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

Removal Procedure

Start By:

1. Remove the alternator. Refer to Disassembly and Assembly, "Alternator - Remove and Install".

Note: Put identification marks on all hoses, on all hose assemblies, on all wires, and on all tube assemblies for installation purposes. Plug all hose assemblies and all tube assemblies. This helps to prevent fluid loss, and this helps to keep contaminants from entering the system.

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.

1. 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".
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2. Remove bolts (1). Position refrigerant condenser (2) and bracket (3) out of the way.
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3. Remove hose (4). Disconnect hose (5) and harness assembly (6).
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4. Remove belt (10) from support (8).

5. Attach Tooling (A) and a suitable lifting device to air cleaner (7) and support (8). The weight of air cleaner (7) and support (8) is approximately 79 kg (175 lb).

6. Remove bolts (9). Remove air cleaner (7) and support (8).
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7. Disconnect hose (11) and tube assembly (12).

8. Remove bolts (13) and housing (14).
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9. Disconnect hoses (17) and (20). Remove bolts (18) and disconnect bonnet (19).

10. Remove bolts (16) and water pump (15).

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.

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Illustration 6	g01154903

1. Position water pump (15) and install bolts (16).

2. Position bonnet (19) and install bolts (18). Connect hoses (17) and (20).
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3. Position housing (14) and install bolts (13).

4. Connect hose (11) and tube assembly (12).
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5. Attach Tooling (A) and a suitable lifting device to air cleaner (7) and support (8). The weight of air cleaner (7) and support (8) is approximately 79 kg (175 lb).

6. Position air cleaner (7) and support (8). Install bolts (9).

7. Install belt (10).
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   Illustration 9	g01154761

8. Install hose (4). Connect hose (5) and harness assembly (6).
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   Illustration 10	g01154737

9. Position refrigerant condenser (2) and bracket (3). Install bolts (1).

10. Refill the cooling system. Refer to Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change".

End By:

1. Install the alternator. Refer to Disassembly and Assembly, "Alternator - Remove and Install".