Great Plains P12720 - Manual (Page 35)

35 X-Press
Operating Instructions
5.6 Cushioning Pressure
Adjustment Procedure
Normal operating pressure for this system is
around 25-30 bar.
1. Open the front tap (Fig. 5.05, item 1)
2. Open the tap nearest to the gauge (Fig.
5.05, item 2)
3. With the wings unfolded, lower the
machine to the ground so that the front
discs force oil out of the cushion end of
the cylinder.
4. Raise the machine so discs are clear
of the ground. There should be no
pressure showing on the gauge (Fig.
5.05, item 3) .
5. By feathering the lever in the tractor cab
extend the cushion end of the cylinder
by retracting the opposite end whilst
checking the reading on the gauge.
6. When the desired pressure is achieved
lock the handle near the gauge (2). This
will isolate the cushioning circuit. The
disc pitch part of the ram can now be
used independantly of the cushion
circuit.
7. Once the desired amount of shims are
set in place retract the cylinder and lock
the circuit by closing the front tap (1).
The gauge will fluctuate in operation, this
is normal. If the disc frames “give up”
too easily then the cushion pressure will
need to be increased.
Fig. 5.05: Cushioning Hydraulic System
5. Servicing and Maintenance