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OPERATION
Operation Section 4-8
OPERATION
© 2004 Alamo Group Inc.
SR10M/SR15M 10-01
Never operate the Tractor and Mower if the Mower main 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 engaged. Install an over running clutch between the Tractor PTO
and the Mower driveline to prevent this potentially dangerous situation.
WARNING!
2.7 Power Take Off (PTO)
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.
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.
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.
WARNING!
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 Mower resulting in excessive
vibration, thrown objects, and blade and mower 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.
(S3PT-14)
2.5 Tractor Hydraulics
The mower center section and each wing are positioned with hydraulic cylinders that are operated by the tractor
hydraulic pump. The tractor must have a minimum of 2 hydraulic control valves devoted to the mower unless
the tractor is fitted with a 3-spool control valve (extra equipment).
A 3-spool control valve is required if the tractor is equipped with a single valve and is recommended for those
with two valves so that the center section and each wing can be controlled independent of one another. Refer
to the Assembly Section of this manual for properly equipping the tractor with a 3-spool control valve. Tractors
equipped with three hydraulic ports can position the center section and each wing independently with no extra
equipment. If the tractor is equipped with only two hydraulic ports and a 3-spool control valve is not used, the
wings cannot be operated independently and will raise and lower at different speeds.