TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 203 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
27.
LOW ENGINE OIL INDICATOR NOT WORKING (Continued).
NOTE
With positive lead on circuit 44K-LB, check ground with negative lead.
*The following checks should be made with the engine shut off.
8
Check for voltage at
12-volts dc
Go to step 9
Replace switch
circuit 54A-YL ter-
nominal
(para 3-104).
minal of oil pressure
sending unit.
9
Check for voltage at
12-volts dc
Replace bulb
Repair cir-
circuit 54-YL ter-
nominal
(para 3-87),
cults 54-YL
minal of low oil
and go to step
and/or 54A-YL
pressure indicator
10
(para 3-127).
lamp socket.
10
Start engine and
15-45 psi
Go to step 11
Stop engine.
monitor oil pressure
Replace oil
gage
pressure gage
(para 3-73).
11
Start engine
Indicator
Low oil pres-
Replace low oil
lamp turns
sure indicator
pressure send-
off
lamp circuit
ing unit (para
OK Go to step
3-104).
12.
12
With engine running
Indicator
Replace low
Low oil pres-
oil pressure indica-
lamp lights
oil pressure
sure indicator
tor should remain
irratically
sending unit
lamp system
OK.
off
(para 3- 104).
2-78
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