Bendix Commercial Vehicle Systems TROUBLE SHOOTING COMPRESSOR - Manual (Page 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 foot 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 off and charge
the unloader port by allowing air pressure to enter
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.
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 3).
3. Return the vehicle to service.
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.
See Bendix Technical Bulletin TCH-001-060 for
more information on unloader pistons
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3. If the governor is malfunctioning, replace it.