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3. Tractor Horsepower
The horsepower required to operate the mower depends on several operating factors including the vegetation
to be cut, terrain condition, operator experience, condition of the mower and tractor, and other factors. The
minimum tractor HP is 250 HP(186kW). Operating the mower with a tractor that does not have enough power
will produce a less desirable cut and may cause tractor engine damage.
3.1 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.
The drawbar must be able to support the weight of the rotary cutter.
3.2 Tractor Hydraulics
The cutter deck and wings are raised and lowered with hydraulic cylinders operated by the tractor hydraulic
pump. The tractor operating the cutter must have two double acting hydraulic circuits operating at 2500 PSI
(17.2 MPa). One circuit for the operation of the phasing system and one for the wing lift system.
3.3 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
3.4 Power Take Off (PTO)
This mower is designed to operate at a PTO speed of 1000 RPM 1-3/4 x 20. The operating speed of the
mower and tractor can be determined by the number of splines on the driveline yoke and PTO output shaft.
Those operating at 1000 RPM will have a 1-3/4" 20 spline shaft. Refer to the tractor owner's manual for
instructions to change PTO speeds on models that operate at more than one speed.
If operating an older model tractor where the tractor's transmission and PTO utilize one master clutch, an
over-running clutch must be used between the PTO output shaft and the driveline of the mower.
authorized tractor dealer can provide the over-running clutch and its installation if needed. OPS-U- 0006_C
FX-742 07/16
© 2016 Alamo Group Inc.
OPERATION
Operation Section 4-5
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