Photo: Allison Transmission WT: What benefits does an automatic transmission have over a fully manual transmission on driver productivity? In the case of a mixer truck, that lost downtime can be as much as $7,500 per truck per day.Īnd, that’s assuming that the barrel wasn’t full when the automated manual transmission clutch failure occurred, which would add additional repair cost to replace the barrel.Īllison’s 4000 Series is built for heavy-duty vehicles. Many fleets have indicated they can operate a smaller fleet with automatic-equipped trucks, because each truck spends less time being repaired, whether proactively or worst case, reactively. This ensures maximum uptime and productivity for a fleet’s trucks. These interrupts result in more shifts and lower vehicle speeds, requiring more time to do the same job.Īs a second example, fully automatic transmissions eliminate the starting clutch, thereby eliminating truck downtime for required clutch replacements. They also require a reduction of engine throttle at each shift, causing torque interrupts. Unfortunately for those operating AMT-equipped trucks, this is when peak torque is most needed, to get a fully loaded vehicle moving from a stop.Īutomated manual transmissions do not benefit from engine torque multiplication because they require torque to be controlled or limited at launch to extend the life of the starting clutch. Therefore, AMT-equipped trucks never utilize full engine torque at launch. The full-power shifts provide superior vehicle acceleration, allowing more work to be done in less time.įLEET TIP: Do you know how to select the right engine and transmission combo for your work truck? Check out these 13 tips!īy comparison, automated manual transmissions must cut engine torque at launch to protect the clutch. Among the many advantages, automatics are more productive because they enable faster acceleration than AMTs.Īllison Transmission's torque converter smoothly multiplies engine torque at launch and keeps the transmission continuously connected to the engine's maximum available output during each shift, providing up to 14% faster acceleration. HARBIN: Automatics provide multiple productivity advantages over competitive automated manual transmissions. WT: What benefits does an automatic transmission have over an automated manual transmission on driver productivity? Without a torque converter, automated manual transmissions cannot deliver power to the wheels smoothly, creating more opportunities for inefficient and uncontrolled operation. Drivers can control vehicle speed to smoothly creep with precision, maneuver more easily and have more control on grades – all while protecting the driveline from shock and reducing vehicle wear and tear. A torque converter creates an infinitely variable gear ratio, allowing drivers to easily manage power to the wheels. By comparison, the automatic’s torque converter is not a wear component.īeyond the uptime advantage of the fully automatic transmission, the torque converter provides improved maneuverability in soft/loose soil or where drivers need more control.Īutomated manual transmission, by comparison, typically begin to overheat and will cut power to protect the transmission in soft/loose soil. These power interrupts cost drivers time and lead to higher maintenance costs due to wear and tear on the clutch. While the clutch pedal is removed in an automated manual, automated manual transmissions still use a standard manual gearbox with electrical or pneumatic clutch actuation, resulting in torque interrupts and loss of power during shifts. Boost it Up: Mack MD with Allison Vocational Transmission
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