Great Plains YP4025A Operator Manual - Manual (Page 33)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 29
2013-04-24 Table of Contents Index 401-627M
Lift Cylinder Lock-Up
When moving the raised planter more than a short
distance, or over any public road, or when performing
adjustments or maintenance, do not rely solely on the lift
cylinders to keep the mainframe raised.
Install transport locks.
Refer to Figure 26
1.
If planter is folded, confirm hitch is in Float.
If planter is unfolded, hitch may be in any
configuration.
2. Raise the planter mainframe. See
“Raising/Lowering Planter” on page 27.
3. Remove the transport locks from their storage
positions
. Install the transport locks on the
cylinder rods , securing them with the same pins
used for storage.
4. Lower the lift cylinders onto the locks.
Re-Phasing Lift System
In typical use during a single planting operation, it is
normal for the lift cylinders to get slightly out of phase,
resulting in uneven raising and lowering of the YP4025A
Planter.
Every 8- to 10 passes, or if lifting is uneven, re-phase the
cylinders with this procedure:
1. Raise the planter completely, and hold the hydraulic
lever or switch in Extend for several seconds after
the planter reaches full elevation, 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 (13mm).
Local Float on Hydraulic Tongue
A hydraulic hitch planter may be raised or lowered while
folded using the local float valve.
1. Float hitch circuit before lowering while folded.
Float hitch circuit before rasing while folded.
2. Set CFM Lift/Hitch switch to Lift for raising/lowering.
3. Close bypass valve before switching to Hitch. Hitch
circuit operation has no effect with bypass valve
open.
Figure 26
Lift Cylinder Locks Installed
29283
1
1
2
2
1
2
Crushing Hazard:
Tongue or
planter components may drop suddenly when cir-
cuit is floated. Before raising or lowering, set CFM Lift/Hitch
switch to Hitch and set tractor circuit to Float. If tractor is not
available, use bypass valve on hitch.
Stand clear and open it slowly.
Figure 27
Local Float on Hydraulic Tongue
28477
1