WORKMAN II 250 & 350 – Towable 9CF and 12CF Mixers are heavy‑duty, road‑towable barrel‑style multi‑mixers engineered for professional contractors who need to mix and move large batches of concrete, mortar, stucco, and grout efficiently. With 9 cubic foot and 12 cubic foot steel drums, powerful electric or Honda gas power options, and rugged towable frames, they are ideal for high‑production jobsites and rental fleets.

Overview of WORKMAN II 250 & 350 Towable Mixers

The WORKMAN II 250 (9CF) and WORKMAN II 350 (12CF) are IMER’s flagship towable steel drum multi‑mixers, often described as some of the most advanced barrel‑style mixers available. They are designed to mix perfect mortar, stucco, grout, or concrete while being easy to tow, position, and operate on busy jobsites.

Both models use a one‑piece removable steel drum, belt‑driven gearbox, worm drive dump mechanism, and a “posi‑lock” drum positioning system, which together provide smooth mixing, controlled dumping, and reduced maintenance compared to mixers with large external crown gears. IMER’s patented interior drum design improves mixing action so materials blend quickly and evenly.

Key Specifications: WORKMAN II 250 vs 350

The main difference between the WORKMAN II 250 and WORKMAN II 350 is drum capacity and batch output, but they share many core features and components.

Capacity and dimensions

Both mixers feature 20 inch pneumatic wheels, discharge outlet height in the mid‑20 inch range (around 26–28 inches), forklift pockets, and a commercial‑duty tow hitch for easy handling and road transport.

Power options

WORKMAN II 250 & 350 – Towable 9CF and 12CF Mixer models are available with either electric motors or gas engines.

• Electric versions:

  • 1.5 HP, 110/220V single‑phase dual‑voltage motors.

  • Ideal for indoor or low‑emission jobsites with reliable power.

• Gas versions:

  • 5.5 HP Honda GX gasoline engines.

  • Perfect for remote sites, high‑production pours, and locations without electrical access.

This flexibility lets contractors choose the configuration that best fits their typical projects and power availability.

Towable Barrel‑Style Design and Mobility

WORKMAN II 250 & 350 are built as road‑towable mixers, with heavy‑gauge steel frames, 20 inch pneumatic wheels, and a towbar/hitch assembly rated for transportation up to typical road speeds when configured appropriately. The frame‑mounted spare tire is standard equipment, ensuring uptime even if a tire problem occurs on the way to or from a job.

Key mobility features include:

• Commercial‑duty tow hitch for secure towing behind trucks or vans.

• 20" pneumatic wheels for better ride and stability on and off road.

• Forklift pockets for quick loading/unloading with equipment on large projects or in rental yards.

Because these mixers are towable, crews can move them from job to job without a trailer dedicated solely to the mixer, improving logistics and reducing setup time.

One‑Piece Removable Drum and Patented Interior Design

Both the WORKMAN II 250 & 350 mixers use a one‑piece removable steel drum that can be taken off the frame when needed, simplifying replacement and deep cleaning. Unlike older “crown gear” mixers, the Workman drum has no large external gear ring, making the assembly lighter, easier to balance, and less prone to damage.

Inside the drum, a patented interior design with aggressive paddles is engineered to mix everything fast, from concrete with coarse aggregate to mortar and stucco. This internal geometry improves circulation, reduces dead zones, and produces a consistent mix in fewer revolutions, enhancing productivity.

Batch capacities of 6 cu ft on the 250 and about 9–9.5 cu ft on the 350 allow the mixers to handle up to roughly 10 and 15 80‑lb bags of material per load respectively, depending on mix design.

Belt‑Driven Gearbox and Worm Drive Dump System

WORKMAN II 250 & 350 – Towable 9CF and 12CF Mixers use a belt‑driven gearbox and worm drive dump mechanism instead of external crown gears.

• Belt‑driven gearbox:

  • Provides quiet, powerful torque from the motor or engine to the drum.

  • Helps reduce noise and vibration.

• Worm drive dump gear:

  • Allows the operator to easily tilt and discharge the drum under full load.

  • Offers mechanical advantage for controlled, safe dumping.

A “posi‑lock” system lets the operator stop and lock the drum in virtually any position, giving fine control over discharge rate and direction. This is especially useful when filling wheelbarrows, forms, or tubs without spilling.

Because there is no large crown gear, maintenance and cleaning are greatly simplified, and the risk of gear tooth damage from impact or buildup is reduced.

Mixing Performance and Materials

WORKMAN II 250 & 350 mixers are true multi‑mixers intended for professional‑grade mixing of a wide range of materials:

• Concrete for slabs, foundations, sidewalks, driveways, and flatwork.

• Mortar for block, brick, stone, and masonry walls.

• Stucco and plaster for exterior and interior finishes.

• Grout and fill materials for masonry cells and structural pours.

IMER’s application chart positions the Workman 250 and 350 as the preferred choice for large mortar and stucco batches (400–800 lbs or more), and for larger scale concrete projects where smaller mixers are too slow. With batch capacities of 6 cu ft and 9.5 cu ft, these units can keep multiple masons or finishers supplied continuously when used with an efficient loading routine.

Typical Use Cases for WORKMAN II 250 & 350

The WORKMAN II 250 & 350 – Towable 9CF and 12CF Mixer models are widely used in:

• Commercial and residential foundations and slabs requiring repeated large batches.

• Masonry projects with high mortar demand, such as CMU walls, structural brick, and stone veneers.

• Stucco and EIFS jobs on multi‑story buildings where continuous large batches are needed.

• Rental fleets supplying contractors and serious DIYers with reliable, easy‑to‑tow mixers.

Contractors often choose the 250 (9CF) for medium to large work where maneuverability and slightly lower weight are important, and the 350 (12CF) for maximum production on large‑scale jobs.

Durability, Maintenance, and IMER Quality

IMER’s WORKMAN II 250 & 350 mixers are built around extremely rigid, MIG‑welded bar steel frames designed for long service life in harsh conditions. The steel drums, heavy‑duty chassis, and industrial‑grade components are selected for durability, while the removable drum and simplified drive layout reduce long‑term maintenance.

Routine maintenance generally includes:

• Checking and adjusting belt tension as needed.

• Inspecting the worm drive dump gear and posi‑lock mechanism.

• Lubricating moving parts according to the manual.

• Cleaning the drum and paddles after each use to prevent buildup and imbalance.

IMER USA provides detailed manuals and parts support for both Workman II 250 and 350 models, and many dealers carry replacement drums, paddles, motors, and Honda engine parts to keep these mixers operating for years.

Why Choose WORKMAN II 250 & 350 – Towable 9CF and 12CF Mixer?

WORKMAN II 250 & 350 – Towable 9CF and 12CF Mixers are excellent choices for contractors who need high‑capacity, road‑towable mixers that are easy to use, easy to maintain, and built for the long haul. With one‑piece removable drums, belt‑driven gearboxes, worm drive dump systems, posi‑lock drum control, and powerful electric or Honda gas options, they deliver the performance and reliability demanded on professional jobsites.

For large mortar, stucco, grout, and concrete projects where productivity and durability are critical, the WORKMAN II 250 & 350 stand out as proven, contractor‑favorite towable mixers that can help keep crews productive and projects on schedule.