TROUBLESHOOTING & SOLUTIONS
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Knocking 1.
Lack of oil in crankcase
2.
Worn piston pin
3.
Worn main bearings
4.
Worn connecting rod
5.
Excessive crankshaft end play
6.
Dirty or defective check valve
7.
Piston hitting head due to foreign
matter or carbon deposits.
1.
Add oil
2.
Replace pin
3.
Replace bearings
4.
Replace inserts or rod assembly
5.
Take to Service Center
6.
Clean or replace
7.
Inspect, repair or replace valves &
pistons
Overheating
Compressor
1.
Poor ventilation
2.
Dirty cooling surfaces
3.
Dirty or defective check valve
4.
Restricted air intake
5.
Low oil level
6.
Unit not run on level surface
7.
Dirty or defective reed valve
1.
Move compressor to allow for
better ventilation
2.
Clean compressor pump
3.
Clean or replace
4.
Replace filter
5.
Add non-detergent, single viscosity
oil
6.
Level unit
7.
Clean valve plate and replace valves
Low Discharge
Pressure or
Pumps Slowly
1.
Air leaks
2.
Broken or dirty valves
3.
Restricted air intake
4.
Blown gaskets
5.
Defective gauges
6.
Dirty or defective check valve
7.
Compressor too small for application
1.
Check system for air leaks.
2.
Replace or clean valves & valve
plates
3.
Replace filter element
4.
Replace gaskets
5.
Replace gauges
6.
Clean or replace check valve
7.
Consult dealer for larger ROLAIR
compressor
Compressor
Fails to Attain
Proper RPM’s
1.
Defective check valve
2.
Defective pilot valve
1.
Repair or replace check valve
2.
Repair or replace pilot valve
Oil in the
Discharge Air
1.
Worn piston rings
2.
Compressor air intake restricted
3.
Restricted crankcase breather
4.
Excessive oil in basic compressor
pump
5.
Wrong oil viscosity
1.
Replace rings
2.
Replace filter
3.
Clean crankcase breather
4.
Check gauge and adjust to proper
oil level
5.
Drain & replace with non-detergent
single viscosity oil
Excessive Oil
Consumption
1.
Restricted or dirty air filter
2.
Crankcase is over-filled with oil
3.
Valves not seating properly
4.
Worn piston rings
1.
Clean or replace air filter
2.
Drain oil & refill to proper oil level
3.
Clean crankcase breather
4.
See ROLAIR Service Center
Water in
Crankcase
1.
Compressor does not run long
enough to get hot and vaporize the
moisture
2.
Compressor too large for application
3.
Incorrect or inferior grade of oil
1.
Consult dealer about smaller ROLAIR
compressor
2.
Consult ROLAIR dealer
3.
Change oil in compressor
