34
A-15
1. Ensure that the governor control line from
the reservoir is located at or near the top of
the reservoir. (This line, if located near the
bottom of the reservoir, can become blocked or
restricted by the reservoir contents e.g. water
or ice.)
Bendix
®
Compressors:
Park vehicle, chock
wheels, and follow all standard safety procedures.
Remove the governor and install a fitting to the
unloader port. Add a section of air hose (min
1 ft long for a 1/2" diameter line) and a gauge
to the fitting followed by a shut-off valve and an
air source (shop air or small air tank). Open the
Test 5: Governor Control Line
Test 6: Compressor Unloader Leakage
1. Inspect control lines to and from the governor
for restrictions (e.g. collapsed or kinked).
Repair as necessary.
2. Using a calibrated external gauge in the supply
reservoir, service reservoir, or reservoir port
of the Bendix
®
D-2
®
governor, verify cut-in
and cut-out pressures are within vehicle OEM
specification.
3. If the governor is malfunctioning, replace it.
Tests (continued)
Test 4: Governor Malfunction
2. Perform proper reservoir drain intervals and air
dryer cartridge maintenance per Maintenance
Schedule and Usage Guidelines (Table A on
page A-3).
3. Return the vehicle to service.
shut-off and charge the unloader port by allowing
air pressure to enter the hose and unload the
compressor. Shut off the air supply and observe
the gauge. A steady reading indicates no leakage
at the unloader port, but a falling reading shows
that the unloader mechanism is leaking and needs
to be serviced.
