The MPH122 features a 92-inch-wide, center-slung universal rotor that can be used for asphalt reclamation as well as soil stabilization. "The center-slung rotor holds an even cutting depth, which is exactly what Persant needs for this application," explains Mickey Cereoli, landfill and soil stabilization specialist for Bomag Americas Inc. Although Persant cuts to a depth of only one foot per pass, the machine's 48-inch-diameter rotor is capable of cutting to depths reaching nearly 20 inches.
One machine feature that drew Persant to the Bomag is its hydraulics system. Hydrostatic drive not only powers the steering and four-wheel-drive but also the cutting drum's rotation. A built-in hydraulic relief system automatically stops the rotor's rotation when an obstruction is encountered, preventing damage to the drum and rotor drive system.
"The other machines we looked at had planetary drives, which were designed to be the weakest point of the rotor," says Pernas. "These rotors will break at the planetary, which costs about $24,000 to replace." Persant's high utilization need for a recycler/stabilizer — logging nearly 200 hours within the first three months of ownership — combined with the dense lime and cap rock places a lot of stress on the machine's rotor. Pernas estimates that the company would have had to replace at least one planetary each year, if it were to have chosen a stabilizer with a mechanical drive system.
One of Pernas' initial concerns in this application, however, was if the MPH122 had enough horsepower to cut through the dense rock. He recalled some manufacturers stressed that high horsepower requirements would be necessary. But Pernas quickly discovered that the Bomag had more than enough power due to its hydrostatic drive system.
"The MPH122 has a proportional power system that enables the operator to manually dial in the power requirements," explains Cereoli. "This system allows the machine to use available horsepower more efficiently."
The new application for the recycler/stabilizer saves Persant manpower as well. It still requires the use of a dozer to move the blended soil and rock off to the side of the road. However, according to Pernas, "We can now use the same operator to run both the MPH and dozer, whereas the old way required us to have two dozers and operators."
Elimination of the additional operator, the need to truck excess soil off site and a lengthy process to cut the existing terrain to grade is only the beginning of the benefits for employing the recycler/stabilizer. When Persant encounters a site with questionable soil content, the company can use the MPH122 for its originally-intended purpose, soil stabilization.
Dade County has certain soil specifications for new development housing pads. If areas of questionable soil exist within a development, Persant can bring the soil to meet spec with the MPH122. "If a pad was to have about six inches of out-of-spec soil, we will run the rotor down a foot to blend the soil and bring it to spec," says Pernas.
This is a money saver for the contractor, since there is no need to remove the questionable soil and replace it with virgin aggregate. The versatile machine will also allow Persant to make soil improvements by blending in additives like lime or Portland cement, should the need arise. And with the recycler/stabilizer's universal rotor, the company can expand its paving side of the business by offering low-cost, full-depth reclamation services for deteriorating roads.
However, most important to Persant is that using the MPH122 in this new application has turned a time-consuming, inefficient process into a quick method of cutting high grade lime and cap rock into new roadways. "We now get more jobs done quicker, which helps to build a better rapport with our customers," says Pernas. Something that will help keep this small, Miami-based contractor successfully conducting business for another 30 years.