CONTROL GP-JOYSTICK 3768851 - Caterpillar

Visconic Damper
The visconic damper has a weight that is located inside a fluid filled case. The weight moves in the case in order to limit torsional vibration.Inspect the damper for evidence of fluid leaks. If a fluid leak is found, determine the type of fluid. The fluid in the damper is silicone. Silicone has the following characteristics: transparent, viscous, smooth and adhesive.If the fluid leak is oil, inspect the crankshaft seals for leaks. If a leak is observed, replace the crankshaft seals.Inspect the damper and repair or replace the damper for any of the following reasons:
The damper is dented, cracked, or leaking.
The paint on the damper is discolored from heat.
The engine has had a failure because of a broken crankshaft.
Analysis of the oil has revealed that the front main bearing is badly worn.
There is a large amount of gear train wear that is not caused by a lack of oil.Refer to the Service Manual or consult your Caterpillar dealer for information about damper replacement.