PTO Clutch

[jparsons]

"The 3 cone point screws lock the PTO between the internal snap ring and the back side of the bearing proper." Yes I knew that, my thoughts were that because I only had two of the three cone point screws contacting the backside of the bearing, the whole PTO was likely to wobble when the brake was applied and the thrust button therefore did not depress the springs. I maybe be totally confused about the effect on the mechanism when the PTO is not snugged firmly against the bearing but that is my layman's deduction. Am I wrong? Thanks!

 

[mfrade]

I doubt it could wobble as the brake would be pushing against it. If the button did not act against the springs, the clutch would stay engaged and continue to rotate the pto.

 

[dschwandt]

Providing you can get ALL the setscrews out and the threads are not overly damaged, that unit can be rebuilt.

 

[bwstevens]

The threads can be repaired and the screws can always be removed wether turned or drilled

 

[jparsons]

"If the button did not act against the springs, the clutch would stay engaged and continue to rotate the pto." That comment seems to confirm my diagnosis because my problem is that the clutch stays engaged and does continue to rotate the PTO when I apply the brake against the button.

I have studied the diagram of the PTO extensively and watched youtube videos on the PTO and I still do not exactly understand how pressure on the springs translates into he clutch disengaging the PTO. How the heck does that work mechanically?

 

[bwstevens]

It's going to be hard to explain. The spring or springs push on the three levers which in turn pull on the bolts which pulls the steel plate against the fiber disk and towards the pulley casting. Press on the button and the levers move to loosen the three bolts .

 

[jparsons]

It's going to be hard to explain. The spring or springs push on the three levers which in turn pull on the bolts which pulls the steel plate against the fiber disk and towards the pulley casting. Press on the button and the levers move to loosen the three bolts .

That was a short but precise explanation. Thank you very much. After again studying my PTO, I now can pretty much conceptualize how this works. Very ingenious.

I still cannot see how the bearing drives the pto. I understand how the PTO is attached to the bearing (set screws and snap ring hold it in place). And I undestand how the bearing is attached to the crankshaft (bearing is attached to the collar which is attached to the crankshaft). But with the pto off, I can spin the bearing without the crankshaft spinning. What makes that bearing lock up so that its outer diameter spins and drives the PTO?

Now that I understand this thing, I think most of my problem is associated with the bearing not being flush with the end of the crankshaft. It is too far in. I'll fix that and also keep working on getting those last two set screws out of the pto but the inner cone shaped one is sheared off and the outer one has the hex socket completely destroyed by a previous owner.

 

[bwstevens]

The bearing is so that the pulley spins on the crankshaft. The fiber disk does the work as it is captive in the basket part . Hence the need to sandwich the pulley casting the fiber disc and the steel plate.

 

[bwstevens]

If you are careful you can drill out the set screws with a cobalt or carbide drill . Search for my post here on that. You are lucky as it sounds like you have the clutch off the engine.

 

[jparsons]

Finally, I understand how it all works. Thanks for your patience and knowledge.