Great Plains V300 Assembly Instructions - Manual (Page 20)

Great Plains Mfg., Inc.
20 Opener Down Pressure Kit
148-771M 11/08/2006
Refer to Figure 28
3. After the opener pressure is set, opener depth
➀
is
controlled by the press wheel adjustment. Attached
to the rear of each opener is one of several optional
press wheels. The press wheels close the furrow
and gently press soil over the seed while also pro-
viding depth control for the opener. To adjust the
position of the press wheel, which automatically
changes the seeding depth of the opener, lift the “T”
handle located on top of the opener and slide it for-
ward
➁
or rearward
➂
until the seeding depth is
correct, as shown in Figure 2-10. Moving the handle
forward
➁
plants shallower while moving the handle
rearward
➂
plants deeper. A spring loaded pin
holds the “T” handle at the setting to maintain the
proper depth. Lift the opener frames slightly to take
the pressure off the “T” handles when adjusting the
press wheel depth.
Note: The opener pressure setting controls the soil firm-
ing pressure on the press wheel as well as the disk
penetrating force. DO NOT use more opener down
pressure than necessary to obtain the desired
opener penetration and to maintain the proper
firming action over the seed. Set the planting
depth with the depth controlling press wheel and
only use enough opener pressure to cut the proper
seed groove and maintain the desired soil firming
action. Excessive opener force will lead to exces-
sive wear and damage of the opener components.
Priority Flow Hydraulic Systems
On some tractors with load-sensing hydraulics, the circuit
#1 is capable of taking nearly 100 percent of available
hydraulic flow. Operating the openers or markers on cir-
cuit #1 will starve the other circuit, making one function
inoperable.
To operate markers and constant opener down pressure
at the same time, connect the openers to circuit #2 and
the markers to circuit #3.
Note: On some tractors with very positive remote
hydraulic checks, a slight increase in the reading
on the pressure gauges may occur after the tractor
remote lever is returned to neutral. This is caused
by back pressure on the opener cylinders and
should be ignored. The NET OPERATING PRES-
SURE on the opener cylinders is maintained at the
pressure you selected while the tractor remote
lever was held forward–not at the “apparently
increased” pressure. Reactivating the tractor lever
forward will confirm this.
Figure 28
Opener Adjustment
15659
➀
➁
➂