IT38G Integrated Toolcarrier and 938G Wheel Loader Power Train Caterpillar


Transmission Hydraulic Control Valve - Disassemble

Usage:

IT38G 1CW

Disassembly Procedure

Start By:

  1. Remove the cab. Refer to Disassembly and Assembly, SENR6798, "Cab - 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, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.


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

Hot oil and components can cause personal injury.

Do not allow hot oil or components to contact skin.

----------------------

Note: Put identification marks on all lines, on all hoses, on all wires, and on all tubes for installation purposes. Plug all lines, hoses, and tubes. This helps to prevent fluid loss and this helps to keep contaminants from entering the system.




    Illustration 1g00826198

  1. Disconnect wire connectors (1) from the transmission control valve body.

  1. Remove hex head bolts (2) that hold the transmission control valve body to the transmission.

  1. Remove transmission control valve body (3) from the transmission.



    Illustration 2g00685942

  1. Remove bolts (4), differential valve (5), and dump valve (6) from transmission control valve body (3).



    Illustration 3g00685935



    Illustration 4g00826609

  1. Remove plug (7), valve spool (5b), and spring (5a) from differential valve (5) .



    Illustration 5g00685947

  1. Remove two dowels (8), seal (9), and O-ring seal (10) from the dump valve. Inspect the seals for damage.



    Illustration 6g00685955

  1. Remove rubber seal (11) from the back side of the dump valve. Inspect the seal for damage.



    Illustration 7g00685966

  1. Turn over dump valve (6). Remove plug (12) and remove plug (15). Inspect the O-ring seals on each plug for damage. Remove spring (14) and valve spool (13) from the valve body.

  1. Remove plug (16) and plug (23). Inspect the O-ring seals on the plugs for damage. Remove spring (22), piston (21), and valve spool (19) from the dump valve.

  1. Remove plug (18). Inspect the O-ring seal on the plug for damage. Remove screen plug (20) from valve spool (19) .

  1. Remove plug (17). Inspect the O-ring seal on the plug for damage.



    Illustration 8g00685969

  1. Remove socket head bolts (24) and (25) in order to separate manifold (27) from valve body (26) .



    Illustration 9g00685974

  1. Remove spacer plate (28) from manifold (27) .



    Illustration 10g00685976

  1. Remove seal (29) and inspect seal (29). Remove two dowels (30) from manifold (27) .



    Illustration 11g00685978

  1. Turn over manifold (27) and remove seal (31) .

  1. Remove retainer ring (32) and then remove flow valve (33) .



    Illustration 12g00686054

  1. Turn over valve body (26). Remove seal (34), retainer (35), and spring (36) from the bottom of valve body (26) .



    Illustration 13g00686067

  1. Remove plugs (45), valve spool (46), and springs (38). Remove slug (47) and remove slug (39) .

  1. Remove plugs (44), spring (43), and slug (41). Remove selector valve spool (42) and remove valve spools (40) from the valve body.

  1. Remove solenoid valve assemblies (37) and (48) from the valve body.



    Illustration 14g00686083

  1. Remove the ball, the seat, and spring assembly (53) from slug (39). Remove retainer ring (49), spacer (54), and spool (55) from valve spool (42). Remove screen plug (50) from spool (55). Remove slug (51) from valve spool (42). Remove slug (52) from valve spool (42) .

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