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 432 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
113.
NO SERVICE BRAKES ON TRAILER ONLY.
Step 1.
Check service air hose connection and position of trailer supply valve.
Reconnect hose properly and open trailer supply valve.
Step 2.
Check trailer supply valve for damage or leakage using a soap solution.
Replace defective valve (para 3-175).
Step 3.
Check double check valve(s) for damage or leakage using a soap solution.
Replace defective valve(s) (para 3-182, 3-183, 3-185, and 3-193).
114.
TRAILER HAND CONTROL WILL NOT APPLY TRAILER SERVICE BRAKES.
Step 1.
Check air lines between trailer hand control and double check valve for leakage using a soap solution.
Repair leaks.
Step 2.
Check tractor protection valve for damage or leaks using a soap solution.
Tighten connections or replace valve (para 3-192).
Step 3.
Check double check valve for damage or leaks using a soap solution.
Tighten connections or replace valve (para 3-183).
2-306
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