i will add. like Jon says the torque converter is exactly like a car. it will slip just like a car. so a COMatic tractor can be idled down and depending on the gear, it will simply sit there like a car at a stop light. they do have a set of clutches (disc pack) between the torque converter and the transmission (regular 4x2 8 speed) so when you disengage the clutch pedal it cuts power to the transmission and stops the tractor so you can shift. this is all hydraulically actuated.
when starting out say with a plow in the ground you go in COMatic (torque converter mode) and once going and up to speed you engage the direct drive lever which locks the torque convert out so there is no converter slippage (like modern cars from the last 30 years do it electronically) then if you come to a tough spot you just bump it back to CaseOMatic mode and get thru it. CaseOMatics have a pressure gage so you know if the COMatic pressure is right and a temp gage so you know if the COMatic fluid is too hot (if you're doing too much in torque converter mode they will get hot, like a car). they will have a set of oil lines go up to and back from the radiator like an automatic car as well.
you will see some change in speed with the direct drive engaged. handy hay tractors as you find the right gear and bale in direct drive then if you have a heavy spot or big clump you can go to COMatic mode and ease thru it. pretty handy.
a couple things to watch. check the fluid (big dipstick on left side) for level and burnt oil and some ?? are known to have the clutch pack discs behind the torque converter warp some making it hard to shift (gears keep spinning some). like anything else they can be abused as well.
generally good transmissions and kinda neat. i liked the one we had and i could pull small trees out with no trouble. find a low gear and add some gas and let the torque pull it out (Be careful) i've heard that a diesel caseOmatic is a good set up for tractor pulling too.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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