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Troubleshooting Chart
Symptom
Low discharge pressure
Motor will not run or
motor runs and stops
NOTE: Electric models are
equipped with a pressure
switch that automatically
turns the motor OFF when
the tank pressure reaches a
preset level. After air is used
from the tank and drops to
a preset low level, the
pressure switch
automatically turns the
motor back on.
Excessive belt wear
Excessive noise (knocking)
Oil in the discharge air
Possible Cause(s)
1. Air leaks
2. Slipping belts
3. Restricted air intake
4. Blown gaskets
5. Leaking valves
1. Circuit breaker tripping,
overloaded power supply
2. Low oil level
3. Motor protection tripping,
overheating
4. Defective check valves
5. Defective pressure switch
6. Overloaded motor
1. Pulley out of alignment
2. Belt too loose or too tight
3. Belt slipping
4. Pulley wobbles
1. Loose motor or
compressor pulley
2. Lack of oil in crankcase
3. Piston hitting the valve
plate
4. Noisy check valve
1. Restricted breather
2. Compressor air intake
restricted
3. Excessive oil in compressor
4. Wrong oil viscosity or type
5. Worn piston rings
Corrective Action
1. Listen for escaping air. Apply soap solution to all fittings
and connections. Bubbles and spray will appear at points of
leakage. Slight bubbles are not significant. If a spray occurs,
tighten or replace leaking fittings or connections
2. Loosen motor clamping bolts and move the motor in a
direction away from the compressor, being sure that the
motor pulley is perfectly aligned with the flywheel. Tighten
motor clamping bolts. The belt should deflect about 1/2"
under 5-lbs of force. Do not "roll" belts over pulleys
3. Clean the air filter element
4. Replace any gaskets proven faulty on inspection
5. Remove head and inspect for valve breakage, damaged
valve seats, etc. Replace defective parts and reassemble
Be sure that the old head gasket is
replaced with a new one each time the
head is removed
1. Turn off all other electrical loads on the circuit. Reset circuit
breaker or replace fuse
2. Check oil level. Fill if necessary. Check for excessive wear if
run without oil. Replace worn parts as necessary
3. Allow motor to cool down and reset motor protector button
4. Replace
5. Replace
6. Have certified electrician check the motor and wiring, then
proceed with his/her recommendations. Check motor
voltage connection
1. Realign motor pulley with compressor pulley
2. Adjust tension (See Belt Drive Section)
3. Adjust tension or replace belt (See Belt Drive Section)
4. Check for worn crankshaft, keyway or pulley bore resulting
from running the compressor or motor with loose pulleys.
Check for bent pulleys or bent crankshaft
1. Loose motor or compressor pulleys are a very common cause
of compressors knocking. Tighten pulley clamp bolts and
set-screws
2. Check for proper oil level; if low, check for possible damage
to bearings. Dirty oil can cause excessive wear
3. Remove the compressor head and valve plate and inspect
for carbon deposits or other foreign matter on top of piston.
Replace head and valve plate using new gasket
4. Replace
1. Clean and check breather for free operation
2. Clean filter. Check for other restrictions in the intake system
3. Drain down to full level
4. Use SAE 30 industrial grade air compressor oil
5. Replace with new rings
7
Vertical Models
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