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Restoration & Repair Tips Board

IH 856, Need help on clutch or torque amplifier

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Steve Henry

04-26-2006 16:23:26




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I have begun to experience what feels like the clutch slipping on my IH 856. I went ahead put a new clutch disc/plate and resurfaced the flywheel. That seemed to fix the problem for about 20 hours of use. Now, the tractor appears to "slip" again. I don't know much about the torque amplifier systems, but I'm beginning to suspect it and I found that if I shift that handle back and forth, and the tractor is in the low gears, it will respond by grabbing and begin to move. Also, when I rapidly move the steering wheel back and forth, somehow that affects the hydraulic pressure and causes the torque amplifier to "grab" and the tractor will slightly move. When I am in a low gear the tractor will usually work along more or less. Sometimes the tractor won't move at all, other times it just begins to work fine. Is there a risk in working the tractor with this problem? I mean can I just get by without doing something right away or am I about to break something. I'm just wondering if there is something easy I should do first before I disassemble that torque amplifier system and try to figure out what I need to do. Thanks for the help or suggession, Steve

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430WLPG

04-26-2006 16:50:09




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 Re: IH 856, Need help on clutch or torque amplifie in reply to Steve Henry, 04-26-2006 16:23:26  
Does it make any difference if the T/A handle is up or down? Usually when a TA goes to slipping it will be in low side and the high side is fine,But sounds like you are losing lockup pressure,Does it still have a flashing red light on the right side of the steering column? There is a Main control valve on the left side of the speed trans and it has a sending unit on the back towards the axle, is the wire hooked up? if not hook it up and see if the light goes out when you start moving.It should come on any time the clutch is down,because you dump pressure with the clutch down and should go out just as you start to move and build pressure and it will come on anytime the pressure is not there. There could be either a stuck flow control valve or a leak some where. Does the steering work fine? If so the TA may have a blown seal

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Steve Henry

04-27-2006 09:57:22




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 Re: IH 856, Need help on clutch or torque amplifie in reply to 430WLPG, 04-26-2006 16:50:09  
I think you are correctly identifying the problem as the lockup pressure. When the T/A handle is either forward or back, the slipping is about equal. When I move the T/A handle back and forth, I does seem to help the tractor reengage or build the lockup pressure. There is the red light as you mention, and the wire is hooked up, however it does not work. I don"t know if there is a light bulb problem or a wiring issue. The power steering works fine. If there is a blown seal in the T/A is that something that I can disassemble and put some replacement parts in? Or are there special tools involved?

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the tractor vet

04-27-2006 19:09:13




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 Re: IH 856, Need help on clutch or torque amplifie in reply to Steve Henry, 04-27-2006 09:57:22  
To fix the teltale lite is not a big deal if ya don't care about the blinking buld any Ge 57or 1895 bulb will work and it is not that hard to replace two ways that it can be done one is pull the cowel off the othere is just pull the right dash panel back a bit but be care full not to short any of the electrial connections out . As far as lock up pressure you can check that with a Hyd pressure gauge that can handel up to 600lbs and the place to check it is on the bottom right side of the MCV but you will have to get a fitting that will go in where the plug is now off the top of my head i do not remember the size as the fittings that i have are in my test fitting box and it requiers a O/Ring . Lock up pressure on a 856 should be around 235-265 and i like being on the high side . Now if pressure is down then check the free lenght of the two pressure reg. springs and you will need and I T manual as they are listed . I do not have my books in the house as they are out in the truck or i would tell ya the lenght of each they are found under the top plug on the top right of the MCV now if you remove that plug becareful as it is SPRING LOADED . Now on the other thing if you have installed a new clutch did you have the flywheel cut or ground down if you did did they get the step hight set correctly there have been a couple times sofar this year that guy have done a clutch job and the machine shop cut the face and not the step and this will cause the same problem as the pressure plate does not have the proper pressure to the disk and in a couple hours of run time the new clutch is slippen . Ya got any ferther problems get ahold of me on the Farmall board . I can walk ya through the whole tractor.

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Steve Henry

04-27-2006 22:23:32




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 Re: IH 856, Need help on clutch or torque amplifie in reply to the tractor vet, 04-27-2006 19:09:13  
Tractor vet, your information is very insightful. I will check the pressure as you suggest. In regards to the IT manual, I just ordered one since some of this problem is turning towards a technical side. Plus anyway, I mostly deal with non-T/A stuff and don't have any experience with this until now I have an 856. As for the clutch stepdown cut, the machinist did in fact carefully size that too. Actually, I know this whole situation has nothing to do with the clutch, since now that I have been looking into this situation, all the symptoms are obviously T/A related. Now, I don't doubt there may be a simple solution say with the adjustments (I was reading through some of the earlier dated forum information), however, I will check everything, linkage, pressure, and whatever else I stumble across. Thank you for the detailed information, it is a big help. Steve

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430WLPG

04-27-2006 16:53:45




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 Re: IH 856, Need help on clutch or torque amplifie in reply to Steve Henry, 04-27-2006 09:57:22  
The worst thing about working on a TA is that it has to come out to do anything to it and that said the speed trans. is the section between the engine and the brake housings has to come out.I work at a Case dealer and have never tried to split the speed trans. out without the splitting stands. And unless you really like that TA, I would take it out and throw it away and put in a straight shaft,with a straight shaft it is the same as being in high range you just lose low.But if you need the TA I would just replace it because of the major amount of work to try to fix or replacement.If you wanted to try to fix it youself your going to need a manual,I don't type very good so it would be too much for me to walk you through it on here.

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THE TRACTOR VET

04-27-2006 18:51:23




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 Re: IH 856, Need help on clutch or torque amplifie in reply to 430WLPG, 04-27-2006 16:53:45  
Now that is the dumbest advice i have ever heard , as that will take 2000 bucks off the resale of the tractor . Why didn't ya tell him how to check the pressure .



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