TUBE 2057927 - Caterpillar

Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine.To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations and mandates.
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Steering Control Valve (1) End Cover. (2) Shims.To check the steering time, position the machine on a dry, hard surface that is level. Run the engine at high idle. Raise the bucket approximately 305 mm (12.0 inch) above the ground. The time for a full turn from one stop to the other stop should be 4 to 5 seconds.The difference between the time for a right turn and the time for a left turn must not be more than 1 second.If the steering times are not within the specifications, perform the following procedure:
Check the pressure of the oil in the lines from the steering pilot valve to the steering control valve.
If the pressures are equal, refer to the adjustment procedure for the steering time.
If the pressures are not equal, check the STIC for proper movement and clearance. If the STIC is functioning properly, the problem is with the steering pilot valve.Adjustment Procedure for the Steering Time
If the steering times are not within specifications, perform the following adjustment procedure:
Remove end cover (1) from the steering control valve.
Add shims (2) in order to decrease the steering time for a right turn. Therefore, the machine will be turned to the right faster. This will cause the steering time for a left turn to increase. The machine will be turned to the left more slowly.If some of shims (2) are removed, the results will be the opposite. Use enough shims so that the steering times are nearly identical.
The 8B-3115 Shims (2) are 0.25 mm (.010 inch) thick. With the engine at high idle, two shims (2) will change the steering time by approximately .1 second.
Replace end cover (1) on the steering control valve.Refer to the following example. A check of the steering times indicate that the time for a right turn is .4 seconds longer than the time for a left turn. Shims (2) must be added in order to decrease the difference between the two steering times. The addition of four shims will decrease the time for a right turn by approximately .2 seconds. This will also increase the time for a left turn by approximately .2 seconds. After you add the four shims, the time that is required for a