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OPERATION
2215/12215 07/20
Operation Section 4-16
© 2020 Alamo Group Inc.
OPERA
TION
8.2 Constant Velocity (CV) Driveline
CV Driveline Maximum Angle Check Procedure
For mowers equipped with a Constant Velocity (CV) driveline, the maximum turning angle between the tractor
and mower must be determined to ensure the joint angle does not over-extend which can cause CV joint
damage. Constant Velocity joints enable the driveline to operate smoothly with no vibrations and clattering at
angles up to 80°. Angles greater than 80° can result in mechanical damage to the CV joint and mower
driveline.
The Constant Velocity joint must be lubricated every 8 hours of operation as specified in the Maintenance
Section. Failure to properly lubricate the joint will result in accelerated wear and joint component failure.
•
With the mower attached to the tractor and the driveline disconnected from the tractor PTO stub make a
hard left turn until there is approximately a 1” clearance between the left rear tractor tire and mower frame
or tongue.
•
Stop and completely shut down the tractor. Place the tractor in Park and apply the Parking Brake before
dismounting.
•
Check the CV joint at this maximum turning radius by holding the driveline yoke above the PTO shaft and
then angle the CV joint to its maximum angle. A minimum difference of 10 degrees between the centerline
of the yoke and the PTO shaft must be maintained to ensure the joint will not be over angled. If the joint
cannot be angled at least 10°, there is a potential problem of over-angling the joint while making sharp
turns.
•
Solutions: To ensure the joint is not damaged, check the following:
Check the drawbar length to ensure that it is at the proper length for the RPM speed of the mower.
Move the tractor rear tires wider apart to limit the tractor turning radius.
Position the mower at multiple angles and perform the above procedure. Determine the sharpest turning
radius that maintains a safe operating angle and note this position to the operator. OPS-R-0006_B
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