Husqvarna 555 XP Workshop Manual page 40

Repair Instructions
Pressure testing the carburettor
Pressure testing should be carried out with the car-
burettor fully assembled. Testing should always be
carried out after the carburettor has been repaired,
but a test can also be made for troubleshooting
before dismantling.
Option 1
See the figure and carry out the check as follows:
1
Connect pressure tester to the carburettor fuel inlet.
2
Submerge the carburettor into a container with
water. See figure 43.
3
Pump up the pressure to 20 kPa.
4
No leakage is permitted. If a leakage occurs refer
to the table below.
Option 2
1
Plug the connections to the fuel inlet.
2
Create a vacuum to the purge nipple on the car-
burettor. No leakage is permitted. In the case of
leakage, leakage spray can be used even it if is dif-
ficult. Try and identify where the spray is absorbed.
It can be used to show leakages in main jets, idling
needles, measuring cover gaskets and measuring
diaphragms, and autotune gaskets.
Leak in
Diffuser jets
Leak in the impulse pipe Pump membrane
Ventilation hole on the
metering unit.
Fitting on the saw
1
Press the connector together as outlined in figure
44 and push it into place in the holder.
40
- English
Fault with
Needle valve
Control membrane
Fig 43
Fig 44
Fig 45