Mack Command Steer: The Electric-Assist Steering System That Changes How a Granite Dump Truck Feels in Your Hands

Oct 5

6 min read

Steering effort is one of those things a driver never thinks about until a bad day reminds them how much it matters, a loaded truck at walking speed in a tight pit, a sudden correction on wet pavement, or ten hours of low-speed maneuvering that leaves shoulders aching by quitting time. For decades, every dump truck on the road, across every brand, has used some version of the same solution: a hydraulic power steering gear that multiplies the driver's input. Mack changed that formula on the Granite, and it is worth understanding exactly what changed and what did not.

The Predecessor: Standard Hydraulic Power Steering, Still the Industry Baseline

Kenworth's T880, Freightliner's 114SD, and International's HX Series all run conventional hydraulic power steering gears, the same basic architecture the entire heavy truck industry has used for decades, typically sourced from established steering-gear suppliers like TRW or Sheppard. A hydraulic pump driven off the engine supplies pressure to a steering gearbox, which multiplies the driver's hand effort into enough force to turn heavily loaded front axles. It works, it is well understood by every fleet technician in the country, and it has carried vocational trucks through every kind of jobsite for generations. It is also, by design, a fixed-ratio system: the amount of assist does not change based on speed, road surface, or how loaded the front axle happens to be at that moment.

What Changed: Mack's Command Steer

Mack's Command Steer, now available on the Granite, keeps the existing hydraulic steering system in place but adds an electric motor working alongside it. The system uses sensors monitoring the truck thousands of times per second and varies the steering effort in real time rather than applying the same fixed assist regardless of conditions. In practice that means less effort required at low speeds and in tight maneuvering, automatic smoothing of the kickback a driver would normally feel from potholes and uneven surfaces, and a return-to-center function that helps straighten the wheel out of a turn without the driver muscling it back. Mack has described the reduction in driver steering effort as dramatic compared to a standard hydraulic-only setup.

Why This Actually Matters on a Jobsite, Not Just a Spec Sheet

Lower driver fatigue over a shift full of low-speed maneuvering, backing, and spotting at a pit or demolition site
Smoother feedback over rough or unimproved ground, which means less jolt transmitted back through the wheel on every pothole or rut
A return-to-center assist that helps a driver straighten out faster after a sharp turn, useful on tight site access roads
Standard hydraulic steering on Kenworth, Freightliner, and International remains proven, simple to service, and familiar to every shop technician in the country

None of this makes standard hydraulic steering obsolete. It is still the simpler system to diagnose and repair, with decades of parts availability and technician familiarity behind it, and that counts for something on a fleet that values straightforward maintenance over the newest feature on the lot. But for an operation running tight, high-maneuvering duty cycles, repeated spotting in congested yards, or drivers logging long shifts on rough ground, the reduction in physical steering effort is a genuine quality-of-life and fatigue-management upgrade, not a marketing gimmick.

The Rent-vs-Own Angle

A rental fleet is not going to have a mix of Command Steer-equipped and standard-steering trucks for you to choose between depending on the job, you get whatever is on the lot. Owning the truck means you can spec the steering system that fits how your crews actually run, and keep that configuration consistent across your fleet instead of adapting to whatever a rental counter happens to have available that week. BFC provides equipment financing nationwide for hauling and demolition businesses that want to spec the truck, not settle for one.

How the Sensor System Actually Works

Command Steer's sensor network monitors truck behavior thousands of times per second, far faster than a human driver could ever consciously react, and uses that data to continuously adjust how much electric assist the motor adds on top of the existing hydraulic system. That high sampling rate is what allows the system to smooth out small, constant disturbances, road texture, minor surface irregularities, low-speed creep, in something close to real time rather than reacting a beat behind the actual event the way a purely mechanical hydraulic system does. The practical result is a steering feel that adapts itself to the moment rather than applying the same fixed assist whether the truck is crawling through a tight yard or holding a straight line on an access road.

What This Means for Driver Training and Onboarding

A new driver stepping into a Command Steer-equipped Granite for the first time after years on conventional hydraulic steering will notice the difference immediately, in a good way, but it is still worth a few minutes of deliberate orientation rather than assuming the system is simply intuitive from the first mile. Understanding that the return-to-center function will actively help straighten the wheel out of a turn, for instance, changes how a driver should expect the truck to behave coming out of a sharp maneuver, and knowing that ahead of time prevents a driver from fighting a system that is actually trying to help them.

Command Steer works alongside, not instead of, the existing hydraulic system, so a technician can still service the base steering gear using familiar procedures
The electric motor component does add a new system for a shop to understand diagnostically, worth confirming your service network is equipped to support
Reduced physical driver fatigue over a shift can be a genuine talking point in driver recruitment, particularly for operations competing for CDL-A talent

Comparing This to Electric Power Steering in Passenger Vehicles

Drivers coming from modern passenger vehicles, where electric power steering has been standard for years, might assume Command Steer is simply the truck industry catching up to automotive technology, but the engineering challenge is genuinely different at this scale. A passenger car's steering system manages a few hundred pounds of front-axle load; a loaded Class 8 dump truck's front axle can carry many times that, which is exactly why Mack kept the hydraulic system in place and added electric assist on top of it rather than replacing hydraulics outright the way a passenger car does. That hybrid approach reflects a sober engineering judgment that pure electric steering is not yet practical at this weight class, while still capturing much of the responsiveness and effort reduction that makes electric assist desirable in the first place.

Questions Worth Asking Your Mack Dealer

Before ordering a Command Steer-equipped Granite, it is worth asking your dealer a few direct questions: what the diagnostic process looks like if the system throws a fault code, whether your local service bay has been trained on the new electric-assist component specifically, and what the realistic lead time is on replacement parts if the motor or its sensors ever need servicing. A genuinely good feature is only as good as your ability to keep it running, and getting straight answers on serviceability before you buy beats discovering gaps in your dealer's readiness after the truck is already in daily use.

Long-Term Reliability Is Still Being Written

Command Steer is new enough that long-term, high-mileage reliability data across thousands of trucks in varied duty cycles simply does not exist yet in the way it does for conventional hydraulic steering, which has decades of real-world service history behind it across every brand. That is not a reason to avoid the system, since Mack would not bring an unproven safety-critical component to market without extensive internal testing, but it is a reason for an early adopter to stay engaged with their dealer on any service bulletins or field updates that emerge as the system accumulates real-world hours across a broader customer base. Buyers who prefer to let a new technology prove itself over a few model years before adopting it are not being unreasonable, and that is a legitimate, defensible approach to a genuinely new system like this one.