120M and 12M Motor Grader Machine Systems Caterpillar

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.

Note: Check the seals for wear or for damage. Replace the components, if necessary.

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Illustration 1	g01397485

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Illustration 2	g01397459

1. Install Tooling (A) and support Tooling (A) with a suitable lifting device. Use Tooling (A) in order to install bearings (30).
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   Illustration 3	g01397451

2. Use Tooling (C) in order to install lip seals (29).
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   Illustration 4	g01397448

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   Illustration 5	g01397493

3. Use Tooling (B) in order to install bearings (28).

4. Install seals (26) and washers (25). Use two people in order to install yoke (27) on blade lift arm (12). The weight of yoke (27) is approximately 23 kg (50 lb).

5. Install shims (24). Use shims (24) in order to obtain a maximum end play of 0.254 mm (0.0100 inch). Yoke (27) must rotate freely. Install seal (23).

6. Install retainer (22) and bolts (21). Tighten bolts (21) to a torque of 115 ± 10 N·m (85 ± 7 lb ft).
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   Illustration 6	g01397310

7. Attach a suitable lifting device to blade lift arm (12). The weight of blade lift arm (12) is approximately 113 kg (250 lb). Use the suitable lifting device in order to position blade lift arm (12).

8. Position four thrust washers (16) (not shown).

   Note: The gap between blade lift arm (12) and the frame should not be over 1.00 mm (0.039 inch).

9. Install pin (19).

10. Install lock (18) and bolts (17).

11. Position the plate and install bolt (20). Tighten bolt (20) to a torque of 115 ± 10 N·m (85 ± 7 lb ft).
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    Illustration 7	g01397275

12. Install pin (14) into blade lift arm (12).

13. Install lock (15) and bolts (13).
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    Illustration 8	g01429736

14. Attach a suitable lifting device to centershift cylinder (8).

15. Use the machine in order to position centershift cylinder (8).

16. Install cap (10) and bolts (9).
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    Illustration 9	g01397240

17. Attach a suitable lifting device to blade lift cylinder (4). The weight of blade lift cylinder (4) is approximately 91 kg (200 lb).

18. Use the suitable lifting device in order to position blade lift cylinder (4) onto front frame assembly (6).

19. Install caps (7) and bolts (5).

20. Install plate (3).
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    Illustration 10	g01415674

21. Position cover (1) onto the machine.

22. Install bolts (2). Repeat for the opposite side of the machine.

End By:

1. Disconnect the steering frame lock. Refer to Disassembly and Assembly, "Steering Frame Lock - Separate and Connect".