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Message: <blockquote data-quote="Grzes" data-source="post: 62280" data-attributes="member: 8202"><p>This is a tough call. Sometimes getting a user or part manual for older models is difficult if not impossible, not to mention parts. As far as changing from spline to keyway, it might work, but I wouldn't expect it to last as long as the spline would. In general, the spline system (even though the splines are smaller comparing to a keyway) provides better and tighter fit than the keyway and in general lasts longer . Being an engineer with some mechanical engineering background, I can only say that if it was originally designed for a spline, there was definitely a reason behind that. The driving system gets some significant stresses. Look at the size of the chain in the chain case and you'll figure that out. It might be the case that you will spend time and money on that modification, and it won't last too long. Couple years ago we bought a used farm lawn mower. The cutting disc shafts had keyways. We rebuilt them with making sure everything was tight (I mean man tight...). After two seasons of mowing about 100 acres the keys were close to be shut. We finally sold that mower and acquired another one, with the splines this time. It lasts until today and it doesn't show any wear and tear. Going back to the shop: I would probably try to find a spline collet (maybe MaccMaster, Grainger) and machine the shaft to its dimensions. You may need to harden a bit the materials (after machining of course) to "increase" the grade of your parts. It is all doable and sounds like you have right machines and skills. It will take slightly more time but might be worthwhile at the end of the day. Anyway, kudos to you for determination. Don't disappear and keep us posted with the outcome.</p></blockquote><p></p>

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