Great Plains 4000TM Operator Manual - Manual (Page 26)

22 3500-4000TM Great Plains Manufacturing, Inc.
586-537M 12/03/2013
Hydraulic Down Pressure 4000
Refer to Figure 24
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 25
41. Close rear valve (clockwise); open1 turn.
42. Set tractor flow rate for fold system to SLOW.
43. Engage hydraulics (continuous flow) down.
44. Adjust front valves and to obtain 1200 psi each.
45. Adjust rear valve to 1100 psi; lock valve.
46. Adjust front valves to desired down pressure 300-800
psi inside wings-left valve and 200-500 psi outer
wings-right valve .
47. If wings run too high, increase pressure. If center runs
high, decrease pressure,
48. Do not exceed 1000 psi.
Notice: When operating machine with the blades in angled
position it is generally unnecessary to apply wing down
pressure. Only in very hard ground will wing down pres-
sure 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
system. see your tractor operator’s manual to set system
to “FLOAT” position if necessary.
Caution: This machine is designed for continuous hydrau-
lic flow to the wing fold cylinders during field operations. It
is for use on tractors having CLOSED CENTER hydraulics
only.
Figure 24
Down Pressure 4000
42944
3
1
2
4
4
1
2 3
1
2
3
Figure 25
Down Pressure Decal 4000
858-002C