Great Plains 2335SC Operator Manual - Manual (Page 21)

Great Plains Manufacturing, Inc. Operating Instructions 17
10/08/2013 540-072M
Hydraulic Down Pressure (S/N 1031HH+)
Refer to Figure 8
Note: Note: This setup procedure is for tractors with
closed-center or pressure compensated flow
hydraulic systems. Open center hydraulics not
supported.
4. Adjust the bypass/pressure reducing valve by turning
knob
, Figure1, clockwise all the way in and then
backing out 1 full turn.
5. On tractor, adjust flow-control valve to low side of
flow rate.
Note: The faster the flow of oil through the system the
greater potential for oil heating, premature wear or
tractor damage.
6. Lock the fold hydraulic lever for continuous down-
ward oil flow.
7. Adjust bypass/pressure reducing valve knob on
implement so the pressure gauge reads 1200 psi.
Never exceed 1400 psi.
8. While watching pressure gauge, slowly open valve
knob
until gauge reads 1100 psi. Pressure might
rise and then fall off as knob is opened. If pressure
exceeds 1400 psi during this step, the tractor flow is
too high, reduce tractor flow. Lock valve knob
at
1100 psi.
9. Finally adjust valve to the desired wing down pres-
sure setting of 300 to 400 psi. Never exceed 700 psi.
10. In field operation, Lock the fold hydraulic lever for
continuous downward oil flow. If wings are running
too high, increase pressure setting, knob
, to level
machine. If center is too high, decrease pressure
setting with knob
on valve.Never leave tractor
valve centered when unfolded with machine in
motion. Machine damage may occur when wings flex
up or down.
Never leave tractor valve centered when unfolded with
machine in motion. Machine damage may occur when wings
flex up or down
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2
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Figure 8
Hydraulic Down Pressure (S/N 1031HH+) 42294
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