793D Off-Highway Truck Machine Systems Service and Parking Brake (Front) - Disassemble Caterpillar


Service and Parking Brake (Front) - Disassemble
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1.1. Disassembly Procedure

Disassembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
138-7576  Link Bracket 
(3/8 - 16) NC by 4 inch
Forcing Bolt 
4C-8358  Eyebolt 
FT-0841  Spring Compressor 

Start By:

  1. Remove the front service and parking brake. Refer to Disassembly and Assembly, "Service and Parking Brake (Front) - Remove".


    Illustration 1g01423467

    ------ WARNING! ------

    Personal injury can result from being struck by parts propelled by a released spring force.

    Make sure to wear all necessary protective equipment.

    Follow the recommended procedure and use all recommended tooling to release the spring force.


  1. Remove bolts (1). Loosen nuts (2) by one half turn at a time until the spring tension has been released.

  2. Remove nuts (2).


    Illustration 2g01423480

  3. Use Tooling (A) in order to remove plate (3). The weight of plate (3) is approximately 113 kg (250 lb).


    Illustration 3g01423533

  4. Remove damper assembly (4).


    Illustration 4g01423537

  5. Remove plates (5) and discs (6).

    Note: Note the quantity and the order of plates (5) and discs (6) for installation purposes.



    Illustration 5g01423542

  6. Remove damper assembly (7).


    Illustration 6g01423566

  7. Use a suitable pry bar in order to raise brake hub (8). Install suitable blocking and attach a suitable lifting device onto brake hub (8). The weight of brake hub (8) is approximately 68 kg (150 lb). Remove brake hub (8).


    Illustration 7g01423659

  8. Install Tooling (B) into piston (9). Tighten Tooling (B) evenly in order to compress the guide springs.


    Illustration 8g01423675

  9. Install pin (10) into guide (11). Repeat this step for the remaining guides (11).

  10. Remove Tooling (B).


    Illustration 9g01423682

  11. Press down piston (9). Remove pin (12) from guide (11).


    Illustration 10g01423689

  12. Use Tooling (C) and a suitable lifting device in order to remove piston (9). The weight of piston (9) is approximately 86 kg (190 lb).


    Illustration 11g01423817

  13. Remove the outer seal rings and the inner seal rings (13). Remove the outer seal rings and the inner seal rings (14) from piston (9).


    Illustration 12g01423822

    ------ WARNING! ------

    Personal injury can result from being struck by parts propelled by a released spring force.

    Make sure to wear all necessary protective equipment.

    Follow the recommended procedure and use all recommended tooling to release the spring force.


  14. Loosen nuts (15) by one-half turn at a time until the spring tension has been released.

  15. Remove nuts (15).


    Illustration 13g01423826

  16. Use Tooling (C) and a suitable lifting device in order to remove piston (16) and housing (17). The weight of piston (16) and housing (17) is approximately 132 kg (291 lb).

  17. Separate housing (17) from piston (16).


    Illustration 14g01423830

  18. Remove the outer seal rings and the inner seal rings (18). Remove the outer seal rings and the inner seal rings (19) from housing (17).


    Illustration 15g01423843

  19. Remove seals (20) from housing (17).


    Illustration 16g01423853

    ------ WARNING! ------

    Personal injury can result from being struck by parts propelled by a released spring force.

    Make sure to wear all necessary protective equipment.

    Follow the recommended procedure and use all recommended tooling to release the spring force.


  20. Use Tooling (D) in order to compress guide spring (21). Remove pin (10), guide (11), and guide spring (21) from piston (16). Repeat this step for the remaining pins (10), guides (11), and guide springs (21).


    Illustration 17g01423869

  21. Note the location of the springs that are marked with an X. Remove springs (21) and inner springs (22) from anchor (23).


    Illustration 18g01423880

  22. Remove O-ring seal (24). Remove studs (25) and studs (26), if necessary.


    Illustration 19g01423885

  23. Remove purge screw (27) and the adapter.

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793D Off-Highway Truck Machine Systems Service and Parking Brake (Front) - Install
793D Off-Highway Truck Machine Systems Service and Parking Brake (Front) - Remove
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