621H, 623H and 627H Wheel Tractor-Scrapers Engine Supplement Caterpillar

Removal Procedure

Start By:

1. Remove the crankcase guard.

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Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

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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.

1. Refer to Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change" for the correct draining and filling procedure.

2. Refer to the Operation and Maintenance Manual, "Transmission Oil - Change" for the correct draining and filling procedures.

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Illustration 1	g02666916

3. Remove bolts (1) and panel assembly (2) .

4. Remove panel assembly (3) .

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Illustration 2	g02666917

5. Disconnect harness assemblies (4). Remove hose (5) .

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Illustration 3	g02666918

6. Disconnect hose assembly (6), harness assembly (7), hose assembly (8), and hose (9) .

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Illustration 4	g02666919

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Illustration 5	g02666920

7. Attach Tooling (A) and a suitable lifting device to transmission oil cooler (10). The weight of transmission oil cooler (10) is approximately 23 kg (50 lb).

8. Remove bracket (11). Remove three bolts (12).

9. Disconnect tube assembly (14) .

10. Remove bracket assembly (13) and transmission oil cooler (10) .

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Illustration 6	g02667519

11. Remove bonnet (15) and the gasket from core assembly (16) .

12. Remove coupling (19) from bonnet (17). Remove O-ring seals (20) from bonnet (17) .

13. Remove O-ring seal from bonnet (17) .

14. Remove bonnet (17) and the gasket from core assembly (16) .

Installation Procedure

1. Install transmission oil cooler (10) in the reverse order of removal.

   1. Tighten bolts (1) to a torque of 15 ± 3 N·m (133 ± 27 lb in).