LINER AS-CAB 3829348 - Caterpillar

Illustration 1 g00500963
Steering check
(A) Diameter of the turn
Measure distance (A). See Illustration 1. Distance (A) should be 1.2 to 1.8 m (3.9 to 5.9 ft).
Repeat Steps 2 through 7 with the steering control handle in the STEER RIGHT position.
If the distances in Steps 7 and in 8 are within the specification, the steering hydraulic system is operating correctly. If the distances in Steps 7 and 8 are not within the specification, proceed to Step 10.
Refer to Troubleshooting, RENR8056, "Steering System" in order to help diagnose the steering system. Sprocket Speed Check
Note: The check should be used primarily in a shop area after the machine has been repaired or after the machine has been rebuilt.
Move the machine to a clear area that is level. Lower the implements to the ground. Stop the engine.
Separate the tracks. Remove the tracks from the sprockets on the final drives. Reference: Refer to Disassembly and Assembly, "Track - Separate" in the Service Manual for your machine.
Before you do the checks, mark the sprockets of both final drives in order to count the revolutions during the checks.
Start the engine. Operate the engine at HIGH IDLE.
Release the parking brake. Move the steering control lever to the end of the travel in the STEER RIGHT position. Move the transmission to NEUTRAL.
This step checks the oil flow through the steering system. Use a stopwatch to count the number of revolutions accurately per minute of each sprocket. Add the rpm of the right sprocket to the rpm of the left sprocket. The sum of the rpm of the left sprocket and of the right sprocket should be 25.75 1.25 rpm.
Table 12
A Check of the Sprocket Speeds for Steering Oil Flow
Rpm of left sprocket 12.5 rpm
Add rpm of right sprocket. + 13.5 rpm
Sum of the rpm of the sprockets = 26.0 rpm
To check the mechanical drag balance between left and right sprockets, subtract the left sprocket speed from the right sprocket speed. The difference 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 25.75 1.25 rpm.
If the sprocket speeds are not within the tolerances, check the operation of the components. Also, check the adjustment of the tiller handle. 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 had been indicated by the checks, use Diagnostic Instrument Tests to get a more accurate indication of the location of the specific problem.
If the values in Steps 5, 6, and 7 for STEER RIGHT and for STEER LEFT are within the specification, perform the following calculation in order to check the steering balance: With the values from Step 5, add the value for STEER LEFT to the value for STEER RIGHT. The sum should be 0 1.1 rpm.
If the sum