Home town case history

jon f mn

Well-known Member
This unit is for sale not far from my house. These were made in Braham, the town I grew up in. They were considered top of the line in their day.


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These are tied even closer to me as the company came out to the farm to take measurements from dad's tractor and even took his tractor in to the factory to make the mounts for the unit. Up til then they had put these on jd a d ih tractors but they had customers that wanted the case with com. I know of several of these around, one at WMSTR in Rollag MN.

Later the made at least one with a 770 case and used dad's 870 for a pattern, but I've never seen one of those in person. By then they had gone to mostly pull type. I remember the lines of the ull type units sitting along the hyway waiting to be ent out, but don't remember any self propelled ones, altho my brothers remember those.
Sale link
 
Was available in the small frames the 400/600B, 530/630. I. The large frame tractors the 800 and 730/830 .
 
Dahlman also developed a roller cleaning system for potato harvesters and licenced it to a number of manufactures over here. They were the best thing since sliced bread and nearly every European manufacturer used them at some time or other. I was involved with potato harvesters in the 1980's and 90's.
 

It took me a three minutes to puzzle out what com is - Case-o-matic, right? Was that a three speed powershift?

It is very interesting that they used an entire tractor instead of building their own powertrain. That was very clever and probably saved quite a bit in R&D
 
COM is a torque converter drive just like
in a car or pickup. When locked it pulls
just like a dry clutch, but when in com it
slips like any torque converter drive. So
there is no actual shift or speed change,
just the slippage you get from the
converter. They worked very well for
tillage as it was almost impossible to
power out as they just continued to slow
til you pulled through. Also worked good
for things like silage chopping as the
torque converter kept the engine perfectly
in the power band even with varying crops.
Made the tractor do the work of one size
larger tractor. I would think they would be
almost perfect for this type operation as
the speed could vary a lot with little
change in pto speed.
 
That is interesting. Too rocky and clay and wet down here for commercial potato growing. Lot of beets 30+ miles nw of me but the dirt gets more loam and better drainage there. Anyhow we dont see much specialty equipment local.

Looks like a whole lot of weight on not a lot of tire there, those things would just about sink away in our squishy clay!

Neat.

Paul
 

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