Spearhead
Multi-Cut
420
7
Introduction
The Spearhead
420
is a heavy-duty rotary mower for a set-aside, stubble and
pasture topping. By carefully following the instructions in this handbook, the
420
will
give many years of trouble free operation.
Safety First
Never start using the machine until the handbook has been read and understood.
The
420
rotary mower is a potentially lethal machine if used incorrectly and it is
essential that the operator fully understand the working before starting up
.
Tractor Requirements
Spearhead recommend tractors of between 85 and 120hp.
Category 2 three-point linkage.
Stabilisers or check chains must be in good working order to hold the
machine firmly. Do not operate without ensuring the check chains or
stabilisers are tight. Spearhead particularly recommend “turnbuckle” type
check chains.
Set tractor lift rods of equal length.
Before hitching, ensure position control is selected. Do not attempt to hitch in
draft control.
Ensure there is sufficient weight on front wheels of the tractor for safe
transport and stability. The tractor should have a minimum weight of 3700 kg.
The tractor should have a 1000rpm P.T.O.
One external hydraulic service required, single acting with float facility for
wings.
Attaching To The Tractor
Fit the machine to the tractor in the standard way, ensuring the correct match of
linkage (
category 2
). Check that the top link is in good order and the threads are well
lubricated. Use stabilisers to eliminate any sideways sway.
Before lifting the machine with the tractor linkage you should ensure there is
sufficient front weight to keep the front wheels in contact with ground. This is most
important for safe transport and stability when turning on sloping ground.
It is essential to ensure that the tractor drawbar cannot foul the P.T.O. shaft, we
advise to remove it altogether if there is any doubt.
Before fitting the PTO for the first time, it may be necessary to adjust the length.
There should be maximum engagement of the sliding tubes without bottoming at the
shortest operation position. To check, first connect the mower to the tractor. Pull the
PTO shaft apart and connect to the tractor PTO output shaft and the gearbox input
shaft. Hold the half shafts next to each other in the shortest working position. If
necessary, shorten the inner and outer guard tubes equally (Fig. 1). Shorten the
inner and outer sliding profiles by the same length as the guard tubes. File all sharp
edges and remove burrs. Grease sliding profiles.
