Table 2-1. Mechanical Troubleshooting
TEST OR inspection
EXCESSIVE NOISE WHILE TURNING
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
Remove and inspect differential drive pinion bearings. (See paragraph 6-7, 6-9, or
Replace bearings if damaged,
KLUNKING SOUND DURING INITIAL ACCELERATION
Remove and inspect front axle shaft universal
Replace any damaged universal joints.
joint. (See paragraph 6-4)
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.
WHINE IN ONE SPEED RANGE
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.
WHINE IN ALL SPEED RANGES
Remove appropriate differential cover, (See paragraph 6-5, 6-8, or 6-15) Inspect
ring gear and drive pinion for damage.
Replace if damaged.