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Test 4: Governor Malfunction
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
Test 5: Governor Control Line
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.)
Test 6: Compressor Unloader Leakage
®
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 shut
Tests (continued)
reservoir, service reservoir, or reservoir port
of the D-2
out pressures are within vehicle OEM
specification.
3. If the governor is malfunctioning, replace it.
2. Perform proper reservoir drain intervals and
air dryer cartridge maintenance per
Maintenance Schedule and Usage Guidelines
(Table A on page 17).
3. Return the vehicle to service.
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.
™
governor, verify cut-in and cut-
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