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  • NEW Classic Machines: Euclid's Big Singles(The S-28 & S-32)

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    Euclid's Big Singles by Richard Campbell

    During the 1960s, there was a surge of interest in really big single engined motor scrapers.

    Projects had gotten much larger and the need to shift bulk earth at a reasonable cost was of great importance to earthmoving contractors.

    Caterpillar had gained a bit of a jump on the competition with their model 651 which was first introduced in 1962.

    Not to be outdone, Allis-Chalmers, M.R.S, Clark-Michigan, Wabco and Euclid all developed really large single engined scrapers to do the job and take Caterpillar on.

    Of these five manufacturers, only Wabco, and to a lesser extent Allis-Chalmers, had any real success in this size category.

    Euclid had seen the need for a machine larger than their existing S-24 in 1962 (after Caterpillar had already introduced their 651) and immediately began development of a couple of test “mules” to see how well they performed.

    After a few tweaks, the first production machines, now known as the Euclid S-28, made their appearance in late 1963.

    The Euclid S-28, as the designation implies, held 28 cubic yards stuck and 38 cubic yards heaped, a very worthwhile payload.

    In operational trim, the machine weighed almost 46 tons empty.

    It was powered by a General Motors 12V-71N V-12 diesel rated at 441 flywheel horsepower and had an Allison CLT5960 six-speed powershift transmission which allowed it to move along at around 30 mph.

    The S-28 also introduced a few firsts for Euclid, some of which would be incorporated into other machines in the range.

    First of these was a power down apron.

    Up until 1963, all Euclid scrapers featured a cable operated, gravity closed apron.

    (Some machines, such as the TS-14 still retained this feature up until it was discontinued).

    Due to the new configuration of the S-28’s gooseneck, application of a gravity closed apron was not feasible so another solution had to be found.

    The result was the power down ‘radial arc’ apron.

    By 1964, both the smaller S-24 and TS-24 also featured a power down apron.

    (So did the TS-18 which came out in 1972).

    Next innovation was the roller push block.

    If you have observed for any time push loading of scrapers, you may have noticed that it is possible to lift the rear wheels of the scraper off the ground when loading.

    This results in a loss of control over cutting depth for the scraper operator.

    Euclid’s roller push block was an attempt to negate this problem, and it worked to a greater extent.

    The fact that it did work resulted in the roller push block being made available as an option for all other Euclid scrapers.

    The last trick up Euclid’s sleeve was the single lever bowl operation control.

    This was a concept ahead of it’s time and only really recently reintroduced on more modern scrapers.

    One lever controlled all functions – bowl lift/lower, apron lift/lower and ejection.

    In order to get this rather complex device to work, Euclid engineers employed air boosted servos to the hydraulic valves.

    This proved to be somewhat problematic as operators complained that they lost “feel” for the bowl functions.

    Previous Euclid scrapers used a direct linkage to the valves allowing minute adjustment by the operator.

    The air booster just opened or closed the valves immediately which made for quite jerky operation.

    Also, unless the air system was regularly – i.e Daily – purged of water, moisture in the air lines quickly corroded the polished surfaces of the valves causing them to stick, with the usual unfortunate consequences.

    Euclid offered a multi-lever reversion package to overcome this problem but still offered the single lever control up until the late 1960s and well into the production of the S-28’s successor, the S-32.

    Another break from Euclid tradition was the application of a two-piece bowl floor, part of Euclid’s “roll out, snap out” ejection system.

    All Euclid scrapers of the 1960s had a curved bowl floor hinged just behind the cutting edge.

    Application of a roller lever or direct hydraulic force lifted the floor up and forwards rolling out the load.

    Euclid deemed that due to the length of the S-28’s bowl floor, this was not a practical way of getting the load out and so they came up with the two-piece floor.

    Instead of having just one hinge behind the cutting edge, it also had another about half way along.

    When the hydraulically actuated roller lever lifted the bowl floor to eject the load, the floor rose and contacted rollers on either side of the bowl top bending the floor in half near the end of the stroke allowing the last of the bowls contents to be “snapped” out.

    Great idea when new but repeated banging of the bowl floor against the stops eventually resulted in structural failure.

    In fact, structural failures would plague both the S-28, S-32 and the twin powered TS-32 all their operational lives.


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