The WM90S Whiteman Steel-Drum Plaster/Mortar Mixer series continues the Multiquip tradition of engineering high-performance, jobsite-tough mixers for professional masonry, concrete, and stucco contractors. Featuring a robust 9-cubic foot steel drum, precision paddle system, and the industry's most trusted engine variants, the WM90S delivers unmatched productivity, longevity, and reliability for both demanding contractors and rental fleets.

Product Overview & All Engine Variants

The WM90S mixer handles batch after batch of stiff mortar, grout, or plaster—offering the capacity to mix 2.5 to 3.5 bags (9 cubic feet) at a time. Its heavy-duty, 10-gauge steel drum, 14-gauge steel engine cover, and bull gear-driven drum rotation ensure even mixing and long service intervals, even in aggressive construction environments. The positive drum lock, cast iron paddle arms with rubber blades, OSHA/ANSI compliant safety grate with bag cutter, and a wide chute for easy pours combine to make this mixer a favorite on jobsites everywhere.

The WM90S series offers a power solution for every site:

• WM90SE: 3 HP Baldor 230V, single-phase electric—quiet, eco-friendly, excellent for indoor or emission-sensitive projects.

• WM90SH8: 7.1 HP Honda GX240 gasoline—the preferred high-output gas variant for tough mixes and remote sites.

• WM90SLF: 9 HP MPower 177F-BH gasoline—heavy-duty option for higher torque and power, often specified for rental fleets and high-cycle users.

WM90S Technical Specifications

Premium Engineering & Features

• Double-Sealed, Greasable Bearings: For long life—even in heavy-use, high-moisture masonry conditions.

• High-Strength Paddle Arms: Cast iron with replaceable rubber blades for efficient, thorough mixing and clean drum walls.

• Schedule 80 Removable Tow Bar: Rated for highway speeds, with ball, pin, or loop coupling—quick to remove for site maneuvering.

• OSHA/ANSI Safety System: Robust safety grate and drum lock keep operators safe and projects compliant.

• Seep Hole Seal Design: Alerts for seal wear before bearing damage, minimizing unplanned repairs.

Engine Options: Which Should You Choose?

• Electric (WM90SE): Best for indoor, enclosed, or “green-building” projects—no fumes, quiet operation, plug-and-play productivity.

• Honda GX240 Gas (WM90SH8): Most popular for rugged field use—legendary cold starts, serviceability, and worldwide reliability.

• MPower 9HP Gas (WM90SLF): Heavy-duty, cost-effective, preferred by contractors needing maximum torque and rental houses prioritizing long engine life.

All models are built to the same structural and quality standards, with power options matched to site requirements and material densities.

Core Benefits & Professional Performance

• Consistent Large Batch Mixing: The 9 cf drum swallows full bags and produces perfectly blended, structurally sound mixes—critical for block walls, stonework, stucco, and grout pours.

• Productivity & Savings: Reduce mixing cycles and eliminate hand-mixing labor, keeping masons working efficiently.

• Field-Tested Durability: Exceptionally rugged, from frame to drum and hardware, the WM90S excels in rental and “big build” conditions.

• Easy-Use, Safe Design: Drum lock, bag breaker, and extra-wide pour chute speed workflow and minimize spills and injuries.

• Quick Jobsite Moves: Removable tongue and forklift pockets—just tow, load, or re-stage with virtually any equipment.

Applications

• Large Masonry Projects: Ideal for building walls, columns, and exterior facing with block, brick, or stone.

• Stucco & Plastering: High-volumes keep applicators fed on spread-intensive exteriors and interiors.

• Paving, Tile, & Hardscaping: Big-batch mortar, grout, or bed mixes—matched for plazas, walkways, and pool jobs.

• Rental Fleets: Most rental firms rate the WM90S best for durability, ease of maintenance, and customer satisfaction.

User Reviews & Industry Reputation

• Contractor Favorite: Reviews note “paddle arms never tangle,” “easy to rinse and maintain,” and “runs for years with minimal attention.”

• Rental House Workhorse: High uptime, low parts breakage, and intuitive operation cited as top reasons for repeat investment.

• Excellent Resale Value: Long-running Multiquip and Honda power plants mean used market demand remains high, lowering lifetime cost of ownership.

Maintenance & Best Practices

• Daily drum/paddle rinse and check for buildup (especially with colored or lime-based mortar).

• Watch and clean safety grate and bearings regularly—grease per manual.

• Monitor belt tension and paddle attachment bolts.

• Engine owners: Follow OEM procedures for oil, air filter, and spark plug schedules; run electric units on proper, grounded circuits.

Frequently Asked Questions

Q: Can I mix both mortar and plaster?
A: Yes, the aggressive paddle and drum geometry are designed for both, delivering lump-free, ready-to-use mixes every time.

Q: How many people does it take to move or tow the WM90S?
A: Two people can maneuver it by hand; for long moves, just tow behind a truck, forklift, or lift using the integrated pockets.

Q: Which engine is best for routine use?
A: For outdoors or high-frequency use, Honda and MPower gas are recommended; for indoors and “clean” jobs, use electric.

Q: Can it tolerate rough jobsite use?
A: Yes. Users constantly report years—often decades—of daily service with just seal, paddle, and belt maintenance.

Conclusion

The WM90S Whiteman Steel-Drum Plaster/Mortar Mixer all engine variants stands as the benchmark for efficient, consistent, and heavy-duty mixing for professionals—delivering batch capacity, rugged quality, and unmatched reliability on the construction jobsites where excellence matters most.