Norac UC4 - 4.4 Boom Instability and Main Lift

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4.4 BOOM INSTABILITY AND MAIN LIFT
4.4.1
 Erratic or “jumpy” boom behavior (in CROP mode)
 Bouncing boom(s)
Possible Cause(s) Suggested Solution(s)
a) Sensor readings from
the crop canopy are
less uniform than
from soil
a) Tune the hydraulic system properly.
NOTE: This symptom occasionally appears on the
main lift control. If so desired, the main lift
control may be disabled (Passive Roll control
will still be functional).
b) Inappropriate
accumulator(s) on lift
hydraulics
b) Check the accumulator(s). Replace it
(them) to adequate one(s), if necessary.
4.4.2
 Boom unintentionally moves all the way up in CROP mode
Possible Cause(s) Suggested Solution(s)
Improper sensor alignment
Check sensor alignment (Section 6). Ensure the
sensor is not reading off part of the boom.
4.4.3
 Irregular boom movement or boom instability
 Control panel interferes with auto steer or rate controller operation
Possible Cause(s) Suggested Solution(s)
a) Improper sensor
alignment
a) Follow 4.2.3.
NOTE: Boom instability is often associated with poor
readings from the target rods.
b) System conflict
between certain
devices (such as other
automatic control
devices) and the UC4
system
b) May need plumbing changes or adjusting
pump pressure settings.
NOTE: This symptom may occur on sprayers that use
load-sensing hydraulic systems.
c) Wear in boom damper
shocks
c) Check the boom damper shocks. Replace
them, if necessary.
NOTE: Without adequate mechanical damping, the
system may become unstable.