Unlike AMTs, which are typically built upon a manual gearbox foundation with electronics installed to automate the shifting, the Paccar transmission was built from a clean sheet design, to function as a purely automated transmission right from the start. This is not an automated manual transmission (AMT), Paccar officials emphasized. 22 took the wraps off its new automated transmission, three years in the making and designed in close collaboration with Eaton engineers, some of whom were embedded at the Paccar Technical Center here, where much of the development took place. But the transmission is a vital piece of the powertrain, which until now, has been sourced from Eaton, and maybe not optimally designed from the ground up to work specifically with the Paccar MX engines and axle. The manufacturer launched its own MX-series engine in 2010 and a 40,000-lb tandem drive axle last year. – There’s nothing quite like driving a truck with a completely dialed in powertrain, each component communicating fluently with the others as one cohesive system.Īnd that’s exactly what Paccar has gone to great lengths to achieve through the design of its own transmission, to complete the integration puzzle that until now lacked one of the most critical components. Nonetheless, it does take some practice time to shift smoothly.By James Menzies Aug VERNON, Wash. REMEMBER: Learning to shift an 18 speed transmission pattern is not difficult. It depends on the weight of the load, terrain and several other factors. There are 15 forward gears in 3 ‘H Positions’įor the average driver, many of these gears will never be used.It’s easy to get a heavy load rolling without abusing the clutch. In this situation, the 3 low forward starting gears of the 18 speed, are just the ticket to a smooth start. Or maybe you are trying to get a set of loaded B trains going from a dead stop after chaining up on a grade. There may be times when you’re trying to lift a heavy load from a dead stop.There are 3 reverse speeds in reverse.This is the best way to understand the positioning of all 18 gears. This is a very simple basic diagram of the shifting pattern of an 18 speed transmission. Related > 5 Tips For Truckers For Effective Use of Cruise Control 18 Speed Transmission Shift Pattern Diagram (Gear Pattern) There are plenty of other gears in between. The driver uses second, third, fourth, and fifth, then splits up into high range and then shift the H pattern again for sixth, seventh, eighth and ninth gear. The easiest way to become familiar with the 18 speed is to practice shifting in an H pattern. The 18 speed transmission is laid out in an ‘ H’ pattern. Related > How to Float Gears in a Semi Truck Steps to Shifting an 18 Speed Transmission In that case, they can be split up or down accordingly, matching the RPM’S to the engine’s sweet spot.ĭrivers who like floating gears should like the 18 speed, as 12 of the 18 gears available do not require moving the shifter, as they are split gears. The more a driver practices, and the more experience he gains, he may find that the gear being used, may not be quite the right one for where he wants the RPM’S to be. It might sound a bit complicated at first, but it’s really not. There are plenty of other gears in between, as all main gears have a high range and low range, so that the driver can split any of the gears, twice more. After reaching ninth gear, split up to overdrive for the top gear.Then, shift the H pattern again for sixth, seventh, eighth and ninth gear. The driver uses second, third, fourth, and fifth, then splits up into high range.
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