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2.3 Tractor Horsepower
The horsepower required to operate a cutter depends on several factors including the vegetation to be cut,
terrain condition, operator experience and condition of the cutter and tractor. For most applications the cutter
requires a tractor with at least 100 HP(75 kW). Operating the mower with a tractor that does not have adequate
power may damage the tractor engine.
2.4 Drawbar
Position the length of the drawbar from the end of
the tractor PTO shaft to the drawbar hitch hole
according to the operating speed of the cutter. If the
cutter is a 540 RPM unit, position the drawbar
length from shaft end to hitch hole at 14". For 1000
RPM cutters, set the drawbar length at 16" for 21
spline 1-3/8" cutters and at 20" for 1-3/4" 20 spline
cutters.
Incorrect drawbar length will change angle of
driveline causing possible damage to constant
velocity joint. Do not use PTO adaptors. PTO
adaptors will invalidate your warranty. See your
tractors operator's manual for drawbar adjustment
procedures.
BE SURE THAT THE TRACTOR PTO SPEED IS 1000 RPM MATCHES THE ROTARY
CUTTER GEARBOX SPEED.
2.5 Tractor Hydraulics
The tractor operating the cutter must have two double acting hydraulic circuits operating at 2000 PSI (13.8
MPa). One circuit for the operation of the phasing system and one for the wing lift system.
2.6 Front End Weight
A minimum of 20% total tractor weight must be maintained on the tractor front end at all times. Front end
weight is critical to maintain steering control and to prevent the tractor from rearing up while driving. If the
front end is too light, add weight until a minimum of 20% total weight is reached on the front tires. Front
weights and weight carriers can be purchased through an authorized tractor dealership. OPS-U- 0005
FX-520 06/16
© 2016 Alamo Group Inc.
OPERATION
Operation Section 4-5
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