EXCESSIVE NOISE OR VIBRATION IN PROPELLER SHAFT

TM 9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

54. EXCESSIVE NOISE OR VIBRATION IN PROPELLER SHAFT.

Check bearing caps (1) for looseness.

Step 1.

If bearing caps are loose, tighten.

Check U-joints (2) and propeller shaft (3) for insufficient lubrication, exces-

Step 2.

sive wear, or damage (page 4-1).

a. If U-joints are dry, lubricate (LO 9-2320-270-12). If excessive

wear or damage is found, replace (page 4-574).

b. If excessive noise or vibration is still present, notify direct support

maintenance.

TA239712

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