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BrianRBM

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What is this truck used for? Thanks. How would you like to change a tire on this one....
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I see a trailer hitch, so apparently pulls some humongous trailer for dirt or rock at a construction site. Apparently too heavy to run on concrete road, so must stay on the site and just get moved from job to job by truck. But sure wonder how they get it anywhere, because those two lo-boys are far enough apart that they would wipe out mailboxes on both sides of any conventional road.
 
I wonder what they get for gas mileage. If they stay on the back of those trailers its probably pretty good.
 
I think that would be possible for short trips by putting one truck in neutral and driving slowly (one truck might be able to power it all (?)). But at the same time I don't see any escorts or wide load signs. Could this be a doctored picture?
 
Watched a news story about hauls like this when they moved the tunnel boring machine to MSP airport. Said they chained the equip to both trailers, then one driver was master and the other took direction. Experienced teams could reach speeds of 60 mph depending on the load. Very talented drivers.
 
The Company doing the move is Kirscher Transport out of Virginia, MN. They haul a lot of oversized loads to support the Iron Mines in Northeastern MN. In the pics they are moving a Mining Production Truck from one mine to another. They box itself is a separate load. They have more pics on their website.
 
I believe it's a Komatsu. Definately not a Cat 797, there are power electronics up on the deck next to the cab for an electric drive system. Cat is mechanical drive through a 7 speed powershift trans.

Those trucks at rated power (797F with C175-20) burn at a rate of about 12.5 L/min (3.3 gal/min). Typical duty cycle is about 35-40% and average about 20 hours per day, 7 days a week.
 
I have drove them, an worked on them, also changed tires to.The are used around here to haul overburden and coal,also run a hydraulic shovel loading them.For several years.
 
Used them in a copper mine in AZ. Even got to drive one. Hauled 320 tons in the bed. I also got to operate the shovel that loaded 60+ tons at a time.
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