Troubleshooting guide
WP33L_BA_K1_12_en_08.fm
49
Abnormal compressor
noise.
Connecting rod bearing faulty.
(noise when off-load).
Check connecting rod bearing, replace
if necessary. Check oil supply.
Gudgeon pin bearing faulty. Check gudgeon pin bearing, replace if
necessary.
Crankshaft bearing faulty. Check crank shaft bearing, replace if
necessary.
Motor bearing faulty. Check motor bearing, replace if neces-
sary.
Oil leaking from crankcase. Gasket or shaft seal faulty.
Screws not tight.
Tighten all screws.
If there is significant leakage, check
to see which gasket is faulty, then
replace it.
Minor traces of oil on the crankcase
or oil drops below the compressor are
harmless. Wipe off with a lint-free rag.
Air leak between cylinder
and valve cover.
Gasket or O-ring of the liner
above the relief groove faulty.
Replace gasket or O-ring.
Oil leak at relief groove of
cylinder flange.
O-ring of the liner beneath the
relief groove faulty.
Replace O-ring.
Water in the oil Poor ventilation (compressor
is overcooled).
Correct the room ventilation.
Poor drainage. Check drain lines and drain intervals.
No isolating hose at crankcase
ventilation or isolating hose is
broken.
Replace isolating hose.
Very short compressor run
time.
Extend compressor running time.
Premature failure of valve
plates, valve springs or
valve discs.
Poor drainage. Check drain lines and drain interval.
Note: Indentation marks on the valve
plate due to valve impact are normal.
Fault Probable cause Remedy
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