777G Off-Highway Truck Power Train Caterpillar


Transmission Hydraulic Control - Disassemble

Usage:

777G GT7

Disassembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
6V-5219  Bolt 
1P-1853  Pliers 

Start By:

  1. Remove the transmission hydraulic control. Refer to Disassembly and Assembly, "Transmission Hydraulic Control - Remove".


NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.

Dispose of all fluids according to local regulations and mandates.




    Illustration 1g01326000

  1. Remove sleeve (1).


    Illustration 2g01326016

  2. Remove O-ring seals (2).


    Illustration 3g01326022

  3. Place a mark onto hose assembly (3) and (4) for assembly purposes. Disconnect hose assemblies (3) and (4). Remove bolts (5). Remove relief valve (6).


    Illustration 4g01326035

  4. Remove cover (7).


    Illustration 5g01326037

  5. Remove O-ring seal (8) from cover (7).


    Illustration 6g01326046

    ------ 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.


  6. Install Tooling (A). Remove bolts (9) evenly until cover (10) touches Tooling (A). Remove bolts (9). Loosen Tooling (A) until all spring tension is released. Remove Tooling (A).


    Illustration 7g01326052

  7. Remove load piston (13), spring (12), and spool assembly (11).


    Illustration 8g01326054

  8. Remove slug (14) from spool assembly (11).


    Illustration 9g01326056

    ------ 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.


  9. Use Tooling (B) in order to remove retaining ring (18). Remove retainer (17), spring (16), and ball (15) from spool (11).


    Illustration 10g01326059

  10. Disconnect harness assembly (19). Remove cable straps (20). Remove harness assembly (19).


    Illustration 11g01326185

  11. Place a mark onto hose assembly (21) and mark the location for assembly purposes. Disconnect hose assemblies (21).

  12. Place a mark onto modulating valve (22) and mark the location for assembly purposes. Remove bolts (23). Remove modulating valve (22).

  13. Repeat Steps 11 through Step 12 for the remaining modulating valves.


    Illustration 12g01326213

  14. Remove drains (24) and (26). Remove sensor (25).


    Illustration 13g01326267

  15. Remove bolts (27). Remove plate (28).


    Illustration 14g01326281

  16. Remove relief valve (29).


    Illustration 15g01326294

    ------ 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.


  17. Remove cap (34), spring (33), spacer (32), and valve (31) from body (30).

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