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 444 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
125.
INTERAXLE DIFFERENTIAL LOCKOUT NOT WORKING (Continued).
Step 2.
Disconnect air lines at rear axle; then engage lockout control valve on instrument panel.
Check for
air
pressure
at rear axle.
No air indicates clogged lines or defective lockout control valve.
a. Replace clogged lines (para 3-163).
b. Replace defective control valve (para 3-195).
c. If air controls are working normally, notify direct support maintenance.
WHEELS
126.
TIRES WEARING UNEVENLY.
Step 1.
Refer to malfunction 105.
Step 2.
Check wheel bearings for adjustment, lubrication, and damage.
Adjust bearings (para 3-204 or 3-207).
127.
NOISY OR BUMPING SOUND WHILE TRAVELING ON ROAD.
Step 1.
Check lug wheel stud capnuts for proper torque.
Torque lug nuts to 350 lb-ft.
Step 2.
Inspect U-bolts for tightness.
Torque U-bolts to 125-165 lb-ft.
Step 3.
Inspect spring shackle pins for looseness using a pry bar.
No noticeable movement is allowable.
Refer to direct support maintenance.
2-318
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