Husqvarna 390 XP W, Руководство по ремонту

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English - 37
Carburettor
7. Fit the control diaphragm (F) with packing and cover
(E) on the metering unit. See fig. 16.
8. Do a pressure test.
Fig. 16
Fig. 17
G
H
I
J
K
L
F
E
Fig. 18
Fig. 17
Fig. 18
A
C
B
14.7 Pressure testing the carburettor
Pressure testing must be done with the carburettor fully
assembled. Testing must always be done after the car-
burettor has been repaired, but it can also be done as
trouble shooting before disassembling the carburettor.
See fig. 17 and do the test as follows:
1. Unscrew the high and low speed screws one turn
from home position.
2. Connect pressure tester (Refer to ”3 Service tools”
on page 8) to the fuel intake of the carburettor.
3. Lower the carburettor into a beaker of water.
4. Pump up the pressure to 50 kPa (0.5 bar) and
squeeze together the tube.
5. No leakage is permitted. If there is a leak, refer to the
table below.
Leakage at Fault with
Diffuser jets
Leakage in impulse
tube
Ventilation hole on me-
tering unit. Needle valve
Pump diaphragm
Control diaphragm
14.8 Assemble on the chainsaw
See fig. 18.
1. Loosen the filter holder and put the carburettor in
place on the chainsaw.
2. Fit the filter holder, carburettor and intake manifold.
Tighten the bolts (Refer to “4 Service data” on page
10) .
3. Fit the fuel pipe (B) on the fuel nipple and the tube
(C) on the impulse nipple.
4. Fit the throttle cable and choke control.
5. Fit the carburettor control (A).
6. Fit the cylinder cover and air filter. Refer to the Op-
erators Manual.