Great Plains P17921E Operator Manual - Manual (Page 26)

UniPress
Operating Instructions
26
4.4 Double Disc Roller
The standard DD700 roller is made up of
individual Double Disc (patented) Ring
segments.
The DD rings are designed to consolidate
the soil whilst cutting and crushing any clods.
Even in heavy, wet soils it can easily be
operated with minimal blockages occurring.
The DD roller carries a proportion of the
machine’s weight to ensure consolidation.
The corrugated surface left by the roller is
weatherproof both for wet or dry situations.
Fig. 4.04: Double Disc Roller
4. Adjustment / Operation
4.5 Work Settings
In work the wing cylinders should be fully
extended. The gangs are able to float over
any undulations on the ground due to their
floating frames.
Optimum performance has been found
to be achieved when the press roll rings
have worn away the painted finish leaving
a smooth shiny surface. When the press
roll rings are new or rusty, soil may tend to
pick up on the surface and blockage may
occur, this will reduce when the rings are
shiny again.
The UniPress should be run with the chassis
level front to rear by extending the drawbar
cylinders to the necessary position. The
cylinders should not be over extended as
this will remove the load on the rings which
could lead to reduced drive and hence
blockage of the axles.
It is not necessary to tilt the UniPress onto
the transport wheels during headland turns
whether the machine is used independently
or in tandem with a disc cultivator. Normally,
the UniPress should be tilted sufficiently onto
the roll for the tines and levelling boards to
clear the ground (at which point the rear axle
wheels will still be clear of ground contact).
4.5.1 Levelling Boards
The levelling boards are set using shims in
the levelling board cylinders. During work,
these cylinders should be retracted onto the
shims but can be extended to release any
soil / trash build up.
With the chassis set level add shims until the
levelling boards are carrying soil. The level-
ling boards will need to be set higher during
1st pass operations especially on ploughed
land where large clods may not be able to
pass under or between the sprung leaves.