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2.5 Drawbar - Pull Type Mower
For equipment operating at 540RPM, the tractor drawbar
must be positioned at a 14" distance from the hitch point to
the PTO shaft end for proper operation and minimal wear
to the driveline and tractor. Position the drawbar at 16" if
the mower is a 1000 RPM unit.
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- 0005str
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 6-spline shaft and those operating at 1000 RPM will have a 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 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.
Never operate the Tractor and Mower if the Implement input driveline is directly connected to
the Tractor transmission. Tractor braking distances can be substantially increased by the
momentum of the rotating Mower blades driving the Tractor transmission even though the
Tractor clutch has been disengaged. Install an over running clutch between the Tractor PTO
and the Mower driveline to prevent this potentially dangerous situation.
Do not connect the PTO driveline to the tractor or operate the implement unless the
implement is securely connected to the tractor.
TR308 04/21
@ 2021 Alamo Group Inc.
OPERATION
Operation Section 4-6
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