Husqvarna TrioBrake 550XPG Workshop Manual page 44

Cleaning and inspection
Clean all units in clean petrol.
Use compressed air to dry the petrol on the com-
ponents. Direct the air through all channels in the
carburettor housing and ensure that they are not
blocked. Check the following:
1. That the gasket, pump and control diaphragms
are undamaged, as well as the gasket between
the carburettor body and the autotuner.
2. That there is no play on the throttle and choke
valve shafts.
3. That the needle valve M and its lever arm O are
not worn. See figure 38.
4. That the fuel screen U is intact and clean. See
figure 40.
5. That the inlet manifold T is intact. See figure 40.
6. Use the service tool, Engine Diagnostic Tool
576 69 23-01, to inspect the AutoTune unit Y.
See separate instruction.
R
S
Fig 40
44
- English
Assembly
Observe cleanliness when assembling the car-
burettor. The slightest contamination can result in
downtime.
1. If throttle and choke valves with shafts, lever
arms and springs are removed, these must be
assembled. The spring is tensioned 1-2 turns.
Lubricate the shaft bearings using a light oil.
2. Fit the fuel screen U using the handle of a small
screwdriver. See figure 40.
3. Fit the gasket V in the carburettor as well as the
holder W. Screw in place screw X as outlined in
figure 40.
4. See figure 40 on how to assemble the
AutoTune unit Y with gasket.
NOTE!
When replacing the AutoTune unit or
carburettor with an AutoTune unit, the unit
must first be programmed before it can be
used. Refer to the local support page for
more information.
T
U
V
W
Z
X
Y