bilt TB490BC - Manual (Page 21)

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3. Wash the filter in detergent and water (Fig. 45). Rinse
the filter thoroughly and allow it to dry.
4. Apply enough clean SAE 30 motor oil to lightly coat
the filter (Fig. 46).
Fig. 45
5. Squeeze the filter to spread and remove excess oil
(Fig. 47).
Fig. 48
Back Plate Slot
Slots
6. Replace the filter (Fig. 48).
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 left side of the air filter cover into the slots at the
left side of the back plate (Fig. 48).
NOTE: It may be necessary to remove the fuel cap to
reinstall the air filter cover.
8. Swing the cover to the right until the tab on the air
filter cover snaps into place in the slot on the back
plate (Fig. 48).
9. Replace the fuel cap if it was removed.
Back Plate
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. 49).
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.
Fig. 47
Fig. 46
MAINTENANCE AND REPAIR INSTRUCTIONS