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OPERATION
SE10-4A/SE15-4A 03/09 Operation Section 4-7
© 2009 Alamo Group Inc.
OPERATION
3.5 Drawbar
The tractor drawbar must be positioned at a certain
length based on the operating speed of the mower
for proper driveline operation. If the mower 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” or 20” for
1000 RPM using 1-3/4 - 20 shaft..
Ensure that the drawbar is rated to carry the
tongue weight of the mower.
Pintle Hook Hitch-Optional Equipment
Drawbar length must be modified to obtain
dimension "A" (CV Driveline = 17" ± 2"). OPS-R-
0061_F
3.6 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