The secondary steering system provides a backup steering system if the primary steering system fails. The secondary steering system consists of an electric motor driven gear pump that supplies oil for steering system in case of primary steering pump failure. If equipped, the system will perform a secondary steering pump test during engine startup. The Monitor Display is used in order to test the secondary steering system manually. The secondary steering indicator will illuminate, the action alarm will not sound during the test.
An alert indicator indicates a failure of the primary steering. When the alert indicator flashes, the secondary steering system is active. When the alert indicators come on and the action alarm sounds, steer the machine immediately to a convenient location and stop the machine. Stop the engine and investigate the cause of the failure. Do not operate the machine until the cause of the failure has been corrected.
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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. |
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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 System - This machine may be equipped with a secondary steering system.
The attachment configuration has a check valve manifold that resolves the pressure between primary and secondary steering system. This resolved pressure is sensed by a single pressure sensor. The arrangement also has a secondary steering pump which is an electric motor driven gear pump. The electric motor is powered by batteries using relay.
The optional secondary steering pump will activate automatically when the main pump loses pressure, such as a steering pump failure or engine failure. The redundant steering control will activate automatically when the primary steering control system fails. The transition from the primary steering to the secondary steering will occur in less than 2 seconds. The transition will vary depending on the speed of the machine. As the machine speed increases, the transition time decreases. When the secondary steering system is activated, maintain deliberate, controlled movement of the steering inputs to maintain the desired direction of travel.
Note: If the secondary steering system is activated for more than 1 minute, replace the pump, the motor, and the solenoid. Inspect the wiring for any damage.
Once the secondary steering pump motor has been activated, the motor will remain active until one of the following occurs:
- the machine is turned off
- the machine speed is zero and engine is not running
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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.