tRoubLEShootiNg
TROUBLE
No start condition
Low pressure
Safety valve releasing
Oil discharge in air
Insufficient output, low
discharge pressure
Motor stalls or blows
circuit breaker
Excessive vibration/
compressor knocks
Compressor uses too
much oil
POSSIBLE CAUSE
Fuse blown or circuit breaker tripped
Loose electrical connections
Overheated motor
Tank is at full pressure
Air leak in safety valve
Drain cock open
Restricted air filter
Defective check valve
Defective pressure switch or improper
adjustment
Improper oil viscosity
Too much oil in crankcase
Compressor overheated
Restricted air filter
Restricted air filter
Leaks in air lines, air valves, fittings...
Drive belt slipping
Drain valve open
Defective pressure gauge
Leaking head gasket
Worn piston, worn out rings
Defective check valve
Defective check valve
Valves incorrectly installed
Drive belt too tight
Defective pressure switch
Defective motor
Loose compressor, motor or guard
Compressor not level
Over tightened feet bolts
Wrong oil being used
Compressor valves loose or broken
Check valve knocks at low pressure
Restricted air filter
Wrong oil viscosity
Oil level too high
Crankcase breather valve malfunction
Worn piston rings
Piston rings not seated.
CORRECTIVE ACTION
Check voltage or eliminate extension cord or reset
Check wiring connections
Wait for motor to cool, then press the reset button, restart
Drain tank of air pressure
Check valve manually by pulling. If condition persists, replace.
Close drain cock
Clean or replace as necessary
Replace check valve
Check for proper adjustment and if problem persists, replace
pressure switch
Replace oil with SAE 30 non-detergent oil
Drain crankcase and fill to proper level
Air pressure regulated too high
Replace filter
Replace filter
Replace worn components
Tension V-belt
Close drain valve
Replace pressure gauge
Replace head gasket
Replace worn parts
Clean check valve or replace
Clean check valve or replace
Install valves correctly
Tension V-belt correctly
Replace pressure switch
Replace motor
Tighten components
Level compressor
Loosen feet bolts
Drain and replace with proper oil
Check and replace worn or damaged valves
Remove and clean check valve
Replace filter
Drain and replace oil
Fill with oil to proper level
Replace crankcase breather
Replace piston rings
Allow 100 hours of normal operation for new rings to seat
