User's Manual

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 ﬁ tting to the

unloader port. Add a section of air hose (min 1ft

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 shut off and

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 D-2

governor, verify cut-in and

cut-out pressures are within vehicle OEM

speciﬁ cation.

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 18).

3. Return the vehicle to service.

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.