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Case Tractors Discussion Forum
Show Parts for Model:

Case o matic no direct drive help 611b

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jbshocks

08-13-2017 03:46:37




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I have been working on a 611b and finally have the motor working perfectly. The case o matic lever has always been hard to move in the 20 years we have had it and I didn't know how it was supposed to work so I don't know if it ever worked. Lever now moves freely and all linkage is hooked up. New filter and fresh tch. Com mode works fine. If I put it in direct drive pushing clutch does not return lever to com. Engaging the lever does not lock up the converter. Any thoughts? I plan to attemept some pressure readings but the convertor tap ,if I have the right one is right under the steering shaft and I will need to remove that. Any ideas what I should be looking for?

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kevinthefixer

08-23-2017 06:03:20




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
Yeah I think I'd fix that before putting in the new disk.



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jbshocks

08-22-2017 19:13:39




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
Quoting Removed, click Modern View to see With mine having the tab that kicks it out of direct drive missing it makes sense that it could have stripped the plate that way.



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kevinthefixer

08-22-2017 19:03:55




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
Keep in mind, also: these machines are approaching 60 years old. Mine, at least, has not had the best of professional care. Amazing that they are still working.



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rfdmn

08-22-2017 17:05:42




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
They seemed to hold up well for the people who understood what they were and how the worked and operated them accordingly.



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Jim Pollock

08-22-2017 13:27:45




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
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I bought the tractor this way. Pulling down the lever for direct made no difference at all. No noise it just always drove with fluid drive.



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Jim Pollock

08-22-2017 13:33:41




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 Re: Case o matic no direct drive help 611b in reply to Jim Pollock, 08-22-2017 13:27:45  
I'm assuming what strips the spline is when you lock it up in direct before the torque converter gets the tractor moving. The splines are just made into the clutch material and I am surprised they hold up at all.



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jbshocks

08-22-2017 11:34:42




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
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John

What symptoms did you have? Slight pressure blip when you engaged direct drive and then it still worked as COM only? No noise or anything? Any idea how you stripped the splines?



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jbshocks

08-22-2017 06:03:48




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
Quoting Removed, click Modern View to see He is also the only one in the world with a 164 head gasket.



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kevinthefixer

08-22-2017 05:54:39




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
John Saeli told me that he is the only one in the world who can put together a COM rebuild kit. I believe him.



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jbshocks

08-21-2017 16:38:17




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
are you talking about the fiber disk like this one? http://external_link.com/product/case-400b-530-630-tractor-case-o-matic-direct-drive-plate/



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jbshocks

08-21-2017 16:19:15




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
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You ended up making the fiber disk or was it a metal one? Is this link the dirc you made? http://external_link.com/product/case-400b-530-630-tractor-case-o-matic-direct-drive-plate/



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Jim Pollock

08-21-2017 18:41:23




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-21-2017 16:19:15  
I made the fiber clutch plate. I bought the material the proper thickness and then machined the od and id to size and cut the splines on the inside. I was told by the case dealer that the clutch plate was no longer available but maybe they just didn't know what they were talking about.



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Jim Pollock

08-21-2017 15:27:40




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
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I had a 611b that wouldn't lock up in direct and it turned out to be the clutch disk that is inside the torgue converter. It has splines machined into the clutch lining and the splines were all worn off preventing the clutch disk from locking up the torque converter. I don't think you can buy a new disk. I am a machinist and made my own. then it worked fine.

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jbshocks

08-21-2017 06:06:33




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
Quoting Removed, click Modern View to see Thanks for all your help. I will post back if I decide to dig in.



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mEl

08-21-2017 05:39:22




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
The DD plate is the only thing that is able to be replaced without removal, you are in luck there, just a series of 5/16 capscrews hold the front cover of the converter on and the plate is right there.



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jbshocks

08-20-2017 18:12:27




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
can you remove the front of the converter with it in the split tractor or do you need to pull the converter? If it has to be pulled do you really need to fabricate that lifting tool shown in the book or can a couple of guys pull it out and put it in by hand?



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mEl

08-20-2017 17:59:29




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
. If the pressure stays up with hot oil I would probably just go in And fix the dd issue,maintaining pressure hot would indicate good sealing rings and bushing clearances, the fact that dd holds system pressure indicates the piston seals are good, if Those things check out with hot oil I would be comfortable just taking the front off the converter and replacing the disc, the pressure readings you gave and the pressure dip and returning to normal checks out the hydraulic portion that is why I suspect the internal teeth on the fiber dd disc, now watch it make a fool out of me. I would check with John Saeli on this forum as he stocks some hard to get stuff.

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jbshocks

08-20-2017 16:59:47




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
Quoting Removed, click Modern View to see

So if I decide to split it am I just changing one friction plate? Any preventive items that should be addressed or should the entire com be rebuilt?



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mEl

08-13-2017 19:59:26




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
It is not likely to cause any problems, the disc is fiberous so If I am correct some material could work back to sump. I would be sure to service the filter out in front of the radiator to keep any debris out of the valve and change the TC oil occasionally.



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jbshocks

08-13-2017 19:28:19




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
Quoting Removed, click Modern View to see I am not looking forward to a "simple" tractor split. I don't use the tractor much, mostly to brush hog my trails and snowblower the driveway. Would the tractor survive without direct drive or am I likely to cause damage if I keep using it this way?



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mEl

08-13-2017 11:38:58




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
The pressure is a bit low but not enough for total failure of DD clutch, since your pressure is holding I would suspect that the internal teeth may have failed on DD friction plate. If so a simple BH split and removal of the front of the converter face will let you gain access to it. If the rear bushing had failed the extra clearance would have allowed DD pressure to escape(the common problem). The pressure dipping and then returning is good news. The 35 lb reading showing on the gage is Torque converter pressure which is a good reading also.

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kevinthefixer

08-13-2017 11:06:52




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
I got lucky when I bought my 611B, it came with the manuals.



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jbshocks

08-13-2017 09:04:12




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
I hooked a pressure gage up and I have 107 psi. If I press the clutch the pressure drops to 34. If I move the direct drive lever it dips for half a second to about 90 and returns to 107. Any more Thoughts?



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mEl

08-13-2017 06:48:39




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
If you have a pressure drop on the gage and no direct drive when engaged and the spool is traveling fully your bushing to shaft clearance is loose allowing DD pressure to escape, it will be a complete removal to repair and there were mods adding a hook type sealing ring to help seal DD pressure. Have successfully built up the bearing surface on the little pto driveshaft and turned back to restore bearing area then added the new type seal.

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Bret4207

08-13-2017 06:19:04




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 Re: Case o matic no direct drive help 611b in reply to jbshocks, 08-13-2017 03:46:37  
I will leave it to the experts to discuss why it won't lock up (pump?), but as far as stepping on the clutch and it not going back into COM, there is a tab that sticks out off the clutch rod down at the COM housing that has to be there to push the linkage out of direct and back into COM. Without that you have to manually move the COM lever to get out of direct. Not sure if that 's the problem, but it's a place to start.

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