Models CE7002, CE7003, CE7004
www.CH-Commercial.com
Troubleshooting Guide
SyMptoM
CauSe
Solution
Excessive noise in
operation
1� Loose pulley, flywheel,
belt, belt 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
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.
Knock – same cycle as
RPM of pump
1� Main bearings
2� Connecting rod bearings
3� Loose flywheel
1. Replace bearings.
2. Replace rod.
3� Tighten�
Knock occurs while
compressor is loading
1� Connecting rod bearings
2� Wrist pins, wrist pin
bearings
3� Loose connecting rod nut
1. Replace rod.
2. Replace complete piston assembly.
3� Tighten�
Milky oil in oil reservoir
Water entering oil reservoir
due to compressor
operating in high humidity
environment
a. Pipe air intake to less humid air source.
b� Service unit (change oil, clean or replac�e air cleaner element, drain
tank) more often�
Excessive oil
consumption
1. Restricted air intake
2� Oil leaks
3� Worn piston rings
4� Wrong oil viscosity
5� Compressor tilted too
much
6� Scored cylinder
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 “Lubrication” section�
5� Level compressor�
6. Replace cylinder and rings.
Oil in discharge air
1� Compressor air intake
restricted
2� Worn piston rings
3. Excessive oil in
compressor
4� Wrong oil viscosity
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 “Lubrication” section�
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
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.
Air blowing out of inlet
Broken inlet valve
Replace valve plate assembly.
Continued on next page
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