Euclid TC-12 Dual-Engine Crawler-Tractor at WMSTR in Rollag, MN 2016

[@SavageVoyageur]

I remember working on these crawlers. Twice the power but they also were twice the breakdowns. Two engines, two transmissions, two radiators, two hydraulic systems. They are pretty simple to wok on. I’ve rebuilt lots of these 6-71s and Allison’s over the years. Glad to see these are still plugging along.

[@pinkhead6857890]

Didnt GM make less than 1000 of these things worldwide throughout the Euclid TC-12/Terex 82-80's entire production run? Where in the world did you get to work on not one but several of these unicorns? Also, how the hell are you supposed to synch two engines to run at the exact same speed under load & rough terrain when you need the machine to move forward in a perfectly straight line? Theres gotta be more to it than just joining up the throttle linkage, right? These things had to have had a means of synching track speed, otherwise it would be a pretty useless dozer. Steering clutches on a dozer suck more than anything has ever sucked before, but how else are you supposed to get a perfect 50/50 power distribution between both tracks. One engine is always going to be under more or less load than the other, so it should be impossible to keep both tracks at equal speed with two independently driven sprockets, right? I get that the governors will do their best to keep each engine at constant rpm under load, and im sure the Detroit's high redline greatly minimizes any fluctions affect on track speed, but your still effectively running with an open diff with this dual drivetrain setup, right? Whats stopping it from pulling/grading drunken lines like a tractor thats pulling a sub-soil plow with an open diff? IDK, maybe all that is why so few of these things were built and the D-9 instead became the F-150 of big-earthmoving equipment. Independent drive and bulldozer are two mutually exclusive terms that sound to me like glorified skid-steer when put together.

[@SavageVoyageur]

@@pinkhead6857890 As a Euclid/Terex Distributor in Minnesota we saw lots of oddball units. Euclid gave our distributorship the very first front end loader they made, S/N 0001. We had to agree not to sell it. To clarify I said I worked on a lot of Detroits and Allison’s in my time, 42 years as a mechanic. As to this exact model I have no idea how many, probably 2-3. Maybe I worked on the same unit 2-3 times, no idea. This video was from Rollag MN only about 100 miles from where I worked. It very might have been the SAME unit I worked on, or a cousin to this one. As I said it was a bitch to get both engines to put out the same Horsepower. You had to get the linkage exact, you had to have all the injectors working exact, you had to have the engine and transmission working perfectly. But you need to remember that the transmission in these did NOT have a lockup clutch, but they did have a converter. So if one engine was not up to par the transmission would understand that it was not getting enough power. So you would need to adjust the lever that made that side forward or back depending on which one was off. So this is how they got away with two power systems for each track. If off enough you would just adjust the control levers so they would be together. You think that’s weird, did you ever work on and Terex TS-24? They had a Detroit V-12 in the front and a V-6 in back. Both with totally different transactions too!

[@richardortiz8704]

Slower than a turtle but it's alright

[@mattberg916]

Great story from the owner's wife. From a time when you made it work!

[@craigcampbell5129]

That is one hell of a blade on the front of that machine

[@dozer1642]

There’s a reason you don’t see new tractors with this design. It sure is a beast though.

[@marciano8187]

Belíssimo...trator... excelente !!! 👍👍👍👍👏👏👏👏👏👏

[@gazof-the-north1980]

These beasts were 40 tons and over 400hp!

[@RJ1999x]

Allis Chalmers HD21 "hold my beer"

[@JorgeRodriguez-po7kx]

From What Year is it BTW ?

[@MrBoiler09]

wow!!!!!!! what a machine!!!!!!!!!!!!!!!!!!!!!!!!!!

[@MarylandConstructionDiecast]

Awesome!

[@tomyousch7070]

Screaming Detroit diesels kept you awake

[@edilsonmartins6653]

Super máquina!

[@garethifan1034]

Euclid TC12, IH TD25, Ac.HD 41, Cat D9 - The US seemed to make a lot of big crawlers at one time. I wonder which was the best all rounder out of these?

[@catskinner7564]

Gareth Ifan d9g 66a was the best 41 was a really hard to work on it was a bigger machine International TD 25 fast it broke down more also for the 41b they had a deal on it where you had to run Full Throttle you couldn't sneak into something cuz they had brake release when you rev it it at Full Throttle I know nothing about the tc12 the only thing I know it was very loud I have ran all of them but the 12

[@garethifan1034]

@@catskinner7564 Thanks for the reply Adam..that's interesting what you know

[@kflo409]

D9 is a superior machine. I've run both a TC12 and D9, while the 12 is just a cool machine a D9 is far simpler to work on and can move almost as much dirt if not more

[@wilmamcdermott3065]

You for got the most popular allis the HD31 a way more of those built than HD41s

[@wilmamcdermott3065]

I have ran both D9 and ac HD 31s

[@ParanormalvBlogger]

Nice And Big Bulldozer!

[@wilmamcdermott3065]

What is the rated horses of that machine

[@buelowexcavating]

One non turbo 6 - 71 Detroit Diesel engine can put out 238 horsepower.

[@waitemc]

Shes a beaut

[@mikegriff8372]

What does that weigh?

[@robertatwood2503]

Mike Griff sure you will find that answer in the description contractormag.co.nz/classic-machines/euclid-tc-12/

[@mikegriff8372]

Thanks, 52 tons at 440HP.

[@electricitysucks5]

That thing is AWESOME!

[@benniebarrow348]

Cool to look at but had to be a maintenance nightmare not mention it seems to be excessively loud and slow .

[@motorhead6763]

coolest dozer ever made

[@johnsomerset1510]

Great machine but the tracks look a bit smooth to get any real grip.

[@jonwill1801]

Matches a CAT D10? But this dozer is a whole lot cooler, a whole lot more interesting.

[@rossgray3070]

Was never a D 10 in size TC 12 was only 425 hp, D 10 was 700hp when first introduced.

[@dougwood6186]

This is a 40 tonne machine and original D10 was 85 tonne

[@gunplow]

That sound all day long ouch

[@mkgrable01]

Icharles

[@discowest2557]

Frustrating to watch