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Hello, I'm in the process of fixing up a 1969 JD 60 for our youngest grandchild and I've had to undertake some major changes/fabrications. I seem to be good on working everything out but the belt. I've replaced the worn out Tecumseh with a 5.5 hp Predator motor and that's fine. I've dealt with the engine brake problem on the Predator and that's fine. It starts (pull start) and runs but throws the drive belt. I'm at a loss to know why. I am posting some pics here in the hope that some knowledgeable person might straighten me out on this. Thanks in advance. Train JD BELT 1.JPG JD BELT 2.JPG JD BELT 3.JPG
 

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I have never worked on a 60 so I may be way off base. Is there an idler or guard missing on the right side looking at the picture? If that engine spins clockwise (looking at it from the pictures perspective) there is too much angle in the belt travel. The belt is hitting the lip of the bottom pulley and being flipped off. If it spins CCW that’s not the case and it may be an imperfection in one of the pulleys.


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Thanks...I'm not sure if it turns clockwise or counterclockwise. There is no belt guard. The only solution I can think of is to try a belt with less tension (in changing engines the normal belt length goes out the window) and see if that helps. I'd like to install a horizontal dead-man pulley somewhere in the neighborhood of the steering gear to put inward pressure on the belt at that point and to "straighten out" the angle off the rear drive sheave but that area is so gommed up with stuff I don't think I could get one in there. Thanks for the response. I appreciate it. Train
 

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I've had the same experience...fixing up 60 for grandson. I dropped in a Predator 5.5 with no trouble and connected the throttle and choke to the dash via some old cables I had. They work fine, but I have the same problem with the belt throw. The angle from the rear pulley to the front, vertical engine pulley seems to be too excessive so I think I'll unbolt the motor and physicallly move it over a bit to lessen the severity of the angle. I know I won't be able to hook up the mower deck, but at least it will run and he can run it around the yard. I don't know if moving the motor will work or not, but I'm going to try it when the weather breaks.
 

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Very interesting...I'm not sure, but I don't think mine has those guards. If not, I can fabricate them. They seem simple enough and may solve the problem. Thanks John. Doc
 

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I looked on line, looks like the 6.5hp predator rotates ccw, so I would assume yours does as well. Also seen a manual for a 60 showing the belt is correct, not reversed. The gaurd that I seen in the pictures look to be the ones on the trans side of the belt system. They are there for the clutching, so belts stay where intended. I don't recall having them for engine to jackshaft. Looks like a flat plate mounted to the bottom of the frame with a rod welded to it close to the jackshaft pulley would answer your problems. I would be thinking of a bearing slid on the rod that pushes on the belt should do it. Not the correct fix, but should work. I don't know how tight the belt is, but shorter may result in slippage, angle still be the same.
 
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