631E Series II Wheel Tractor-Scrapers Caterpillar


Crankshaft Vibration Damper - Inspect

Usage:

631E 1AB
Damage to the vibration damper or failure of the vibration damper will increase torsional vibrations. These vibrations will result in damage to the crankshaft and to the other engine components. A deteriorating vibration damper will cause excessive gear train noise at variable points in the speed range.

Caterpillar recommends replacing the vibration damper for any of the following reasons:

  • The engine has had a failure because of a broken crankshaft.

  • The S·O·S analysis detected a worn crankshaft front bearing.

  • The S·O·S analysis detected a large amount of gear train wear that is not caused by a lack of oil.

The vibration damper can be used again if none of the above conditions are found or if the vibration damper is not damaged.

In the vibration damper, a wobble can occur on the outer ring. Some of the wobble of the outer ring is normal. If a wobble is present, replacement of the vibration damper may not be necessary. To confirm an acceptable wobble, see the Service Manual for the procedure to check the vibration damper.

Marks of the vibration damper are on the hub and on the outer ring. These marks will indicate the condition of the vibration damper. If the marks are not in alignment, the rubber seal between the outer ring and the hub has separated from the outer ring or from the hub. Install a new vibration damper if the marks are not in alignment.

Note: Contact your Caterpillar dealer for further information.

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