DRIVE GP-TACHOMETER 4W0313 - Caterpillar

The service brake must be checked in order to ensure proper operation before you test the supplemental steering system.Personal injury, death, or property damage could occur if the supplemental steering system is tested and the service brake is not operational.Test the service brake before you test the supplemental steering system.
Perform the following procedure in order to test the secondary steering system. System includes the redundant control system on machines equipped with EH steering, and if equipped, the redundant steering pump system. The procedure may be required by local regulations.Ensure that there are no hazards in the test area. The test area must be unobstructed and level. Operate the machine in second gear.Ensure that all accumulators are properly charged. Ensure that there is no load in the work tool. Position the machine with the bucket or the work tool in the carry position with the machine in neutral.The redundant steering pump is an electrical driven pump (if equipped). The pump should be tested by running the redundant steering test through the display. This test will test the redundant steering pump (if equipped) and the redundant steering control valves (if equipped).
If the secondary steering activates during operation, immediately park the machine in a safe location. Inspect the machine and correct the condition which caused the secondary steering to activate.Do not continue to operate the machine when the secondary steering is active.Personal injury or death can occur if steering is lost completely during operation.The batteries must have a normal charge. The secondary steering electrical system must be in proper working condition. A low battery, or any defect in the battery, battery cells, or electrical circuit can cause loss of secondary steering. Personal injury and/or damage to the machine can occur.
Note: Before the test for the secondary steering is performed, the machine must meet the following conditions:
If equipped with the Left Hand Steering Control, the left-hand armrest must be down and latched.
The engine must be operating.
The parking brake must be engaged.
The transmission control must be in NEUTRAL.
The area around the front wheels must be clear of obstacles and personnel.Note: Verify that the secondary steering indicator is on and amber in color throughout the test. The light ensures that the test is actually being activated. If the secondary steering indicator does not turn on amber in color, verify that the initial conditions are met.
Select the secondary steering test in the Graphical Display. The test is located in the "Service" section under "Functions". The test will automatically begin and run for a duration of 10 seconds.
If equipped with a redundant steering pump, the pump will activate of a duration of up to 10 seconds. During that time, the system will measure and confirm the pressure provided by the redundant pump is within specifications.
To verify functionality of the redundant control system, provide the following steering inputs and confirm that the movement of the machine aligns to each input while the test is running:
Steer left
Steer center
Steer right Note: If the wheels do not move according to