793C Off-Highway Truck Machine Systems Caterpillar

Disassembly Procedure

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1. Remove the front suspension. Refer to Disassembly and Assembly, "Front Suspension (Cylinder) - Remove" for the correct procedure.

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In order to prevent possible personal injury, remove the nitrogen charge before the disassembly of the front suspension cylinder.

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Illustration 1	g00485034

1. Position the front suspension on a level surface so the axis of the cylinder is horizontal.

2. Remove 24 bolts (4) and the 24 washers. Remove head (1) from housing assembly (2). The weight of head (1) is approximately 136 kg (299.8 lb). The housing assembly weighs approximately 435 kg (959.01 lb).

3. Plate (3) and two plates (5) will not be removed unless the cylinder assembly must be replaced and new plates were not ordered.
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   In order to prevent possible personal injury, use a suitable fixture to support the weight of the suspension cylinder. Do not attempt to stand the suspension cylinder on end without the use of a suitable support. Failure to use a suitable support fixture could result in injury or death to personnel in this area.

4. Use Tool (A), Tool (B), and a suitable hoist to position the front suspension so the axis of the cylinder is vertical. Use a suitable fixture to support the weight of the front suspension.

   Note: New tools are available (C) (D) to allow horizontal removal of the gland.

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   Illustration 2	g00485261

5. Remove rod assembly (7) from housing assembly (2). Place rod assembly (7) on a level surface. Support rod assembly (7) with blocking. Rod assembly (7) weighs approximately 801 kg (1765.9 lb).

   Note: Protect all the surfaces of the components with tape.

6. Remove wear ring (8) from piston (6).
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   Illustration 3	g00485262

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   Illustration 4	g00485268

7. Remove 16 bolts (9) and the 16 washers. Move piston (6) forward to remove ball (10). Remove piston (6) from rod (7). Piston (6) weighs approximately 72 kg (158.7 lb).
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   Illustration 5	g00485307

8. Use Tool (A) and a suitable hoist to remove gland (12) from housing assembly (2). Gland (12) weighs approximately 24.4 kg (53.79 lb).

9. Remove seal (11) from gland (12).

10. Remove wear ring (13) from gland (12).

11. Remove two seals (14) and four rings (15) from gland (12).
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    Illustration 6	g00485269

12. Use a 4.5 kg (9.92 lb) rubber mallet to unseat end assembly (16). Remove three-piece retainer (17) from rod (7).

13. Remove three-piece retainer (17) from the slot in rod (7).

14. Pull end assembly (16) from rod (7). Use the threaded hole in end assembly (16) for the removal. End assembly (16) weighs approximately 13 kg (28.7 lb).
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    Illustration 7	g00485271

15. Remove seal (18) from end assembly (16).
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    Illustration 8	g00485272

16. Use Tool (B) and a suitable hoist to place the housing assembly on a level surface. Support the housing assembly with blocking.

17. Remove seal (19) from housing assembly (2).

18. Remove seal (20) from housing assembly (2).
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    Illustration 9	g00485274

19. Remove wear ring (21) from housing assembly (2).
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    Illustration 10	g00485276

20. Remove plug (22) and fitting (23) from the housing assembly.

21. Remove two fittings (24) (not shown) on the opposite side of the housing assembly.
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    Illustration 11	g00485309

22. Remove seal assembly (25) from head (1).