40c - Clutch Dragging?

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hydrogeo
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40c - Clutch Dragging?

Post by hydrogeo » Fri Aug 29, 2014 8:57 am

I've noticed recently that the clutch is starting to drag on my 40c. If I start it in neutral I have a heck of time getting it into gear without severe grinding. However, once in gear I can drive, then clutch and shift between any gear and reverse without an issue. Clutch does not slip, and machine runs, drives, and pushes fine.

This is a big problem, as I have a Carco winch that runs off the trans input shaft, so with the input shaft not disengaging in neutral I can't engage the winch without that grinding.

The machine has been sitting for awhile, so it may loosen up when I start running it again in the fall. However, I am concerned that it could be something with the pressure plate. Any thoughts would be appreciated!

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Stan Disbrow
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Post by Stan Disbrow » Fri Aug 29, 2014 9:13 am

Hi,

There is a tip on the trans input shaft, called a pilot shaft. It sits inside a mating hole in the center of the crankshaft. Could be dirt, crud, rust, etc binding the pilot shaft in the bushing some.

Might be some rust scale on the flywheel and pressure plate, too. Although this would 'burn off' in short order when using the machine and then the problem automatically goes away.

You do have 90 wt gear oil in the trans, right? I have seen where some folks use hydraulic oil in the old stuff by mistake, and then have this issue as well. And, if they keep running hyd oil, they have a lot more serious issues before long......

Stan
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hydrogeo
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Post by hydrogeo » Fri Aug 29, 2014 10:01 am

Thanks for the thoughts. There's only about 40 hours on new 90w in the trans, so that should not be an issue. I had the shift cover off last fall and everything looked fine. Again, it's been sitting so maybe it will free up. It's just coming up on woodcutting season and I need my winch!

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jtrichard
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Post by jtrichard » Fri Aug 29, 2014 10:02 am

Could be getting oil from trans OR engine on the clutch and that will make them drag very bad ...it don't take much either
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hydrogeo
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Post by hydrogeo » Fri Aug 29, 2014 1:40 pm

Never considered that. Motor has a few hundred hrs on a complete rebuild, so I would be surprised if it was a main seal but never know.

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gregjo1948
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Post by gregjo1948 » Sat Aug 30, 2014 4:32 am

I think a faulty throw/out bearing could be the problem. gregjo1948
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Howard Yoder
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Post by Howard Yoder » Sat Aug 30, 2014 5:51 am

Is there any place mice could have gotten in there ( timing hole cover not in place) they can cause headaches

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wizner85
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Post by wizner85 » Sat Aug 30, 2014 9:11 am

I'm guessing clutch disk has been over torqued somehow and has a kink in it, which will disengage the tractor from driving, but still will cause just enough pressure to spin the shaft and grind the gear when in neutral to whatever tranny gear you are going into. Once in gear you can shift from gear to gear quickly.
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Lavoy
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Post by Lavoy » Sun Aug 31, 2014 11:09 am

You are going to have to split it to find out, no other way.
Check pilot bearing, rust or crud on the splines or clutch dust and crud build up on the outer surface of the clutch disc binds against the inside of the flywheel and creates drag. Just did one on a 440 gas.
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hydrogeo
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Post by hydrogeo » Sun Aug 31, 2014 12:58 pm

Thanks for all the input. I have a bunch of little issues that have been slowly adding up anyway that will require a significant front end teardown, so going a little farther and pulling the motor shouldn't be all that big a deal.

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Post by Lavoy » Sun Aug 31, 2014 2:57 pm

Depending on attachments, engine is not all that bad. You can leave rad on and full of water, just drain it down below temp gauge port.
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original possum
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Post by original possum » Mon Sep 01, 2014 2:17 pm

Before you split it take all the free play out of steering clutch travel and see if it makes a difference. Don't split it if it is okay. Just restore free play and run it awhile.
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Post by original possum » Mon Sep 01, 2014 2:18 pm

Sorry. Make that foot clutch.
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