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 189 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

23.

RETARDER NOT WORKING IN ONE OR TWO SELECTOR POSITIONS (Continued).

4

Check for voltage at

12 volts dc

Notify direct

Repair circuit

circuit 52H-LG terminal

nominal

support main-

52H-LG and/or

of engine retarder

tenance

52G-LG (para

solenoid

3-127).

5

Set engine retarder

switch to MED range.

(Refer to TM 9-2320-

283-10) Go to step

6.

6

Check for voltage at

12 volts dc

Go to step 8

Replace switch

circuit 52J-PK terminal

nominal

(para 3-88).

of engine retarder

switch.

7

Check for voltage at

12 volts dc

Notify direct

Repair circuit

circuit 52K-PK terminal

nominal

support main-

52K-PK and/or

of engine retarder

tenance

52J-PK (para

solenoid

3-127).

8

Check for voltage at

12 volts dc

Notify direct

Repair circuit

circuit 52K-PK terminal

nominal

support main-

52K-PK (para

of engine retarder

tenance

3-127).

switch.

2-64