The McCloskey 412 RT (equipped with radial stacker, and tracks) is a track-mounted trommel fully equipped with a 4- by 12-ft. (1.2- by 3.6-m) screening drum, radial stacker and optional tipping grid, all packed into a compact unit that transports under 32 ft. (9.7 m) overall length.
The design of the new tracked 412 trommel is based on its wheeled counterpart, which was unveiled by McCloskey last year.
The wheeled 412 R, which was designed to travel on a pintle hook and a single-axle undercarriage, was introduced to bridge the capacity gap between McCloskey’s 407 and 512 model. That machine was the first to use new fabrication techniques, developed by McCloskey engineering, which makes extensive use of folded steel plates in the chassis, in place of traditionally welded plates. Using folded plates gives the design engineers greater strength and more flexibility for their internal configuration of the trommel, according to the manufacturer.
While the wheeled unit represented an important breakthrough in manufacturing expertise, the additional hydraulics required for the crawler tracks of the 412 RT presented a significantly greater engineering challenge.
“Nothing has been left out to fit the smallest possible transport envelope for this unit. It’s smaller than any comparable machine, but it’s built for strength. Thanks to the drum remaining the same size, and the hopper actually increasing in size, production remains the same as older, larger machines,” said Paschal McCloskey, president and founder of McCloskey International.
Big Things in Small Packages
The 412 RT is now the smallest trommel available with an optional tipping grid, or reject grid, for screening heavy-duty materials. The tipping grid adds another dimension of versatility to the machine’s highly portable design. Its low loading height, large hopper and long track make the tracked 412 trommel an ideal machine for housing contractors and custom screeners.
The trommel is small enough to tow behind a dump truck and low enough to travel on a regular step-deck, allowing the screen to be transported straight to excavated material on the construction site. There’s no need to truck the material off to a distant screening site.
The crawler base and four jack legs give it a stable working platform on almost any site. Operators are able to feed the 412 with their most available equipment, including backhoes and skid steers, as well as standard 3-yard wheel loaders.
When dealing with C&D waste, or material with a high rock content, the optional tipping grid protects the trommel, scalping off material larger than 6 in. (15 cm). This allows contractors more freedom to tackle heavy-duty jobs with smaller machines, according to the manufacturer.
McCloskey said that the new 412 also will offer an excellent fit in the rental operations of the company’s nationwide dealer network. This model features the original Drum X-Change System, allowing customers to change screen size in a matter of minutes. Its drum screens, along with other components, are interchangeable with parts inventories already available from McCloskey distributors.
The 412 RT trommel is powered by an 80 hp (59.6 kW) Caterpillar 3054C engine, a power unit normally reserved for trommels in a larger class.
Tier III engines for these models will be available to meet regulations coming into effect in 2008.
For more information, call 877/876-6635 or visit www.mccloskeyinternational.com.
This story also appears on Aggregate Equipment Guide.
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