RING-RETAINING 6L9721 - Caterpillar

Secondary Steering System - This machine may be equipped with a secondary steering system.The secondary steering system consists of a redundant steering pump to provide hydraulic oil flow in the event of a primary steering pump failure.REDUNDANT STEERING PUMP SYSTEM - This system adds an electric steering pump to provide flow in the event of a primary pump failure or unexpected loss of engine speed.Note: The system will perform a functional test of the redundant steering pump at every machine start. The secondary system indicator will turn amber indicating a test is being performed. If the system does not function as expected, the alert indicator will come on and the action alarm will sound. Do not operate the machine if the system does not pass the functional test.If the system detects a loss of primary pump pressure, the redundant steering pump system will also engage.Once the redundant steering pump has been activated, the electric motor will remain active until one of the following occurs:
the machine is turned off
the machine speed is zero and the engine is not runningNote: If the redundant steering pump system is activated for more than 1 minute, replace the pump, the motor, and the solenoid. Inspect the wiring for any damage.
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.
Once the secondary steering pump has been activated, the system should remain ON no more than 1 minute. Safely steer the machine to a stop immediately. Turn the key start switch to the OFF position in order to turn OFF the secondary steering pump. Prolonged use of the secondary steering pump will overheat the electric motor and damage the components.
Secondary Steering Indicator - This alert indicator will be amber in color when the secondary steering system is active or the secondary steering system is being tested.The Monitoring Display System is used to test the secondary steering manually. Refer to the Operation and Maintenance Manual, "Secondary Steering - Test" for the procedure.