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The machine's batteries must have a normal charge and the secondary steering electrical system must be okay. A low charge condition, or any defect in the battery, battery cells, or electrical circuit can cause loss of secondary steering and could result in personal injury and/or damage to the machine. |
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Once the secondary steering system has been activated, it should remain ON no more than one minute. This should be sufficient time to safely steer the machine to a stop. When the machine is stopped, turn the key start switch to the OFF position in order to turn OFF secondary steering. Prolonged use of the secondary steering system will cause the electric motor to overheat and cause damage to it's components. |
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| Illustration 1 | g01374218 |
| (1) Transmission/chassis electronic control module (ECM) | |
Transmission/chassis ECM (1) is the central processing unit for the secondary steering system.
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| Illustration 2 | g01374220 |
| (2) Pressure sensor | |
Transmission/chassis ECM (1) receives electrical input signals from the implement electronic control module (ECM 1) and the engine electronic control module (ECM). The engine ECM receives a signal from the engine speed sensor once the engine is started.
Pressure sensor (2) measures the pressure of the hydraulic oil in the control manifold. Pressure sensor (2) transmits a signal to the implement ECM 1. Implement ECM 1 sends a signal to transmission/chassis ECM (1). If the pressure is too low, transmission/chassis ECM (1) uses the signal from the pressure sensor to turn the secondary steering pump ON. Transmission/chassis ECM (1) will then assume a pump failure or engine failure has occurred.
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| Illustration 3 | g01374227 |
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(3) Dash and indicators
(4) Action light (5) Warning light (6) Alert indicator for the secondary steering system | |
Failure of the primary steering causes the following event to be activated automatically:
- Warning light (5) will come on red in color.
- Pressure sensor (2) measures the pressure of the hydraulic oil in the control manifold.
- Pressure sensor (2) transmits a signal to implement ECM 1.
- Implement ECM 1 transmits a signal to transmission/chassis ECM (1).
- If the pressure is too low, transmission/chassis ECM (1) uses the signal from the pressure sensor to turn the secondary steering pump ON.
- Transmission/chassis ECM (1) will then assume a pump failure or engine failure has occurred.
- Transmission/chassis ECM (1) will send an electronic signal to the magnetic switch in order to activate the electric drive motor.
The secondary steering pump and the secondary steering pilot valve may be tested manually by holding the secondary steering test switch in the TEST position while the machine is stationary with the parking brake ON. Holding the test switch will run the secondary steering pump for maximum 10 second intervals.
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| Illustration 4 | g01374222 |
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(7) Electric drive motor
(8) Electric drive pump (9) Magnetic switch | |
Note: Use the above frame assembly for reference only.
The engine start switch must be ON and the engine must be running in order for the secondary steering test switch to function. The battery disconnect switch must be in the ON position in order for the secondary steering test switch to function. Holding the secondary steering test switch in the TEST position causes the following events:
- Closing of magnetic switch (9)
- Turning on of the electric drive motor (7)
- Turning on of the electric drive pump (8)
During the test, alert indicator (6) will be amber in color if the test is successful. If alert indicator (6) turns red in color the test has failed and a warning level 3 will be issued. When the test is finished alert indicator should turn OFF.
Reference: Refer to the electrical schematic for your machine for more information on the secondary steering electrical system.