13 Operators Manual
minimise vibration damage to bulbs. Ensure if
away from the machine that it is available for
subsequent fitting as needed.
Tilt the machine slightly rearward to clear the
rigid support stand on 8m machines.
Unfold fully the wings, then tilt fully rearward
to lower the machine to ground level.
NOTE:
whilst lowering the
machine by tilting rearwards,
drive slowly forwards to
minimise damage to the rake tines
as they
contact the ground.
4.3 Field setting
If the pre-set pitch is in use (see next section
for details), provided the machine is unfolded
and fully tilted rearwards, at this position
change the tap settings to the work setting as
below.
Turn any taps off which will remain
so before turning the others on!!
4.3.1 Adjustment of frame pitch
Depth control of the rake tines is controlled by
the frame pitch, using the rear rollers to
maintain the desired tine setting. Additional
adjustment of the tine angle (see section
4.4.1) allows for effectiveness of straw carry,
and of tilth making when rolling seedbeds.
Any major adjustment of the machine pitch by
the main tilt cylinders may require the tine
frames to be adjusted by their toplinks to
maintain an even depth of tine tips fore to aft.
See section 4.4.1 for further details.
Setting of this pitch is by the main tilt
cylinders. These can be manually controlled
on the move by the tractor hydraulics, or the
desired pitch can be set via the adjustment
circuit. This returns to a pre-set position when
tilting downwards from the fully rearward
position for turning. This can be achieved by
operating the circuit in float (preferred) or
lower after a turn is made.
The tilt control can be initially set (this also
resets the circuit), adjusted to fine tune and
lock this setting, and memorise this setting
when folding so this position is available after
unfolding to start in another field.
The design of this system uses a closed
hydraulic cylinder with an internal piston. This
allows for the tilt position to be set (piston at
one end of the cylinder) and tilted rearwards
for turning (piston between this end and the
opposite end). When returning into work, the
locked oil then drives the piston back to its
original position in the cylinder to maintain the
desired pitch. Oil is introduced or taken from
the part of the circuit between this cylinder
and the tilt cylinders to alter the pre-set pitch
as needed. The cylinder is isolated when
folding and provided the sequence of
isolation is followed, the originally set tilt
position is maintained when unfolding in the
next field.
The tilt circuit can also be operated with the
tilt control disabled, allowing for simple tilting
rearwards and forwards without a pre-set
position. See the next section for this detail.
NOTE:
it is normal not to raise
and lower when turning so straw
can be collected from the
