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 187 of 926

TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
22.
STARTER MOTOR IS NOISY AND ENGAGEMENT IS ERRATIC.
Replace starter motor (para 3-72).
23.
RETARDER NOT WORKING IN ONE OR TWO SELECTOR POSITIONS.
NOTE
*Ignition switch must be in ON position, engine retarder foot switch must be pressed, and throttle must be
in idle position when doing the following checks.
*Do steps 1 thru 4 if low range is not working.
· Do step 1 and steps 5 thru 7 if medium range is not working.
*Do step 8 if high range is not working.
· Do step 1 and steps 5 thru 7 if medium and high range are not working.
1
Check for voltage at
12 volts dc
Go to step 2
Reset circuit
circuit 52F-GY terminal
nominal
breaker CB-2
of engine retarder
and/or trouble-
switch
shoot CB-2 cir-
cuit (Refer
to malfunction
33).
2
Set engine retarder
switch to LOW range.
(Refer to TM 9-2320-
283-10) Go to
step 3.
3
Check for voltage at
12 volts dc
Go to step 3
Replace switch
circuit 52G-LG terminal
nominal
(para 3-88).
of engine retarder
switch.
2-62


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