Classic Machines: The Allis-Chalmers HD-19 revisited Classic Machines

Classic Machines: The Allis-Chalmers HD-19 revisited

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...
Evolution of the Single Axle Scraper Classic Machines

Evolution of the Single Axle Scraper

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...
Classic machines: The scrapers of Curtiss-Wright Classic Machines

Classic machines: The scrapers of Curtiss-Wright

A company far better known for its aircraft such as the legendary Jenny, Kittyhawk, Tomahawk and Helldiver, plus a very successful line of aircraft engines, Curtiss-Wright also briefly had an earthmoving division. By RICHARD CAMPBELL. Curtiss-Wright entered the earthmoving business through the acquisition of the Wooldridge Corporation,...
Classic Machines: Caterpillar's D7 tractor -'the early years' Classic Machines

Classic Machines: Caterpillar's D7 tractor -'the early years'

The iconic Caterpillar D7 has been in continuous production in various versions since 1935. They have fought in three major conflicts – WWII, Korea & Vietnam - and are a strong testament to a product that really was “built for it” By RICHARD CAMPBELL The D7 owes it’s origins to the Caterpillar Diesel Fifty which was...
Forgotten companies: Bucyrus-Erie Classic Machines

Forgotten companies: Bucyrus-Erie

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,...
A more modern look at the Allis-Chalmers TS-200 motorscraper Classic Machines

A more modern look at the Allis-Chalmers TS-200 motorscraper

Although it was not an original Allis-Chalmers design, the model TS-200 motorscraper paved the way for a far more successful machine in Allis’ product line, the TS-260. By RICHARD CAMPBELL. We first took a look at the Allis-Chalmers TS-200 way back in 2003, and for the benefit of our newer subscribers and those who may have missed the...
Classic Machines: the LeTourneau Tournacranes Classic Machines

Classic Machines: the LeTourneau Tournacranes

While a great many of LeTourneau’s inventions were designed for earthmoving purposes, some of his creations had very practical applications elsewhere. By RICHARD CAMPBELL There is a very old saying “necessity is the mother of invention”. This is particularly relevant when describing the development of the Le Tourneau...
Classic machines: The Euclid S-12 scraper revisited Classic Machines

Classic machines: The Euclid S-12 scraper revisited

Intended as a larger version of the Euclid S-7 which had proved to be extremely popular, the Euclid S-12 never really fulfilled its obvious potential. By RICHARD CAMPBELL Back in the February 2006 issue of Contractor, we had a look at the Euclid S-12. The original article was quite short due to allocated space limitations and in the...
Classic machines: Caterpillar's No.12 motor grader Classic Machines

Classic machines: Caterpillar's No.12 motor grader

What makes a classic motor grader? Looks, ability, ease of operation and longevity are all pertinent factors as are resale value if you’re looking to buy another. Whatever the criteria, Caterpillar’s No.12 Motor Grader had them all. By RICHARD CAMPBELL Of the thousands of motor graders manufactured by Caterpillar since their...
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