Husqvarna RedMax GZ550 Workshop Manual page 42

Repair Instructions
Pressure testing the carburetor
Pressure testing should be carried out with the car-
buretor fully assembled. Testing should always be
carried out after the carburetor has been repaired
but a test can also be made for troubleshooting
before dismantling.
Test 1
See figure 43 and check as follows:
1
Connect pressure gage 531 03 06-23 to the carbu-
retor's fuel intake.
2
Submerge the carburetor into a container with
water. See figure 43.
3
Pump up the pressure to 20 kPa.
4
No leakage is permitted. In case of leaks, see the
table below.
Leakage at
Diffuser jets
Leakage in the impulse
pipe
Ventilation hole on
metering unit
Test 2
1
Plug the connections to the fuel inlet.
2
Create a vacuum to the purge nipple on the carbu-
retor. No leakage is permitted. In case of leakage,
leakage spray may be used with some difficulty.
Try and identify where the spray is absorbed. It
can be used to show leakages in main jets, idling
needles, measuring cover gaskets, measuring
diaphragms and the AutoTune gasket.
41 –
English
Fault with
Needle valve
Pump diaphragm
Control diaphragm
Fig 43