48
8.4 B
OOM
I
NSTABILITY AND
M
AIN
L
IFT
8.4.1
•
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 if
necessary.
8.4.2
•
Boom unintentionally moves all the way up in CROP mode
Possible Cause(s)
Suggested Solution(s)
a)
Improper sensor
alignment
a)
Check sensor alignment (8.2.7). Ensure the
sensor is not reading off the boom.
8.4.3
•
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)
Check sensor alignment (8.2.7). Ensure the
sensor is not reading off the boom.
b)
System conflict
between devices (such
as other automatic
control devices)
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.
d)
Wear in a mast-style
lift system
d)
Apply shims or filler strips to the
mechanism, or adjust it, if applicable.
NOTE: Some sprayer designs use a mast-style lift
rather than parallel links. The sliding surfaces
on some of these machines are susceptible to
wear which leads to this symptom. The UC4+
Passive Roll control cannot take into account
error on the lift mechanism.
