PTO Thingamajig. Any body know what it is?

[Steave]

I'm not sure why he needs to take it apart. There is no indication that it isn't functioning properly. As mentioned, if the tractor is bogging down it is the chipper/flywheel, not the slip clutch. The clutch has nothing to do with the load of running the implement, only shock loads. So unless the OP is worried that it isn't slipping then there is no need to take it apart.

The indication that it not working properly is that it's bogging the tractor down on start up. If it's working properly it should allow some slippage until the heavy flywheel is up to speed. It will heat up while doing this is the reason for the heat sink fins. That's my take on how it works and I'm only wrong every now and then so watch out this maybe one of those times.

 

[N80]

The indication that it not working properly is that it's bogging the tractor down on start up. If it's working properly it should allow some slippage until the heavy flywheel is up to speed. It will heat up while doing this is the reason for the heat sink fins. That's my take on how it works and I'm only wrong every now and then so watch out this maybe one of those times.

Could be. Must be a monster of a flywheel to bog a 70 hp tractor that already has its own 'clutch' to get things rolling. And if that is the case, and if that specific slip clutch is designed to assist in start up of that big flywheel then yes, the OP needs to be very careful when he takes it apart. Those springs will be stout indeed. He might be able to just loosen it without completely taking it apart.

I can smell the slip clutch on my rotary cutter immediately when it slips. Otherwise I'm not sure how you can tell if one is slipping or not.

 

[jenkinsph]

I'm not sure why he needs to take it apart. There is no indication that it isn't functioning properly. As mentioned, if the tractor is bogging down it is the chipper/flywheel, not the slip clutch. The clutch has nothing to do with the load of running the implement, only shock loads. So unless the OP is worried that it isn't slipping then there is no need to take it apart.

Not enough is known about the condition it is in, that is why I recommend taking it apart and inspecting it.

 

[Steave]

Could be. Must be a monster of a flywheel to bog a 70 hp tractor that already has its own 'clutch' to get things rolling. And if that is the case, and if that specific slip clutch is designed to assist in start up of that big flywheel then yes, the OP needs to be very careful when he takes it apart. Those springs will be stout indeed. He might be able to just loosen it without completely taking it apart.

I can smell the slip clutch on my rotary cutter immediately when it slips. Otherwise I'm not sure how you can tell if one is slipping or not.

You're right the springs would be stout. The bolts that hold it together should be long enough to let the spring pressure off before removing them. To be on the safe side take out two bolts across from each other and install another bolt a little longer for holding it while removing the rest of the bolts. You'll know by then if the pressure is released.

 

[TerryR]

The indication that it not working properly is that it's bogging the tractor down on start up. If it's working properly it should allow some slippage until the heavy flywheel is up to speed. It will heat up while doing this is the reason for the heat sink fins. That's my take on how it works...

As I noted above, that's also how the manufacturer describes the purpose of the device: "This is valuable during start up of high inertia machines..."

 

[spokane 1]

he really doesn't need to take it apart .....when the clutches are completely worn the drum will not engage.

to properly engage a chipper drum it takes time the engage lever is slowly applied to get the 1200lb steel drum spinning at engine speed usually 500-2000 rpm
my chipper takes a full minute to engage the 1200lb drum. I can kill the 110hp diesel engine with a quick toss of the lever. He only has a 45hp motor. it'll take some time to get that drum up to speed.

this is like starting a car in 3rd gear it takes a bit of slip at the beginning to finally get the car moving.

 

[TerryR]

he really doesn't need to take it apart .....when the clutches are completely worn the drum will not engage.

The problem is not that the clutch is slipping, but that's it's failing to slip on startup as it is designed to do.

 

[CobyRupert]

I can smell the slip clutch on my rotary cutter immediately when it slips. Otherwise I'm not sure how you can tell if one is slipping or not.

Use a marker to put aligned indications on each side of it. Give it a quick start or go "mow" a big rock and see if marks are still aligned.

 

[Industrial Toys]

Thanks for the response. Better then from Bandit from who I still have not heard back from.

The chipper has a thousand pound cutter wheel and is sped up from the tractor via a six belt pulley. The tractor, a JD 6200 needs two thirds throttle to get that thing going or it will stall the engine. A friend says he ran a JD 7800 with a haybine and it too required lots of throttle to prevent stalling on startup, so I am glad that such situations occur in farming and maybe JD engineers allow for this abuse.

I am a little worried that the PTO brake on the JD will get too much wear from trying to stop that cutter wheel and would have liked an over running clutch.

I did play with the chipper a bit, and it will gobble up a twenty foot long 8" pine tree without slowing down much before it's done.

 

[sixdogs]

An 8" pine log takes a lot of HP to chop up. Just for the heck of it I would try to call the manufacturer or someone that makes something similar. There is a lot of demand that could, or could not be placed on your engine. I have heard of crankshafts breaking from excessive demands placed on them. Not saying that's a problem but a little investigating might be in order considering the consequences of something going wrong. I'm a little too cautious at times so it's my personal opinion. Then again, I've never had a disaster.