Great Plains 1625AHL Operator Manual - Manual (Page 33)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 29
2014-04-21 Table of Contents Index 411-020M
Raising/Lowering Planter
The planter mainframe raises and lowers independently
of the tongue.
• The planter may be fully raised at any time (and must
be raised for folding).
• The planter may be lowered onto its transport lock
channels at any time.
• The planter may be fully lowered, with lock channels
removed, only when unfolded.
Refer to Figure 18
Leave or set the Hydraulic Selector Marker/Fold switch to
center/OFF
or “MARKER” position to prevent
unintended folding.
Raising Planter
The planter may be raised at any time.
1. Move the Lift circuit lever to extend the lift cylinders.
2. Install lock channels if raising for transport, parking,
storage, adjustments or maintenance.
Note: After every few hours of operation (or earlier, if
uneven lift is observed), re-phase the lift circuit.
At a lift operation, hold the circuit in Extend for
30 seconds.
Lowering Planter
If lock channels are installed, the planter may be lowered
at any time. if lock channels are not installed, lower only
when unfolded.
Install lock channels (page 24) as appropriate for next
activity.
1. Move the Lift circuit lever to retract the lift cylinders
until settled on lock channels or fully lowered to
ground.
2. Set the lift circuit to Neutral for field operation.
Note: Unless lock channels are installed, fully lower the
planter only when fully unfolded. Lowering when
folded is prevented by the transport locks.
Re-phasing Lift System
Over a period of normal use the cylinders may get out of
phase. This will cause some planter sections to run
higher than others. If this is the case, it will be necessary
to re-phase lift cylinders.
Note: Lift cylinders can only be re-phased when planter
is unfolded.
To re-phase cylinders:
1. Raise the implement completely and hold the
hydraulic remote lever on for several seconds until all
cylinders are fully extended. Do this every
8 to 10 times you raise planter out of ground.
2. When all cylinders are fully extended, momentarily
reverse hydraulic remote lever to retract system
13 mm (
1 ⁄
2
inch) to maintain levelness.
Lowering Planter Hazard:
Use transport locks. A raised planter slowly lowers when held
up solely by circuit Neutral. Anyone beneath the row units
could be trapped and injured. Rely on circuit neutral to hold
the planter raised only for brief periods, such as field turns
and during lock channel installation. Use lock channels at all
other times.
Crushing Hazard:
Keep all persons away from frame sections during lift and
lower. Area under row units is particularly dangerous. Sharp
coulter and opener blades descend with hundreds of pounds of
down-force.
Figure 18
Hydraulic Selector Switches
34522
36230
M
O
O M