Great Plains CF60 Operator Manual - Manual (Page 20)

CF50 and CF60
500-015M 4/16/2003
18
Adjustments
Boom Height
After calibrating sprayer for the specific nozzle to be used
at a desired pressure, and tractor speed, the main field ad-
justment is boom height. Refer to Elevator Option in the
sprayer owner’s manual. Depending on which type of noz-
zle used, set boom height to achieve correct overlap for
that specific nozzle. If the crop canopy is taller in some
fields than others, adjust boom height accordingly. Refer
to nozzle tables in the Application Guide to determine
the height of the boom needed.
EXAMPLE: A 2.5 Metercone nozzle at 20 inch spacing is
being used. From the nozzle chart, a height of 19 to 21
inches above the top of the crop is required. If the crop is
6 inches off the ground, the boom height should be set to
25 to 27 inches off the ground.
Nozzle Pressure
Another area that will need some field adjustments is noz-
zle pressure. As tank level decreases, adjust the boom
pressure to keep the pressure at the same magnitude for
what the sprayer was calibrated for. Watch the pressure
gauge and be aware of changes in pressure.
Leveling the Boom
For even application, the sprayer boom must be level
across the span. The boom is initially leveled during as-
sembly. You may need to make additional adjustments to
level the boom. To level the boom, refer to Leveling the
Boom, Preparation and Setup, page 14.
Boom Fold
If boom is not folding squarely into the fold rest as it should
due to damage on boom or some other reason, the boom
fold will need to be adjusted. Fold boom wing to a position
just above the stop rest. Slightly loosen the four adjust-
ment plate nuts until boom wing can move. Position boom
wing to stop square in the rest stop and retighten adjust-
ment plate nuts to 150 foot pounds. Make sure the
adjustment plate is adjusted so there are no gaps between
the ball joints of hinge and hinge tubing on boom wing. Un-
fold boom wing and re-torque adjustment plate nuts again.
Break-Away Spring
The break-away spring is located near the hinge for the
outside boom arm. On early models the break-away
spring should be compressed to a length of 5 3/8 inches.
On later models tighten the nuts that compress the spring
until all threads are bottomed out.
Fold Bracket
The fold brackets hold outside boom arm up when boom is
in the folded position. These brackets are initially posi-
tioned at the factory at an optimum position so when boom
is unfolded, the fold brackets will not interfere with spray
pattern. The brackets need to be positioned so both por-
tions of the bracket are located the same distance from the
adjacent nozzle. The bracket also needs to be positioned
so when boom is folded, the outer boom wing rests on the
fold rest, not on break-away nuts located near the hinge
point of outer boom wing. If the outer boom wing is resting
on the nuts, they will damage tubing on boom.
Spring Arm Tension
Refer to Figure 8
Tighten the spring nut until spring is compressed to a
length of 10 inches. Lock with second nut.
Figure 8
Spring Arm Adjustment
11937