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

Removal Procedure

Start By:

1. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic System Pressure - Release".

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.

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Illustration 1	g01148359

1. Install Tooling (A) onto hydraulic tank (1). Apply 276 to 414 kPa (40 to 60 psi) of air pressure to Tooling (A) .

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Illustration 2	g01148328

2. Remove grill assembly (2) .

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Illustration 3	g01148380

3. Disconnect tube assemblies (5) .

4. Attach a suitable lifting device to hydraulic oil cooler (4). The weight of hydraulic oil cooler (4) is approximately 27 kg (60 lb).

5. Remove bolts (3) and hydraulic oil cooler (4) .

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 4	g01148380

1. Attach a suitable lifting device to hydraulic oil cooler (4). The weight of hydraulic oil cooler (4) is approximately 27 kg (60 lb).

2. Position hydraulic oil cooler (4) and install bolts (3) .

3. Connect tube assemblies (5) .

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Illustration 5	g01148328

4. Install grill assembly (2) .

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Illustration 6	g01148359

5. Remove Tooling (A) from hydraulic tank (1) .