Great Plains YP825A Operator Manual - Manual (Page 26)

22 YP425A, YP625A and YP825A Table of Contents Index Great Plains Manufacturing, Inc.
401-651M Table of Contents Index 2014-08-15
Raising/Lowering Planter
Refer to Figure 16
Planter raising and lowering relies on two or 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 23) 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. Raise the planter completely, and hold the hydraulic
lever or switch for several seconds after the planter
reaches full raised position, or until all cylinders are
fully extended.
2. When all cylinders are fully extended, momentarily
reverse (Retract) the control to lower the planter
1 ⁄
2
inch (12 mm).
Lift Cylinder Locks (SN+)
Applies to planters with serial numbers:
(YP425A s/n B1009N+)
(YP625A s/n B1044Q+) (YP825A s/n B1015S+)
Use transport locks to hold the planter at raised for
transport, adjustments, maintenance and storage.
Refer to Figure 18
Transport locks are present on all wheel modules.
To install cylinder stops:
1. Raise planter to transport position (page 22).
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 45) before raising or lowering.
Disengage transport locks (page 23) 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 16
Planter Lift System
25463
1
1
Figure 17
Lift Cylinder Lock
31859
3
3