Great Plains YP625PD Operator Manual - Manual (Page 23)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 19
02/23/2011 Table of Contents Index 401-754M
Raising/Lowering Planter
Refer to Figure 11
Planter raising and lowering relies on four lift cylinders
.
To raise or lower the planter, move the lever for the Lift
circuit.
Gradual Crushing Hazard:
Do not rely on hydraulic pressure alone to keep the planter
raised. Use transport/lift locks (page 19) when working
around a raised planter. The bypass orifices in the re-phasing
system cause it to slowly lower.
Re-Phasing Lift System
In typical use during a single planting operation, it is
normal for the lift cylinders to get out of phase, resulting
in uneven raising and lowering of the planter.
Every 8 to 10 passes, re-phase the cylinders with this
procedure:
1. Lower the planter completely, and hold the hydraulic
lever or switch in Retract for several seconds after
the planter reaches full lowering, or until all cylinders
are fully retracted.
2. When all cylinders are fully retracted, momentarily
reverse (Extend) the control to raise the planter
1 ⁄
2
in
(12mm).
Lift Cylinder Locks
Use transport locks to hold the planter at raised for
transport, adjustments, maintenance and storage.
Refer to Figure 12
Transport locks are present on all wheel modules.
To install cylinder stops:
1. Raise planter to transport position (page 19).
2. Pivot cylinder stops into engagement with lift
cylinder rods. The stop channels snap into position.
3. Lower planter onto stops.
Raise planter, and hold at raised, before releasing
transport locks.
Machine Damage Risks:
Always fold markers (page 32) before raising or lowering.
Disengage transport locks (page 19) before lowering.
Always raise the planter for any reverse/backing.
Except on pavement, begin forward motion before lowering, as
rows move backward slightly as arms swing up.
Figure 11
Planter Lift System
25463
1
1
Figure 12
Lift Cylinder Lock
31859
1
1