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Historical Construction Equipment Association
Home of the National Construction Equipment Museum



30 photo(s) Updated on: 03/15/2024
  • Introduced by C. L. Best in 1921, nearly 25,000 Cat Thirty tractors were built through 1932.
  • The Cat 2-Ton was introduced by Holt to replace its T-35 in 1924, the year before Holt and C. L. Best merged to form Caterpillar Tractor. This example dates to 1926. It weighs just over 4,000 lbs.
  • Caterpillar's early crawler tractors had gas or diesel engines. This 1935 Diesel Fifty, meaning 50 horsepower, predates the D7 that is still produced today.
  • This 1956 Cat D2 is equipped with a Cat straight dozer. It's rated at 38 horsepower, and 50" track gauge; the 4U series' tracks are 40 inches apart.
  • This 1940 Cat D4 crawler tractor sports a LaPlant-Choate hydraulic dozer.
  • This 1959 Cat D6 is one of the last 9U series built. The dozer could be raised or lowered by hydraulic cylinders, as shown here, or by cables from a winch on the front or back.
  • 1951 Cat D7 crawler tractor. The narrow, inside-mount dozer was specified by the U. S. Army to save space in shipping. It is also designed to push scrapers more efficiently during loading.
  • The Museum's Cat D7F was built for the United States Armed Forces circa 1972.
  • HCEA member Gary Mahan purchased this 1965 Cat D9G, restored it and delivered it to the Museum! The narrow, inside-mount dozer pushed scrapers without picking up material outside the path of travel.
  • Caterpillar No. 33 Standard Frame pull grader.
  • This Cat No. 44 pull grader is a future restoration project. It was built between the mid 1930s and 1941, when Cat discontinued all of its pull graders.
  • This 1940 No. 12 grader is one of three machines in the Museum collection still being built today, albeit in much more modern form. Tens of thousands of No. 12s have been built worldwide.
  • 1964 Cat No. 12E motor grader with scarifier. The pole next to the seat is for an umbrella.
  • Designed to be pulled by a D7 tractor, the 435 was the smallest pull scraper built by Caterpillar in its later line of these machines.
  • 1949 Cat DW10 tractor and 1950 No. 10 scraper. This outfit once belonged to late Museum volunteer Jack Campbell.
  • 1959 Cat DW20F tractor with No. 20 scraper. This tractor was equipped with a second seat by the donor, the Ohio Operating Engineers Apprenticeship Fund, for use in equipment operator training.
  • Caterpillar's 621 series of model scrapers was rated at 14 cubic yards struck across the top of the bowl, 20 heaped.
  • The Museum's two 1960s Cat 631-B motor scrapers. Maximum capacity is 30 cubic yards. Note the open rollover protection structure on one versus the enclosed cab on the other.
  • The Cat D9G, 621B and 631Bs are major attractions at Museum shows as they participate in reenactments of 1960s earthmoving.
  • 1979 Cat 613B elevating scraper. Where a conventional scraper loads by forcing a cutting edge through the ground, an elevating scraper sweeps material into the bowl .
  • 1948 Cat D2 with Trackson T2 Traxcavator. Derived from a design that originated in the late 1920s, the bucket is raised and lowered by a winch above the engine. This design was discontinued in 1953.
  • 1947 Cat D4 with Trackson T4 Traxcavator.
  • 1953 Cat HT4 crawler loader. Designed by Trackson and built on a modified Cat D4, the HT4 was the first all-hydraulic crawler loader offered by Cat. Bucket capacity is 1.25 cubic yards.
  • 1963 Cat 944 wheel loader. Hydraulic cylinders under the boom (visible above the front tire) push and pull the top of the bucket by means of the linkages along the boom. (Ron Wozniak photo)
  • On a World War II surplus trailer for portability, this 1951 Cat D13000 diesel generator set provides electricity for the Museum's 1926 Marion Type 21 electric shovel.
  • Sidebooms were originally designed for laying pipe into trenches, and since the 1960s have also found work in clearing railroad wrecks. This one is on a rare 1939 Cat R4 gas-powered tractor.
  • Our 1958 Cat D6 waits for its MD6 sideboom to be installed. The MD sidebooms were developed by Trackson as attachments for Cat tractors, and Cat acquired Trackson in 1951.
  • This very rare Cat 572C was purpose-built as a sideboom tractor, rather than mounting an attachment on a conventional tractor. The oblong counterweight swings down and out as the load is lifted.
  • Cat's wheel tractors, like this 1948 DW10, could be used to pull scrapers or wagons. This bottom dump wagon has been converted to a water sprinkler fur dust control.
  • Another Gary Mahan restoration and donation, this 1960s Cat 631B tractor pulls a Klein tank. The tank holds an estimated 8,000 gallons of water and sprays it out to control dust and aid compaction.
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