Procedure to Adjust Track Tension with Restricted Access to Fill Valve{7050} Caterpillar

Introduction

The Special Instruction, REHS5607 is for the procedure to modify the opening to access the fill valve on the track tension cylinder. If you need more information about the modification on your machine, consult your Cat dealer.

Do not perform any procedure that is outlined in this publication without reading this article first. Do not order any parts until you understand the information that is contained in this document.

Safety Section

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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Cat dealer for replacement manuals. Proper care is your responsibility.

Required Parts

Modification Procedure

Illustration 1	g00104545

Attach a "Do Not Operate" warning tag or a similar warning tag to the start switch or to the controls before you service the equipment. These warning tags (Special Instruction, SEHS7332) are available from your Cat dealer.

Modification Procedure for the Opening to the Fill Valve Cylinder

In severe applications, accelerated wear of track joints can occur. Accelerated wear will result in an inability to properly tension the tracks due to restricted access for the fill valve on the track adjuster. To increase available adjustment range, the fill valve opening on the side of the roller frame can be enlarged by 21 mm (0.83 inch) towards the front of the roller frame. Perform the following steps.

1. Remove the front idler and track adjuster. Refer to Disassembly and Assembly, "Front Idler and Track Adjuster – Remove".

2. Discard the 158-4706 Cover .

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Illustration 2	g02158642
View of the left side of the machine. (A) 21 mm (0.83 inch) (B) 166 mm (6.54 inch) (C) 145 mm (5.71 inch) (D) 54 mm (2.13 inch) (E) R20 mm (F) Cut this area from the existing opening on the roller frame.

3. Enlarge the opening for access to the fill valve. Refer to Illustration 2 for location and dimensions of the hole.

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Illustration 3	g02158944
Section through the left side of the track frame. (G) Enlarge the opening in both outer plates for each side of the frame.

4. Ensure that the opening is enlarged in both parts of the frame. Refer to Illustration 3.

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Illustration 4	g02159067
View of the left side of the machine. (A) 186 mm (7.323 inch) (B) Ø 8.7 - A, M10 X 1.5 - 6H THD (C) 72.5 mm (2.9 inch)

5. Drill and tap a new hole for attaching the 352-6598 Cover using an 8.7 mm (0.343 inch) drill bit and a M10 x 1.5 tap. Refer to Illustration 4 for the location.

6. Reinstall the front idler and track adjuster. Refer to Disassembly and Assembly, "Front Idler and Track Adjuster – Install".

7. Install the new 352-6598 cover.