Automated transmissions enhance uptime and service for fleets

Automated transmissions are revolutionizing the vocational trucking industry, offering a blend of efficiency, durability, and ease of service that traditional manual systems lack. As fleets aim to optimize performance while minimizing downtime, understanding these advancements becomes crucial for operators and decision-makers alike.

Kenworth has been at the forefront of this evolution, bringing innovative solutions to the market that cater specifically to the rigorous demands of vocational applications. With their latest designs, they’re not just enhancing functionality; they’re redefining what’s possible in heavy-duty trucking.

Purpose-Built Automated Transmissions

Automated transmissions have evolved significantly since their inception as “automated manuals.” According to Alex Reid, the vocational segment manager at Kenworth, modern designs are not mere adaptations of manual systems but rather purpose-built transmissions that prioritize performance and reliability.

“The latest models we produce are designed from the ground up as automated transmissions,” Reid states. “This shift allows for faster shifting and enhanced durability, aspects that are critical for vocational fleets.”

Unlike traditional automated manual transmissions (AMTs), these new designs come without the limitations associated with manual setups. Key features include:

• Enhanced shifting speeds
• Improved durability under load
• Greater efficiency due to the absence of a torque converter

By leveraging a mechanical foundation while eliminating unnecessary complexities, Kenworth’s transmissions achieve significant weight savings and operational efficiency.

Designs Tailored for Vocational Needs

Kenworth's introduction of the PACCAR TX-12 transmission in 2017 marked a pivotal moment in vocational truck design. This transmission is specifically engineered to meet the unique challenges faced by fleets operating in demanding environments.

“In developing our vocational AMTs, we focused on proven designs,” Reid mentions. “This includes features like twin countershaft layouts and helical cut gears, known to withstand extreme conditions.”

Key design elements include:

• Large bearings secured with pinning to prevent movement
• Drilled and pinned gears to enhance stability under heavy loads
• An aluminum case that improves cooling efficiency

These meticulous design choices ensure that even in the harshest conditions, the transmission remains reliable and efficient. The new 18-speed transmission's aluminum casing not only contributes to weight reduction but also facilitates better cooling, critical for severe applications.

Power Take-Off (PTO) Capabilities and Flexibility

In vocational trucking, the transmission plays a central role in powering various body equipment. Understanding this, Kenworth prioritized PTO capabilities in their latest transmission lineup.

“Our vocational transmission features a dedicated PTO shaft linked directly to the input shaft,” Reid explains. “This separation allows for increased horsepower and torque, independent of the forward gears.”

Additionally, Kenworth has incorporated flexible PTO options for easier integration with auxiliary equipment. Key features include:

• A standard eight-bolt PTO setup for conventional applications
• A new rear four-bolt option for hydraulic pumps or driveshafts
• Consistent horsepower and torque output across both configurations

This flexibility means operators can choose the most convenient setup without compromising performance, streamlining the upfitting process for various vocational applications.

Innovative Driver Assistance Features

Another noteworthy advancement in Kenworth’s automated transmissions is the introduction of a mode that mimics manual operations, aptly named “rock free mode.” This feature addresses a common issue faced on job sites—vehicles getting stuck.

“In manual trucks, drivers often used the clutch to rock the vehicle free,” Reid notes. “We’ve created a software solution that replicates this technique.”

Key aspects of rock free mode include:

• Temporary throttle engagement to simulate clutch operation
• Assistance in quickly moving the vehicle in forward or reverse
• Automatic return to normal driving mode once the vehicle is unstuck

This innovative feature allows drivers to effectively manage challenging situations without the need for a traditional clutch, enhancing operational efficiency and reducing driver stress.

Simplified Maintenance and Service

As vocational fleets increasingly adopt automated transmissions, maintenance and service support become critical considerations. Kenworth’s approach to serviceability is designed to minimize downtime and enhance the lifespan of the transmission.

“We recommend adjusting oil change intervals based on service conditions,” Reid emphasizes. “For example, our light-duty applications may have intervals up to 750,000 miles, but severe duty applications might necessitate more frequent changes.”

Key maintenance features include:

• Elimination of oil filters, reducing the complexity of oil changes
• Maintenance-free self-adjusting clutches, allowing for a smoother driving experience
• Calibrated transmission controllers that adapt to clutch replacements without extensive readjustment

By prioritizing ease of maintenance, Kenworth not only improves serviceability but also extends the operational life of their transmissions, making them a more appealing option for heavy-duty vocational fleets.

For a deeper understanding of these advanced technologies, you can watch this informative video that showcases some of the key features of Kenworth’s automated transmissions:

The newest generation of automated transmissions from Kenworth represents a significant leap forward, merging cutting-edge engineering with practical features designed for vocational applications. With improved performance, enhanced driver assistance options, and a focus on service simplicity, these transmissions are set to redefine expectations for vocational fleets.

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