TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
8.
OIL TEMPERATURE LIGHT DOES NOT OPERATE PROPERLY (MODEL A ONLY)
(continued).
3.
TEST OPTIONS
KNOWN INFO
Oil Temperature Switch
Oil temperature light
Is there continuity
Test.
never comes on.
measured across
Oil temperature bulb OK.
the oil temperature
REASON FOR QUESTION
switch terminals
POSSIBLE PROBLEMS
when the switch is
The oil temperature switch
heated over 200F
closes at 200 F (93 C) to
Oil temperature switch
(93C)?
turn on the oil temperature
faulty.
light and opens at 180 F
Cab control box circuit
(82 C) to turn off the light.
board faulty.
The switch is defective if
Linking harness faulty.
the switch is open above
Main junction box
this temperature.
harness faulty.
Oil temperature switch
harness faulty.
Replace oil
NO
temperature switch
YES
4-136
Change 1
