TROUBLESHOOTING GUIDE (CONTINUED)
MAINTENANCE
/
REP
AIR
TROUBLESHOOTING
OPERA
TION
ASSEMBL
Y
/
INST
ALLA
TION
SAFETY
/
SPECIFICA
TIONS
GETTING ST
ARTED
11
SYMPTOM
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
Excessive noise (knocking)
(Continued)
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
7. Replace.
Oil in the discharge air
1. Worn piston rings
1. Replace with new rings.
2. Compressor air intake restricted
2. Clean filter. Check for other restrictions in the
intake system.
3. Restricted breather
3. Clean and check breather for free operation.
4. Excessive oil in compressor
4. Drain down to full level.
5. Wrong oil viscosity
5. Use FSC-1000A ISO-100 Premium Reciprocating
Compressor Lubricant
6. Connecting rod out of alignment
6. Replace rod.
Air leaking from unloader on
pressure switch
Check valve stuck in open position
Remove and replace check valve
Do not disassemble check
valve with air in tank.