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<blockquote data-quote="Atimm693" data-source="post: 1689200" data-attributes="member: 26138"><p>The shaft that the spins the turtle is also threaded, so if the pin shears the turtle will unscrew up out of the way and not hit the others. The biggest worry I have with these is if you go many years without shearing one, I think everything could rust together and you might as well not have it.</p><p></p><p>New Holland has their shock pro setup on many models, which is pretty good from what I've read, but can "domino" with a hard impact, meaning that you will break the initial hub, and possibly adjacent ones from the turtles hitting together when they lose time.</p><p></p><p>There are advantages and disadvantages to different cutterbar designs. With a single gearbox assembly, changing the oil is easy, and there is less wear because everything is well lubricated. However a loss of oil or internal failure of one part can destroy the whole thing, and you need to be careful running on slopes.</p><p></p><p>Modular bars are nice because any failure will be confined to one module, however there are several stub shafts that will wear out between them, and changing the oil/grease in all of them is a pain.</p><p></p><p>I don't believe that the shear protection is quite as important on 3pt mowers. They are light enough that they can just ride over a lot of stuff. Mower conditioner headers are a lot heavier and tend to get things jammed into the cutter bar more, plus you have the rollers that can kick things up or toss it back and forth.</p><p></p><p>We have a Vermeer MC840 and a New Holland DB313R that is a new arrival. I've never really liked the Vermeer, but the NH has been working well so far.</p><p></p><p>Vermeer and Lely are involved together somehow, a lot of Vermeer mowers have Lely cutterbars.</p><p></p><p>JL, were you looking at just a 3pt mower, or a trailed mower/conditioner?</p></blockquote><p></p>
[QUOTE="Atimm693, post: 1689200, member: 26138"] The shaft that the spins the turtle is also threaded, so if the pin shears the turtle will unscrew up out of the way and not hit the others. The biggest worry I have with these is if you go many years without shearing one, I think everything could rust together and you might as well not have it. New Holland has their shock pro setup on many models, which is pretty good from what I've read, but can "domino" with a hard impact, meaning that you will break the initial hub, and possibly adjacent ones from the turtles hitting together when they lose time. There are advantages and disadvantages to different cutterbar designs. With a single gearbox assembly, changing the oil is easy, and there is less wear because everything is well lubricated. However a loss of oil or internal failure of one part can destroy the whole thing, and you need to be careful running on slopes. Modular bars are nice because any failure will be confined to one module, however there are several stub shafts that will wear out between them, and changing the oil/grease in all of them is a pain. I don't believe that the shear protection is quite as important on 3pt mowers. They are light enough that they can just ride over a lot of stuff. Mower conditioner headers are a lot heavier and tend to get things jammed into the cutter bar more, plus you have the rollers that can kick things up or toss it back and forth. We have a Vermeer MC840 and a New Holland DB313R that is a new arrival. I've never really liked the Vermeer, but the NH has been working well so far. Vermeer and Lely are involved together somehow, a lot of Vermeer mowers have Lely cutterbars. JL, were you looking at just a 3pt mower, or a trailed mower/conditioner? [/QUOTE]
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