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Failure
Possible Cause
Corrective Action
Oil level is too high
Reduce oil to proper level. See
Compressor Pump Oil under Pump Oil.
Knocking sound
Defective safety valve
Operate safety valve manually by pulling
on the ring. If the valve still leaks, it must
be replaced.
Loose belt
Check belt tension. See Adjusting Belt
Tension under Belt Replacement / Belt
Tension / Motor Pulley & Flywheel
Adjustment.
Loose pulley
Tighten pulley set screw, torque to 15-20
ft./lb. (20.3-27.1 Nm).
Loose flywheel
Tighten flywheel screw, torque to
14
–18 ft./lb. (20.0–24.4 Nm).
Carbon build-up in pump
Contact an authorized service center.
Belt too tight
Check belt tension. See Adjusting Belt
Tension under Belt Replacement / Belt
Tension / Motor Pulley & Flywheel
Adjustment.
Pump oil is low
Add synthetic blend, non-detergent air
compressor oil to pump. See Compressor
Pump Oil under Pump Oil.
Excessive belt wear
Loose belt
Check belt tension. See Adjusting Belt
Tension under Belt Replacement / Belt
Tension / Motor Pulley & Flywheel
Adjustment.
Loose pulley
Tighten flywheel screw, torque to
14
–18 ft./lb. (20.0–24.4 Nm).
Belt too tight
Check belt tension. See Adjusting Belt
Tension under Belt Replacement / Belt
Tension / Motor Pulley & Flywheel
Adjustment.
Pulley misalignment
See Motor Pulley/Flywheel Alignment
under Belt Replacement / Belt Tension /
Motor Pulley & Flywheel Adjustment.
Squealing sound
Loose belt
Check belt tension. See Adjusting Belt
Tension under Belt Replacement / Belt
Tension / Motor Pulley & Flywheel
Adjustment.