Picked up half a megawatt worth of Caterpillar power, think I'll make a PTO generator

[mapper]

Never heard of that, looked it up. That's absolutely a good idea and I hadn't even considered a need for something like that. I would hate to put in all that work for a solution to get head up to speed without damaging the PTO clutch, only for it to be destroyed by an unexpected shutdown of the tractor. Thank you very much for the suggestion! I will do it!

Most modern tractors have an over running clutch built in. If you have run a brush hog or similar attachment and heard a rapid clicking sound when cutting the throttle or if you can engage the PTO with the engine off and still turn the PTO stub shaft in the clockwise direction, your tractor has an overunning clutch.

 

[LouNY]

Most modern tractors have an over running clutch built in. If you have run a brush hog or similar attachment and heard a rapid clicking sound when cutting the throttle or if you can engage the PTO with the engine off and still turn the PTO stub shaft in the clockwise direction, your tractor has an overunning clutch.

They have some over running ability but most of them have a brake which can be burnt out by a large rotating mass.

 

[pmsmechanic]

Interesting discussion here.

 

[Industrial Toys]

I get the impression that my JD 6200 with an electrically activated PTO does not try and slow down my 1000# cutter wheel in my wood chipper at all, when disengaged. It rolls on seemingly forever and to a slow stop, suggesting to me, no brake. EDIT The chipper DOES have an over running clutch, which may come into play when throttling down, but I don't think it comes into play with the PTO disengaged. I usually cut the PTO, then throttle down. If the tractor quit unexpectedly, it is nice to know that clutch is there.

Thinking about it, I don't think any tractor I have had or used, had a PTO brake.

I should call my Mennonite JD Experts (Martin Farm Service) and talk to people who actually know these tractors on the inside.

 

[texasranger556]

If it has one it could be broken. Attached is the PTO brake basket out of a JD4300. Note the crack.

 

[strantor]

Looking at overruning clutches, I got off track and started looking at slip disk PTO clutches. I still want the overrunning clutch, but what do you guys think about, instead of a separate starter motor to get the rotor up to speed before engaging PTO, what if I just installed a cheap PTO slip clutch and let that clutch take the abuse of the hard start instead my tractor's internal PTO clutch? so it would go PTO output> PTO shaft> slip disk clutch> overrunning clutch> intermediate shaft with large sprocket>chain> rotor shaft with small sprocket. It would probably slip quite a bit upon engaging the PTO, before the rotor finally gets up to speed. Maybe it would slip enough to burn up? Maybe it would be just fine? I don't really know; I have zero experience with these things.

 

[texasranger556]

Is your PTO engagement electric or mechanical? If mechanical, via clutch pedal or a lever?

 

[Industrial Toys]

I posted a picture of my chipper clutch on here last year, as I didn't know what it was or does.

That baby screams (and smokes) when the power is applied. I found that kicking the PTO clutch momentarily to get the thing moving, then applying it for good works best, but I am not sure why.

It is a compact unit that goes on the shaft. Over-running and friction clutch. I would recommend one for your application.



I don't remember the make. I would have to do some digging.

 

[strantor]

Is your PTO engagement electric or mechanical? If mechanical, via clutch pedal or a lever?

Electrical

 

[pmsmechanic]

I think you are being pushed into over thinking the inertia load. I wouldn't worry about it until you have some experience with actually running it. If your engine wants to stall then push the pto switch off before it stalls and engage it again before the pto brake applys. With a bit of experience you'll have it figured out.