The Strength Of The Rod Assembly Is Increased For The Boom Cylinder And The Stick Cylinder On Certain Excavtors Caterpillar

The Strength Of The Rod Assembly Is Increased For The Boom Cylinder And The Stick Cylinder On Certain Excavtors

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The Strength Of The Rod Assembly Is Increased For The Boom Cylinder And The Stick Cylinder On Certain Excavtors

CONFIDENTIAL TIBU4342-00

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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, AKJ1-194, AMN1-334, DCW), 345B L II (ALB, AMD1-345, AMJ1-181, CDJ, AYR1-254, AGS, AKX1-278), 345B II MH (APB, DET) EXCAVATORS
	Component Code(s) 5456, 5458

SUBJECT: THE STRENGTH OF THE ROD ASSEMBLY IS INCREASED FOR THE BOOM
CYLINDER AND THE STICK CYLINDER ON CERTAIN EXCAVATORS

PROBLEM:

The size of the fillet radius concentrated the stress in the rod assemblies for the boom cylinder and for the stick cylinder. The concentrated stress decreased the strength of the rod assemblies.

SOLUTION:

If the rod assembly fails, replace the former rod assembly with the new rod assembly. The size of the fillet radius is increased for new rod assemblies. The increased fillet radius eliminates the concentrated stress and increases the strength of the new rod assemblies. The new rod assemblies are listed in the table. The locations of the increased fillet radius are shown in the illustrations.

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Improved Rod Assemblies In The Hydraulic Cylinders
Cylinder Gp	Qty	New Part Number	Description	Former Part Number
Boom	1	200-3537	Rod Assembly	129-7885
Stick	1	200-3527	Rod Assembly	129-7898

Illustration 1. 200-3537 Rod Assembly
(A) Combined Radii Increased To 8.0 mm (0.32 inch) And
2.0 mm (0.08 inch)

Illustration 2. 200-3527 Rod Assembly
(A) Combined Radii Increased To 8.0 mm (0.32 inch) And
2.0 mm (0.08 inch)

COPYRIGHT 2004 CATERPILLAR
ALL RIGHTS RESERVED

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