When it became obvious that its rock product operations was not as cost effective as it could be because of transportation and hauling costs, Keller Crushing & Screening Inc. of Tunkhannock, Pa., purchased an E-7 fully-tracked screen from Extec Screens & Crushers Ltd.
John Keller founded the company in 1958 for the purpose of screening sand and gravel. In 1996, the management decided to strengthen its core business activities and leased a quarry. At the quarry, rock was blasted and hauled to a stationary crushing and screening plant, which proved to be a costly and inflexible operation.
To make improvements to the quarry production, Keller turned to Commonwealth Equipment Corporation, a dealer with a reputation for helping quarrying operations.
Keller worked closely with Mark Davies of Commonwealth Equipment to find the equipment that would meet the needs of the quarry operations.
The Extec E-7 screener’s ability to produce three sorted sized products capable of going directly to the rip rap material would provide the savings on transport and haulage that Keller wanted.
Another feature that was of particular interest was the E-7’s hydraulic powered adjustment system for inclining the screen from 10 to 22 degrees. By reducing the screen’s incline wet materials can be efficiently screened in one pass. When the materials to be screened are dry, the screen incline can be elevated, increasing the throughput rate.
Today, the company produces crushed rock for subbase for the construction of local roads and highway. The E-7 screener processes 250,000 tons (227 t) of rock products of which 60,000 tons (54,000 t) is rip rap.