623F Wheel Tractor-Scraper Machine Systems Caterpillar

Removal Procedure

1. Park the machine on a hard, level surface. Lower the scraper bowl to the ground and engage the parking brake. Chock the wheels in order to prevent the machine from moving.

2. Start the engine. Extend the load cylinder. Shut off the engine.

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Illustration 1	g00800861

3. Place suitable cribbing between the draft frame and the scraper bowl, as shown. Use Tooling (A) to raise the scraper bowl until the cribbing contacts the draft frame. Make sure that the cribbing is properly seated between the draft frame and the scraper bowl.

4. Lower the load cylinder. Make sure that the rear bracket of the cushion-hitch is resting on the front hitch.

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At operating temperature the implement hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible injury, release the pressure in the implement hydraulic system before hydraulic lines or components are disconnected or removed.

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

5. Put identification marks on all lines, hoses, wires, and tubes for installation purposes. Plug all lines, hoses and tubes. This helps prevent fluid loss and contamination of the oil system.

6. Remove the servo steering cylinder. Refer to Disassembly and Assembly, "Servo Steering Cylinder - Remove and Install" for the appropriate removal procedure.

7. Remove the cushion-hitch accumulator. Refer to Disassembly and Assembly, "Accumulator (Cushion-Hitch) - Remove" for the appropriate removal procedure.

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Illustration 2	g00530943

8. Remove four bolts (1), the washers and two half flanges that secure hose assembly (2) to tube assembly (3). Disconnect hose assembly (2) and the O-ring seal from tube assembly (3). Remove four bolts (4) that secure bracket (5) to the cushion-hitch. Remove bracket (5) from the cushion-hitch.

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Illustration 3	g00530945

9. Remove bolt (6), the washers and the clip that secures tube assembly (7) to the cushion-hitch. Disconnect two tube assemblies (7) from the cushion-hitch. Disconnect two lubrication lines (8) from the cushion-hitch. Remove 11 bolts (9) and the washers that secure two retainers (10) to the cushion-hitch. Remove two retainers (10) from the cushion-hitch.

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Illustration 4	g00530946

10. Disconnect two lubrication lines (11) from the cushion-hitch. Remove 12 bolts (12) and the washers that secure two retainers (13) to the cushion-hitch. Remove two retainers (13) from the cushion-hitch.

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Illustration 5	g00530948

11. Remove bolt (14) and the washer that secures clip (15) to the bracket. Move clip (15) and the lubrication lines away from the bracket. Remove bolt (16) and the washers that secure two clips (17) to the cushion-hitch. Move the two clips (17) and the lubrication lines away from the cushion-hitch.

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Illustration 6	g00530950

12. Remove two bolts (18) and the washers that secure two clips (19) to the cushion-hitch. Move two clips (19) away from the cushion-hitch. Disconnect four lubrication lines (20) from the cushion-hitch. Remove the cotter pin that secures pin (21) to spring (22). Remove pin (21) from spring (22). Remove 10 bolts (23) and the washers that secure two retainers (24) and spring (22) to the cushion-hitch. Remove two retainers (24) and spring (22) from the cushion-hitch. Move lubrication lines (20) away from the cushion-hitch.

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Illustration 7	g00530952

13. Disconnect three hose assemblies (25) and the O-ring seals from tube assemblies (26). Remove two bolts (27) and the washers that secure bracket (28) to the cushion-hitch. Move bracket (28) away from the cushion-hitch. Disconnect two lubrication lines (29) from the cushion-hitch. Remove 12 bolts (30) and the washers that secure two retainers (31) to the cushion-hitch. Remove two retainers (31) from the cushion-hitch.

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Illustration 8	g00530953

14. Install Tooling (B) between the cushion-hitch and the frame. Make sure that the tooling is tight against the cushion-hitch and the frame.

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Illustration 9	g00530954

15. Install Tooling (C) to the cushion-hitch, as shown. Attach two nylon lifting straps and a hoist to upper link assembly (32). Use Tooling (C) to remove the pin and the thrust washers that secure the load cylinder to the cushion-hitch. Repeat the procedure for the other pin. Remove upper link assembly (32) from the cushion-hitch. The link assembly weighs 73 kg (161 lb). Remove the tooling from the link assembly.

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Illustration 10	g00530955

16. Attach a nylon lifting strap and a hoist to the load cylinder, as shown.

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Illustration 11	g00533970
The hydraulic hoses were removed for photographic purposes.

17. Remove four bolts (33), the washers and two half flanges that secure hose assembly (34) to load cylinder (35). Disconnect hose assembly (34) and the O-ring seal from load cylinder (35). Disconnect hose assembly (36) and the O-ring seal from load cylinder (35) .

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Illustration 12	g00530957

18. Use Tooling (D) to remove pin (37) and the thrust washers that secure load cylinder (35) to the cushion-hitch. Remove load cylinder (35) from the cushion-hitch. The load cylinder weighs 52 kg (115 lb).