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What is an all terrain mixer?

An all terrain mixer is a self-propelled concrete mixer built to deliver and discharge ready-mix concrete on job sites where a conventional mixer truck simply can't reach. Unlike a standard rear-discharge or front-discharge mixer chassis built for paved roads, an all terrain mixer rides on a heavy-duty 4x4 or 6x6 articulated frame with high ground clearance, aggressive flotation tires, and a powerful drivetrain designed to handle mud, sand, slopes, and rough terrain. You'll see them on remote pours — wind farm foundations, oil and gas pads, mining operations, bridge abutments, and rural foundations where the only access is a graded dirt track.

The mixing drum, charge hopper, water tank, and discharge chute are all integrated onto the carrier, so the machine works as a complete batching-and-delivery unit. Most run drum capacities between 4 and 12 cubic yards, with hydraulic drum drives and operator controls accessible from ground level or the cab.

All terrain mixer vs. standard mixer truck

A standard mixer truck is built around a Class 8 highway chassis — Mack, Peterbilt, Kenworth, Freightliner — with a rear- or front-discharge drum mounted on top. They're efficient on paved routes from the batch plant to the site, but their low clearance and on-road tires struggle the moment the ground turns soft.

An all terrain mixer trades highway speed for off-road capability. The articulated frame steers tighter through tree lines and trenches, the all-wheel drive keeps you moving through muck that would bury a tandem-axle mixer, and the high-clearance undercarriage clears stumps and ruts that would tear out exhaust and air lines on a road truck. If your pours are consistently more than a few hundred feet off a maintained road, an all terrain unit pays for itself in productive days that would otherwise be cancelled or delayed waiting for site prep.

Top brands you'll find in our listings

Terex

Terex all terrain mixers, including the FDB and Bay-Lynx-built units, are widely used across North American oil patches and wind energy projects. Known for heavy-duty Cummins or Mercedes power, planetary drum drives, and chassis built to flex without cracking weld joints under sustained off-road loads.

Bay-Lynx

Bay-Lynx volumetric and drum-style mixers built on all terrain carriers are common in remote concrete delivery. The volumetric design lets the operator mix on-site to spec, which is a major advantage on jobs where a load can't be wasted if the pour gets delayed.

Oshkosh

Oshkosh S-Series and front-discharge all terrain mixers on 6x6 chassis are the workhorses on a lot of heavy civil and energy sites. Buyers value them for the proven driveline and the operator's clear sightline to the chute from a forward cab.

You'll also see units from MERLO, Carmix self-loading mixers, and custom builds on Western Star or International chassis. We list these regularly across both rbauction.com and IronPlanet.com.

What to look for when buying a used all terrain mixer

• Drum and fin wear: Pull the inspection hatch and look at the spiral fins inside the drum. Worn or patched fins mean the mixer is losing efficiency and concrete will start hanging up. Replacement fin kits are expensive and labor-heavy — factor that into your bid.
• Drum bearings and roller assembly: Listen for grinding or knocking when the drum rotates loaded. Worn front pedestal bearings or rear roller paths are a common high-cost repair on mixers with high hours.
• Hydraulic system: The drum drive and chute folding hydraulics work hard. Check for leaks at the planetary drive, inspect hose condition near pinch points, and verify the pump cycles cleanly with no cavitation noise.
• Frame and articulation joint: All terrain frames take a beating. Look for stress cracks at the articulation pivot, hairline fractures near suspension mounts, and any signs of previous weld repairs that weren't done properly.
• Drivetrain and axles: Confirm all-wheel drive engages on every axle. Check planetary hub oil for metal contamination and verify the differential lockups function — without them, you're stranded the first time you hit soft ground.
• Water system and admix dosing: The onboard water tank, meter, and admixture dispenser need to be accurate. A drifting water meter throws your mix ratio off and ruins pours. Test the calibration before you commit.

Buy used all terrain mixers at Ritchie Bros.

Browse our current inventory of all terrain mixers from Terex, Bay-Lynx, Oshkosh, and other manufacturers, listed across drum and volumetric configurations. Each unit comes with detailed photos, hour readings, and inspection reports so you can evaluate drum condition, drivetrain status, and chassis integrity before bidding. If you'd rather see the machine in person, every auction site welcomes pre-sale inspections — contact the yard directly to arrange a walk-around. For related equipment, take a look at our mixer trucks, concrete pump trucks, and concrete batch plants.