In a continuation of efforts to offer solutions for an expansive range of customer applications, Mack Trucks announced in March two additional versions of the mDRIVE™ HD automated manual transmission and a new single-unit exhaust aftertreatment system called ClearTech™ One. Mack launched both the transmissions and EATS at The Work Truck Show in Indianapolis, and both will be available for order in August. Customers can spec the low-speed reduction gear transmissions with Mack’s MP® series engines in Pinnacle™, Granite® and Titan by Mack trucks, while ClearTech One will be available in Pinnacle and Granite models. The new transmissions are the mDRIVE HD 13-speed and the mDRIVE HD 14-speed. The 13-speed option, available in direct or overdrive confi gurations, offers a low-speed reduction gear ratio designed for easier starting on steep grades and under heavy load, while the 14-speed option, offered in an overdrive confi guration, adds an ultra-low-speed reduction gear aimed at paving operations and low-speed, heavy-haul maneuvering. Both models provide three low-speed and one fast-speed reverse gear ratios. The new mDRIVE HD models share architecture and gear ratios for 12 forward speeds with the standard mDRIVE HD, which Mack unveiled in February 2015. “We launched the original mDRIVE HD in response to customers looking for an AMT capable of withstanding tough vocational applications,” says John Walsh, vice president of marketing for Mack. “Now, with the mDRIVE HD 13- and 14-speeds, we’re taking the next step and combining low-speed capabilities with the performance and productivity benefi ts of our ground-breaking AMT.” The new gears improve not only performance in off-road and construction applications, but also on-road fuel economy through a faster rear-axle ratio, says Stu Russoli, highway and powertrain products marketing manager for Mack. “What we found was when people go into a pit or on a jobsite they were actually gearing their rear-axle ratio a little bit lower so they could do the work at the jobsite,” Russoli says. “That’s where the 13-speed comes in. Now we’ve added a 17:1 bottom gear, so after you hit fi rst gear you go down to a creeper gear. Now I can work in the pit and still have my faster rear-axle ratio, where I can get to my highway speeds … and get really good fuel economy, but still be able to do the work in my off-road situations.” The 14-speed option adds two lower gears, allowing the operator to shift down to a creeper two and creeper one. “That brings you into your curb-pouring applications or your paving applications where you need to go at a walking speed, that half mile an hour or in that range,” Russoli says. Without the 14-speed option, he says operators have to press on the brake all the time, which can lead to overheating the clutch. “The mDRIVE HD is just as at home on the highway as it is on the jobsite,” Russoli says. “Highway customers with challenging loads will appreciate the extra flexibility provided by the low reduction gear ratios.” An extension on the transmission between the bell housing and the main case makes the additional gears possible. The new versions of the transmission are less than five inches longer and only 90 pounds heavier than the standard mDRIVE HD, giving them a weight advantage of nearly 150 pounds compared with automatic transmissions. Mack also announced all mDRIVE transmissions, including the standard mDRIVE and mDRIVE HD, are receiving the following performance and durability updates: a redesigned gearbox control unit, a new clutch with a larger torsional damper to help reduce vibration, the addition of component-wear monitors to enable predictive maintenance; and improvements to power take-off controls including new main cab harnesses, a reinforced range housing to handle higher PTO bending torque and an all-new, cab-mounted Body Builder Module with user-confi gured software parameters to control engine speed and block reverse gears when the PTO is engaged. Dual PTOs are now supported as well. “PTOs are a critical component for many vocational customers,” says Curtis Dorwart, vocational products marketing manager for Mack. “With the added functionality delivered by the new Body Builder Module and other improvements, we’re giving customers the tools they need to be successful in nearly any application.” ClearTech One The addition of the ClearTech One exhaust aftertreatment system also offers customers increased options depending on their applications. ClearTech One combines the diesel particulate fi lter, selective catalytic reduction technology and diesel exhaust fl uid dosing system into one unit, providing increased room for chassis-mounted equipment, which is often needed on work trucks and short-wheelbase tractors. Customers also will be able to choose larger fuel tanks without lengthening wheelbase. “Mack ClearTech One offers our customers a functional design, as well as another EATS option, enabling more packaging space for equipment needs while also increasing maneuverability of the vehicle,” Walsh says. The smaller system allows for a shorter wheelbase, improving maneuverability, and is about 15 pounds lighter than the two-unit EATS. ClearTech One is optimized for passive regeneration and SCR performance. The SCR catalyst is mounted downstream of the DPF, preventing hydrocarbon, ash or soot from entering the system. There is no need for a second diesel oxidation catalyst before the SCR system. Mack will continue offering the two-unit ClearTech EATS for specifi c applications, including tandem steering. “Mack customers now have the opportunity to specify the design of the EATS, which better enables them to adapt the chassis to their application’s unique needs,” Dorwart says.
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