Electric tow tractors are becoming an increasingly important part of modern ground support equipment fleets. As airports and cargo operations expand electric adoption, equipment buyers are looking beyond basic specifications to understand how design and engineering decisions affect long-term performance.
At Harlan, electric tractors are built with a focus on durability, safety, and serviceability in demanding ramp environments. From high-torque drive systems to advanced electronic controls, several key features contribute to the performance and reliability operators depend on every day. Learn more about our electric aircraft tow tractors and how they support modern ground handling operations.
Advanced Electric Drive Systems
At the core of every electric tow tractor is the drive system responsible for delivering the torque required to move heavy aircraft ground equipment.
Harlan electric tractors utilize a Harlan-Speth integrated drive axle paired with a Schabmueller AC traction motor. This system is rated at approximately 23 kW (30.8 horsepower) and delivers 288 ft-lb of torque, providing strong pulling power and responsive acceleration.
Electric motors have a key advantage over internal combustion engines: instant torque delivery. Rather than gradually building power, electric motors deliver maximum torque immediately when the operator applies throttle input. This allows tow tractors to move heavy loads smoothly from a standstill — particularly valuable when maneuvering aircraft equipment in tight ramp spaces.
The integrated drive axle also reduces drivetrain complexity by combining multiple components into a single compact system. Fewer mechanical interfaces translate into improved reliability and reduced maintenance requirements over time.
Intelligent Motor Control Systems
Modern electric tractors rely heavily on advanced electronic control systems to manage power delivery, efficiency, and safety.
Harlan electric tractors use Curtis programmable AC motor controllers, widely recognized across the material handling and GSE industries for their reliability and flexibility. These controllers use a dual-microprocessor architecture, allowing critical systems to continuously cross-check signals and maintain safe operation.
One of the key technologies used in these controllers is vector motor control, which allows the controller to precisely regulate torque and speed across the entire operating range. This results in smoother acceleration, improved grade performance, and more efficient power usage.
The controller also supports advanced programming through Vehicle Control Language (VCL), enabling manufacturers to configure vehicle behavior and logic functions to match specific operational needs.
For operators and service technicians, integrated diagnostics and status indicators provide valuable system feedback. Built-in monitoring tools allow technicians to quickly identify faults, review operating conditions, and simplify troubleshooting when service is required.
Lithium-Ion Battery Technology
Battery technology plays a critical role in the usability and productivity of electric tow tractors.
Harlan electric tractors utilize lithium-ion battery systems, which offer several advantages compared to traditional battery technologies. Lithium-ion batteries provide higher energy density, longer service life, and more consistent performance throughout the discharge cycle.
These systems also support fast-charge capability, allowing operators to recharge equipment during scheduled downtime or shift transitions. For many ground handling operations, this flexibility allows electric tractors to support full shift operations without requiring battery swaps.
When combined with regenerative braking systems, lithium-ion batteries also help improve overall energy efficiency by capturing energy during deceleration and returning it to the battery system.
Safety Systems Designed
for Ramp Operations
Airport ramp environments require equipment that prioritizes both operator safety and situational awareness.
Harlan electric tractors incorporate several safety features designed specifically for these conditions. Standard equipment includes backup alarms, seat belts for both operator and passenger, and an easily accessible emergency mushroom-style shutoff switch located on the dash.
Additional safety systems include an electrically actuated park brake that automatically engages when the tractor is shut down. This feature helps prevent unintended vehicle movement when the equipment is parked on the ramp.
A battery disconnect switch provides an additional safety layer during maintenance or emergency situations, allowing technicians to quickly isolate electrical power when servicing the vehicle.
Together, these systems help operators maintain safe operation while working around aircraft, cargo equipment, and ground personnel.
Built for Serviceability
and Long-Term Reliability
Reliability in ground support equipment depends not only on component quality, but also on how easily equipment can be maintained over its lifespan.
Harlan electric tractors are designed with simplified drivetrains and fewer moving parts than traditional combustion-engine equipment. This reduces the number of wear components and eliminates maintenance tasks such as oil changes, emissions system servicing, and fuel system repairs.
Service technicians benefit from accessible maintenance panels and integrated diagnostics, allowing routine inspections and troubleshooting to be completed quickly. These design considerations help minimize downtime and keep equipment operating reliably across demanding daily schedules.
Manufactured and Assembled
in the United States
Harlan tractors are assembled in Kansas, where final assembly, system integration, and testing take place. Many components are machined and prepared in-house, allowing the company to maintain close control over quality and fitment.
By combining proven industry components with careful assembly and engineering oversight, Harlan tractors are built to deliver dependable performance in the demanding conditions of airport ground operations.
The Value of Purpose-Built
Electric Tow Tractors
Electric tow tractors continue to evolve as battery technology, control systems, and drivetrain design improve. Today’s equipment offers high torque, sophisticated electronic control, and simplified maintenance compared to traditional engine-powered vehicles.
For airport operators, cargo handlers, and maintenance teams, these advancements translate into equipment that is efficient, reliable, and well suited for the evolving demands of modern ground support operations.
As electric adoption grows, purpose-built tractors designed specifically for airport environments will continue to play an increasingly important role in ground support equipment fleets.
Speak with our team to learn how Harlan electric tractors can support your ground handling operations.
Inside Harlan Electric Tractors: Key Features That Improve Performance and Reliability