Zoomlion ZT20J, Service And Maintenance Manual

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5-21
a. Set the device to the following status position:
1) Boom-lower.
2) Telescopic-retract.
3) Jib-adjusted to 0 °.
4) Turntable-turn to 0 °.
5) Platform level-level to 0 °.
6) Platform Rotation-Rotate to 0 °.
7) Load in platform-remove all load items.
8) The machine is on a hard, level surface.
b. Start the ground and platform emergency stop switches and turn the key switch to the platform
position.
c. Remove all payloads from the work platform, including the operator.
d. At this time, the load cell can be adjusted to calibrate the zero position of the weighing.
e. After calibrating the zero point position, increase the load on the work platform to 454kg/1000lb to
full load.
f. Under the overload condition, the overload indicator of the platform and the ground is continuously
lit, and the alarm is issued.
g. Remove load items from the platform.
h. The load cell adjustment is completed.
5.4 Boom Tilt Sensor Check
a. Keep the working platform unloaded.
b. Retract the boom to the extreme position and raise the boom to a horizontal position.
c. Use an angle tester to measure the boom angle to zero degrees and calibrate the zero position of the
boom angle sensor.
d. Confirm that the angle of the boom on the display is zero degrees.
e. Ground mode operates the boom lifting function, and the boom angle value on the display changes.
5.5 Calibration of boom length sensor
a. Keep the working platform unloaded.
b. Lift the boom to the horizontal position, and retract the boom to the extreme position.