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Case Tractors Discussion Forum
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Case-O-Matic, Anyone have time to explain

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David811B

11-25-2003 10:43:56




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I saw some talk about it below but no details. My tractor has it but I do not know how to use it properly. Anybody got time to explain proper use of COM?




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BLR

11-25-2003 11:46:43




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 Re: Case-O-Matic, Anyone have time to explain in reply to David811B, 11-25-2003 10:43:56  
In a Case-O-Matic (COM) equiped tractor the traditional clutch disk and pressure plate has been replaced with a torque converter and hydraulically activated clutch pack. This is basically the same as the automatic tranny in your car except that the COM system is connected to a standard gear driven transmission. The biggest misconception in the operation of a COM is you can "slip" the clutch with the foot pedal. This is impossible since the foot pedal is connected to a hydraulic valve that controls the oil pressure in the converter, and is either on or off. When you rev up the engine and let out the clutch in a COM equiped tractor it is the equivalent of doing a neutral drop in your car. The proper way to change gears is to slow the engine as far as possible, make the gear change and add throttle to get the speed you want. On occasion you may want to apply breaks to slow your speed, but keep the rpm up, this lets the converter do the slipping for you. When you're under a constant load and plan to stay at a set speed(ie pulling a disc or something) use the lever on the left side of the dash to engage the direct drive clutch(DDC), which in effect locks the converter to the flywheel, and eliminates the slipage of the converter. This improves engine economy and speed a bit. When the pulling gets a little tough or you getting wheel slippage you can switch back to COM to work through the tough spots. What you don't want to do with the DDC is add a bunch of throttle and from essentially a dead stop engage the DDC. This will result in a severe jerk, and ultimate destruction of something. Hope this helps.

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Neal

11-25-2003 11:57:58




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 Re: Re: Case-O-Matic, Anyone have time to explain in reply to BLR, 11-25-2003 11:46:43  
I have a Case 801B with COM that I just bought this past summer. It is the first COM that I have owned. I understand the function of the COM. But are they supposed to be hard to shift from gear to gear? I cannot seem to keep from grinding the gears.



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SHeiserman

11-26-2003 04:22:20




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 Re: Re: Re: Case-O-Matic, Anyone have time to expl in reply to Neal, 11-25-2003 11:57:58  
That is alot of the problem I had with mine. If you count to 3 after you push the "clutch" in, at idle, it will go right in gear. If you are in a big hurry and don't have time to go all the way to 3, count to 2. There needs to be a delay in shifting after you push the clutch in.



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BLR

11-25-2003 22:59:53




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 Re: Re: Re: Case-O-Matic, Anyone have time to expl in reply to Neal, 11-25-2003 11:57:58  
The COM tractors can be a bear to shift sometimes. The first and most important part is make sure the oil is clean and correct and the filters in the COM system are also clean. If you haven't already, I would suggest getting an IT shop manual, as it has a good section on the COM. As Gene said, slow the engine as much as practical before making the gear changes. In addtion, a short warm up may help as it should get better as the tractor warms up.

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Gene Dotson

11-25-2003 13:03:43




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 Re: Re: Re: Case-O-Matic, Anyone have time to expl in reply to Neal, 11-25-2003 11:57:58  
Neal; This goes back to what BLR just posted about always idling the engine down before shifting gears. With the engine slow, you will have less fluid motion in the converter that keeps things in motion even with the clutch disengaged.When shifting, disengage the clutch until the tractor completely stops, then shift. BTW, it is not called a clutch pedal, it is an inching pedal... Gene



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Slowpoke

11-27-2003 23:45:10




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 Re: Re: Re: Re: Case-O-Matic, Anyone have time to in reply to Gene Dotson, 11-25-2003 13:03:43  
Would it be a good idea/bad idea to design something that would automaticly drop the engine to idle when the inching pedal is pushed down? Then as the pedal starts back out, the rpm comes back to the throttle setting. And since as a post above says, the "clutch" pedal controls an on/off valve, how can there be any "inching"??



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tom thompson

11-25-2003 18:03:57




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 Re: Re: Re: Re: Case-O-Matic, Anyone have time to in reply to Gene Dotson, 11-25-2003 13:03:43  
more questions on case o matic i have a case 420industrial torque converter drive and a trans line wore through i repaired it and ever since it doesnt seem like it will disengage properly going between forward and reverse on shuttle shift plus alot of slippage when moving wonder about bleed out procedure? thanks



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