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Historical Construction Equipment Association
Home of the National Construction Equipment Museum


M. R. S. through Michigan

15 photo(s) Updated on: 03/08/2024
  • Circa 1950 M. R. S. 150 AGT wheel tractor. MRS tractors were developed in the 1940s to pull large scrapers and bottom dump wagons. The large fenders can be filled with ballast for greater traction.
  • When delivered to the Museum in October, 2013, this 1976 Mack DM68SSX tandem axle dump truck was our youngest machine.
  • Along with its famous over-the-road trucks, Mack also offered off-highway haulers like this early 1960s 30 ton capacity M30X with a Heil body. (Joe Nowak photo)
  • "Before" image of our 1942 Manitowoc 3500 crawler crane. It represents the first use of a torque converter in an excavator. The 3500 was also the basis for the very successful 3900.
  • The fully restored 3500 at work as a dragline. The restoration even included new window glass!
  • 1926 Marion Steam Shovel Company Model 21 electric shovel, the smallest shovel to be powered entirely by electricity. The power cable is on the ground behind it.
  • The 21's machinery deck during restoration by Museum volunteers. The motor/generator at the rear (right) converts AC power from an outside supply to DC for the shovel's motors.
  • The 21's operator has plenty of air conditioning, but notice the lack of a seat - seats were optional on many construction machines into the 1920s. (John Sams image)
  • A very old and fully restored Marlow diaphragm pump. The engine powers a walking beam that lifts and lowers pistons to draw water through a hose connected to the intake at far left.
  • 1933 McCormick-Deering TA40 crawler tractor. The crawlers and undercarriage are all original; for its entire working life, it powered a sawmill from the rear power take-off. (Gary Munsey photo)
  • 1950 Michigan Power Shovel C16 shovel.
  • 1934 Michigan Power Shovel T6D truck crane. Michigan was the first crane manufacturer to design its own carriers for truck cranes. Lifting capacity was 6 tons.
  • 1953 Clark Michigan 75A wheel loader. This was the first production unit of what was, at the time, the world’s most advanced rubber-tired loader line.
  • c. 1963 Clark Michigan 175A Series I wheel loader. This machine is the Museum's garden tractor, snowplow and general workhorse. Bucket capacity is 2.25 cubic yards.
  • Many early loaders had a major design issue. The operator had to climb over the bucket arms to get it or out, and they could cause major injury to a hand or arm in their way as they moved up and down.
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