Great Plains 4000TM Operator Manual - Manual (Page 28)

24 1200-4000TM Table of Contents Index Great Plains Manufacturing, Inc.
586-288M Table of Contents Index 10/30/2012
Hydraulic Down Pressure 3500
Refer to Figure 22
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 23 .
40. Engage the hydraulics (continuous flow) down.
41. From the cab, adjust the flow so the needle on the bypass
gauge is in the green zone 1000-1500PSI.
42. At the valve, adjust the valve to set your initial down
pressure (usually 300-400). Do not exceed 800 PSI.
43. 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 22
Down Pressure 3500
42865
4
2 3
1
1
2
3
4
Figure 23
Down Pressure Decal 3500
848-972C