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301.6C and 301.8C Mini Hydraulic Excavators Machine Systems Caterpillar


Main Control Valve - Disassemble

Usage:

301.6C JBB

Disassembly Procedure

Start By:

  1. Remove the main control valve. Refer to Disassembly and Assembly, "Main Control Valve - Remove".

Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

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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.

Note: Note the location and orientation of the components for assembly purposes.

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    Illustration 1g01172649

  1. Remove nuts (2) and cover (1) .

  1. Remove tube assembly (3) .
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    Illustration 2g01172652

  1. Remove O-ring seal (4) from cover (1) .
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    Illustration 3g01172654

  1. Remove valve assembly (5) .
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    Illustration 4g01172670

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    ------ 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 O-ring seal (17) and (18) from valve assembly (5) .

  1. Remove bolts (7), housing (6), bolt (8), retainer (9), spring (10), retainer (11), and spool (12) .

  1. Remove bolts (16), housing (15), and O-ring seal (14) .

  1. Remove plug (13) and the O-ring seal.
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    Illustration 5g01172690

  1. Remove valve assembly (19) .
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    Illustration 6g01172692

  1. Remove bolts (20), housing (21), retainer (22), spring (23), housing (24), spacer (25), wiper seal (26), O-ring seal (27), adapter (28), and spool (29) .

  1. Remove plug (30) and the O-ring seal.

  1. Remove O-ring seals (31) and (32) .

  1. Remove bolts (36) and plate (35). wiper seal (34), and O-ring seal (33) .
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    Illustration 7g01172721

  1. Remove valve assembly (37) .
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    Illustration 8g01172722

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    ------ 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 O-ring seals (49) and (50) .

  1. Remove plug (48) and the O-ring seal.

  1. Remove bolts (38), housing (39), bolt (40), retainer (41), spring (42), retainer (43), plate (44), wiper seal (45), O-ring seal (46), and spool (47) .

  1. Remove bolts (54), plate (53), wiper seal (52), and O-ring seal (51) .
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    Illustration 9g01172806

  1. Remove valve assembly (59) .

  1. Remove check valve (56) and the O-ring seal.

  1. Repeat Steps 6 and 7 for valve (55) .

  1. Remove plug (57), plugs (58), and the O-ring seals.
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    Illustration 10g01172807

  1. Remove valve assembly (61) .

  1. Remove O-ring seals (63) and (64) .

  1. Remove plug (62) and the O-ring seal.

  1. Remove check valve (60), check valve (65), and the O-ring seals.

  1. Repeat Steps 17 and 18 for valve (66) .
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    Illustration 11g01172819

  1. Remove valve assembly (68) .

  1. Remove O-ring seals (70) and (71) .

  1. Remove plug (69) and the O-ring seal.

  1. Remove check valve (67), check valve (72), and the O-ring seals.

  1. Repeat Steps 6 and 7 for valve (73) .
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    Illustration 12g01172847
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    Illustration 13g01172848

  1. Remove valve assembly (74) .

  1. Remove O-ring seals (75), (76), and (77) .

  1. Remove O-ring seals (78) and (80) .

  1. Remove plug (79) and the O-ring seal.

  1. Repeat Steps 17 and 18 for valve (81) .
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    Illustration 14g01172860

  1. Remove valve assembly (84) .

  1. Remove plugs (85) and the O-ring seals.

  1. Remove check valve (83), check valve (86), and the O-ring seals.

  1. Repeat Steps 6 and 7 for valve (82) .
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    Illustration 15g01172885
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    Illustration 16g01172888

  1. Remove valve assembly (87) .

  1. Remove O-ring seals (88), (90), (91), and (92) .

  1. Remove plug (89) and the O-ring seal.

  1. Repeat Steps 17 and 18 for valve (93) .
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    Illustration 17g01172909

  1. Remove valve assembly (94) .
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    Illustration 18g01172919

  1. Remove O-ring seals (97) and (98) .

  1. Remove plug (99) and the O-ring seal.

  1. Remove check valve (96), check valve (100), and the O-ring seals.

  1. Repeat Steps 6 and 7 for valve (95) .
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    Illustration 19g01172995
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    Illustration 20g01172996

  1. Remove valve assembly (101) .

  1. Remove plug (104), O-ring seal (105), spring (106), and spool (107) .

  1. Remove plug (108) and the O-ring seal.

  1. Remove check valve (103), check valve (109), and the O-ring seals.

  1. Repeat Steps 6 and 7 for valve (102) .
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    Illustration 21g01173004

  1. Remove cover (110) from studs (111) .

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