Bush hog 306 drive shaft

How can i mount this drive shaft on slip clutch none i see these days have hole in splined shaft....would it weakin or ruin temper in shaft to drill hole in it...dewy

You mount the slip clutch on the tractor PTO, then connect the mower PTO to that.

We have to make sure we are talking about the same thing. Overrunning clutch goes on the tractor, but he may be wanting to put a slip clutch between the gearbox
and the pto.

I did that exact thing to attach a slip clutch to my Bush Hog 305.

Never , or at least not the accepted way, clutch need to be back at the implement, buy mounting it
at the tractor you move the u join too far out and risk failure.

(quoted from post at 09:31:28 06/14/22) Never , or at least not the accepted way, clutch need to be back at the implement, buy mounting it
at the tractor you move the u join too far out and risk failure.

Click to expand...

I've looked at these slip clutches and they are CLEARLY designed to be mounted on the tractor PTO.

Unless you have a machine shop at your disposal there is no way to cross drill the shaft and hub to mount it in the implement. Try it on a drill press and it's going to come out crooked and be a complete mess.

(quoted from post at 09:31:28 06/14/22) Never , or at least not the accepted way, clutch need to be back at the implement, buy mounting it
at the tractor you move the u join too far out and risk failure.

Click to expand...

Oh and on the u-joint failure it doesn't matter on mowers with the long shaft that goes direct to the gearbox.

The 3pt types stay straight and the trailer types will tear the shaft apart if you do much turning with them running anyway.

(quoted from post at 13:47:02 06/14/22)

(quoted from post at 09:31:28 06/14/22) Never , or at least not the accepted way, clutch need to be back at the implement, buy mounting it
at the tractor you move the u join too far out and risk failure.

Click to expand...

I've looked at these slip clutches and they are CLEARLY designed to be mounted on the tractor PTO.

Unless you have a machine shop at your disposal there is no way to cross drill the shaft and hub to mount it in the implement. Try it on a drill press and it's going to come out crooked and be a complete mess.

Click to expand...

Please post documentation that shows they are designed to be mounted on the tractor, everything I find says mount on implement, not the tractor shaft. Mounting on the tractor shaft also throws the 14" standard off for U-joint location as related to the pin hole in the drawbar, unless one extended the drawbar equal to the length the slip clutch adds.

One does not need to drill a hole in the slip clutch yoke if they use a clamp on type. At most a spline or two would need a slight relief ground into them for the clamp bolts to pass by the spline. The relief also acts as a keeper to prevent the clutch from being pulled off or slipping off the shaft.

As far as the yoke on the shaft, it can be changed to a snap on one like the tractor end uses, if not able to purchase a slip clutch with a hole already in the shaft.

This post was edited by Jim.ME on 06/14/2022 at 12:56 pm.

That's an overrunning coupler, not a slip clutch.

(quoted from post at 12:43:41 06/14/22)
Please post documentation that shows they are designed to be mounted on the tractor, everything I find says mount on implement, not the tractor shaft. Mounting on the tractor shaft also throws the 14" standard off for U-joint location as related to the pin hole in the drawbar, unless one extended the drawbar equal to the length the slip clutch adds.

Click to expand...

You don't need "documentation." Simply look at the clutch.

The 14" standard is not relevant on a long single PTO shaft like this. It only works if there is another U-joint exactly 14" on the opposite side of the draw pin for "equal angle."

I have a 306 Bush Hog myself. The PTO starts knocking if I turn very far with it because the PTO shaft is one-piece from the gearbox to the tractor. It's 14" from the end of the PTO to the drawbar hole, and that doesn't make a lick of difference because it's 4' from the pin hole on the clevis to the gearbox.

Jim I am like you would like to see his documentation that they are Designed to be tractor
mounted nothing I can find. Ever thing I find says implement guess we learn something ever day .

(quoted from post at 16:32:48 06/14/22)

(quoted from post at 12:43:41 06/14/22)
Please post documentation that shows they are designed to be mounted on the tractor, everything I find says mount on implement, not the tractor shaft. Mounting on the tractor shaft also throws the 14" standard off for U-joint location as related to the pin hole in the drawbar, unless one extended the drawbar equal to the length the slip clutch adds.

Click to expand...

You don't need "documentation." Simply look at the clutch.

The 14" standard is not relevant on a long single PTO shaft like this. It only works if there is another U-joint exactly 14" on the opposite side of the draw pin for "equal angle."

I have a 306 Bush Hog myself. The PTO starts knocking if I turn very far with it because the PTO shaft is one-piece from the gearbox to the tractor. It's 14" from the end of the PTO to the drawbar hole, and that doesn't make a lick of difference because it's 4' from the pin hole on the clevis to the gearbox.

Click to expand...

I can't say I have ever seen one shown as a tractor PTO shaft accessory. If they were supposed to be on the tractor shaft I think it would be used as a selling point, buy one and use it with all your PTO driven implements. I must have missed that sales pitch.

Why do slip clutches come on the implement end of new PTO shafts, not the tractor end? Why do drawings of them show the slip clutch as the implement end? Why are slip clutches accessories you can purchase with implements (if not standard equipment on the gearbox end of the PTO shaft) to replace gearbox shear bolts? Why do they come with a sticker like the one in the picture below on the snap pin ones, if they are ok to put on the tractor PTO shaft?



You are entitled to your opinion, as I am mine. We will continue to respectfully disagree on this. Yes, the ones (with the snap pin lock like a tractor end disconnect yoke) look like they could go on the tractor, but the one I have hands on, says it doesn't belong there. You have shown me nothing, beyond your opinion of how it looks to you, to contradict the printed info I have seen on numerous manufacturer's sites.

The biggest reason I see for mounting the slip clutch at the implement is the room for the clutch to turn without hitting other things turned or not. Also most are different size for different loads and HP ratings so it would not be practical to put the clutch at the tractor. Yes I've seen slip clutches on Agri-Supply on the end of the PTO shaft. They would go on the implement end with the drive/PTO shaft on the front side to the tractor. Can you imagine trying to get a 10 inch slip clutch to clear and turn on some tractors?