CASE-DIFFERENTIAL 4790971 - 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 if your machine is equipped with a ground driven supplemental steering and if the procedure is required by local regulations.Ensure that the engine has been operating at low idle for a minimum of 5 minutes.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 air tanks and 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. Apply the service brakes and put the engine at low idle. Ensure that The area around the machine is clear of personnel. Release the parking brake. Shift the transmission to second gear forward and slowly release the service brakes. Moderately increase the engine speed to high idle. Shift the transmission to neutral and release the pedal. Turn the ignition to the STOP position. Allow the machine to coast.Note: If the neutral coast inhibit feature is enabled, the machine will not shift into neutral at machine ground speeds above 8 km/h (5 mph). Reduce the machine speed in order to shift into neutral.While the machine is in motion, turn the machine to the left and to the right. If the machine responds to the steering input, the supplemental steering system is operating. Stop the machine with the service brakes. Apply the parking brake. The machine can then be returned to normal operation.If there is no response to the steering input, the supplemental steering system is not operating. Stop the machine immediately. Repair the supplemental steering system before returning the machine to service.