69D and 769D Off-Highway Trucks and 771D Quarry Truck Steering System Caterpillar

Illustration 1	g00285495
Steering linkage (1) Clamps on left side tie bar (2) Clamps on right side tie bar (B) Distance between the front tires at the back (F) Distance between the front tires at the front

Use the following procedure to adjust the front wheel alignment:

1. Raise the axles until the strut rods in the suspension cylinders are fully extended.

2. Move the wheels to a straight ahead position.

3. Measure the distance between the front wheels at location (F) .

4. Mark location (F) at each tire. Rotate the tires by 180 degrees.

5. Measure the distance at location (B) between the same marks.

6. Use Table 1 to determine the correct toe-out when the front wheels are off the ground.
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   Table 1

   Correct Toe-Out

   B = F - 50.8 mm (2.00 inch)

7. If the difference that was found in the previous step is not correct, adjust each link assembly by the same number of turns.

   Note: After the adjustment has been made, the tie rods must be of equal length.

8. When the Toe-Out measurement is correct, tighten clamps (1) and (2) to 183 N·m (135 lb ft) and lower the front of the truck.

Note: The front wheel toe-in will be correct if the difference between distance (F) and distance (B) is properly adjusted. Also, the suspension cylinders must be properly charged and the suspension cylinders must be at the normal operating range.