CUMMINS N14 - Air Governor (Air Compressor Will Not Pump)

Use a valve spring tester to check the unloader spring.
NOTE: A compressor spring force specifications chart is
shown on Page 4-5.
Replace the unloader spring if it does not meet the spec-
ifications shown, or the wrong spring has been used.
NOTE: For Holset or Cummins two cylinder air compres-
sors, check both cylinder and center unloader springs.
Cummins Engine Company, Inc., recommends that new
springs be installed during rebuild.
NOTE: If the compressor has a flat hat type unloader valve
(1), it must use unloader spring, Part No. 150631.
Installation
Assemble the air compressor.
Operate the engine and check the compressor for air
leaks.
Air Governor (Air Compressor Will Not
Pump) (4-04)
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.
Section 4 - Compressed Air System Air Governor (Air Compressor Will Not Pump) (4-04)
N14 Page 4-13