OPERATION
XH1500/XH1000 06-24 Operation Section 4-5
OPERATION
© 2024 Alamo Group Inc.
2.4 Drawbar - Pull Type Mower
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 mower. If
the cutter is a 540 RPM unit, position the drawbar
length from shaft end to hitch hole at 14”. For
1000 RPM mowers, 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 adapters. PTO
adapters will invalidate your warranty. See your
tractor’s operator’s manual for drawbar
adjustment procedures.
2.5 Tractor Hydraulics
The cutter deck and wings are raised and lowered with hydraulic cylinders operated by the tractor hydraulic
pump. There are several ways to configure the mower hydraulics depending on the number of tractor selective
control valves and if they are single or double acting. The cutter can be operated on a tractor with a minimum
of one double acting circuit.
Refer to the assembly and parts section of this manual for hydraulic system set-up or contact an authorized
dealer for the best configuration depending on your tractor hydraulic capabilities and your intended cutter use.
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 str
2.7 Power Take Off (PTO)
Depending on the unit, the mower is designed to operate at a PTO speed of 540 or 1000 RPM. Most tractors
operate at either 540, or a combination of 540 and 1000 RPM PTO speeds. 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 540 RPM will have a 1-3/8” diameter 6-spline shaft and those operating at 1000 RPM will have a
1-3/8” 21-spline shaft or 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. An authorized
tractor dealer can provide the over-running clutch and its installation if needed. OPS-U- 0006_D str
DO NOT use a PTO adapter to attach a non-matching Implement driveline to a Tractor PTO.
Use of an adapter can double the operating speed of the Implement resulting in excessive
vibration, thrown objects, and blade and implement failure. Adapter use will also change the
working length of the driveline exposing unshielded driveline areas. Serious bodily injury and/
or equipment failure can result from using a PTO adapter. Consult an authorized dealer for
assistance if the Implement driveline does not match the Tractor PTO.
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