TH103, TH62, TH63, TH82 and TH83 Telehandlers Longitudinal Stability Indicator System Caterpillar

The switches that are located on the back of the display module must be correctly set before you attempt to calibrate the system. Refer to Testing and Adjusting, "Display Module - Replace".

The switches that are located on the boom must be correctly adjusted before you attempt to calibrate the system. Refer to Testing and Adjusting, "Switch (Boom) - Adjust".

There is one switch on TH62, TH63, TH82 and TH83 machines. The switch is a mechanically operated switch that has contacts.

There are two switches on TH103 machines. The switches are proximity switches.

Use the procedure that follows to calibrate the system. The machine must be parked on firm level ground.

1. Turn the engine start switch to the ON position.

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Illustration 1	g00710047

2. Press "TEST" switch (11) and press "DUTY" switch (12) at the same time. Check the indicators that are illuminated.
   • If indicator (1) is illuminated, this indicates that the system has been derated. This indicator is green.

   • If indicator (6) is illuminated, this indicates that the display module has been set for a TH62 machine. This indicator is green.

   • If indicator (7) is illuminated, this indicates that the display module has been set for a TH82 machine. This indicator is amber.

   • If indicator (8) is illuminated, this indicates that the display module has been set for a TH63 machine. This indicator is amber.

   • If indicator (9) is illuminated, this indicates that the display module has been set for a TH83 machine. This indicator is red.

   • If indicator (10) is illuminated, this indicates that the display module has been set for a TH103 machine. This indicator is red.

   • If all indicators are illuminated, this indicates a fault.

   The correct indicators must illuminate for your machine. Proceed with the calibration procedure when you are satisfied.

3. Start the engine. The conditions that follow must exist.
   • the engine must be operating at low idle.

   • the boom must be fully retracted.

   • the display module has been set to provide indications that are correct for operating the machine when the stabilizers are raised.

   • a work tool is not attached to the coupler.

   • the bottom of the coupler is 150 mm (6 inch) above the ground.

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Illustration 2	g00747763

4. Push button (15) that is marked "CAL" and release the button. The button is located on the right side of the display module. Indicator (1) and indicator (9) must flash. Indicator (1) is green. Indicator (9) is red.

5. Push button (11) that is marked "TEST" and release the button. Indicator (1) must illuminate continuously for two seconds. The alarm must sound once. After indicator (1) has been illuminated for two seconds and after the alarm has sounded once, indicators (1) and (9) must flash again.

6. Pick up an appropriate work tool. The work tool must be of a type that will allow you to load the work tool enough to tip the machine forward. Refer to Operation and Maintenance Manual, SEBU7370, "Quick Coupler (Hydraulic)" if you are working on a TH62, TH63, TH82 or a TH83 machine. Refer to Operation and Maintenance Manual, SEBU7371, "Quick Coupler (Hydraulic)" if you are working on a TH103 machine.

7. Refer to the appropriate load chart. Pick up a load that is heavy enough to tip the machine when the boom is fully extended. The load must be heavy enough to tip the machine when the boom is fully extended in order to obtain the correct calibration.

8. Extend the boom. Keep the bottom of the coupler 150 mm (6 inch) above the ground. Continue to extend the boom in this way until the machine tips forward. The rear wheels must be off the ground.

9. Wait for about 15 seconds until the machine is not rocking. The machine must not be rocking or vibrating.

10. When the machine is not rocking or vibrating, press button (16) that is marked "SPAN+%". The button is located on the right side of the display module. Indicator (10) must illuminate and the alarm must sound three times. Indicator (10) is red. After indicator (10) has illuminated and after the alarm has sounded three times, indicators (1) and (9) must flash again. This sequence indicates that calibration has been successful.

11. Push button (15) that is marked "CAL" and release the button. This action takes the display module out of calibration mode. All indicators will illuminate and the alarm will sound. Calibration of the system is now complete.

12. Retract the boom. The rear wheels will come back into contact with the ground. Leave the load in place on the work tool.

13. Carefully extend and retract the boom while you observe the display module. Ensure that the display module gives the readings that are expected. Refer to Systems Operation, "Display Module".

14. Set down the load that is on the work tool and disengage the work tool from the load.

15. Retract the boom. Lower the work tool to the ground and stop the engine. Turn the engine start switch to the OFF position.