TM 5-2420-230-24-2
Air Governor (Air Compressor Will Not Pump) (012-017)
B3.9 and B5.9 Series Engines
Page 12-18
Section 12 - Compressed Air System - Group 12
Air Governor (Air Compressor Will
Not Pump) (012-017)
Test (012-017-012)
Remove the air governor hose from the air compressor
unloader body.
If the air governor is mounted directly on the air compres-
sor, then remove the air governor from the compressor.
CAUTION
During this test, do not exceed maximum vehicle air
system pressure or 1035 kPa [150 psi], whichever is
lower. Refer to the manufacturer's specifications.
Operate the engine to activate the air compressor.
If the air compressor does not pump, then the fault is in the
air compressor.
Remove and inspect the cylinder head and unloader com-
ponents. Refer to the Master Repair Manual, Holset Air
Compressors, Bulletin No. 3666121. If no problems are
found during disassembly or inspection of the cylinder
head or unloader components, then the compressor should
be removed and disassembled to determine the cause of
the problem.
Refer to Procedure 012-014 and SS191 Single-Cylinder Air
Compressor Shop Manual, Bulletin No. 3810433.
CAUTION
During this test, do not exceed maximum vehicle air
system pressure or 1035 kPa [150 psi], whichever is
lower. Refer to the manufacturer's specifications.
Operate the engine, and check air compressor operation
with the air governor removed.
L-1222
