Table 2-1. Mechanical Troubleshooting
TM 9-2320-289-34
(Con’t)
MALFUNCTION
TEST OR inspection
Corrective ACTION
5.
EXCESSIVE NOISE WHILE TURNING
Step 1.
Listen for excessive axlie noise while driving straight.
if axle noise is normal, inspect differential side gears and drive pinions for
damage. (See paragraphs 6-6, 6-7, 6-8, 6-9, 6-15, 6-16, and 6-17)
If axle noise is excessive, and noise increases while turning: remove, clean,
and inspect wheel bearings (see TM 9-2320-289-20) and side bearings (see
paragraphs 6-6, 6-8, 6-15, and 6-16).
6. CONTINUOUS LOW-PITCHED “ WHIRRING” OR SCRAPING SOUND
Step 1.
Remove and inspect differential drive pinion bearings. (See paragraph 6-7, 6-9, or
6-17)
Replace bearings if damaged,
7.
“KLUNKING” SOUND DURING INITIAL ACCELERATION
Step 1,
Remove and inspect front axle shaft universal
Replace any damaged universal joints.
joint. (See paragraph 6-4)
Step 2.
Remove pinion shaft from differential assembly. (See paragraph 6-6, 6-8, or 6-16)
Inspect pinion shaft for damage.
Replace pinion shaft if damaged.
6.
WHINE IN ONE SPEED RANGE
Step 1.
Remove appropriate differential cover. (See paragraph 6-5, 6-8, or 6-15) Inspect
ring gear and drive pinion for proper gear tooth contact pattern.
Adjust gear tooth contact pattern if it is not correct.
9.
WHINE IN ALL SPEED RANGES
Step 1.
Remove appropriate differential cover, (See paragraph 6-5, 6-8, or 6-15) Inspect
ring gear and drive pinion for damage.
Replace if damaged.
2-13
