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Operating Instructions and Parts List
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Troubleshooting Chart
Symptom Possible Cause(s) Corrective Action
Low discharge pressure 1. Air leaks 1. Listen for escaping air. Apply soap solution to all fittings and
connections. Bubbles will appear at points of leakage. Tighten or
replace leaking fittings or connections
2. Slipping belts 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 inch under 5-lbs of pressure. Do
not “roll” belts over pulleys
3. Air demand exceeds pump capacity 3. Reduce air demand or use a compressor with more capacity
4. Blown gaskets 4. Replace any gaskets proven faulty on inspection
5. Leaking valves 5. Remove head and inspect for valve breakage, misaligned valves,
damaged valve seats, etc. Replace defective parts and reassemble.
Install a new head gasket
each time the head is removed
6. Restricted air intake 6. Clean the air filter element
7. Low compression 7. Low pressure can be due to worn rings and cylinder walls.
Correction is made by replacing the rings, cylinders, and pistons as
required
Pump overheating causes
air filter to melt
Broken valves/blown gasket Replace valve or install new gasket
Excessive noise (knocking) 1. Loose motor or compressor pulley 1. Loose motor or compressor pulleys are a very common cause of
compressors knocking. Tighten pulley clamp bolts and set-screws
2. Lack of oil in crankcase 2. Check for proper oil level; if low, check for possible damage to
bearings. Dirty oil can cause excessive wear
3. Worn connecting rod 3. Replace connecting rod; maintain oil level and change oil more
frequently
4. Worn piston pin bores 4. Remove piston assemblies from the compressor and inspect for
excess wear. Replace excessively worn piston pin or pistons, as
required; maintain oil level and change oil more frequently
5. Worn bearings 5. Replace worn bearings and change oil
6. Piston hitting the valve plate 6. 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
7. Noisy check valve in compressor
system
7. Replace check valve.
Do not disassemble check
valve with air pressure in tank
Large quantity of oil in
the discharge air
NOTE: In an oil lubricated
compressor there will
always be a small amount
of oil in the air stream.
1. Worn piston rings 1. Replace with new rings. Maintain oil level and change oil more
frequently.
2. Compressor air intake restricted 2. Clean filter. Check for other restrictions in the intake system.
3. Excessive oil in compressor 3. Drain down to full level.
4. Wrong oil viscosity 4. Use Mobil 1
®
10W-30
Water in discharge air /
tank
Normal operation. The amount of
water increases with humid weather
1. Drain tank more often. At least daily.
2. Add a filter to reduce the amount of water in the air line.