FILM-SELECTOR 4615159 - Caterpillar

Table 1
A Check of the Sprocket Speeds for Steering Oil Flow    
Rpm of left sprocket         14.0 rpm    
Subtract rpm of right sprocket.     +     15.0 rpm    
Difference of the rpm of the sprockets     =     29.0 rpm    
To check the mechanical drag balance between left and right sprockets, subtract the left sprocket speed from the right sprocket speed. The sum should be 0 3.5 rpm.
Do Steps 5 through 7 again with the steering control lever in the STEER LEFT position. The sum of the sprocket speeds for the full STEER LEFT position should be 28 1.25 rpm.
If the sprocket speeds are not within the tolerances, check the operation of the components. Also, check the steering pilot valve for proper adjustment and proper alignment. If Step 6 is low, check the engine rpm. If Step 7 is out of tolerance, excessive mechanical drag may be present in the differential steering and/or in the final drives.
If a problem was indicated by the checks, perform the instrument tests in order to more specifically identify the location of the problem.
If the values in Steps 6, 7, and 8 for STEER RIGHT and for STEER LEFT are within the specification, perform the following calculation in order to check the steering balance: Add the value for STEER LEFT to the value for STEER RIGHT. Use the values from step 6 for this calculation. The difference should be 0 1.1 rpm.
If the value in Step 11 is not within the specification, the steering to the right and to the left is not equal. Check that the displacement of the pump to the right and to the left is equal. The problem may be caused by a misadjusted pump control or by a faulty pilot control valve.
When the checks and the adjustments are complete, stop the engine. Remove all test equipment and connect the track.Reference: Refer to Disassembly and Assembly, "Track - Connect" in the Service Manual for your machine.