NORAC UC5-BC-AL Manual - Manual (Page 53)

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11.5 Boom Stability
The boom is unstable in automatic mode:
 Ensure the sprayer’s boom suspension is operating correctly and moving freely. If the
suspension is sticking or too loose the boom will be unstable. If the boom is unstable in
manual mode, the height control system will not make it more stable.
 If there are friction pads on the boom, ensure they are well greased. Check the boom
damper shocks and replace them if they are worn. If there is substantial wear in the mast-
style main lift the boom will be too loose. Install shims or adjust the mast-style lift if
possible.
 Retune the system. If the hydraulic settings are not calibrated correctly the boom may be
unstable. Perform a Retune and redo the Boom Geometry Test.
 Check the mounting of the roll sensors. They must be mounted for the type of boom
suspension as shown in the installation manual.
 Ensure the height sensors are reading properly and consistently. The sensors must be
aligned and mounted correctly. The sensor should point almost perpendicular to the
ground and there should be no obstructions between the sensor and the ground.
 If your sprayer is equipped with accumulators on the tilt cylinders they should be charged
to the manufacturers specifications. There should also be orifices installed between the
accumulators and tilt cylinders.
The boom(s) move all the way to the top in crop mode:
 The sensors are likely reading off of the boom in crop mode. Ensure the sensors are
aligned and mounted correctly. The sensor should point almost perpendicular to the
ground and there should be no obstructions between the sensor and the ground.