Allis-Chalmers led the charge for a bigger, higher horsepower track type tractor following World War Two. The resulting model HD-19 was a breakthrough in many ways and was the foundation on which the later, highly successful model HD-21 was based. By RICHARD CAMPBELL
We first took a look at the Allis-Chalmers HD-19 back in...
Grand-daddy of all the scrapers (apart from the horse-drawn, wheel-less Fresno type), the single axle scraper has a niche in the history of earthmoving and this type of scraper has seen a resurgence within the last decade. By RICHARD CAMPBELL
Developed from the early drag scrapers and designed as a utility land leveling tool, the single...
The Bucyrus-Erie Company was world famous for it’s range of face shovels, draglines, cranes and other mining and quarry equipment. However, it also made a wide range of tractor equipment that was popular through the 1930s to the middle 1950s which is now largely forgotten. By RICHARD CAMPBELL.
The Bucyrus Foundry Company of Bucyrus,...
The late 1940s and early 1950s saw unprecedented growth in earthmoving projects worldwide with demand for new machinery at an all-time high. Some manufacturers were well prepared while others had to improvise as best they could. By RICHARD CAMPBELL.
International-Harvester was a large manufacturer of track type tractors with a good...
Back in time when the track type tractor was still considered a new tool for earthmoving, there were dozens of companies offering attachments to outfit these machines for work. Isaacson were one of them. By RICHARD CAMPBELL.
With the end of the great depression in the early 1930s, those tractor manufacturers who had survived the...
Born of necessity, the Caterpillar DW21, the great granddaddy of all Caterpillar 2-axle scrapers, went on to become a very successful scraper for Cat and also laid the groundwork for the later two-axle 600 series machines. By RICHARD CAMPBELL.
We originally had a look at the Caterpillar DW21 back in May 2004. As with some of those...
As soon as material constraints were removed prior to the end of WW2 the major earthmoving machinery companies set about designing new equipment to cater for the expected post war machinery boom and International Harvester was no exception.
International had achieved a measure of success with their first large track type tractor, the...
Before the motor scraper there was the towed scraper – one of the first types of bulk earthmoving equipment to be invented. RICHARD CAMPBELL looks back.
Early ‘Fresno’ type towed scrapers (named after the area in the US where the type originated) were nothing more than simple pans pulled by mules, oxen or horses and dumped by...
Ten years ago, when I first wrote about the International 270 PayScraper (Contractor, September 2005), the article was heavily abridged to fit available publishing space. Also, the photos used at the time weren’t all that good so it is high time to revisit this machine, and give it the treatment it deserves! By Richard...
The Diesel Sixty marked a significant milestone in the development history of the track type tractor in that it was the first such diesel engined machine to be put into full production by any heavy equipment company, and was the forerunner of tens of thousands of Caterpillar diesel tractors.
The Diesel Sixty was not Caterpillar's...
