120M Series 2 and 120M2 Motor Graders Machine Systems Caterpillar

Removal Procedure

Start By:

1. Connect the steering frame lock.

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Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed. Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death. Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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Illustration 1	g06287257

1. Position drawbar (1) to the left side of the machine. Position the blade onto suitable cribbing. Support the circle with Tooling (A) as shown. Refer to Tool Operating Manual, NEHS1303, "Lift Group (Stand - 25 Ton)" for more information on Tooling (A).

2. Stop the engine.

3. Refer to Operation and Maintenance Manual, "System Pressure - Release".
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   Illustration 2	g01403317

4. Attach Tooling (B) and a suitable lifting device to swivel (3). The weight of swivel (3) is approximately 41 kg (90 lb).

5. Disconnect hose assemblies (2), (5), and (6).

6. Remove bolts (7) and lower swivel (3).

7. Remove the suitable lifting device.

8. Remove all clamps (4) that connect hose assemblies (6) to the drawbar.
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   Illustration 3	g02731796

9. Remove centershift cylinder (8).

10. Remove bolts (10), cap (9), and the shims. Repeat this step for the opposite side of the machine.

    Note: Note the number and the location of the shims.

11. Use the hydraulics to retract the blade lift cylinders.

    Note: Secure the blade lift cylinders to the front frame.

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    Illustration 4	g01403404

12. Loosen nuts (11).

13. Loosen set screws (12).

14. Remove bolts (13).

15. Remove shoe (14) and wear strip (15).

    Note: Note the location of the shoes.

16. Repeat Steps 12 through 15 for the remaining shoes.
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    Illustration 5	g02731800

17. Attach a suitable lifting device to drawbar (1).

18. Remove bolts (16).

19. Remove drawbar (1). The weight of drawbar (1) is approximately 907 kg (2000 lb).
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    Illustration 6	g01403436

20. Remove bolts (22).

21. Remove adapter (17) and shims (18) from drawbar (1).

22. Remove bolts (19) and ball (20). Remove adapter (21) from drawbar (1).

23. If necessary, remove the circle drive.