336E Excavator and 336E MHPU Mobile Hydraulic Power Unit Machine Systems Swivel - Remove and Install Caterpillar

Removal Procedure

Start By:

1. Release the hydraulic system pressure.

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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.

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Illustration 1	g02138737

1. Remove the cap from the hydraulic tank. Install Tooling (A) onto the hydraulic tank. Attach an air supply hose to Tooling (A). Apply 276 to 414 kPa (40 to 60 psi) of air. This procedure will pull vacuum on the hydraulic system.
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   Illustration 2	g02141286

2. Disconnect hose assembly (3) and reposition hose assembly (3).

3. Disconnect fitting assembly (1). Disconnect hose assemblies (4) from swivel (2).

4. Remove support (5).
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   Illustration 3	g02141287

5. Remove clamp (9), bolts (8), retainer (6), and boot (7).
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   Illustration 4	g02141290

   Note: The guards can be heavier due to debris on top of the guards.

6. Use Tooling (C) in order to support and remove guards (11) and (12). The weight of each guard (11) and guard (12) is approximately 23 kg (50 lb). Remove bolts (10), guard (11), and guard (12).
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   Illustration 5	g02141288

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   Illustration 6	g02141291

7. Disconnect hose assemblies (13) and remove fittings (14).

8. Disconnect fitting (17) and hose assemblies (16) from swivel (2).

9. Attach Tooling (B) and a suitable lifting device to swivel (2). The weight of swivel (2) is approximately 45 kg (95 lb). Remove bolts (15) and swivel (2).

Installation Procedure

1. Install swivel (2) in the reverse order of removal.

   1. Apply Tooling (D) to the mating surface of swivel (2) and the cover of the undercarriage frame.

   2. Apply Tooling (E) to the threads of bolts (15).

   3. Tighten clamp (9) to a torque of 5 ± 1 N·m (44 ± 9 lb in).

   4. Apply Tooling (E) to the threads of bolts (8). Tighten bolts (8) to a torque of 37 ± 4 N·m (27 ± 3 lb ft).