EBS00155 DRIVE TRAIN TROUBLESHOOTING The following conditions may indicate damaged shaft drive components: NOTE: _ Areas A, B, and C above may be extremely difficult to diagnose. The symptoms are quite subtle and difficult to distinguish from normal vehicle operating noise. If there is reason to believe these compo- nents are damaged, remove the components and check them. EBS00156 CHECKING NOISES 1. Investigate any unusual noises. MMM M M MMM M M MMM M M MMM M M MMM M M MMM M MMM a. A “rolling rumble” noise during coasting, acceleration, or deceleration. The noise increases with front and/or rear wheel speed, but it does not increase with higher engine or transmission speeds. Diagnosis:
Possible wheel bearing damage. b. A “whining” noise that varies with accelera- tion and deceleration. Diagnosis: Possible incorrect reassembly, too-little gear lash. _ Too little gear lash is extremely destructive to the gear teeth. If a test ride following reassembly indicates this condition, stop riding immediately to minimize gear dam- age. CAUTION: 7 - 1 TROUBLESHOOTING DRIV DRIV Symptoms Possible Causes 1. A pronounced hesitation or “jerky” move- ment during acceleration, deceleration or sustained speed. (This must not be con- fused with engine surging or transmission characteristics.) 2.
A “rolling rumble” noticeable at low speed; a high-pitched whine; a “clunk” from a shaft drive component or area. 3. A locked-up condition of the shaft drive train mechanism, no power transmitted from the engine to the front and/or rear wheel. A. Bearing damage. B. Improper gear lash. C. Gear tooth damage. D. Broken drive shaft. E. Broken gear teeth. F. Seizure due to lack of lubrication. G. Small foreign objects lodged between the moving parts.