Komatsu PC88MR-10 Shop Manual page 1402

80 Appendix
Troubleshooting with gauge pressure
Indicated gauge pressure
<Pressure of high-
pressure line is too high
and that of low-pressure
line is too low>
<Pressure of high-
pressure line is too low
and that of low-pressure
line is too high>
*1: If refrigerant leaks, compressor oil in the air conditioner circuit always leaks, too. So perform the check
mainly on pipe joints and dirty parts with oil.
*2:
When replacing cooling cycle parts, be sure to collect refrigerant. For details, see "Precautions for
refrigerant". After replacing parts, fill the air conditioner circuit with refrigerant.
*3: Sight glass is on the air conditioner hose near the condenser.
80-78
Cause
Piping between
compressor and
condenser is Clogged or
crushed.
Defective compressor
(compression trouble of
compressor)
Check method
Remarkable temperature
difference is recognized
across clogged part.
Pressures of high-
pressure and low-
pressure lines are almost
the same while
compressor is running.
Compressor has seized
and is extremely hot.
Remedy
Clean inside of cooling
cycle parts or replace
them.*2
Replace *2
PC88MR-10