Great-plains 4000TT Operator Manual User Manual download pdf (Page 30)

26 1200-4000TT Great Plains Manufacturing, Inc.

586-201M 02/11/2014

4000 Hydraulic Down Pressure

Refer to Figure 21

Note: This setup procedure is for tractors with closed-cen-

ter or pressure compensated ﬂow hydraulic systems.

Open center hydraulics not supported.Adjust down

pressure valve as shown on decal (located on front

of left side of center frame) Refer to Figure 22

Never leave tractor valve centered when unfolded with machine

in motion. Machine damage may occur when wings ﬂex up or

down

This machine is designed for continuos hydraulic ﬂow to the

wing fold cylinders during ﬁeld operations. It is for use on trac-

tors having CLOSED CENTER hydraulics only. If your tractor

has an OPEN CENTER hydraulics, please consult your dealer

for operating instructions.

45. Adjust the bypass valve by turning knob clockwise

all the way in and then backing out 1 full turn.

46. 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.

47. Lock the fold hydraulic lever for continuous downward

oil ﬂow.

48. Adjust pressure reducing valves knob and on

implement so the pressure gauges reads 1200 psi

each. Never exceed 1400 psi.

49. While watching pressure gauges, slowly open bypass

valve, knob until gauges read around 1100 psi.

Pressure might rise and then fall off as knob is opened.

If pressure exceeds 1400 psi during this step, the trac-

tor ﬂow is too high, reduce tractor ﬂow. Lock bypass

valve knob at 1100 psi.

50. Finally adjust valve knob to 650-900 psi pressure

setting, never exceeding 1100 psi. Adjust valve knob

(3) to 650-750 psi. pressure setting, never exceeding

1000 psi.

51. In ﬁeld operation, Lock the fold hydraulic lever for con-

tinuous downward oil ﬂow. If wings are running too

high, increase pressure setting to the appropriate

valve, and , to level machine. If center is too high,

decrease pressure setting with knob on Inside wing

valve.

Figure 21

4000 Down Pressure

41069

848-266C

Figure 22

4000 Down Pressure Decal

848-266C

2 3

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