Great-plains 3000TM Operator Manual User Manual download pdf (Page 25)

Great Plains Manufacturing, Inc. Table of Contents Index Preparation and Setup 21

10/29/2013 Table of Contents Index 586-536M

Hydraulic Down Pressure

Refer to Figure 21

Note: This setup procedure is for tractors with closed-center or

pressure compensated ﬂow hydraulic systems. Open

center hydraulics not supported. Adjust down pressure

valve as shown on decal (located on front of left truss)

Refer to Figure 22.

36. Engage the hydraulics (continuous ﬂow) down.

37. From the cab, adjust the ﬂow so the needle on the bypass

gauge is in the green zone 1000-1500PSI.

38. At the valve, adjust the valve to set your initial down

pressure (usually 300-400). Do not exceed 800 PSI.

39. If the wings run high during operation, increase pressure.

If the center runs high, decrease pressure. If no pressure

is needed, move valve in tractor to “FLOAT” position.

Notice: When operating machine with the blades in angled

position it is generally unnecessary to apply wing down pres-

sure. Only in very hard ground will wing down pressure be

necessary.

Caution: When not operating with live down pressure the fold

system must be in “FLOAT” position. Failure to operate in

either ﬂoat or active down pressure will damage the fold sys-

tem. see your tractor operator’s manual to set system to

“FLOAT” position if necessary.

Caution: This machine is designed for continuous hydraulic

ﬂow to the wing fold cylinders during ﬁeld operations. It is for

use on tractors having CLOSED CENTER hydraulics only.

Figure 21

Down Pressure

43104

Figure 22

Down Pressure Decal

848-972C

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 43 44

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Great-plains 3000TM Operator Manual User Manual Page 25