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How do you down shift an 8 speed quad axle Mack dump truck transmission?
Wiki User
∙ 10y ago
The best way to learn this is to have someone show you how. You're not going to learn this by just reading about it. A general rule of thumb is to downshift at 1000 RPMs, or 700 RPMs if you're dropping two gears. You would clutch, shift to neutral, hit the accelerator pedal, clutch, push it into the next lower gear at 1500 RPMs. This is a default taught at truck driving schools, and is not ideal for all engines and terrains. In soft dirt or soil, you'd downshift at a higher RPM, but you have to get accustomed to synchronizing your shifts yourself before you figure that part out... the manual transmissions (with the exception of the Volvo 14 speed) on Class 8 trucks in North America do not have a synchronizer gear, and the driver has to time their shifts in order to compensate for it. This is true whether the transmission is Eaton-Fuller, Rockwell, or a proprietary Mack transmission.
If you're looking for the shift pattern, we'd need to know the make and model of the transmission. I'm willing to bet the transmission is most likely an Eaton 9 speed or 8LL, but the pattern depends on the model... a double overdrive transmission has a different shift pattern than a direct drive or single overdrive transmission, typically.
Wiki User
∙ 10y ago
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