If the air compressor does not stop pumping (air pressure
continues to rise) at the governed air pressure, connect
a regulated shop air pressure line to one of the following:
• The air compressor unloader valve port
• One of the air governor unloader valve ports.
NOTE: Be sure the air pressure gauge is accurate, and the
supply lines and fittings are in good condition before per-
forming any air pressure checks.
Use a master gauge of known accuracy to check the air
pressure gauge.
Apply 690 kPa [100 psi] air pressure to the unloader port.
If the air compressor stops pumping (air pressure stops
rising), the air governor is malfunctioning and must be
repaired or replaced, or the air governor mounting gasket
is leaking. Refer to the manufacturer’s instructions.
If the air compressor continues to pump (air pressure
continues to rise), the unloader valve is malfunctioning,
and must be repaired or replaced. Refer to Procedure
4-03.
Section 4 - Compressed Air System Air Governor (4-05)
N14 Page 4-15
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