Bendix Commercial Vehicle Systems TU-FLO 750 COMPRESSOR 6/08 - Manual (Page 30)

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
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.
off and charge the unloader port by allowing air
pressure to enter the hose and unload the com-
pressor. 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.
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