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OPERATION
CY84 03/08 Operation Section 4-7
© 2008 Alamo Group Inc.
OPERATION
3.5 Drawbar - Pull-Type Mower
For pull-type mowers (540 and 1000 RPM)
equipped with an equal-angle driveline, 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.
If attaching the mower tongue clevis to a 3-point
hitch drawbar supported by the lower lift arms, the
attaching point must be extended past the main bar
to allow for turning without binding the clevis and
bar. Lift arm stabilizers must be used with this type
of drawbar to prevent the mower from swaying from
side to side.
3.6 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
3.7 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