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Bondioli and Pavesi SH Series Splined Constant Velocity PTO -Ideal for Krone Balers
12-30-2015 ***
The following is a proposed part number and diagram for the shaft we believe will solve the current problems encountered in the field on the largest model Krone balers. We are not engineers. Bondioli and Pavesi has not approved of this and the part number is not a true Bondioli and Pavesi number.
However, many late model Krone balers have experienced premature constant velocity failure and although the CV is definitely failing, we believe the problem lies in the telescoping torque tubes, not the CV itself.
From the factory, Krone baler PTOs are designed for European tractors, which apparently are somewhat standardized from PTO output to hitch point. This is our assumption - that they are all nearly the same dimensionally - not a proven fact. Here in the USA, our tractors differ in length from PTO output to hitch point, so often times the factory PTO must be shortened to operate without "bottoming out" during a turn. The other noticable consideration is that the Europeans rarely cut the same volume of hay as we do per machine.
PROBLEM: Given the overall size of a Category 7 CV PTO, the tubes are too short in the first place. We measure them at less than 25" on a tube that is 2.75" in diameter. Under ideal conditions the engagement between the two tubes would be approximately 15". If they must be shortened, the engagement would obviously be less. Because of the extreme torque requirements of this application, 15" of tube engagement is not enough.
In our opinion, the telescoping tubes are wearing out on the Krone baler causing the PTO to whip, or jump, which creates additional, irregular thrust on both ends of the PTO. The CV fails soon thereafter, and because the CV is obviously worn out, the PTO is replaced with another tubular style PTO and the cycle is repeated.
more info ... splines vs tubes
SOLUTION: Retrofit using a splined constant velocity PTO.
Our prototype shown below can be shortened by cutting the splined shaft only. We've designed the outer shaft to be 7" shorter than the inner spline. Cutting the splined section up to 7" will not degrade the engagement from sleeve to spline. As is, the assembly will operate from 48" to 54" from locking groove on the tractor side to locking groove on the baler input. Maximum of 7" cut yields 41" to 47" inches. So the effective potential range of this proposed PTO is 41" to 54" operating.
We currently have 2) prototypes in stock and have requested this assembly be "drawn up" by Bondioli and Pavesi. If Bondoli obliges us, the lead time will be 3-4 months. If you have had problems with your Krone Baler PTO, we strongly urge you to take action soon. Hay season is on the way.
Part # CSHRS080USWR0016 |
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SH series CV Assembly 48 " from locking grooves in closed position |
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prototype |
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