Great-plains 2551SC Operator Manual User Manual download pdf (Page 21)

Great Plains Manufacturing, Inc. Operating Instructions 17

10/09/2013 540-179M

Hydraulic Down Pressure

Refer to Figure 8

Note: This setup procedure is for tractors with closed-

center or pressure compensated ﬂow hydraulic

systems. Do Not Use with open-center hydraulics.

Use optional wing weights.

5. Adjust the bypass/pressure reducing valve by turning

knob , clockwise all the way in and then backing

out 1 full turn.

6. 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.

7. Lock the fold hydraulic lever for continuous down-

ward oil ﬂow.

8. Adjust bypass/pressure reducing valve knob on

implement so the pressure gauge reads 1400 psi.

Never exceed 1600 psi.

9. While watching pressure gauge, slowly open valve

knob until gauge reads 1300 psi. Pressure might

rise and then fall off as knob is opened. If pressure

exceeds 1600 psi during this step, the tractor ﬂow is

too high, reduce tractor ﬂow. Lock valve knob at

1300 psi.

10. Finally adjust valve to the desired wing down pres-

sure setting of 800 to 1000 psi. Never exceed 1200

psi.

11. 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 hydraulic lever centered while in ﬁeld mode.

Machine damage may occur when wings ﬂex. Use continuous

down or ﬂoat.

Figure 8

Hydraulic Down Pressure

42294

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Great-plains 2551SC Operator Manual User Manual Page 21