Beltsville, Maryland-based Sun Services LLC cites preventive maintenance (PM) as a key to keeping its fleet of three Sennebogen material handlers ready to take on an average of 70 tons or more of per hour of construction and demolition materials. The company uses the Sennebogen machines to help receive, process and ship its C&D materials.
According to Stanley, North Carolina-based Sennebogen LLC, when the Sun Services site was first designed, it was targeted for a capacity of 400 tons per day. To meet customer demand, Brian Shipp, one of the founders, streamlined the firm’s receiving bays and upgraded its material handling machines to double that volume.
Says Shipp, “Everything that comes in here has to go out the same day. We only have 250 cubic yards of metal storage onsite and two bunkers for concrete.” Operating a large truck and container fleet, including rolloffs and large walking floor trailers, the compact facility is now taking on peak traffic of up to 60 trucks in one hour. Sun Services’ shredder line goes nearly non-stop.
Sun started out with a conventional fleet of wheel loaders and excavators, but those machines could not keep up with the growing demand, according to the firm. In early 2019, Shipp acquired his first purpose-built Sennebogen 818 waste handler from Pennsylvania-based dealer Midlantic Machinery. After seeing it perform, Sun added two more 818s later that year. But only two of the new machines are operating at any given time, which ties into Sun’s full-time PM plan.
To ensure that each machine gets the service attention it needs to perform on demand, Sun says it keeps two units on the job, with another on the bench. “One 818 sits on top of the pile and feeds the shredder,” says Shipp “While the shredder is processing, the loader can pre-sort oversize items out of the stream, such as big concrete, metal, cable, tanker vessels. Another 818 sits at the other end of the stream, loading out residual material.”
While two of the 818s handle the workload of the 10-hour day, the third unit is getting serviced. “Our machines look terrible at the end of a week-long shift,” Shipp admits. “We rotate out one of the machines so it can get a thorough cleaning. We’ll do two or three rotations between scheduled maintenance intervals.”
The Sennebogen machines are all equipped with hydraulic reversing fans. Shipp says they pause a few times each day to run the fans and clear the cooling system, then they dig into the stockpiles once more.
Meanwhile, factory-trained technicians from Midlantic are routinely onsite to maintain and inspect one of the waste handlers. “Any gremlins we have had, Midlantic figured it out quickly,” Shipp says. On the next rotation cycle, the technicians apply any adjustments they made to the other two machines, to prevent the same problem from coming up again. Sun signed on for Midlantic’s service plans, and Sennebogen’s built-in Sencon software keeps Midlantic aware of the machines’ service needs.
The 818’s responsive hydraulics and agile grapple allow a single machine to pre-sort material while it keeps the shredder fed and producing, says the company. Sun’s efficiency in reclaiming material for recycling has allowed the firm is able to offer LEED credits for customer projects.
With 4,000 hours on the original 818 and about 3,000 hours on the other two, Shipp says of the units, “They have been exponentially better than excavators we used previously. We’re very happy with them. When it comes time to open our next plant, we plan to build our fleet with Sennebogen when the time comes.”