HINGE A.-LH 4K7680 - Caterpillar

Illustration 1 g00996583
The crankshaft vibration damper is located at the rear of the machine on the front of the engine.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 in damage to 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 oil analysis detected a worn crankshaft front bearing.
The S O S oil analysis detected a large amount of gear train wear that is not caused by a lack of oil.
The alignment marks on the hub and on the outer ring are not in alignment because the rubber seal has separatedThe vibration damper can be used again if none of the above conditions are found and the damper is not damaged.Inspect the vibration damper assembly for dents in the outer case. Dents in the outer case may cause failure of the damper assembly. Install a new vibration damper if the damper is damaged.Reference: For information on replacing the crankshaft vibration damper, refer to Disassembly and Assembly, "Vibration Damper" for the machine that is being serviced.