M318C and M322C Excavators Machine Systems Caterpillar


Main Control Valve - Assemble

Usage:

M318C BCZ

Assembly Procedure

Note: Cleanliness is an important factor. Before assembly, thoroughly clean all parts in cleaning fluid. Allow the parts to air dry. Do not use wiping cloths or rags to dry parts. Lint may be deposited on the parts which may cause trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. Dirt and other contaminants can damage the precision component. Perform assembly procedures on a clean work surface. Keep components covered and protected at all times.




    Illustration 1g01172832



    Illustration 2g01172833



    Illustration 3g01172837

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

    Improper assembly of parts that are spring loaded can cause bodily injury.

    To prevent possible injury, follow the established assembly procedure and wear protective equipment.

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

  1. Install the O-ring seal onto cap (56). Install spool (61), spring (60), and cap (56). Tighten cap (56) to a torque of 300 N·m (221 lb ft).

  1. Install fitting (59) .

  1. Install spool (57) .

  1. Position spring (58) .

  1. Install the O-ring seal and cap (55). Tighten cap (55) to a torque of 300 N·m (221 lb ft).



    Illustration 4g01172831



    Illustration 5g01172830

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

    Improper assembly of parts that are spring loaded can cause bodily injury.

    To prevent possible injury, follow the established assembly procedure and wear protective equipment.

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

  1. Position cone (53) and spring (54) .

  1. Install plug (52). Tighten plug (52) to a torque of 150 N·m (111 lb ft).

  1. Repeat Steps 6 trough 7 for the remaining plugs (52) .



    Illustration 6g01172750

  1. Install valve (51). Tighten valve (51) to a torque of 25 N·m (18 lb ft).



    Illustration 7g01172748

  1. Install valve (50) .

  1. Install valve spools (49) .



    Illustration 8g01172745



    Illustration 9g01172744

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

    Improper assembly of parts that are spring loaded can cause bodily injury.

    To prevent possible injury, follow the established assembly procedure and wear protective equipment.

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

  1. Install the O-ring seal and valve (47). Tighten valve (47) to a torque of 20 N·m (15 lb ft).

  1. Install valve (46). Tighten valve (46) to a torque of 120 N·m (89 lb ft).

  1. Install O-ring seal (45) .

  1. Install nut (48) .

  1. Position seat (44), spring (43), and actuator cover (42) .

  1. Install bolts (41). Tighten bolts (41) to a torque of 10.4 N·m (92 lb in).



    Illustration 10g01172747

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

    Improper assembly of parts that are spring loaded can cause bodily injury.

    To prevent possible injury, follow the established assembly procedure and wear protective equipment.

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

  1. Install the remaining actuator covers (42), the O-ring seals, and valves (46) .



    Illustration 11g01172699



    Illustration 12g01172698

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

    Improper assembly of parts that are spring loaded can cause bodily injury.

    To prevent possible injury, follow the established assembly procedure and wear protective equipment.

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

  1. Install the O-ring seal and fitting (36) .

  1. Install the O-ring seals and plugs (38). Tighten plugs (38) to a torque of 45 N·m (33 lb ft).

  1. Position cone (40) and spring (39) .

  1. Install the O-ring seal and plug (37). Tighten plug (37) to a torque of 120 N·m (89 lb ft).

  1. Install solenoid (35). Tighten solenoid (35) to a torque of 12 ± 5 N·m (9 ± 4 lb ft).



    Illustration 13g01172689

  1. Install the O-ring seal and fitting (32) .

  1. Install the O-ring seal and plugs (31). Tighten plugs (31) to a torque of 45 N·m (33 lb ft).

  1. Position valve (33) .

  1. Install bolts (34). Tighten bolts (34) to a torque of 4.5 N·m (40 lb in).



    Illustration 14g01172687



    Illustration 15g01172686

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

    Improper assembly of parts that are spring loaded can cause bodily injury.

    To prevent possible injury, follow the established assembly procedure and wear protective equipment.

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

  1. Install the O-ring seal and valves (24). Tighten valves (24) to a torque of 80 N·m (59 lb ft).

  1. Position piston (29) and spring (30) .

  1. Install the O-ring seal and plug (25). Tighten plug (25) to a torque of 45 N·m (33 lb ft).

  1. Position spool (27) and spring (28) .

  1. Install the O-ring seal and plug (26). Tighten plug (26) to a torque of 90 N·m (66 lb ft).



    Illustration 16g01172685



    Illustration 17g01172684

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

    Improper assembly of parts that are spring loaded can cause bodily injury.

    To prevent possible injury, follow the established assembly procedure and wear protective equipment.

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

  1. Install the O-ring seal and plug (19). Tighten plug (19) to a torque of 200 N·m (148 lb ft).

  1. Install cap (22) .

  1. Position spool (16), seat (17), spring (18), O-ring seal (20), and cover (21) .

  1. Install bolts (15). Tighten bolts (15) to a torque of 10.4 N·m (92 lb in).

  1. Install the O-ring seal and valve (23). Tighten valve (23) to a torque of 100 N·m (74 lb ft).



    Illustration 18g01172683



    Illustration 19g01172682

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

    Improper assembly of parts that are spring loaded can cause bodily injury.

    To prevent possible injury, follow the established assembly procedure and wear protective equipment.

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

  1. Install fitting (11), solenoid (12), and cap (14). Tighten solenoid (12) to a torque of 12 ± 5 N·m (9 ± 4 lb ft).

  1. Position O-ring seal (8), seat (9), spring (10), and block (6) .

  1. Install bolts (7). Tighten bolts (7) to a torque of 10.4 N·m (92 lb in).

  1. Install the O-ring seal and valve (13). Tighten valve (13) to a torque of 100 N·m (74 lb ft).

  1. Position O-ring seals (5) .



    Illustration 20g01172681

  1. Position combination valve (4) .

  1. Install bolts (3). Tighten bolts (3) to a torque of 10 N·m (89 lb in).

  1. Connect tube assembly (2) .



    Illustration 21g01172679

  1. Install all the caps and the plugs to main control valve (1) .

End By: Install the main control valve. Refer to Disassembly and Assembly, "Main Control valve - Install".

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