Makita MAC5501G Operating Instructions Manual page 17

PROBLEM
System pressure leaking back
through check valve when
compressor is stopped.
Wrong oil being used
Excessive Loose compressor, engine or
vibration engine guard
Compressor not level
Leg bolts over tightened to
floor
Excessive discharge pres-
sure
Wrong oil being used
Loose flywheel, drive, pulley
or drive belts
Worn connector rods, wrist
pin or main bearings
Compressor Compressor valves loose or
Knocks broken
Check valve knocks at low
pressure
Compressor Clogged inlet filter
uses too
much oil Wrong oil being used, wrong
viscosity
Oil level too high
Crankcase breather valve
malfunction
Compressor runs unloaded
too long
TROUBLE SHOOTING
POSSIBLE CAUSE CORRECTIVE ACTION
Check and replace check
valve if necessary
Drain and replace with proper
oil
Tighten components
Level compressor
Loosen leg bolts
Reduce operating pressure
Drain and replace with proper
oil
Tighten loose components and
check belts
Check and replace worn parts
Check and replace worn or
broken valves
Remove and clean check
valve
Clean inlet filter or replace as
necessary
Drain and replace oil
Fill compressor with oil to
proper level
Replace crankcase breather
Increase load or stop compres-
sor when not needed. Check
for air leaks
Page 17