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

Removal Procedure

Start By:

1. Release the hydraulic system pressure.

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Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns. Remove cooling system pressure cap slowly to relieve pressure only when engine is stopped and cooling system pressure cap is cool enough to touch with your bare hand. Do not attempt to tighten hose connections when the coolant is hot, the hose can come off causing burns. Cooling System Coolant Additive contains alkali. Avoid contact with skin and eyes.

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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.

1. Turn the battery disconnect switch to the OFF position.

2. Refer to Operation and Maintenance Manual, "Cooling System Coolant - Change" for the correct draining and filling procedures.

3. Drain the hydraulic oil. Refer to Operation and Maintenance Manual, "Hydraulic System Oil - Change" for correct draining and filling procedure.
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   Illustration 1	g02346242

4. Remove sheet assembly (1), hose (2), coolant tank (3), and guard assembly (4).
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   Illustration 2	g02346243

5. Loosen clamps (5).

6. Loosen clamp (6) and reposition shroud seal (7).
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   Illustration 3	g02346244

7. Remove bolts (8) and sheet assembly (9).
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8. Loosen clamps (10) and (11). Reposition clamps (10) and (11).

9. Disconnect hose (12).
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   Illustration 5	g02346369

10. Remove bolts (16) and reposition shroud assembly (17).

11. Remove bolts (13), bolts (14), and bracket assembly (15).
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    Illustration 6	g02346374

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    Illustration 7	g02346375

12. Disconnect hose (19).

13. Attach Tooling (A) and a suitable lifting device to aftercooler (18). The weight of aftercooler (18) is approximately 29 kg (64 lb).

14. Remove bolts (20) and aftercooler (18).

Installation Procedure

1. Install aftercooler (18) in the reverse order of removal.

   1. Tighten bolts (20) and bolts (14) to a torque of 35 to 40 N·m (26 to 30 lb ft).

   2. Apply Tooling (B) to the threads of bolts (8).