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 193 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
24.
NO RETARDING ACTION (Continued).
7
Disconnect circuit
52C-WH from 52D-WH at
connector, and go to
step 8.
8
Check for voltage at
12 volts dc
Connect cir-
Repair circuit
circuit 52C-WH (pin
nominal
cuit 52C-WH to
52C-WH (para
13 of connector)
52D-WH, and go
3-127).
to step 9.
9
Check for voltage at
12-volts dc
Go to step 10
Repair circuit
circuit 52D-WH ter-
nominal
52D-WH (para
minal of throttle
3-127).
switch.
10
Check for voltage at
12-volts dc
Go to step 11
Repair throttle
circuit 52E-GY ter-
nominal
switch (para
minal of engine
3-90).
retarder switch.
11
Check for voltage at
12 volts dc
Go to step 12
Replace circuit
circuit 52F-GY ter-
nominal
52F-GY and/or
minal of engine
52E-GY (para
retarder switch
3-127).
12
Set engine retarder
switch to HIGH range.
(Refer to TM 9-2320-
283-10) Go to
step 13.
13
Check for voltage at
12 volts dc
Notify direct
Replace engine
circuit 52G-LG ter-
nominal
support main-
retarder switch
minal of engine
tenance
(para 3-89).
retarder switch.
2-68
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