Husqvarna 455 Rancher II Workshop Manual page 40

Repair Instructions
Cleaning and inspection
Clean all units in clean petrol.
Use compressed air to dry the petrol on the
components. Direct the air through all channels in
the carburetor housing and ensure that they are
not blocked. Check the following:
1. That the gasket, pump and control diaphragms
are undamaged, and so the gasket between
the carburetor body and the autotuner.
2. That there is no play on the throttle valve and
choke valve shafts.
3. That the needle valve M and its lever arm Q are
not worn. See figure 38.
4. That the fuel screen W is intact and clean. See
figure 39.
5. That the inlet manifold V is intact. See figure 39.
6. Use the service tool, Engine Diagnostic Tool
576 69 23-01, to inspect the AutoTune unit.
See separate instruction.
Fig 39
40 –
English
S
W
X
Y
U
Assembly
Observe cleanliness when assembling the car-
buretor. The slightest contamination can result in
downtime.
1. If the throttle and choke valves with shafts, le-
ver arms and springs are removed, they must
be reassembled. The springs are tensioned
1-2 turns. Lubricate the shaft bearings using a
light oil.
2. Fit the fuel screen W using the handle of a
small screwdriver. See figure 39.
3. Fit the gasket X in the carburetor as well as the
holder Y. Screw in place screw Z as outlined in
figure 38.
4. See figure 39 on how to assemble the
AutoTune AB unit with gasket.
Note! When replacing the AutoTune unit or
carburetor with an AutoTune unit, the unit
must first be programmed before it can be
used. Refer to the local support page for more
information.
V
Z
T