320D2 GC Excavator Machine Systems Counterbalance Valve (Travel) - Assemble Caterpillar


Counterbalance Valve (Travel) - Assemble
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1.1. Assembly Procedure

Assembly Procedure

Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. Prior to installation, lubricate all seals with clean oil.



    Illustration 1g01368455


    Illustration 2g01368491

    Note: The grooved side of spacer (19) faces spring (21).

  1. Install spool (20) into counterbalance valve (3). Install spacer (19) onto spool (20).

  2. Install spring (21) and sleeve (22).


    Illustration 3g01368503

    ------ 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.


  3. Position cover (18) and install bolts (17). Tighten bolts (17) to a torque of 79 ± 8 N·m (58 ± 6 lb ft).

  4. Repeat Steps 1 through 3 for the remaining cover.

  5. Assemble the relief valves in the following manner:


      Illustration 4g01368449

    1. Install O-ring seal (7) and backup rings (6) onto piston (5).

    2. Install piston (5) into body (14).

    3. Install O-ring seal (9) and backup ring (8) onto stop (10).

    4. Install stop (10) and screw (15) into body (14).

    5. Install nut (16). Tighten nut (16) to a torque of 92 ± 8 N·m (68 ± 6 lb ft).

    6. Install O-ring seal (13) onto body (14).

    7. Install O-ring seal (12) and backup rings (11).

    8. Repeat Steps 5.a through 5.g for the remaining relief valve.


    Illustration 5g00901497

  6. Install relief valves (4) into counterbalance valve (3). Tighten relief valves (4) to a torque of 540 ± 50 N·m (398 ± 37 lb ft).


    Illustration 6g00901466

  7. Install O-ring seals (2) onto plugs (1). Install plugs (1) into counterbalance valve (3). Tighten plugs (1) to a torque of 31 ± 3 N·m (23 ± 2 lb ft).

End By:

  1. Install the counterbalance valve.

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