336D 2L and 340D 2L Excavators Machine Systems Main Control Valve - Remove and Install Caterpillar


Main Control Valve - Remove and Install
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1.1. Removal Procedure
2.1. Installation Procedure

Removal Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
439-3940  Link Bracket 

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.

Note: Put identification marks on all lines, on all hoses, on all harness assemblies, 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.


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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.

Dispose of all fluids according to local regulations and mandates.


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

Personal injury can result from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.


  1. Drain the hydraulic fluid into a suitable container for storage or disposal. Refer to Operation and Maintenance Manual, "Refill Capacities".


    Illustration 1g06032890

  2. Open door (1).


    Illustration 2g01214373

  3. Remove bolts (2).


    Illustration 3g01214374

  4. Open engine hood (3).


    Illustration 4g01214375

  5. Remove bolts (4) and panel (5).


    Illustration 5g01214377


    Illustration 6g01214378

  6. Remove hose (7).

  7. Disconnect clip (10). Remove bolts (6) and bracket (9).

  8. Remove bolts (8) and cut cable straps (11).


    Illustration 7g01214379

  9. Remove bolts (12).


    Illustration 8g01214381

  10. Remove bolt (13).

  11. Remove bolt (16), panel (14), and panel (15).


    Illustration 9g01214383

  12. Remove bolts (17) and sheet assembly (18).


    Illustration 10g01214384

  13. Disconnect hose (21).

  14. Remove bolts (19) and (20).

  15. Place tube assembly (22) aside.


    Illustration 11g01214385

  16. Remove clamps (23), (24), and (25).


    Illustration 12g01214386

  17. Disconnect hose assemblies (26), (27), (28), (29), (30), (31), and (32).


    Illustration 13g01214388

  18. Remove clamp (33) and disconnect hose assemblies (34), (35), (36), (37), and (38).


    Illustration 14g01214420

  19. Disconnect hose assembly (41).

  20. Cut cable strap (39) and disconnect harness assembly (40).


    Illustration 15g01214389

  21. Disconnect hose assemblies (42), (43), (44), (45), (46), (47), and (48).


    Illustration 16g01214424

  22. Disconnect clamp (49) and clip (50).


    Illustration 17g01214426

  23. Disconnect hose assemblies (51), (52), and (53).


    Illustration 18g01214427

  24. Disconnect hose assemblies (54), (55), and (56).


    Illustration 19g01214429

  25. Remove bolts (57) and block assembly (58).


    Illustration 20g01214430

  26. Disconnect hose assemblies (59) and (60).


    Illustration 21g01214431

  27. Disconnect hose assemblies (61) and (62).


    Illustration 22g01214432

  28. Disconnect hose assemblies (63) and (64).


    Illustration 23g01214433

  29. Disconnect hose assemblies (66), (67), and (68).

  30. Disconnect tube assembly (65).


    Illustration 24g01214434

  31. Disconnect hose assemblies (69), (70), and (71).


    Illustration 25g01214436

  32. Disconnect clamp (72) from tube assembly (65).


    Illustration 26g01214437

  33. Disconnect clamp (73) and pull tube assembly (65) away from the main control valve.


    Illustration 27g01214463

  34. Disconnect hose assembly (74).


    Illustration 28g01214464

  35. Remove bolts (76) and disconnect block assembly (75).


    Illustration 29g01214465

  36. Loosen jam nut (78) to rotate hose assembly (77).

  37. Remove bolts (79) to disconnect block assembly (80).


    Illustration 30g01214466

  38. Disconnect hose assemblies (81) and (82).


    Illustration 31g01214467

  39. Disconnect hose assembly (83).


    Illustration 32g01214468

  40. Disconnect all hose assemblies (84) from the bottom of the main control valve.


    Illustration 33g01214469

  41. Disconnect hose assembly (85).


    Illustration 34g01214476

  42. Fasten Tooling (A) and a suitable lifting device to main control valve (86). The weight of main control valve (86) is approximately 210 kg (463 lb).


    Illustration 35g01214477


    Illustration 36g01214478

  43. Remove mounting bolts (87) and use the suitable lifting device to remove main control valve (86).

Installation 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 37g01214478


    Illustration 38g01214476

  1. Use Tooling (A) and a suitable lifting device to install main hydraulic pump (86) on the machine. The weight of main control valve (86) is approximately 210 kg (463 lb).


    Illustration 39g01214477

  2. Install mounting bolts (87).


    Illustration 40g01214469

  3. Connect hose assembly (85).


    Illustration 41g01214468

  4. Connect all hose assemblies (84) to the bottom of the main control valve.


    Illustration 42g01214467

  5. Connect hose assembly (83).


    Illustration 43g01214466

  6. Connect hose assemblies (81) and (82).


    Illustration 44g01214465

  7. Connect block assembly (80) and install bolts (79).

  8. Rotate hose assembly (77) into position and tighten jam nut (78).


    Illustration 45g01214464

  9. Connect block assembly (75) and install bolts (76).


    Illustration 46g01214463

  10. Connect hose assembly (74).


    Illustration 47g01214437

  11. Position tube assembly (65) and install clamp (73).


    Illustration 48g01214436

  12. Connect clamp (72) on tube assembly (65).


    Illustration 49g01214434

  13. Connect hose assemblies (69), (70), and (71).


    Illustration 50g01214433

  14. Connect tube assembly (65).

  15. Connect hose assemblies (66), (67), and (68).


    Illustration 51g01214432

  16. Connect hose assemblies (63) and (64).


    Illustration 52g01214431

  17. Connect hose assemblies (61) and (62).


    Illustration 53g01214430

  18. Connect hose assemblies (59) and (60).


    Illustration 54g01214429

  19. Connect block assembly (58) and install bolts (57).


    Illustration 55g01214427

  20. Connect hose assemblies (54), (55), and (56).


    Illustration 56g01214426

  21. Connect hose assemblies (51), (52), and (53).


    Illustration 57g01214424

  22. Connect clamp (49) and clip (50).


    Illustration 58g01214389

  23. Connect hose assemblies (42), (43), (44), (45), (46), (47), and (48).


    Illustration 59g01214420

  24. Connect harness assembly (40) and install cable strap (39).

  25. Connect hose assembly (41).


    Illustration 60g01214388

  26. Connect hose assemblies (34), (35), (36), (37), and (38). Install clamp (33).


    Illustration 61g01214386

  27. Connect hose assemblies (26), (27), (28), (29), (30), (31), and (32).


    Illustration 62g01214385

  28. Install clamps (23), (24), and (25).


    Illustration 63g01214384

  29. Position tube assembly (22) and install bolts (19) and (20).

  30. Connect hose (21).


    Illustration 64g01214383

  31. Install walkway (18) and bolts (17).


    Illustration 65g01214381

  32. Install panel (15), panel (14), bolt (16), and bolt (13).


    Illustration 66g01214379

  33. Install bolts (12).


    Illustration 67g01214378


    Illustration 68g01214377

  34. Install cable straps (11) and bolts (8).

  35. Install bracket (9), bolts (6), and clip (10).


    Illustration 69g01214375

  36. Install panel (5) and bolts (4).


    Illustration 70g01214374

  37. Close engine hood (3).


    Illustration 71g01214373

  38. Install bolts (2).


    Illustration 72g06032890

  39. Close door (1).

  40. Fill the hydraulic system with fluid. Refer to Operation and Maintenance Manual, "Refill Capacities".

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