NorthStar 4592900, Owner'S Manual

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