Great Plains YP1220 Operator Manual - Manual (Page 21)

Great Plains Manufacturing, Inc. Preparation and Setup 17
03/14/2012 401-506M
Hydraulic Charge and Bleed
Normally the hydraulic system is fully charged and bled
at the factory before shipping. If repairs have been made,
substantial amount
s of oil drained from the system, or the following proce-
dures do not correct a problem, see “Bleeding Hydrau-
lics” on page 55.
Lift Hydraulics
Bleeding should not be required other than to raise fully
and hold lever on for one minute or until all cylinders
extend fully. If this does
Cylinder Hydraulics
Bleeding should not be required other than to fold fully
and hold lever on for one minute or until all cylinders
reach the end of their stroke.
Planter Damage Risk:
Do not fold or unfold without first raising planter completely.
Leveling Frame Side-to-Side
All frame sections must be level to maintain even plant-
ing depth. Before using the planter in the field, follow
these steps to make sure the planter is level side-to-side.
Periodic frame-leveling adjustments should not be nec-
essary, but if you are having problems with uneven
depth, check planter levelness and follow these proce-
dures.
Before making any adjustments be sure the lift cylinders
are re-phased and operating properly.
Complete the steps under “Hydraulic Charge and
Bleed” on page 17, before proceeding.
Note: Level frame in planting conditions. Failure to do so
may result in machinery not producing desired re-
sults.
Refer to Figure 9
1.
Unfold the planter fully and set down. Put in field
position by lowering and pulling forward. Figure 9
Base Height
27457
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