How many types of Sinotruk 12-speed transmissions are there?
3 Answers
Sinotruk 12-speed transmissions come in four to five types. Below are relevant introductions about transmissions: 1. Main functions: Changing the transmission ratio to expand the variation range of driving wheel torque and speed, adapting to frequently changing driving conditions while keeping the engine operating under favorable conditions. When the engine rotation direction remains unchanged, it enables the vehicle to only move in reverse; by utilizing neutral gear, it interrupts power transmission, allowing the engine to start, shift gears, and facilitating gear changes or power output. 2. Working principle: Manual transmissions mainly consist of gears and shafts, achieving speed and torque variation through different gear combinations; whereas automatic transmissions (AT) are composed of hydraulic torque converters, planetary gears, and hydraulic control systems, achieving speed and torque variation through hydraulic transmission and gear combinations.
As a veteran heavy truck driver with years of experience, I'm very familiar with Sinotruk's 12-speed transmission. The HW series most commonly features the HW12, which currently comes in two main types: pure manual transmission and semi-automatic transmission with AMT functionality. The manual version offers direct operation, making it suitable for mountainous terrain and heavy loads, but can be tiring during long drives. The AMT version automatically shifts gears, saving fuel and reducing driver fatigue, especially convenient on highways. Transmission ratio differences must also be considered, as different engine models (such as Weichai or Cummins) paired with the truck will affect transmission tuning. I've used manual transmission HOWO trucks that excel in uphill power, while AMT proves more worry-free in express delivery operations. My advice is to test drive before purchasing - evaluate gear shift smoothness and noise issues rather than focusing solely on price and neglecting driving comfort.
In the repair shop, I often work on heavy-duty truck transmissions. The mainstream HW12 series comes in two configurations: the standard manual version and the AMT version. The manual version has a simple structure and durable gears. When it breaks down, I usually find issues with the shift lever or bearings during disassembly and inspection. The AMT version is more complex, with multiple electronic control units prone to circuit failures, such as poor sensor contact or software bugs causing gear shift delays. During repairs, a diagnostic computer is needed to check for fault codes. I advise vehicle owners to perform regular oil changes and maintenance: manual transmissions are recommended for servicing every 80,000 kilometers, while the more delicate AMT system requires inspection every 60,000 kilometers. I've seen AMT vehicles suddenly fail on the road, so it's advisable to have a manual backup plan for long-distance trips. Choosing a transmission depends on the usage scenario: manual transmissions are better for heavy loads in mining, while AMT is more intelligent and fuel-efficient for light logistics loads.
