Elliott Digger Derrick, Operation & Maintenance Manual, Page: 296 / 376

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W450321A 09/12
5.4 Calibrating the Extension Sensor Zero
The reeling drum must be installed on the machine, the cable tied-off and the potentiometer set to a
starting point for the zero.
1. Fully retract the boom and lower to “0.0” while using a digital level.
2. Remove the cover from the reeling drum to expose the baseplate sensor assembly.
3. Rotate the extension sensor gear clockwise until the clutch drags/clicks and rotate a ½ turn
counterclockwise.
4. The voltage reading between the blue wire and the white wire on the terminal block should
measure 0.15 to 0.35 volts. If outside this voltage, rotate the gear to attain proper voltage with
the boom fully retracted.
5. Press the “Menu Up” button until “02 Zero Sensors” is reached.
6. Press the “02 Zero Sensors” button one time and the screen should appear as shown.