Husqvarna 335XPT Workshop Manual page 30

5. Fit the high speed needle (H) as follows:
A. Screw in the new H-needle clockwise until it bottoms.
Thereafter counter-clockwise 3 1/2 turns.
B. Press on a new locking cap on the H-needle until the
first stop, i.e. the locking cap should not be fixed.
6. Fit the low speed needle (L) as follows:
A. Screw in the new L-needle clockwise until it bottoms.
Thereafter counter-clockwise 1 3/4 turns.
B. Press on a new locking cap on the L-needle until the first
stop, i.e. the locking cap should not be fixed.
7. Fit the pump diaphragm (M), packing (K) and cover (J) on
the pump unit.
8. Fit the needle valve (P) with lever arm (E), shaft and spring
and tighten screw (D).
9. Check using or a ruler or the like that the lever arm (E) is
level with the heels next to the lever arm. The lever arm can
be bent if necessary.
10. Fit the control diaphragm (B) with packing and cover (A) on
the metering unit.
11. Carry out a pressure test.
Pressure testing
Pressure testing should be carried out with the carburettor fully
assembled. Testing should always be carried out after the
carburettor has been repaired, but a test can also be made for
trouble shooting before dismantling.
Check the carburettor as follows:
1. Connect pressure tester 502 50 38-01 to the carburettor's
fuel intake.
2. Lower the carburettor into a beaker of water.
3. Pump up the pressure to 50 kPa (0.5 bar) and clamp the
pump tube.
4. No leakage is permitted. With leakage refer to the table
below.
Leakage from
Diffuser jets
Leakage on the pulse tube
Ventilation hole above
the metering unit
30
– English
CARBURETTOR
Fault with
Needle valve
Pump diaphragm
Control diaphragm