McHale V Series Baler
74
7.4.3 Knife operation (V6750/ V8950 only)
Standard knife operation
The knives can be lowered or raised by holding the knife diverter (button 8) and
operating the pick-up spool lever in the tractor. The knives will be raised until the target
pressure is reached, at which point the solenoid switches off preventing any further
pressure increase. This works the same in MAN or AUTO mode.
The knife position is monitored by a sensor which displays an indicator on the main
screen if the knives are fully engaged in the chopping position.
The hydraulic pressure keeping the knives up can be monitored on the second main
working screen. Normal operating pressure, when knives are raised, is limited to 50 bar
to protect the knives against foreign objects.
Occasionally, if the knives have not been activated for a long time, maximum tractor
hydraulic pressure may be needed to raise them. To do this, raise the knives until the
pressure reaches normal operating level and stops increasing, then release the knife
button and press again while operating tractor hydraulics. The pressure display will be
seen to go to the tractor maximum (usually about 180 bar) and the knives will raise. A
warning will flash to indicate that knife pressure is too high for baling and the red light
beside the knife button will flash. Lower the knives, then raise them again to reset the
pressure to normal.
The machine must not be used when the knives are in the up position, under full
hydraulic pressure, as damage may occur if a foreign object is taken into the pick-up.
Selectable knives operation
Selectable knives are an optional extra where the chopper unit has two sets of knives,
which can be independently controlled. The operator can easily activate either set or
both sets of knives. On the machine this is selected by means of a 3-way tap mounted
on the machine.
Knives in up position
Knife
pressure
Knife pressure is too high warning
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