Thermostatic Switch Malfunction - Komatsu 930E-2 Shop Manual

Thermostatic Switch Malfunction

Indications:
Gauge Reading- Low Side Normal
High Side Normal
The low side gauge needle may fluctu-
ate in a very narrow range compared to
a normal range.
The compressor clutch may be cycling
on and off more frequently than it should.
The low side gauge needle may fluctu-
ate in an above normal range as the
clutch cycles. This may be an indication
that the thermostat is set too high.
A new thermostat may have been in-
stalled incorrectly.
Cause- The thermostat switch is not functioning
properly or at all.
M9-26
Repair Procedure: Replace the thermostatic
switch. When removing the old thermostat, re-
place it with one of the same type. Take care in
removing and handling the thermostat and thin
capillary tube attached to it. Do not kink or
break the tube.
Position the new thermostat capillary tube at or
close to the same location and seating depth
between the evaporator coil fins as the old one.
Connect the electrical leads.
Air Conditioning System
for HFC 134a Refrigerant
M09010 6/97