D7E Track-Type Tractor Power Train Recoil Cylinder - Disassemble Caterpillar

Disassembly Procedure

Start By:

1. Remove the track adjuster and the recoil cylinder.

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High pressure cylinder. Parts can separate with explosive force if proper care is not used during disassembly. This can cause injury or death. Do not disassemble any part of this cylinder until you have read and understand the instructions given in the service manual. Observe the instructions given in the service manual.

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Illustration 1	g03483240

1. Secure cylinder (1) to the hydraulic repair bench.

2. Remove bolts (2) and guard (3) .

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Illustration 2	g03483316

3. Attach Tooling (A) to valve (4) . Slowly vent the nitrogen from the cylinder, until all pressure is released. Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" for further information.

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Illustration 3	g03483261

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Illustration 4	g03500319

4. After all the pressure is released from the recoil cylinder, remove valve (4) from manifold (5) .

5. Remove bolts (7) , bolts (8) , manifold (5) , and spring pin (6) .

   Note: Cylinder groups that do not include spring pin (6) or holes for spring pin (6) Refer to Special Instruction, REHS8537, "Installation Procedure for Installing Spring Pins in the Recoil Cylinder of Certain D7E Track-Type Tractors".

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Illustration 5	g03512697

6. Secure cylinder (1) to the hydraulic repair bench. Use Tooling (B) and the hydraulic repair bench to remove head assembly (9) from cylinder (1) .

   Note: Some oil will drain during this step.

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Illustration 6	g03501036

7. Remove O-ring seal (10) , O-ring seal (12) , and backup ring (11) from head assembly (9) .

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Illustration 7	g03501166

8. Remove plug (13) from cylinder (1) .

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Illustration 8	g03501175

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Illustration 9	g03501201

9. Reorient and secure cylinder (1) to the hydraulic repair bench.

10. Use Tooling (D) and the hydraulic repair bench to push the rod assembly until spacer (14) can be removed.

    Note: To prevent damage to cylinder (1) wrap Tooling (D) with padding (as shown).

11. Remove spacer (14) from the cylinder.

12. Remove O-ring seals (15) from spacer (14) .

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Illustration 10	g03501156

13. Remove rod assembly (16) and piston assembly (17) from cylinder (1) .

14. Inspect Cylinder (1) for any internal damage. Refer to Specifications, "Recoil Cylinder" for more information.

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Illustration 11	g03501560

15. Secure rod assembly (16) , piston assembly (17) , and Tooling (E) to the hydraulic repair bench.

16. Remove spring pin (18) from between rod assembly (16) and piston assembly (17) .

    Note: Cylinder groups that did not include a spring pin or setscrew (18) or had a spring pin previously installed Refer to Special Instruction, REHS8537, "Installation Procedure for Installing Spring Pins in the Recoil Cylinder of Certain D7E Track-Type Tractors".

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Illustration 12	g03501568

17. Use Tooling (F) and the hydraulic repair bench to remove piston assembly (17) while holding the rod assembly with Tooling (E) .

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Illustration 13	g03502309

18. Remove O-ring seal (19) and backup ring (20) from piston assembly (17) .

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Illustration 14	g03502332

19. Remove wear band (21) , energized wear ring assembly (22) , backup rings (23) , T seal (24) , and wear band (25) from piston (17) .

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Illustration 15	g03502403

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Illustration 16	g03502502

20. Use Tooling (F) and the hydraulic repair bench to remove cap assembly (26) from cylinder (1) .

    Note: Remove only if replacing cap assembly (26) . The seals can be replaced without removing cap assembly (26) .

21. Remove scraper seal (27) , backup rings (29) , and O-ring seal (28) from cap assembly (26) .