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TROUBLESHOOTING CHART
Symptom
Possible Cause(s)
Excessive noise in
1. Loose pulley, flywheel, belt, belt
operation
guard, cooler, clamps or accessories
2. Lack of oil in crankcase
3. Piston hitting the valve plate
4. Compressor floor mounting loose
5. Defective crankcase
6. Excessive crankcase end play
Knock – same cycle
1. Main bearings
as RPM of pump
2. Connecting rod bearings
3. Loose flywheel
Knock occurs while
1. Connecting rod bearings
compressor is loading
2. Wrist pins, wrist pin bearings
3. Loose connecting rod nut
Milky oil in oil reservoir Water entering oil reservoir due to
compressor operating in high humidity
environment
Excessive oil
1. Restricted air intake
consumption
2. Oil leaks
3. Worn piston rings
4. Wrong oil viscosity
5. Compressor tilted too much
6. Scored cylinder
Oil in discharge air
1. Compressor air intake restricted
2. Worn piston rings
3. Excessive oil in compressor
4. Wrong oil viscosity
Compressor vibrates
1. Mounting bolts loose
2. Compressor not properly mounted
3. Pulley and flywheel mis-aligned
4. Belts loose or mismatched
5. Bent crankshaft
Air blowing out of inlet Broken inlet valve
Insufficient pressure at
1. Leaks or restriction
point of use
2. Restricted air intake
3. Slipping belts
4. Service hose or pipe too small
5. Excessive air requirement
6. Broken valve
10
Corrective Action
1. Tighten
2. Check for possible damage to bearings, replenish oil
3. Remove the compressor cylinder head and inspect for foreign matter on
top of the piston. Replace with a new gasket and reassemble the head
4. Tighten
5. Repair or replace
6. Adjust and shim properly
1. Replace bearings
2. Replace rod
3. Tighten
1. Replace rod
2. Replace complete piston assembly
3. Tighten
a. Pipe air intake to less humid air source
b. Service unit (change oil, clean or replace air cleaner element, drain tank) more
often
1. Clean or replace air filter
2. Tighten bolts or replace gasket
3. Replace rings
4. Drain oil, refill with oil of proper viscosity. See "Pump Lubrication"
5. Level compressor
6. Replace cylinder and rings
1. Clean air filter element and check for other restrictions in the
intake system
2. Replace rings
3. Drain down to proper level
4. Check viscosity. See " Pump Lubrication"
1. Tighten
2. Level compressor so that all feet touch the floor before
tightening down. Use shims if necessary
3. Realign
4. Tighten belts. See "Maintenance" section
5. Replace crankshaft
Replace valve plate assembly
1. Check for leaks or restriction in hose or piping. Repair or replace
2. Clean or replace air filter element
3. Tighten belts, See
"Maintenance"∆
4. Replace with larger hose or pipe
5. Limit air usage to compressor capacity by using fewer or smaller tools
6. Replace reed valve assembly
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