Operate the engine to activate the air compressor.
If the air compressor is pumping, the air governor is
malfunctioning and must be repaired or replaced. Refer
to the manufacturer’s instructions.
If the air compressor does not pump, remove, clean, and
inspect the air compressor unloader valve assembly. Re-
fer to Procedure 4-03.
If the unloader valve assembly is okay, clean and inspect
the exhaust valve assembly. Refer to Procedure 4-06.
Air Governor (4-05)
Checking
NOTE: The illustrations shown will be of the single cylinder
air compressor. Differences in procedures for one and two
cylinder Cummins air compressors will be shown where
necessary.
Remove the air governor or air governor line from the air
compressor unloader body.
Install pipe plugs in the air governor unloader ports where
accessory air lines were removed.
Operate the engine to activate the air compressor.
If the air compressor stops pumping (air pressure stops
rising) at the governed air pressure, there is a leak in an
accessory or an accessory air line. Refer to the equip-
ment manufacturer’s instructions for troubleshooting and
repair.
Air Governor (4-05) Section 4 - Compressed Air System
N14Page 4-14
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