Great Plains P17921E Operator Manual - Manual (Page 28)

UniPress
Operating Instructions
28
When the UniPress is used tilted onto the
rings the loading on the disc cultivator or
tractor drawbar is increased. This will cause
the rear of the disc to dig deeper moving the
rear gang to the right. Shortening the disc
cultivator levelling springs should allow the
disc cultivator to pull straight again. Equally,
increased tractor drawbar loadings will
deepen wheelings requiring more effort to
eradicate these.
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.
Fully extending the drawbar
cylinder and then reversing into
the headland furrow could lead to
damage of the cylinder.
4.7 Using Shims
Before using shims to alter machine settings
ensure the machine is stationary and the
tractor is turned off with the keys out. Ensure
that all operators are clear of the machine
and that no load is being held on any existing
shims in the cylinder.
To fit the shims hold them by the handle and,
using a firm action, clip them onto the rod
as shown in Fig. 4.05. They are removed by
using a finger to pull firmly on the handle.
Check the cylinders for damage
and debris before fitting shims.
Only attempt to add or remove
shims using the handle. Trying to
manipulate shims using the jaws
could result in injury.
When changing machine settings
ensure both sides of the machine
mirror each other. The left hand
cylinder should contain the same
amount of shims as the right, for
example. Failure to do this could
result in damage to the machine.
Fig. 4.05: Shims
4. Adjustment / Operation