Perform the remainder of the steps in the "General Test Procedures" section when the performance of the system follows: Step 1, Step 2, Step 3 and Step 4. Perform the steps in the "Three Second Powerup Test is OK" section when the performance of the system in the "General Test Procedures" section does not follow: Step 4, Step 5, Step 6 and Step 7
Proceed to the Testing and Adjusting, "Hydraulic System Troubleshooting" section, when the system performs all of the instructions in the "General Test Procedures" section, and the problem still exists.
General Test Procedures
- Turn battery disconnect switch (1) to the ON position.
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| Illustration 1 | g00864862 |
Rear compartment on left side of machine (1) Battery disconnect switch | |
- Turn the engine start switch to the ON position.
Note: The secondary steering system will not function unless battery disconnect switch (1) and the engine start switch are in the ON position.
- Warning light (4) and action light (2) should flash until the engine is started. Warning light (4) should stay on for three seconds and electric drive (8) should run for three seconds.
Note: This three second period is referred to as the three second powerup test.
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| Illustration 2 | g00924533 |
Instrument panel (2) Action light (3) Panel for the indicator lights (4) Warning light (5) Monitoring panel | |
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| Illustration 3 | g00938775 |
View from the left side under the operator platform (6) Pressure switch (7) Pump (8) Electric drive | |
- Start the engine. After the three second period, warning light (4) turns off and action light (2) turns off.
Note: Warning light (4) is located on monitoring panel (5). Action light (2) is located on the panel for the indicator lights (3). The secondary steering test switch is a spring loaded switch. When the secondary steering test switch is not being pressed, this switch rests in the NORMAL position.
- Turn off the engine. Turn the engine start switch to the ON position. Warning light (4) should flash and action light (2) should also flash. Hold the secondary steering test switch in the TEST position. Electric drive (8) should run. The status light should turn on. The operator should be able to steer with a normal amount of effort.
- With the engine at low idle, perform the following steps:
- Depress the transmission modulator pedal.
- Depress the brake pedal.
- Move the transmission direction and speed control to the highest gear.
- Release the transmission modulator pedal.
This procedure will stall the engine. After the engine has stalled, warning light (4) flashes and action light (2) flashes. Also, electric drive (8) starts running and the indicator lamp turns on, after the engine has stalled. The audible alarm will also sound. The operator is able to steer with a normal amount of effort.
- Depress the transmission modulator pedal.
| NOTICE |
|---|
The seconday steering motor should remain on for no more than two minutes. This time period should be sufficient to safely steer the machine to a stop. After the machine has come to a stop, turn the engine start switch to the OFF position. This will turn off the secondary steering system. Prolonged use of the secondary steering system will cause the secondary steering motor to overheat. Overheating will cause damage to the components of the secondary steering motor. |
- Turn the engine start switch to the OFF position. Turning this switch to the OFF position turns off the secondary steering system.
Three Second Powerup Test is NOT OK
Problem
The electrical system is not functioning. The lights do not go on. The action alarm does not sound. The starter does not operate.
Probable Causes
- Battery disconnect switch (1) is in the OFF position.
- The batteries are dead.
Problem
After the engine start switch is turned to the ON position, and before the engine is started, warning light (4) and action light (2) flash. During the three second powerup test, indicator lamp does not turn on and electric drive (8) does not run.
Probable Causes
- Pressure switch (6) has failed. The contacts of pressure switch (6) are stuck in the closed position.
While the engine is off, turn battery disconnect switch (1) to the OFF position. Turn the engine start switch to the OFF position. Disconnect the switch from the harness. Check for continuity across the terminals that are marked "A" and "B" on pressure switch (6). If continuity exists, pressure switch (6) has failed. Replace pressure switch (6).
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| Illustration 4 | g00864891 |
Underneath operator seat inside cab (9) Electronic control module | |
- The wiring harness for pressure switch (6) has shorted to ground between pressure switch (6) and electronic control module (9) .
Troubleshoot this circuit for electrical grounding.
- Secondary steering electronic control module (9) has a 12 -pin receptacle connector. Take measurements at the harness between socket number "1" and socket number "2". The measurements show that there is no voltage to electronic control module (9) .
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| Illustration 5 | g00924469 |
Steering Column in Operator Compartment (10) Fuse for the secondary steering test switch (10A) Fuse for the secondary steering control | |
Make sure that fuse (10) and fuse (10A) are operational. The fuses are located in the fuse panel at the base of the steering column. Make sure that battery disconnect switch (1) is in the ON position. Make sure that the engine start switch is in the ON position. Troubleshoot the supply voltage from the positive circuit of the batteries to electronic control module (9). Then troubleshoot the supply voltage to the negative circuit of the batteries.
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| Illustration 6 | g00864959 |
Right side of rear compartment (11) Magnetic switch | |
- The circuit from pin number "10" of electronic control module (9) to magnetic switch (11) is open, or this circuit is shorted to ground.
Troubleshoot this circuit for grounds or opens. Make sure that the plugs and receptacles at electronic control module (9) are coupled properly.
- The coil of magnetic switch (11) has failed, or this coil has shorted to ground.
While the engine is off, turn battery disconnect switch (1) to the OFF position. Turn the engine start switch to the OFF position. Remove the black electrical wire from the small terminal on magnetic switch (11). Check the coil resistance between the two small terminals on magnetic switch (11). If this coil resistance is less than 5 ohms, replace magnetic switch (11). If this coil resistance is greater than 10 ohms, replace magnetic switch (11) .
- The contacts on magnetic switch (11) are corroded or these contacts are failed open.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the ON position. Hold the secondary steering test switch in the TEST position. Measure the voltage drop across the two large terminals on magnetic switch (11). If the voltage drop is more than 2 volts, magnetic switch (11) has failed. Replace magnetic switch (11) .
- There is an open circuit type failure from the positive circuit of the batteries to the terminal of magnetic switch (11) .
Check the continuity of this circuit.
- There is an open circuit type failure from the terminal of magnetic switch (11) to the terminal of electric drive (8) .
Check the continuity of this circuit.
- There is an open circuit type failure from the terminal of electric drive (8) to the negative circuit of the batteries.
Check the continuity of this circuit.
- Electric drive (8) does not run.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Remove electric drive (8) from pump (7) .
Insert a screwdriver into the slotted motor shaft of electric drive (8) and attempt to rotate this shaft. If this shaft turns freely, turn battery disconnect switch (1) and the engine start switch to the ON position. Hold the secondary steering test switch in the TEST position for only a moment. If electric drive (8) does not turn on proceed to the following step. With the secondary steering test switch in the TEST position, check the voltage of the batteries across the terminals of electric drive (8). If there are 18 volts or more across the terminals of electric drive (8) and electric drive (8) does not turn on, replace electric drive (8) .
- Pump (7) does not operate.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Remove electric drive (8) from pump (7). Check if the pump shaft turns freely. If this shaft does not turn freely, replace pump (7) .
- Electronic control module (9) has failed.
If the above components are operational and the above circuits are functioning properly, replace electronic control module (9) .
Problem
Warning light (4) does not flash during the three second powerup test.
Probable Causes
- The circuit from pin number "11" of electronic control module (9) to warning light (4) is shorted to the ground.
- Electronic control module (9) has failed.
- Warning light (4) has failed.
Problem
The engine start switch is in the ON position. The secondary steering test switch is in the NORMAL position. The status light in the test switch remains on. The electric drive (8) runs continuously.
Probable Causes
- The contacts of magnetic switch (11) are fused together.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Remove the cables from the two large terminals on magnetic switch (11). Measure the resistance across these two terminals. If this resistance is less than 5000 ohms, replace magnetic switch (11) .
- The secondary steering test switch has failed in the NORMAL position.
While the secondary steering test switch is in the NORMAL position, check for continuity through the secondary steering test switch. If continuity exists, replace the secondary steering test switch.
- The coil of magnetic switch (11) is shorted to the positive circuit of the batteries.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Check for continuity between the large, positive side terminal of magnetic switch (11) and either terminal on the smaller coil of magnetic switch (11). If continuity exists, replace magnetic switch (11). If continuity does not exist, troubleshoot the circuit to magnetic switch (11) for a short to the positive circuit of the batteries.
- The circuit from magnetic switch (11) to electric drive (8) is shorted to the positive circuit of the batteries.
Turn battery disconnect switch (1) and the engine start switch to the ON position. Wait for three seconds. Check for voltage at the large terminal on the motor side of magnetic switch (11). If a voltage is measured, troubleshoot the circuit for a short to the positive circuit of the batteries between magnetic switch (11) and electric drive (8). If no voltage is measured, replace electronic control module (9) .
- Electronic control module (9) has failed.
Replace electronic control module (9) .
Problem
While the engine start switch in the ON position, and before the engine is started, the status light in the test switch remains on and electric drive (8) runs continuously.
Probable Cause
- The circuit from terminal "R" on the alternator to socket number "8" of the 12-pin receptacle connector of electronic control module (9) is shorted to the positive circuit of the batteries.
While the engine is off, turn battery disconnect switch (1) to the ON position and the engine start switch to the ON position. There should be no voltage between socket number "8" and socket number "2" of the 12-pin receptacle connector on electronic control module (9). If a voltage is present, check for a short to the positive circuit of the battery. If a short does not exist, the alternator is malfunctioning. Repair the alternator or replace the alternator.
Problem
After the engine start switch is turned to the ON position, and before the engine is started the following set of problems occurs.
- Warning light (4) will flash.
- Status light for the test switch does not go on.
- Action light (2) will flash.
- Electric drive (8) runs for three seconds.
After the engine is started, warning light (4) and action light (2) turn off.
Probable Causes
- The bulb in the status light has failed.
- The circuit is open between magnetic switch (11) and the status light.
- The current limiting resistor has failed.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Check for continuity in the circuit between the terminal for the status light and the large terminal with the small electrical wire on magnetic switch (11). If this circuit is open, repair this circuit or replace this circuit.
Problem
After the engine is started, warning light (4) and action light (2) do not stop flashing. While the engine is running the following problems occur:
- The status light is off.
- Electric drive (8) is off.
- The action alarm is on.
Probable Causes
- The connector at electronic control module (9) is not properly coupled.
- There is no voltage to electronic control module (9). This is measured on the 12-pin receptacle connector from pin number "2" to socket number "3".
- Electronic control module (9) has failed.
- Warning light (4) has failed.
Three Second Powerup Test is OK
Problem
After the engine is started the following problems occur.
- Warning light (4) and action light (2) do not stop flashing.
- The status light is off.
- Electric drive (8) is off.
- The action alarm is on.
Probable Causes
- Electronic control module (9) is not receiving voltage from the terminal "R" of the alternator.
While the engine is running and the connector is disconnected, check the voltage between socket number "8" and socket number "2" of the receptacle. If this voltage is less than 10 volts, check the circuit between this receptacle and the terminal "R" of the alternator for shorts or opens. If this circuit is OK, repair the alternator or replace the alternator.
- The circuit from the socket number "11" of electronic control module (9) to monitoring panel (5) is open.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Disconnect the connector. Check the continuity between socket number "11" and socket number "17". If continuity does not exist, repair this electrical wire or replace this electrical wire.
- Electronic control module (9) has failed.
If the above items are OK, replace electronic control module (9) .
- EMS monitoring panel (5) has failed.
If the above items are operational, replace monitoring panel (5) .
Problem
After the engine is started the following problems occur.
- Warning light (4) does not stop flashing.
- The status light (4) is on.
- Action light (2) does not stop flashing.
- The action alarm is on.
- Electric drive (8) runs.
Probable Causes
- Pressure switch (6) has failed.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Disconnect the connector receptacle from pressure switch (6) .
Turn battery disconnect switch (1) and the engine start switch to the ON position. Start the engine. Measure the resistance across the terminals "A" and "B" on pressure switch (6). If this resistance is greater than 50 ohms, replace pressure switch (6) .
- The hydraulic pressure of the primary steering system is low.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Remove fuse (10) and remove fuse (10A) for the secondary steering system. Turn battery disconnect switch (1) and the engine start switch to the ON position. Start the engine. Turn the steering wheel back and forth for several times. If the machine cannot be steered with a normal effort, the primary steering system has lost hydraulic pressure. Replace the fuses for the secondary steering system. For more information on the hydraulic system, refer to the Testing and Adjusting, "Hydraulic System Toubleshooting" section.
- The circuit from pin number "5" to socket number "2" on the connector for electronic control module (9) is open.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Disconnect the connector on the harness of electronic control module (9). Check the continuity between pin number "5" and socket number "2". If continuity does not exist, check the circuit for opens.
- The circuit is open from pin number "6" to socket number "2" on the connector of electronic control module (9) .
Problem
After the engine has stopped running the following problems occur.
- Electric drive (8) runs.
- Warning light (4) is flashing.
- Action light (2) is flashing.
Probable Cause
- Electronic control module (9) has failed.
Problem
While the engine start switch is in the ON position and the secondary steering test switch is held in the TEST position, warning light (4) does not turn on and electric drive (8) does not run.
Probable Causes
- The secondary steering test switch has failed.
- A fuse is blown.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Remove either electrical wire from a terminal on the secondary steering test switch.
Measure the resistance across the two terminals on the secondary steering test switch. While the secondary steering test switch is in the NORMAL position, this resistance should be greater than 10,000 ohms. While the secondary steering test switch is held in the TEST position, this resistance should be less than 1 ohm. If the secondary steering test switch does not have the above resistances, replacethe secondary steering test switch.
- There is an open in the circuit between the secondary steering fuses and the secondary steering test switch.
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Remove the fuses for the secondary steering system. Disconnect the electrical wires from the terminals of the secondary steering test switch and place these electrical wires to chassis ground. At the holders for the fuses for the secondary steering system, check for continuity to ground. If continuity does not exist, repair the circuit to the secondary steering test switch or replace the circuit to the secondary steering test switch.
- There is an open in the circuit between the secondary steering test switch and magnetic switch (11) .
While the engine is off, turn battery disconnect switch (1) and the engine start switch to the OFF position. Disconnect the electrical wires from the terminals of the secondary steering test switch and place these electrical wires to chassis ground. At the small terminal of magnetic switch (11), check for continuity to ground. If no continuity exists repair the circuit from the secondary steering test switch to magnetic switch (11), or replace the circuit from the secondary steering test switch to magnetic switch (11) .
Refer to the electrical schematic for your machine for further information on the secondary steering electrical system.