Great Plains MF45 Operator Manual - Manual (Page 21)

4/15/2003 500-048M
19 Adjustments
Adjustments
Boom Height
After calibrating your sprayer for the specific nozzle you
will use at a desired pressure, and tractor speed, the main
field adjustment is the boom height. Refer to Elevator Op-
tion in the Sprayer Owner’s Manual. Depending on which
type of nozzle you are using, you need to set your boom
height so that you achieve the correct overlap for that spe-
cific nozzle. If the crop canopy is taller in some fields than
others, you will need to adjust the boom height according-
ly. Refer to the nozzle charts located in the Sprayer Own-
er’s Manual or 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 (refer to the Sprayer
Owner’s Manual or the Application Guide), 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.
After setting your boom height on the booms mounted on
the Tandem Axle Sprayers, there may be a need to adjust
the fold latch when the boom is ready to be folded. Refer to
Figure 11, page 17. If a hose fitting or nozzle is positioned
where the fold latch is located, the fold latch needs to be
offset with the fold latch extension provided. The fold latch
extension can be mounted in the forward or rear direction;
in any direction the fold latch needs to be repositioned. Af-
ter repositioning the fold latch, be sure to torque bolts to
the specifications listed in the Torque Values Chart for
Common Bolt Sizes in Appendix. If boom height is in the
lower ranges, you may want to raise the boom for trans-
port. Refer to Elevator in the Sprayer Owner’s Manual.
Nozzle Pressure
Another area that will need some field adjustments is the
nozzle pressure. As your tank level decreases, you may
have to adjust the boom pressure to keep the pressure at
the same magnitude for what the sprayer was calibrated
for. Watch your pressure gauge and be aware of changes
in the pressure.
Break-Away Pivot
The boom break-away pivot spring should be adjusted so
that the compressed length is 5 3/8 of an inch. If the spring
is not compressed to 5 3/8", the boom will tend to break
away over bumps and wear out the break-away mecha-
nism. Refer to step 7 under Sprayer/Boom Assembly In-
structions on page 10, along with Figure 1 on page 11.