Troubleshooting - NorthStar M459212B.6 Owner's Manual

Gasoline portable air compressor
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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 Service Center. Contact NorthStar at 1-800-270-0810 for service locations.
PROBLEM
Engine does not start.
Air delivery drops off.
Compressor does not come up to speed.
Compressor is slow to come up to speed.
Compressor will not unload cycle.
Compressor will not unload when stopped.
Excessive starting or stopping.
Moisture in crankcase, "milky" substance in oil.
Oil in discharge air.
Safety/relief valve "pops".
Low interstage pressure.
High interstage pressure.
POSSIBLE CAUSE
A.) Low Oil Shutdown
B.) Cold Engine
C.) No Fuel
D.) Engine not turned ON
E.) Spark plug wire not attached
F.) Compressor viscosity too high for ambient
temperature
G.) Belt tension too tight or sheaves not aligned
H.) Air leaks in discharge piping
I.) Compressor components leaky, broken, loose
J.) Loose flywheel or engine pulley, excessive end play in
engine shaft or loose drive belts
K.) Leaking check valve or check valve seat blown out
L.) Clogged or dirty inlet and/or discharge line
M.) Defective safety/relief valve
N.) Unloader leaks or does not work
O.) Inadequate ventilation around flywheel
P.) Leaking, broken or worn inlet unloader parts at check
Q.) Excessive condensation in receiver tank
R.) Detergent lubricant in crankcase.
S.) Light duty cycle
T.) Lubricant level too high
U.) Worn cylinder finish
V.) Low pressure inlet valve leaking
W.) High pressure inlet valve leaking

Troubleshooting

valve
POSSIBLE CAUSE
H, I, J, L, M, N, P
POSSIBLE SOLUTION
Fill engine with the adequate amount of oil.
Choke engine to start.
Add gas to engine. Make sure fuel shutoff valve is open.
Place ON/OFF switch in the ON position.
Attach spark plug wire to spark plug.
Drain existing lubricant and refill with proper lubricant.
Check tension/ alignment.
Check tubing connections, Tighten joints or replace as
Inspect components. Clean or replace as required.
Check flywheel, engine pulley, crankshaft drive belt
tension/alignment. Replace or repair as required.
Replace check valve.
Clean or replace.
Realign stem or replace.
Relocate compressor for better air flow.
Inspect parts and replace as required.
Drain receiver tank.
Replace with proper lubricant.
Increase duty cycle.
Drain excess lubricant.
Deglaze cylinder with 180 grit flex-hone.
Inspect, clean or repair as required.
Inspect, clean or repair as required.
21
A,B,C,D,E
F, G, J, K
F, G, J, K, L
H, L, N, P
H, L, N, P
N, Q, S
R
T
L, M, N
W
V
required.
Replace.

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