M11 Series – Service Manual – 012-017   Air Governor (Air Compressor Will Not Pump)

NOTE: The illustrations shown will be of the SS model single cylinder air compressor. Differences in procedures for Holset® models SS, QE, ST, and Cummins air compressors will be shown where necessary.

Remove the air governor or air governor line from the air compressor unloader body.

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. Refer to the Holset® Air Compressor Master Repair Manual, Bulletin 3666121.

If the unloader valve assembly is okay, clean and inspect the exhaust valve assembly. Refer to the Holset® Master Repair Manual, Bulletin 3666121.

NOTE: Not all air compressors referenced can be used on all engine applications.