TM-9-2320-283-34-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1983
TM-9-2320-283-34-1 - Page 53 of 624
TM 9-2320-283-34-1
TROUBLESHOOTING
2-7.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
17.
EXCESSIVE NOISE.
Step 1.
Check pinion bearings for wear or damage.
Replace or repair axle carrier (para 3-69 and para 3-70 for forward-rear, para 3-75 and para 3-76 for
rear-rear).
Step 2.
Check side carrier bearings for wear or damage.
Replace or repair axle carrier (para 3-69 and para 3-70 for forward-rear, para 3-75 and para 3-76 for
rear-rear).
Step 3.
Check ring and pinion gears for wear or damage.
Replace or repair axle carrier (para 3-69 and para 3-70 for forward-rear, para 3-75 and para 3-76 for
rear-rear).
Step 4.
Check spider and side gears for wear or damage (rear-rear axle).
Replace or repair axle carrier (para 3-75 and para 3-76 for rear-rear).
Step 5.
Check differential carrier cover bearings and gears for wear or damage.
Replace or repair differential carrier cover (para 3-67 and para 3-68).
18.
LOCKOUT WILL NOT ENGAGE.
Step 1.
Check differential lockout for air leaks or damage.
Replace or repair differential lockout (para 3-71).
Step 2.
Check differential carrier cover for stuck or damaged shift fork or clutch.
Replace or repair differential carrier cover (para 3-67 and para 3-68).
2-9
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