Air Compressor Pumps Continuously
Remove the accessory air lines from the air governor unloader port.
NOTE: Do not disconnect the line from the air compressor unloader valve. Do not disconnect the reservoir air line from the air governor. If the governor is mounted on the compressor, do not remove the governor from the compressor.
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 equipment manufacturer’s instructions for troubleshooting and repair.
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 the the air compressor unloader valve port.
NOTE: If the governor is mounted on the air compressor, then the governor will have to be removed.
NOTE: Be sure the air pressure gauge is accurate and the supply lines and fittings are in good condition before performing 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. 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 4-02.
Remove the pipe plugs from the unloader ports used for accessory air lines.
Install and tighten the accessory air lines.
Connect the line to the unloader valve.
Operate the engine and check for air leaks.
