Governor Malfunction; Governor Control Line; Compressor Unloader Leakage - BENDIX BA-921 COMPRESSOR-STD-CLOSED ROOM Service Data Sheet

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
Test 5: Governor Control Line
1. Ensure that the governor control line from the
reservoir is located at or near the top of the res-
ervoir. (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 fi tting 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 fi tting followed by a shut-off valve and an
air source (shop air or small air tank). Open the
Tests (continued)
supply reservoir, service reservoir, or reservoir
port of the D-2
cut-out pressures are within vehicle OEM
specifi cation.
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 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.
™ governor, verify cut-in and
A-15