345B, 345B Series II and W345B Series II Excavators Machine Systems Main Control Valve - Assemble Caterpillar


Main Control Valve - Assemble
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1.1. Assembly Procedure
2.2. Regeneration Valve for the Stick
3.2. Stroke Limiter for Tamping Mode
4.2. Stem Assemblies for the Main Control Valve
5.2. Straight Travel Stem Assembly
6.2. Relief Valve for Negative Flow Control
7.2. Main Relief Valve
8.2. Plug for the Attachment Control Valve
9.2. Line Relief Valves
10.2. Check Valve for the Boom II Control Valve
11.2. Check Valves for the Left Travel Control Valve and the Right Travel Control Valve
12.2. Check Valves for the Straight Travel Control Valve
13.2. Load Check Valves
14.2. Check valve for the Stick I Control Valve
15.2. Swing Priority Valve

Assembly Procedure

    Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement.



    Illustration 1g00639066

  1. Install O-ring seal (201) to the left main valve body.


    Illustration 2g00639061

  2. Install two large O-ring seals (200), two medium O-ring seals (199), and six small O-ring seals (198) to the right main valve body.


    Illustration 3g00639060

  3. The weight of each main valve body is 227 kg (500 lb). Assemble the main valve bodies. Install the washers and four bolts (196) that hold left main valve body (197) and right main valve body (195) together.


    Illustration 4g00639055

  4. Install O-ring seal (194) onto plug (192).


    Illustration 5g00639054

  5. Install O-ring seal (193) onto sensors (191).


    Illustration 6g00639051

  6. Install two sensors (191) and plug (192) into the main valve body.


    Illustration 7g00639046

  7. Install seat (190) for the straight travel spool assembly into the main valve body.


    Illustration 8g00639044

  8. Install spring (189) in the seat.


    Illustration 9g00639041

  9. Install O-ring seal (188) in each of the nine housings (187).


    Illustration 10g00639039

  10. Install nine housings (187). Install bolts (186) that hold the housings in position.

Regeneration Valve for the Stick

  1. Assemble the regeneration valve (176) for the stick, as follows:


      Illustration 11g00639038

    1. Install O-ring seals (178), and (184) onto valve body (177).

    2. Install pin (185), valve (183), spring (182), rod (181), spool valve (180), and spring (179) into valve body (177).


    Illustration 12g00639036

  2. Place regeneration valve (176) into position and install four bolts (175).

Stroke Limiter for Tamping Mode

  1. Assemble stroke limiter (167), as follows:


      Illustration 13g00639012

    1. Install O-ring seal (171) into valve body (170).

    2. Install O-ring seal (169) onto plug (168).

    3. Install piston (174), spring (173), and spacer (172) into valve body (170).

    4. Install plug (168) into valve body (170).


    Illustration 14g00638988

  2. Put stroke limiter (167) into position on the main valve body. Compress the spring inside the stroke limiter by hand, and install two bolts (166).

Stem Assemblies for the Main Control Valve

  1. Assemble the stem for the boom I (137), as follows:


      Illustration 15g00638987

    1. Install O-ring seal (165) onto rod (159).

    2. Install valve (164) and spring (163) onto the end of the spool.

    3. Install rod (159).

    4. Install retainer (162), spring (161), and retainer (160) onto the end of rod (159).

    5. Install the washer (158) and bolt (157) to the other end of spool (148).


      Illustration 16g00638986

    6. Install O-ring seal (155) onto plug (156).

    7. Install spring (149), valve (150), spring (151), valve (152), valve (153), spring (154), and plug (156) into spool (148).

    Note: The assembly procedure for the stem for right travel (134) and the stem for the left travel (133) is identical as the previous stems except the stems for travel have an adapter.



    Illustration 17g00638985

  2. Install O-ring seals (144), (146) and (147) onto adapter (145).

  3. Assemble the stems for boom II (130), swing (132), right travel (134), bucket (136), and stick II (138), as follows:


      Illustration 18g00638984

    1. Install retainer (142), spring (141), and retainer (140) into spool (143).

    2. Install bolt (139) into the end of spool (143).


    Illustration 19g00638983

  4. Install the stems for stick I (131), left travel (133), attachment (135), and boom I (137) into the main valve bodies.

  5. Install the stems for the boom II (130), swing (132), right travel (134), bucket (136), and stick II (138) into the main valve bodies.


    Illustration 20g00638982

  6. Install O-ring seal (129) into each housing (128).


    Illustration 21g00638980

  7. Install the nine housings (128) in the original position.

  8. Install bolts (127) that hold the housings in position.

Straight Travel Stem Assembly

  1. Assemble the stem (100) for straight travel, as follows:


      Illustration 22g00638974

    1. Install O-ring seal (102) onto plug (101).

    2. Install valve (105), spring (104), dowel (103), and plug (101) into spool (106).

    3. Install piston (107) into spool (106).


    Illustration 23g00638973

  2. Install the stem (100) for straight travel into the main valve body.


    Illustration 24g00638972

  3. Install O-ring seal (99) onto plug (98).


    Illustration 25g00638971

  4. Install plug (98) into the main valve body.

Relief Valve for Negative Flow Control

  1. Assemble the two relief valves for negative flow control, as follows:


      Illustration 26g00638969

    1. Install O-ring seal (93) and O-ring seal (94) onto valve body (95).

    2. Install O-ring seal (96) onto plug (97).

    3. Install valve (91), spring (92), and plug (97) into valve body (95).


    Illustration 27g00638957

  2. Install two relief valves (90) for the negative flow control to the main valve bodies.

Main Relief Valve

  1. Assemble main relief valve (73), as follows:


      Illustration 28g00638955

    1. Install the filter, collar (88), and ring (89) into valve (83).


      Illustration 29g00638949

    2. Install O-ring seals (85), (86) and (87) onto valve body (84).

    3. Assemble valve body (84).

    4. Install valve (83), spring (82), and seat (81) into valve body (84).


      Illustration 30g00638946

    5. Install O-ring seal (75) onto adjuster (76).

    6. Install O-ring seal (78) onto adapter (77).

    7. Install valve (80), spring (79), and adapter (77) into valve group (84).

    8. Install adjuster (76) and nut (74) into adapter (77).


    Illustration 31g00638945

  2. Install main relief valve (73) into the main valve body.

Plug for the Attachment Control Valve



    Illustration 32g00638944

  1. Install O-ring seal (72), backup ring (71), and O-ring seal (70) onto plug (69).


    Illustration 33g00638943

  2. Install plug (69) into the attachment control valve.

Line Relief Valves

  1. Assemble line relief valves (43), (44), (45), (46), (47), and (48), as follows:


      Illustration 34g00638941

    1. Install O-ring seals (58) and (59) into nut (68).

    2. Install O-ring seal (56), backup ring (65), and seal (55) onto adapter (66).

    3. Install backup ring (62) and O-ring seal (52) onto valve (53).

    4. Install O-ring seal (49) onto adapter (50).

    5. Install spring (64), spring (54), valve (63), valve (53), and sleeve (51) into the bottom half of the relief valve.

    6. Install needle valve (57) and spring (67) into adapter (66).

    7. Screw nut (68) onto adjusting screw (60). Make sure that you install the nut with the correct number of turns that was documented in the disassembly. The valve must be reset to the correct relief pressure if the number of turns were not documented.

    8. Install cap (61) onto adjusting screw (60).

    9. Connect adapter (50) into adapter (66).


    Illustration 35g00638926


    Illustration 36g00638940

  2. Install line relief valve (43), (44) and (45) to the top of the main valve. Install line relief valve (46), (47), and (48) to the bottom of the main valve.

Check Valve for the Boom II Control Valve



    Illustration 37g00638863

  1. Install check valve (38) to the boom II control valve, as follows:


      Illustration 38g00638878

    1. Install O-ring seal (41) onto plug (42).

    2. Install check valve (39), spring (40), and plug (42) into the Boom II Control Valve.

Check Valves for the Left Travel Control Valve and the Right Travel Control Valve



    Illustration 39g00638858

  1. Install two check valves (34) to the travel control valves, as follows:


      Illustration 40g00638862

    1. Install two sleeves (37) into the travel control valves.


      Illustration 41g00638861

    2. Install O-ring seal (35) onto each plug (36). Install two plugs (36).

Check Valves for the Straight Travel Control Valve



    Illustration 42g00638844

  1. Install two check valves (28) to the straight travel control valve, as follows:


      Illustration 43g00638851

    1. Install two check valves (32) and two springs (33) into the left travel control valve and the right travel control valve.


      Illustration 44g00638848

    2. Install backup ring (30) and O-ring seal (29) onto each plug.

    3. Install two plugs (31) into the main valve body.

Load Check Valves



    Illustration 45g00638841

  1. Install six load check valves (23) into the main control valve, as follows:


      Illustration 46g00638838

    1. Install O-ring seal (26) onto each plug (27).

    2. Install six check valves (24), six springs (25), and six plugs (27) into the main valve body.


    Illustration 47g00638836

  1. Install O-ring seal (22) onto adapter (21).


    Illustration 48g00638787

  2. Install adapter (21) into the front of the main valve body.

Check valve for the Stick I Control Valve

  1. Install the check valve to the stick I control valve, as follows.


    Illustration 49g00638786

  2. Install two shims (20) and sleeve (19) into the stick I control valve.


    Illustration 50g00638783

  3. Install check valve (18) into the stick I control valve.


    Illustration 51g00638782

  4. Install spring (17) into the stick I control valve.


    Illustration 52g00638780

  5. Install pilot valve (16) into the stick I control valve.


    Illustration 53g00638768

  6. Install O-ring seal (15) to the plate. Install plate (14) to the stick I control valve.

    Note: Use bolts in order to hold the plate in position until the main control valve is placed back into the machine and the proper tube assembly is hooked up.

Swing Priority Valve

  1. Assemble swing priority valve (2), as follows:


      Illustration 54g00638765

    1. Install O-ring seal (12) onto plug (13).

    2. Install O-ring seal (8) onto plug (7).

    3. Install plug (13), valve (11), spool (10) and spring (9) into the valve body.

    4. Install plug (7).


      Illustration 55g00638763

    5. Install O-ring seals (5) and (6) into the valve body.


    Illustration 56g00638557

  2. Install check valve (4) into the main valve body.


    Illustration 57g00638556

  3. Install spring (3) into the main valve body.


    Illustration 58g00638555

  4. Install swing priority valve (2) into the main valve body.

  5. While you hold swing priority valve (2) in place, install four bolts (1).

End By:

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

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