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 191 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
24.
NO RETARDING ACTION.
1.
Remove circuit breaker
bracket far enough to
access circuit breaker
CB-2 (para 3-114), and
go to step 2.
NOTE
Ignition switch must be in ON position, battery power connected, and engine retarder foot switch pressed
with throttle in idle position when doing the following checks.
2
Check for voltage at
12 volts dc
Install cir-
Reset circuit
circuit 52-LB terminal
nominal
cult breaker
breaker CB-2
of circuit breaker
bracket (para
and/or trouble-
CB-2
3-114), and go
shoot CB-2
to step 3
circuit
(Refer
to malfunction
33).
3
Check for voltage at
12 volts dc
Go to step 4
Repair circuit
circuit 52A-LB terminal
nominal
52A-LB and/or
of foot switch
52-LB (para
4
Check for voltage at
12 volts dc
Go to step 5
Replace foot
circuit 52B-WH
nominal
switch (para
terminal of foot
3-89).
switch.
5
Disconnect circuit
52B-WH from 52C-WH at
connector, and go to
step 6.
6
Check for voltage at
12 volts dc
Connect cir-
Repair circuit
circuit 52B-WH (pin M
nominal
cults 52B-WH to
52B-WH (para
of connector)
52C-WH, and go
3-127).
to step 7.
2-66
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