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This section provides a list of the more frequently encountered compressor pump malfunctions, their causes and
corrective actions. Some corrective actions can be performed by the operator or maintenance personnel, but others
may require assistance of a qualified Service Center.
PROBLEM
Excessive noise, vibration, knocking or rattling.
Lights flicker or dim when running.
Air delivery drops off.
Compressor pump does not come up to speed.
Compressor pump is slow to come up to speed.
Compressor pump will not unload cycle.
Compressor pump will not unload when stopped.
Moisture in crankcase, "milky" substance in oil.
Oil in discharge air.
Safety/relief valve "pops".
Low interstage pressure.
High interstage pressure.
POSSIBLE CAUSE
A.) Pump oil viscosity too high for ambient temperature
B.) Belt tension too tight or sheaves not aligned
C.) Compressor pump components leaky, broken, loose
D.) Loose flywheel or motor pulley, excessive end play in
motor shaft or loose drive belts
E.) Leaking check valve or check valve seat blown out
F.) Clogged or dirty inlet and/or discharge line
G.) Defective safety/relief valve
H.) Inadequate ventilation around flywheel
I.) Detergent lubricant in crankcase.
J.) Lubricant level too high
K.) Worn cylinder finish
L,) Low pressure inlet valve leaking
M.) High pressure inlet valve leaking
Any Questions, Comments, Problems or Parts Orders call NorthStar Product Support
Troubleshooting
Drain existing lubricant and refill with proper lubricant.
Inspect components. Clean or replace as required.
Check flywheel, motor pulley, crankshaft drive belt
tension/alignment. Replace or repair as required.
Relocate compressor pump for better air flow.
Deglaze cylinder with 180 grit flex-hone.
at 1-800-270-0810.
15
POSSIBLE CAUSE
B, C, D, F, G, K
E
D, E, F, G, H, K, L, M
A, B, D, E
A, B, D, E, F
F
F
I
J
F, G
M
L
POSSIBLE SOLUTION
Check tension/ alignment.
Replace check valve.
Clean or replace.
Replace.
Replace with proper lubricant.
Drain excess lubricant.
Inspect, clean or repair as required.
Inspect, clean or repair as required.
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