Great Plains V-300F Operator Manual User Manual
Page 41
Great Plains Manufacturing, Inc.
Operations
37
11/15/2007
148-057M-A
With the tractor hydraulic lever locked forward,
release the lock disk
, turn the knob
on the pres-
sure control valve
3.
Watch the pressure gauge
and dial in the desired
pressure on the openers. Clockwise increases the
pressure and counterclockwise decreases pressure.
4.
Once the pressure is set, lock the knob with the lock
disk.
The recommended pressure range for drilling is between
200 psi and 1400 psi. Setting the opener down pressure
above 1600 psi raises the drive wheels off the ground
when the seed box is empty, causing skips and poor
seed metering. See the following table for the relation-
ship between psi and down force.
The following down-forces are per-opener, with no extra
weight on the hangers (at the lower down-force values).
Higher down-force values may require weights on the
hangers
Adjustment Valve Effect
System PSI
Down Force per Row
kg
lbs
200
62
137
300
77
170
400
84
185
500
96
212
600
110
243
700
123
272
800
139
306
900
*
*
Settings at and above 900 psi may require extra
weights.
155
341
173
380
194
427
217
479
249
548
268
591
Figure 38
Down-Pressure Adjustment
27231
4
1
2
3