Case-O-Matic

[Ji Case 35172]

What do you guys think of Case-O-Matic transmissions?

 

[casecollectorsc]

Great transmission if you understand the principle behind them. 1/2 dozen here at least, I don't think any have ever been apart in 50+ years since new.

 

[ss55]

People either love them or hate them, there are plenty in both camps.

In Case-O-Matic mode the torque converter acts like a shift-on-the-go with an increasing amount of energy converted to heat as the converter slip increases. The torque converter always drags a little, so the gears always grind when shifting, but they grind much less if the engine is idled all the way down for a few seconds before shifting.

 

[Ron Sa]

See my post below under Case-O-Matic 830. I could have given the COM credit for being durable and more idiot proof than the Farmall TA. The TA could be abused because dry clutches can be abused--by idiots. Unlike the COM, the TA has a dry clutch, within the mechanism, that has to absorb the up-shift energy. "Rapid cycling" of the TA lever under heavy load can burn the TA's dry clutch.

 

[Ande]

One fine transmission. You take care of it, it will take care of you.

 

[X-Y switch]

(quoted from post at 15:36:34 07/19/17) People either love them or hate them, there are plenty in both camps.

In Case-O-Matic mode the torque converter acts like a shift-on-the-go with an increasing amount of energy converted to heat as the converter slip increases. The torque converter always drags a little, so the gears always grind when shifting, but they grind much less if the engine is idled all the way down for a few seconds before shifting.

both hated and loved my old 611B, loved it for drawbar work, and hated it for PTO work if there was a lot of stopping and starting. I would start it in gear(carefully) to eliminate the gear grinding.

 

[Eagle Doc]

I have a 830 EH with COM that if I bring it to a complete stop before shifting there is no gear grinding at all.

 

[Ron Sa]

My 800COM also did NOT grind gears when the oil was hot and after a complete stop shift quickly from one gear to another.

But after the tractor had set overnight and was completely cooled down when the oil was a little stiff, then after starting the cold tractor and even at low idle, shifting from NEUTRAL into any gear caused a lot of gear grinding.

 

[Bret4207]

I like the COM. It's not actually the transmission, it's a locking torque converter ahead of the tranny. Good system IMO.

 

[J-J]

They are very good if you know how to use them. I also really like them because everyone is scared of them making the purchase price cheaper. We have 5-830, 3-800, 1-600,2-400, and 2 round nose 400 with com. Only problems with the b series and a couple of relief valves on the bigger ones.