overrun clutch

[Hazmat]

My question is, does a 1986 L345DT have a internal overrun clutch. I was told when I bought it that it had a two stage clutch (dual clutch) and it also should have a overrun clutch. I was told today that it might not have a internal overrun clutch and I should get a external one. So now I'm not sure. Any ideas?

 

[D2Cat]

Your tractor, being a two stage clutch, when you push the clutch about half way down you can shift gears as normal. When you continue, and push the clutch further you can then also engage/disengage the PTO.

You need no over-ride clutch hanging on your PTO shaft.

Not sure on your model, but on the L305 there is a lever near where your toe would be when you push on the clutch pedal that you can swing down and limit you to not push any further. This limits you to not push on the second stage when you don't need it.

 

[North Idaho Wolfman]

No the tractor does not have an over running clutch on the PTO, but like D2Cat said you don't need one on a tractor with a 2 stage clutch it's not required.

 

[dandeman]

My Ford tractor has a live PTO drive (independent of ground speed, totally separate PTO clutch) and I put an overrun clutch on the PTO drive for a different reason...

The rotational inertia of the quite large, heavy built brush hog I have is significant and anytime I change (especially on dropping engine speed), you can hear that inertia backlashing and oscilating back through the drive train all the way to the engine..

Thinking that is extra wear and tear on the drive train, I put an overrun clutch on the PTO shaft to eliminate that characteristic. Now when I drop engine speed the brush hog coasts down on its own instead of the energy working its way all the way back to the engine.

 

[Hazmat]

Ok thank for the info. Let me see if I understand. My tractor doesn't have a internal overrun clutch, because it's not needed with a two stage clutch. So I don't need to buy a external overrun clutch to go on the pto shaft.
One reason I'm asking is because when I bought the tractor, I checked the tractor over good ( I thought). Got it home and used for a while. The next week I hooked up to a bushhog,and it grinded bad when trying to engage the pto. A local shop said it sounded like part of my clutch was gone or its rusted together. I can't remember the price now but was kind of expensive. So I just cut the tractor off and engage to pto and crank it back up. So my question if I hit something with the bushhog will it mess any thing up internally

 

[D2Cat]

Hazmat, what you're describing is....you have not pushed your clutch peddle down far enough to engage the second clutch, which is the one you need to activate to allow you to shift the PTO into action.

Maybe your tractor has the stop I mentioned and needs to be rotated up to allow you to get the clutch totally engaged.

You are correct about being able to shut off the engine, then engage the PTO and then start the engine. That is one way to engage the PTO, but not the best to start your tractor with that load on it.

 

[Hazmat]

D2Cat, thanks for the info. I don't recall the stop you are talking about. I don't think mine has that. My tractor grinds no matter if I push in the clutch on the way or half way. As long if there's a pto driven Implement it grinds. I was told to and tried to adjust the clutch pedal (using a diagram in the owners manual ) but no change in the grinding. Back to the overrun clutch, so I don't need a external overrun clutch on the pto for this tractor, Correct? The reason I'm asking cause next weekend is our work weekend at the hunting lease. I will be trying to reclaim old unused roads. There's no telling what I'll be cutting. I will have some in front of me on a atv looking for stumps and stuff, but still don't want to break anything.

 

[Dave_eng]

D2Cat, thanks for the info. I don't recall the stop you are talking about. I don't think mine has that. My tractor grinds no matter if I push in the clutch on the way or half way. As long if there's a pto driven Implement it grinds. I was told to and tried to adjust the clutch pedal (using a diagram in the owners manual ) but no change in the grinding. Back to the overrun clutch, so I don't need a external overrun clutch on the pto for this tractor, Correct? The reason I'm asking cause next weekend is our work weekend at the hunting lease. I will be trying to reclaim old unused roads. There's no telling what I'll be cutting. I will have some in front of me on a atv looking for stumps and stuff, but still don't want to break anything.

I think in some ways you are confusing an overrunning clutch with a slip clutch.

The previous posts explain the reason for the over running clutch and I suggest you look at them again.

The over running clutch does nothing to protect the tractor if you hit rocks and stumps. A shear bolt or slip clutch does that.

Dave

 

[North Idaho Wolfman]

When you're out mowing, when the mower gets into really thick stuff and starts working hard, stomp all the way down on the clutch pedal, do this several times and you will likely break the clutch disk loose, You'll know when it does it.