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CONDITION POSSIBLE CAUSE CORRECTION PROPELLER SHAFT VIBRATION 1. Undercoating or other foreign 1. Clean exterior of shaft and wash 2. Loose U-joint clamp screws. 2. Tighten screws properly. 3. Loose or bent U-joint yoke or 3. Install replacement yoke. 4. Incorrect drive line angularity. 4. Correct angularity 5. Rear spring center bolt not in 5. Loosen spring U-bolts and seat 6. Worn U-joint bearings. 6. Install replacement propeller 7. Propeller shaft damaged (bent 7. Install replacement propeller 8. Broken rear spring. 8. Replace rear spring. 9. Excessive runout or unbalanced 9. Reindex propeller shaft 180 10. Excessive drive pinion gear 10. Reindex propeller shaft 180 UNIVERSAL JOINT NOISE 1. U-joint clamp screws loose. 1. Tighten screws with specified 2. Lack of lubrication. 2. Replace U-joint. PROPELLER SHAFT BALANCE If propeller shaft balance is suspected, it can be verified with the following procedure. NOTE: Removing and re-indexing the propeller Clean all the foreign material from the propeller shaft and the universal joints (mud, undercoating, Inspect the propeller shaft for missing balance weights, broken welds, and bent areas. If the pro- Ensure the universal joints are not worn, are prop- erly installed, and correctly aligned with the shaft. Check the universal joint clamp screws torque. nuts to retain the brake discs. (3) Mark and number the propeller shaft tube approximately six inches from the yoke weld end at (4) Run and accelerate the vehicle until vibration occurs. Note the intensity and speed the vibration (5) Install a screw clamp at position 1 (Fig. 1). (6) Start the engine and recheck for vibration. If there is little or no change in vibration, move the (7) If there is no change in amount of vibration at other positions, the vibration may not be caused by Fig. 1 CLAMP AT POSITION 1 1 - CLAMP 3 - 2 PROPELLER SHAFT ZB PROPELLER SHAFT (Continued) |