Great Plains V-300F Operator Manual - Manual (Page 39)

Great Plains Manufacturing, Inc. Operations 35
11/15/2007 148-057M-A
Lift/Lower Operations
Lowering the Drill
The gauge wheel lift cylinders are on the same circuit as
the pressure compensating system (although the lift cyl-
inders do not rely on the compensated pressure). Be
aware of the sequencing during Lower.
1. Supply oil to the rod end of the lift cylinders (normally
set circuit lever to Retract).
2. Gauge wheels lower drill onto cylinder stops of
gauge wheel cylinders.
3. Opener sub-frame lowers opener to the ground and
pressure compensating valve pressurizes openers to
selected setting.
4. For planting, the circuit is left active in the Retract
mode (see “Hydraulic Down Pressure” on
page 36).
For adjustments, set the circuit lever to Neutral.
Raising the Drill
The gauge wheel lift cylinders are on the same circuit as
the pressure compensating system (although the lift cyl-
inders do not rely on the compensated pressure). Be
aware of the sequencing during Raise.
1. Supply oil to the base end of the lift cylinders (nor-
mally set circuit lever to Extend).
2. Opener sub-frame lifts openers.
3. Gauge wheels lift drill.
4. Set circuit lever to Neutral to hold drill raised, for
turns, and for installation of transport locks for move-
ment or adjustment.
Lift Cylinders During Operations
The transport-lift cylinders are rephasing hydraulic cyl-
inders. After a period of normal use, the cylinders may
get out of sequence. If this happens, the hitch lifts
unevenly or the coulters and openers on one side do
not run at the proper depth.
To rephase cylinders, raise drill completely and hold
hydraulic lever on for a few seconds to allow cylinders
time to rephase.