336E Excavator and 336E MHPU Mobile Hydraulic Power Unit C9.3 Engine Supplement Engine and Main Hydraulic Pump - Remove and Install Caterpillar


Engine and Main Hydraulic Pump - 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 
189-0409  Shackle 
180-3034  Jack Stand 
180-3033  Jack Stand 
1U-9200  Lever Puller Hoist 
138-7575  Link Bracket 

Start By:

  1. Remove the clean emissions module.

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

Personal injury can result from contact with refrigerant.

Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.

Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.

Always use precaution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated area.

Personal injury or death can result from inhaling refrigerant through a lit cigarette.

Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.

Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.

Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.


  1. Refer to Service Manual, SENR5664, "Air Conditioning and Heating Systems with R-134a Refrigerant" for the correct recovery and charging procedures. Refer to Special Publication, NEDG2500, "Air Conditioning Tools" for the correct tools.

  2. Drain the hydraulic fluid into a suitable container for storage or disposal. Refer to Operation and Maintenance Manual, "Hydraulic System Oil - Change" for the correct draining and filling procedures.

  3. Drain the coolant from the cooling system into a suitable container for storage or for disposal. Refer to Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change" for the correct draining and filling procedures.

  4. Turn the battery disconnect switch to the OFF position and turn the fuel supply to the OFF position.


    Illustration 1g02148482

  5. Open right rear access door (1) and attach a suitable lifting device. The weight of door (1) is approximately 33 kg (72 lb).

  6. Remove door (1).


    Illustration 2g02202495

  7. Remove panels (2).


    Illustration 3g02198973

  8. Remove step (3). Remove support (4).


    Illustration 4g02148529

  9. Remove support assembly (5).

  10. Attach a suitable lifting device to support assembly (5). The weight of support assembly (5) is approximately 210 kg (463 lb).

  11. Remove support assembly (5).

    Note: Remove any harness clips and any harnesses attached to support assembly (5).



    Illustration 5g02149273

  12. Disconnect harness assembly (8).

  13. Disconnect hose assemblies (6), (7), (9), (11), and (12).

  14. Remove pipe (10).

    Note: Use a suitable container to collect any hydraulic oil.



    Illustration 6g02201715

  15. Disconnect bracket (13).


    Illustration 7g02202235

  16. Disconnect hoses (14) and (16). Disconnect tube (15).


    Illustration 8g02202537

  17. Disconnect hoses (17), (18), (19), and (21). Remove brackets (20).

    Note: Hose (17) must be inspected for wear or damage. If damage is present, the hose must be replaced.



    Illustration 9g02202173

  18. Disconnect hoses (22). Disconnect harness assembly (23) and reposition out of the way.


    Illustration 10g02149302

  19. Disconnect hoses (24) and (25).

    Note: Hose (25) must be inspected for wear or damage. If damage is present, the hose must be replaced.



    Illustration 11g02205937

  20. Remove bracket (26).


    Illustration 12g02205938

  21. Remove bracket (27).


    Illustration 13g02149402

  22. Disconnect hose assemblies (28) and clip (29).


    Illustration 14g02149406

  23. Disconnect clips (30).


    Illustration 15g02149413

  24. Disconnect clip (31).


    Illustration 16g02149603

  25. Disconnect hose assembly (32).


    Illustration 17g02149668

  26. Disconnect clamp (33). Disconnect harness assemblies (34) and (35). Disconnect ground strap (36). Disconnect hose assembly (37).


    Illustration 18g02205454

  27. Attach Tooling (A) and a suitable lifting device to engine and main hydraulic pump (38). The weight of engine and main hydraulic pump (38) is approximately 1542 kg (3400 lb).


    Illustration 19g02205976

  28. Remove rear engine support bolts (39).


    Illustration 20g02205977

  29. Remove front engine support bolts (40).


    Illustration 21g02149709
    Typical Example

  30. Remove engine and main hydraulic pump (38) and place on Tooling (B) and Tooling (C).


    Illustration 22g02149724
    Typical Example

  31. Attach Tooling (D), Tooling (E), and a suitable lifting device to hydraulic pump (41). The weight of hydraulic pump (41) is approximately 227 kg (500 lb).

  32. Remove bolts (42) and remove hydraulic pump (41).

Installation Procedure

  1. Install engine and main hydraulic pump (38) in the reverse order of removal.

  2. Install front engine support bolts (40) to a torque of 520 ± 70 N·m (384 ± 52 lb ft).

  3. Install rear engine support bolts (39) to a torque of 900 ± 100 N·m (664 ± 74 lb ft).

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