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Case Tractors Discussion Forum
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Caseomatic operation?

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Dan J

06-20-2004 05:46:39




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I just bought a Case 911b with the caseomatic transmission. It has 4 speeds and hi/lo range. The tractor will only move with the right hand dash lever all the way down. Once you are rolling you can push the lever up but it dosn't change anything. Am I missing something here? What is the proper operation of this lever and what do I do to fix whatever the problem is. I will get the book asap but thought I'd check with the experts first. Thanks, Dan

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Dan J (GOT HER FIXED!)

06-21-2004 20:14:22




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 Re: Caseomatic operation? in reply to Dan J , 06-20-2004 05:46:39  
Thanks for all the help guys, I started checking filters and everything I could find until my manual gets here. Found that the pin that holds the clutch to a valve had lost the c clips on it and was partially out of the valve end. The clutch would push the valve in but not pull it back out again. 2 ten cent pins and I'm pulling in torque converter mode now. Now if I knew where to get a set of rings I'd start on the engine. Lots more questions but I'll start another thread some other time. Thanks again for all the replys. Dan

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BLR

06-20-2004 20:28:51




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 Re: Caseomatic operation? in reply to Dan J , 06-20-2004 05:46:39  
The case-o-matic should pickup the load by adding throttle. If it's not there's something wrong. Get a manual, check all the filters, and change the oil. Then go to work on the vavles. My recommendation would be to get the torque converter working properly because if you have to use the direct drive clutch to move the tractor it won't be long before that's ruined.



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JimB

06-20-2004 09:48:43




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 Re: Caseomatic operation? in reply to Dan J , 06-20-2004 05:46:39  
The Case COM Tranny utilizes a Torque Converter instead of a conventional friction clutch. The 'clutch' pedal actually moves a hydraulic control valve that dumps torque converter pressure, disengaging engine from trans, and therefore allows manual mechanical gear selection. The gearbox is a 4-Speed + reverse with a hi-lo range, which makes 8-speed forward + 2-speeds reverse. After gear selection, at idle, the pedal linkage defaults to always start ground drive in torque converter (fluid) drive. After the draft load has been brought up-to-speed, using the throttle (like a car with an automatic that doesn�t upshift) the lever on the dash engages direct drive, which hydraulically 'locks-up' the torque converter. This may increase ground speed depending on draft load. In essence making it like a no-slip friction clutch. When pulling an implement, if the draft increases due to ground condition or perhaps a hill, the dash lever returns the system back to torque converter drive which increase wheel torque and will usually pull the load through a hard-spot in the field. Some bulldozers, a CAT D4 for sure, have a torque converter drive without the lockup feature. In my opinion, the COM tranny provides the best operator choices of operation and was ahead of it's time. But, as you certainly realize, the operator must understand how it works in order to utilize it's capability properly.

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ted

06-20-2004 07:48:58




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 Re: Caseomatic operation? in reply to Dan J , 06-20-2004 05:46:39  
Dan, you must have hit the wrong key. Case did not make a 911b. The biggest tractor they put COM in was the 830. Regardless it sounds like you may have a problem. Check the simple things first, like fluid level. I don't understand your handle problem, never ran into anything like that. Obviously, your clutch must work, right?



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bill koob

06-20-2004 07:28:30




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 Re: Caseomatic operation? in reply to Dan J , 06-20-2004 05:46:39  
I assume you had a typo and the tractor is an 811b. C-O-M does not change speed much but does shift from fuild coupler to direct drive when you pull the lever back. The tractor always starts in fuild drive.



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Dan J

06-20-2004 09:13:57




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 Re: Re: Caseomatic operation? in reply to bill koob, 06-20-2004 07:28:30  
Sorry, The tractor is a 611B, It starts with lever foreward but won't move until you pull the lever back. Then it hesitates a few seconds and goes. Is it supposed to move with the lever foreward (fluid coupler)? What is the advantage of running it in either position? Thanks again.



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DCTOM

06-20-2004 09:41:39




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 Re: Re: Re: Caseomatic operation? in reply to Dan J, 06-20-2004 09:13:57  
DID YOU OPEN THE THROTTLE WITH THE LEVER UP?? IT IS FLUID AND MAY NOT MOVE IF ENGINE NOT SPEEDED UP



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Dan J, Update

06-20-2004 15:10:42




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 Re: Re: Re: Re: Caseomatic operation? in reply to DCTOM, 06-20-2004 09:41:39  
Thanks for your patience fellas but I am beginning to grasp the consept. The clutch will stop the tractor but not start it. It will only move (regardless of rpm)by letting the clutch out and pulling the lever down. I did look at the pressure guage and it looks to be around 20# max. When you pull the lever back, pressure drops to 0 and tractor moves. Looks like a pressure problem? What is my next move? Thanks again

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Art Mathewson

06-20-2004 19:11:51




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 Re: Re: Re: Re: Re: Caseomatic operation? in reply to Dan J, Update, 06-20-2004 15:10:42  
With the engine running and the petal released, the pressure should be about 125 psi on the gauge below the dash. If the oil is cold it may take a few seconds to come up and of course reving the engine will get it there faster. The COM should move the tractor though usually slower than when you pull the lever down. Is the gauge working under the dash? If the prssure won't come up there are probalbly afew things it could be; low fluid, the wrong fluid, stuck or clogged converter regulator or a clogged clutch regulator. As far as fluid goes, 18 years ago when I got my 611B I asked the Case dealer what to run in it and he said Dextron 2 which I have run all these years without any problems other than an occasional stray piece of dirt clooging a valve.

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Joe

06-21-2004 10:29:13




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 Re: Re: Re: Re: Re: Re: Caseomatic operation? in reply to Art Mathewson, 06-20-2004 19:11:51  
I also own a 611B. It sat for close to 12 years when i recently fired it up last year. When the tractor was cold and i revved the engine up it seemed to move fine. After a few trips around the farm i realized that the tractor began to move slower and slower as a result of the fluid getting hot. Even if i pulled the right lever down into direct it still would not lock up correctly. I couldnt get it to climb a slight hill at full rev. After a day of research I finally found the problem. The Filter in front of the radiator in a canistor type housing was completely clogged. I replaced this one and the one right underneath the battery trey and the tractor pulls like a D9 CAT. Well not exactly but it sure doesnt slip anymore. Just some advice for you. Also the filters cost me about 6 bucks a piece at my local case dealership.

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