Tilt Cylinder Dump Noise Caterpillar

Tilt Cylinder Dump Noise

Usage:

Tilt Cylinder Dump Noise

CONFIDENTIAL TIBU3683

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TECHNICAL INFORMATION BULLETIN	August 28, 2002
WHEEL LOADERS	990 II (4FR1-Up, BCR1-135)
	Component Code: 5104

SUBJECT: TILT CYLINDER DUMP NOISE

PROBLEM: At full extension of the tilt cylinder, the piston blocks the head oil passage for the rod end of the cylinder. This restricts flow to retract the rod and reduces the pressure contact area of the piston. As rod retraction (dump) is initiated, the abrupt change in flow restriction and pressure contact area can cause a hydraulic shock and noise. This may be more noticeable on high lift machines.

SOLUTION:

Machine the inside face of the tilt cylinder head down from its existing diameter of 264.0 +/- .5 mm (A) to 220.0 +/- .5 mm (B). Oil flow is improved at this smaller diameter. The cored passage letting the oil into the cylinder remains partially open and the initial pressure contact area on the piston face is increased. Production changes are in process for the 145-9900 Head to incorporate this same inside face profile into new cylinder groups.

COPYRIGHT 2002 CATERPILLAR

ALL RIGHTS RESERVED

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