How to Use a 12-Speed Transmission in Large Trucks?

1 Answers
DiWalter
07/29/25 8:08pm
12-speed transmissions in large trucks are divided into high and low ranges, with 6 forward gears in the low range. The high range also has 6 gears. When starting, choose either the low or high range based on the vehicle's load condition, then use the corresponding 1st gear to start. The gear lever has an up-and-down mechanism. In a 12-speed transmission, pushing it downward engages the low range (gears 1-6), while lifting it upward engages the high range (gears 7-12). When shifting gears in a large truck, pay attention to vehicle speed and idle speed. Shifting is easier when the truck is empty. To shift gears, first press the clutch, then engage the gear. To change gears, press the clutch to disengage the current gear, then press the clutch again to engage the new gear.
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