12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Caterpillar

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Start By:

a. remove steering, wheel lean, blade lift, blade centershift, blade sideshift, blade tip or articulation cylinder

NOTE: Some machines are not equipped with blade sideshift or blade tip cylinders.

1. Remove the seals and the bearings from the cylinder rod and the cylinder, if the cylinder is so equipped.

2. Fasten a hoist to the cylinder. Put the cylinder in position on tool (A) with the oil openings down.

3. Remove head (2) from the cylinder (3) with tooling (B).

4. Remove cylinder (3) from over the head (2), piston (4), and rod (1).

5. Remove the bolt (6) and washer (5) from the rod (1).

6. Remove piston (4) from the rod (1).

7. Remove head (2) from the rod (1).

8. Remove seal assembly (8) and ring (7) from the piston (4).

9. Remove seal (9) and ring (10) from head (1). Remove seals (12), (13) and (14) from head (1). Remove ring (11) from the head.

NOTE: Ring (11) is not used in the steering cylinders.

10. Inspect all parts and install new parts as needed.

Assemble Hydraulic Cylinders

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1. Put SAE 10 oil on the seals. Use tool (C) and install seals (12), (13), (14) and ring (10) in head (1).

NOTE: Install seal (13) with the lip toward the inside of the head. Install seal (12) with the lip toward the outside of the head.

NOTE: Ring (11) is not used on the steering cylinders.

2. Install ring (10) and seal (9) with the ring toward the outside of the head.

3. Install ring (7) and seal (8) on piston (4).

NOTE: Tooling (D) can be used to make the seal larger so it will go over the piston.

4. Position head (2) and piston (4) on rod (1).

5. Put 2P2506 Thread Lubricant on the threads of the bolt. Install the washer (5) and the bolt in rod (1). Tighten the bolt to 570 ± 80 N·m (420 ± 50 lb.ft.).

6. Lubricate threads with clean grease and tighten head (3) to a torque of 600 ± 130 N·m (440 ± 95 lb.ft.).

7. Fasten a hoist to the cylinder. Remove the cylinder from tooling (A).

8. If the cylinder is equipped with seals and bearings, install a new seal in each end of the cylinder with tooling (F).

NOTE: Install the seals with the lips even with, and toward the outside surface of the cylinder.

9. Install a new bearing in each end of the cylinder with tooling (E).

NOTE: Install the bearing so it just makes contact with the seal.

10. Install another seal in each end of the cylinder in the same manner outlined in Step (8).

End By:

a. install steering, wheel lean, blade lift, blade centershift, blade sideshift, blade tip, or articulation cylinder