Home' Grower : Dec 2010-Jan 2011 Contents The South Australian Grower -- December 2010/January 2011
height control, and there are trailing designs
for direct or offset working, all of which can
be bought with single or multiple cutting
The use of wheels on three point linkage
slashers is to a degree a matter of preference
and machine design and, perhaps, the age of
the tractor to be used.
With modern tractors equipped with
hydraulic auto-height control, wheels may
not be necessary.
On larger trailing and offset multiple disc
machines, wheels are generally standard
Slashers are generally categorised as high
speed machines with blade tips that travel at
speeds greater than 300 kilometres/hour.
It is this feature of slashers that allows the
grass to be cut by impact before it has time
to bend out of the way -- this is known as
Blade speed, however, should not be con-
fused with shaft speed which is expressed as
RPM. It is the shaft speed that controls the
blade speed -- the faster the rotation of the
shaft, the faster the blade speed will be.
All slashers on the market drive through a
gearbox connected to the tractor PTO shaft,
and these spinning shafts must be properly
machines is generally controlled via the trac-
tor hydraulic remote system in combination
with the machine wheels.
Shielding is another important factor to
consider when buying a new slasher.
The consideration here is what the slashed
material is wanted for after it is cut.
Fully shielded slashers may tend to restrict
the cut material (grass or crop) movement
through the slasher undercarriage causing it
to be 'hit' by the blades several times before
it can exit the machine.
Depending on the extent of the shielding,
it may lead to the almost total pulverisation
of the material, or it may simply bruise and
lacerate it for faster curing.
It is worth remembering that fully shield-
ed slashers, more often than not, have to be
worked at slower travelling speeds, while
lesser shielded machines will simply cut the
material and leave it lying where it falls.
To some extent, the amount of shielding
and guarding on slashers today is dictated by
various industrial codes and requirements of
Occupational Health and Safety regulations.
It is worth remembering that where shields
and/or guards are fitted by a manufacturer,
it may be an offence (with hefty penalties) to
remove and operate a machine without
A Ben Wye Piranha Twin row drop centre slasher working in an Adelaide hills orchard.
Ben Wye Piranha standard three point
linkage slasher with a following wheel.
GETS YOU INTO AND OUT OF TIGHT PLACES
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