AD55B Underground Articulated Truck C27 Engine Supplement Caterpillar

Removal Procedure

Start By:

1. Connect the steering frame lock. Refer to Disassembly and Assembly, "Steering Frame Lock - Separate and Connect".
2. Remove the engine bottom guard. Refer to Disassembly and Assembly, "Bottom Guard (Engine) - Remove and Install".
3. Remove the transmission bottom guard. Refer to Disassembly and Assembly, "Bottom Guard (Transmission) - Remove and Install"

Note: Cleanliness is an important factor. Before the removal procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

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

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At operating temperature, the engine coolant is hot and under pressure. Steam can cause personal injury. Check the coolant level only after the engine has been stopped and the fill cap is cool enough to touch with your bare hand. Remove the fill cap slowly to relieve pressure. Cooling system conditioner contains alkali. Avoid contact with the skin and eyes to prevent personal injury.

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

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 (DEAC) - Change" or Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change". Refer to Operation and Maintenance Manual, "Capacities (Refill)" for the capacity of the cooling system.

2. Drain the hydraulic tank into a suitable container for storage or for disposal. Refer to Operation and Maintenance Manual, "Capacities (Refill)" for the capacity of the hydraulic tank. Refer to Operation and Maintenance Manual, "Hydraulic System Oil - Change" for the proper draining procedure.

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Illustration 1	g01440997

3. Remove clip (1) .

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Illustration 2	g01440992

4. Disconnect harness assembly (2). Cut cable strap (3). Disconnect harness assembly (4). Disconnect harness assemblies (5) and (7). Remove two bolts (6) and the two clips. Position filter base (8) out of the way.

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Illustration 3	g01441000

5. Use Tooling (A) in order to remove filter assemblies (9) .

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Illustration 4	g01441001

6. Remove two clips (12). Disconnect hose assembly (11) (if equipped). Remove clip (13) and tube assembly (10). Remove bolt (14) and disconnect dipstick tube (15) .

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Illustration 5	g01441002

7. Disconnect tube assemblies (19) and (20) from the engine. Remove three bolts (16) and four bolts (17). Remove filter base (18) .

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Illustration 6	g01441081

8. Remove plug (21) from the power train oil cooler. Drain the coolant from the cooling system into a suitable container for storage or disposal. Install plug (21) .

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Illustration 7	g01441080

9. Remove four bolts (22) and bracket (23) .

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Illustration 8	g01441083

10. Remove six bolts (24) .

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Illustration 9	g01441473

11. Remove four bolts (28). Remove four bolts (30) and elbow (29) .

12. Remove six bolts (27) (not shown). Position hose assembly (11) and the clip out of the way (if equipped).

13. Remove six bolts (26) and bonnet (25) .

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Illustration 10	g01441094

14. Remove four bolts (31). Remove four bolts (33) and elbow (32) .

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Illustration 11	g01441095

15. Attach a suitable lifting device to brake oil cooler (34). The weight of brake oil cooler (34) is approximately 57 kg (125 lb).

16. Remove six bolts (35) and brake oil cooler (34) .