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Pto speed on mower
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<blockquote data-quote="Cowabunga" data-source="post: 6229606" data-attributes="member: 718"><p>At some point I think there were two things that perpetuated this nonsense. There were some issues with early 3000 series MF where the bearing specification on the PTO final drive was not up to par. It was one of the first to offer 750 PTO speed [not THE first though]. There was that.</p><p></p><p>Then there is the fact that supplying 540 at [say] 1500 engine rpm used to be way down the power curve on older type engines. Not so much on modern 'constant power' engines though. However, 1500 is usually on or very near the point where engines produce their maximum torque, from there down the torque drops off rather than rises [as engines lug down], so there is very little if any torque reserve at these revs to overcome increased load, whether steady or sudden. It does make a big difference when working on the limit at either engine speed. The engine running at 2000rpm+, dead on or above where it turns out maximum power, typically has a 35% torque reserve [rise] available to overcome increasing loads.</p></blockquote><p></p>
[QUOTE="Cowabunga, post: 6229606, member: 718"] At some point I think there were two things that perpetuated this nonsense. There were some issues with early 3000 series MF where the bearing specification on the PTO final drive was not up to par. It was one of the first to offer 750 PTO speed [not THE first though]. There was that. Then there is the fact that supplying 540 at [say] 1500 engine rpm used to be way down the power curve on older type engines. Not so much on modern 'constant power' engines though. However, 1500 is usually on or very near the point where engines produce their maximum torque, from there down the torque drops off rather than rises [as engines lug down], so there is very little if any torque reserve at these revs to overcome increased load, whether steady or sudden. It does make a big difference when working on the limit at either engine speed. The engine running at 2000rpm+, dead on or above where it turns out maximum power, typically has a 35% torque reserve [rise] available to overcome increasing loads. [/QUOTE]
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Pto speed on mower
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