Terra Drive Systems (TDS)

The full power of agricultural equipment, such as combine harvesters, needs to be effectively harnessed to navigate diverse terrains. Despite machines that are ordered with a 2WD setup and highly specialized off-road tires, transferring their enormous torque and traction to the ground is a struggle, especially in wet and muddy conditions. This results in deep field ruts that damage terrain and crops, as well as lost production time.

terra Drive Systems (TDS), a global manufacturer of steerable hydraulic drive solutions, addresses this challenge by developing the Mud Hog RWD axle, a unique rear-wheel-drive system. This innovative solution enables agricultural vehicles to conquer challenging terrains and harsh conditions by providing traction on all surfaces, ensuring maneuverability and improved stability.

"We initially designed the solution for the rear drive of the combine harvester, enabling farmers harvesting rice in challenging muddy terrains to benefit from all-wheel drive. Farmers can purchase the Mud Hog product on newly purchased machinery or as an aftermarket kit for existing combines through our global network of dealers," says Ben Harpenau, President and CEO of TDS.

Delivering Unmatched Potential

Mud Hog axles are hydraulic-powered Axle Systems that are ready to install and can be adapted to equipment with both traditional and hydrostatic primary transmissions, such as motor graders and Turf Care Equipment used for example in construction and golf course maintenance and similar operations. To further improve traction on Harvesting Equipment in the toughest conditions, there is a bolt-on rear track solution Mud Hog X-Tracks. This conversion Mud Hog X-Track System allows farmers to harvest in nearly any field condition, even in standing water, allowing them to work harvest at the optimal time while not jeopardizing soil compaction.

Building on the success of the Mud Hog brand in improving rear-end flotation, enhancing safety, and addressing traction needs in the agriculture space, TDS developed all-wheel drive (AWD) axles for the trucking industry under the EZ Trac label.

The EZ Trac AWD axle is a hydraulic drive system specifically designed for on-highway trucks, utility trucks, construction vehicles, cranes, and fire and rescue vehicles. It provides the drivability to complete off-road assignments while maintaining forward progress. The hydraulic front-wheel-drive axle improves traction and mobility on the road and is much simpler to use than traditional mechanical all-wheel drive. Engaging it is as easy as pressing a button, and the hydrostatic pump is activated on-demand using a hot shift power take-off without stopping the vehicle.

EZ Trac reduces the total cost of ownership through its low maintenance requirements. Other benefits include the truck's lower ride height, lighter weight compared to mechanical AWD systems, and improved turning radius. A lower ride height translates to a lower center of gravity, increasing downforce while reducing drag and improving handling performance. The lightweight design makes it 800 to 1,200 pounds lighter than traditional drive systems, leading to reduced fuel consumption.

The improved turning radius, adequate ride height, light weight, automatic engagement, and ease of use make the product ideal for both on and off-road use.

Focused on Quality

TDS follows lean manufacturing principles and serves as a vertically integrated facility, ensuring complete control over each stage of the production process, instead of relying on external contractors or suppliers. This approach, which includes manufacturing, fabrication, assembly, painting, packaging, kitting and shipping, allows TDS to consistently serve its clients. The combination of certified technicians and in-house capabilities enables it to deliver end-to-end services with unmatched proficiency.

As an ISO 9001-certified company, TDS places strong emphasis on ensuring the highest product quality. The quality assurance process begins with exceptional, error-free product designs, including comprehensive finite element analysis (FEA). The next step involves conducting simulated tests in both the lab and field under various conditions. Each axle undergoes testing on a hydraulic test bench, adhering to the highest industry standards to ensure proper functionality. Multiple quality assurance steps throughout the manufacturing process guarantee that each unit meets the required standards.

"Our focus on quality has brought longevity and trust to our products. Farmers have been using Mud Hog for decades. They are familiar with the brand and have confidence in having a positive experience with our products," says Harpenau.


TDS provides robust maintenance and service amenities through global collaborations with spare parts dealers. It establishes trustworthy relationships with clients by offering complete transparency of costs and timelines for installation and delivery.

Committed to Support

It also provides driver and mechanic training to ensure clients are familiar with its products and understand their use. Even if the product is purchased through a dealer, the TDS team provides training to ensure a positive experience. Whether it's an OEM, dealer or end-user, the team helps troubleshoot and deliver the highest-quality customer service.

TDS showcased its commitment to customer support when a dealer urgently needed a rear axle for a combine harvester. The dealer was running late and would have reached the warehouse after closing time, potentially causing the farmer to lose an entire day of harvest in the fall, resulting in significant losses. One of the TDS employees, who lived close to the farmer, volunteered to deliver the axle to ensure the farmer could continue with the harvest. This instance demonstrates TDS' willingness to go the extra mile to resolve urgent situations.

Driving the Future with Continuous Improvement and Solutions

TDS is dedicated to bringing value to OEMs and end-users through continuous improvement to enhance the performance and efficiency of their products. Strong relationships with global OEMs enable TDS to provide solutions that align with their manufacturing strategies. In addition to delivering products that are easy to install and maintain, it offers technological advancements to enhance the on-field performance of harvesting equipmen

"Our scheduling flexibility and manufacturing capabilities along with fully-integrated design helps us build high-quality and high performance products," says Harpenau.

These cutting-edge designs and flexible approaches have enabled the Mud Hog brand to maintain its position as a leading designer and manufacturer for major OEMs worldwide. TDS closely monitors the latest technological and market trends, working with partners and its supply base to stay at the forefront of new market developments. It focuses on making hydraulic circuits more efficient to ensure greater power and torque. It also continuously supports OEMs in adding more incremental value to their products and making their processes more efficient.

The team's commitment, experience, work ethic, and innovation set TDS apart from other players in this space. Most of their experts have been with the company for over 15 years and have gained valuable experience from the agricultural industry's ups and downs. This day-to-day experience and deep understanding of client needs, coupled with a strong commitment to continuous growth, enable TDS to drive greater value for all their clients.