Komatsu 830E Shop Manual page 584

4. Compare evaporator discharge air temperature
reading to see if it matches the recommended
temperature for the ambient temperature and
gauge readings obtained.
5. Carefully feel the hoses and components on the
high side. All should be warm-hot to the touch.
Check the inlet and outlet of receiver-drier for
even temperatures, if outlet is cooler than inlet, a
restriction is indicated.
Use extreme caution when placing hands on high
side components and hoses. Under certain condi-
tions these items can be extremely hot.
6. Feel the hoses and components on the low side.
They should be cool to the touch. Check connec-
tions near the expansion valve, inlet side should
be warm and cold-cool on the outlet side.
7. If these conditions are met, the system is consid-
ered normal. Shut down engine. Remove gauges
and install the caps on the service valves.
M9-28
DIAGNOSIS OF GAUGE READINGS & SYSTEM
PERFORMANCE
The following Troubleshooting Chart lists typical mal-
functions encountered in air conditioning systems. Indi-
cations and or problems may differ from one system to
the next. Read all applicable situations, service proce-
dures, and explanations to gain a full understanding of
the system malfunction. Refer to information listed
under "Suggested Corrective Action" for service proce-
dures.
Air Conditioning System
for HFC 134a Refrigerant
05/02 M09010