The drawbar length standard is really only important for implements that have a fixed shaft down the tongue with a short telescoping shaft with u-joints on either end centered above the hitch pin. With this style of implement the 14 drawbar length ensures that both u-joints are angled equally during turns, thus cancelling out the speed fluctuations that each produces individually.
The problem with pull-type mowers like yours is that essentially all the angle is taken up by the single u-joint at the front. Because there's no equally-angled u-joint to cancel it out you'll end up with vibration and chatter. The best solution for when just a single u-joint gets angled is to use a CV joint.
The longer you make your drawbar the closer to being equal angle your two u-joints will become and in theory it will reduce vibration. However, I doubt you'll notice much improvement without making the drawbar freakishly long at which point other issues like driveline length and overlap will become a problem.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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