Mud Motor U-Joint

Elementary problem. You need a double cardan or CV type of joint. U-joints need to be run in phased pairs to cancel out the vibes. If you really want to run a single u-joint, you might need to weld that slip yoke solid, but I don't think you'll get good performance out of a single joint no matter what you do. I'd consider splicing in a CV to replace that u-joint for best results.
 
Or, just zap a couple more welds on an go huntin' ;)
 
pontiac428 said:
Elementary problem. You need a double cardan or CV type of joint. U-joints need to be run in phased pairs to cancel out the vibes. If you really want to run a single u-joint, you might need to weld that slip yoke solid, but I don't think you'll get good performance out of a single joint no matter what you do. I'd consider splicing in a CV to replace that u-joint for best results.
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Well I guess I got bad mud motor plans (called for a single u-joint), I don’t think there would be room for another u joint, maybe this? https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/132180194926 I could find any 3/4” to 3/4” cv joints. If I could find a applicable cv joint that works I would install it but I’m considering welding the u joint but the downside would be not being able to take the motor off if the need arises.


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Ok, on our kart motors we use a bolt to hold on the clutch, I seem to remember that hole in the end of the PTO being 3/8 fine thread (maybe 5/16). If you weld a thick washer inside the CV joint you could run a bolt up into the PTO shaft on your motor then re-assemble the CV joint. You'll have to take the CV joint apart to do it but that shouldn't be a big deal.

John
 
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