3408E and 3412E Engines for Caterpillar Built Machines Vibration Damper - Check Caterpillar

Rubber Vibration Damper (If Equipped)

Illustration 1	g01124289
Vibration damper and pulley (1) Adapter (2) Rubber (3) Damper assembly (4) Bolt (5) Crankshaft pulley

The vibration damper is installed on the front of crankshaft. The space in the damper assembly (3) is filled with rubber (2). The vibration damper limits the torsional vibration.

Replace the damper if any of the following conditions exist:

• The damper is dented or cracked.

• The paint on the damper is discolored from heat.

• There is a large amount of gear train wear that is not caused by lack of oil.

• Analysis of the oil has revealed that the front main bearing is badly worn.

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

Viscous Vibration Damper (If Equipped)

Illustration 2	g01363868
Viscous vibration damper (6) Pulley (7) Weight (8) Case

Damage to the vibration damper or failure of the vibration damper will increase vibrations. This will result in damage to the crankshaft.

Replace the damper if any of the following conditions exist:

• The damper is dented, cracked, or fluid is leaking from the damper.

• The paint on the damper is discolored from excessive heat.

• The damper is bent.

• The bolt holes are worn or there is a loose fit for the bolts.

• The engine has had a crankshaft failure due to torsional forces.