TM-9-2320-209-34-2-3
2½-TON, 6X6, M44A1 AND M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; MAINTENANCE; DIRECT SUPPORT AND GENERAL SUPPORT LEVEL; VOLUME 2 OF 2; PART 3 OF 3
MAY 1981
TM-9-2320-209-34-2-3 - Page 369 of 592
TM 9-2320-209-34-2-3
(3) Overheat thermostat, restriction thermostat, diode and electrical leads.
FRAME 1
CAUTION
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Rough handling of thermostats can cause them not to
work right.
Clean overheat thermostat (1), restriction thermostat (2), and diode (3) with
clean cloth.
Inspect overheat thermostat (1), restriction thermostat (2), and diode (3)
for corrosion. If they are corroded, get new parts.
If overheat thermostat (1) or restriction thermostat (2) are known not to be
working right, like the heater overheating, get new ones.
NOTE
Thermostats and diode are not able to be fixed. If they
do not pass tests, get new ones.
Place leads of ohmmeter on each terminal (4 and 5) of overheat thermostat (1).
Circuit should be closed.
Place one lead of ohmmeter on overheat thermostat case (1). Place other lead
on terminal (4 or 5). Circuit should be open.
Get new overheat thermostat (1) if it does not pass tests in steps 4 and 5.
Do steps 4, 5 and 6 again for terminals (6 and 7) of restriction thermostat (2).
Place leads of ohmmeter on ends of diode (3). Note if circuit is open or
closed.
Switch leads on ends of diode. Note if circuit is open or closed.
Circuit must be closed in one test and open in the other. If circuit is open
or closed in both directions, diode must be replaced.
Inspect electrical leads (8 and 9) for broken or worn insulation and broken
terminals.
Inspect ground strap (10) for broken terminals.
Check continuity through electrical leads (8 and 9) and ground strap using
an ohmmeter.
Place an ohmmeter lead on each terminal of each lead. Get
new electrical leads (8 and 9) or ground strap (10) if circuit is open.
END OF TASK
21-34
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