R2900G Load Haul Dump Steering System Caterpillar

Reference: For the correct procedure to check the steering time, refer to System Operation, Testing and Adjusting, "Steering Time - Check" for the machine that is being serviced.

Illustration 1	g01050342
Steering control valve (1) Cylinder flow shims (2) End cover (3) Flow balance shims

Steering Time Adjustment

1. Remove end cover (2) from the steering control valve.

2. Add flow balance shims (3) to decrease the right turn time (steer faster) and increase the left turn time (steer slower). If the flow balance shims are removed, the result is opposite.

3. The 8B-3115 Shim are 0.25 mm (0.010 inch) thick. Two shims will change the steering time at high idle by approximately 0.1 second.

4. Install end cover (2) to the steering control valve.

Example: A check of the steering times shows that the right turn time is 0.4 second more than the left turn time. Flow balance shims (3) must be added to decrease the difference between the times.

The addition of four shims will decrease the right turn time by approximately 0.2 second and increase the left turn time by approximately 0.2 second. This will make the right and left turn time approximately the same.

Reference: For the correct procedure to check the steering time, refer to Systems Operation, Testing and Adjusting, "Steering Time - Check" for the machine that is being serviced.

Cylinder Flow Adjustment

Both steering times (right and left) must be 3.0 ± 0.2 seconds. If they are not, cylinder flow shims (1) must be added or removed.

1. Remove end cover (2) from the steering control valve.

2. Add shims (1) to decrease both steering times. If an increase in the steering times is required, remove shims.

   The 8M-8211 Spacer is 0.25 mm (0.010 inch) thick. Three shims will change the steering times at high idle by approximately 0.06 second.

   The 7M-8538 Spacer is 0.90 mm (0.036 inch) thick. Three shims will change the steering times at high idle by approximately 0.2 second.

3. Install end cover (2) to the steering control valve.

   Reference: For the correct procedure to check the steering time, refer to Systems Operation, Testing and Adjusting, "Steering Time - Check" for the machine that is being serviced.