The Hydraulic Cylinders May Leak Hydraulic Fluid On Certain Excavators Caterpillar

The Hydraulic Cylinders May Leak Hydraulic Fluid On Certain Excavators

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The Hydraulic Cylinders May Leak Hydraulic Fluid On Certain Excavators

CONFIDENTIAL TIBU4340-00

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TECHNICAL INFORMATION BULLETIN	SEPTEMBER 01, 2004
EXCAVATORS	345B (6XS, 6MW, 8KW), 345B L (4SS, 5WS, 7KS, 9GS, 2SW, 8RW, 9CW), 345B L MH (2NW), 345B II (ALD, AKJ, AMN, DCW), 345B L II (ALB, AMD, AMJ, CDJ, AYR, AGS, AKX), 345B II MH (APB, DET) EXCAVATORS
	Component Code(s) 5456, 5457, 5458

SUBJECT: THE HYDRAULIC CYLINDERS MAY LEAK HYDRAULIC FLUID ON
CERTAIN EXCAVATORS

PROBLEM:

Hydraulic fluid may leak from the hydraulic cylinders for the stick, for the boom, and for the bucket. The leaks occur on the rod assembly at the head end of the hydraulic cylinder.

SOLUTION:

If hydraulic fluid leaks from the hydraulic cylinders, replace the former u-cup seals with the new u-cup seals. The new seals are made from a material that is softer than the former seals. The new seals are available in the new seal kits. The new and the former components are listed in the table. The location of the new seals is shown in Illustration 1.

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New Seals For The Hydraulic Cylinders
Qty	New Part Number	Description	Former Part Number
1	200-3525	Stick Cylinder Gp	-
1	216-0008	U-Cup Seal	087-5396
1	200-3621	Seal Kit	200-3526
2	200-3535	Boom Cylinder Gp	-
2	170-9865	U-Cup Seal	7Y-4942
2	200-3572	Seal Kit	200-3536
1	173-3541⁽¹⁾⁽³⁾ 118-3935⁽¹⁾	Bucket Cylinder Gp	- -
1	170-9865	U-Cup Seal	7Y-4942
1	215-9989	Seal Kit	204-2721
1	173-3545⁽²⁾⁽³⁾ 129-7835⁽²⁾	Bucket Cylinder Gp	- -
1	170-9865	U-Cup Seal	7Y-4942
1	215-9990	Seal Kit	204-2720

^{(1)T Bucket Family

⁽²⁾U Bucket Family

⁽³⁾Nonserviceable Item

Illustration 1. Typical Hydraulic Cylinder

(B) U-Cup Seal

(C) Backup Ring For The U-Cup Seal

COPYRIGHT 2004 CATERPILLAR

ALL RIGHTS RESERVED}

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