BE Pressure supply 80 Gallon Air Compressor AC5080B3 - Manual (Page 12)

Troubleshooting
This section provides a list of the more frequently encountered compressor
malfunctions, their causes and corrective actions. Some corrective actions can
be performed by the operator or maintenance personnel, and others may require
assistance of a qualified electrician or Service Center.
PROBLEM POSSIBLE CAUSE
Motor does not turn. A, B, C, D, E
Motor overload trips or draws excessive current. D, G, M
Excessive noise, vibration, knocking or rattling. H, I, K, L, N, O, P, R, W
Lights flicker or dim when running. C, D, E, J, M
Air delivery drops off. I, P, L, M, N, O, P, R, W, X, Y
Compressor does not come up to speed. C, D, F, H, L, M, P
Compressor is slow to come up to speed. C, D, F, H, L, M, N
Compressor will not unload cycle. I, N, P, R
Compressor will not unload when stopped. I, N, P, R
Excessive starting or stopping. D, E, G, P, S, U
Moisture in crankcase, “milky” substance in oil. T
Oil in discharge air. V
Safety/relief valve “pops”. N, O, P
Low interstage pressure. Y
High interstage pressure. X
POSSIBLE CAUSE POSSIBLE SOLUTION
A.) Circuit breaker on motor tripped. Push button located on back of motor.
B.) Supply line circuit breaker tripped. Reset circuit breaker.
C.) Wiring or electric service panel too small. Install properly sized wire or service box. Contact electrician.
D.) Compressor wired incorrectly. Check wiring, contact electrician.
E.) Poor contact on motor terminals or starter connections Ensure good contact on motor terminals or starter connections.
F.) Compressor viscosity too high for ambient temperature. Drain existing lubricant and refill with proper lubricant.
G.) Poor ground. Check all ground connections.
H.) Belt tension too tight or sheaves not aligned. Check tension/alignment.
I.) Air leaks in discharge piping. Check tubing connections, Tighten joints or replace as required.
J.) Poor power regulation. Contact power company.
K.) Compressor components leaky, broken, loose. Inspect components. Clean or replace as required.
L.) 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.
M.) Leaking check valve or check valve seat blown out. Replace check valve.
N.) Clogged or dirty inlet and/or discharge line. Clean or replace.
O.) Defective safety/relief valve. Replace.
P.) Pressure switch unloader leaks or does not work. Replace.
Q.) Inadequate ventilation around flywheel. Relocate compressor for better air flow.
R.) Leaking, broken or worn inlet unloader parts at check valve. Inspect parts and replace as required.
S.) Excessive condensation in receiver tank. Drain receiver tank.
T.) Detergent lubricant/water in crankcase. Replace with proper lubricant.
U.) Light duty cycle. Increase duty cycle.
V.) Lubricant level too high. Drain excess lubricant.
W.) Worn cylinder finish. Deglaze cylinder with 180 grit flex-hone.
X.) Low pressure inlet valve leaking. Inspect, clean or repair as required.
Y.) High pressure inlet valve leaking. Inspect, clean or repair as required.