The WM120SHHD Whiteman Steel-Drum Plaster/Mortar Mixer is the heavy-duty, high-capacity flagship in Multiquip’s renowned line of mortar and plaster mixers. Specially designed for high-production masonry, stucco, heavy commercial projects, or rental fleets, this workhorse is engineered for the largest jobs—delivering batch consistency, operator safety, and robust reliability with every load. Available in advanced hydraulic drive (and historically mechanical drive) configurations, with Honda gas power as standard, the WM120SHHD sets the industry bar for premium 12-cubic-foot steel-drum mixing.

Product Overview & Design

At the heart of the WM120SHHD is a 12 cubic foot (340 L) 7-gauge steel drum—the largest in the Whiteman series—supported by a rugged powder-coated frame, oversized axle, B78x13 highway tires, and removable Schedule 80 towing tongue. The paddle shaft is a massive 1-1/4" square of hardened steel with double-sealed, spring-loaded, grease-able shaft bearings for continuous, trouble-free mixing and extended life in abrasive, high-volume conditions. Built for mixing 3.5 to 4 bags (88 lbs each) per batch, this model speeds up big project timelines.

Engine & Drive Variants

While past versions included V-belt mechanical drive options, the current WM120SHHD models are focused on hydraulic drive systems, virtually eliminating wear-prone components like external gears, V-belts, and pulleys. This gives the operator unmatched longevity, minimal maintenance, and reliable mixing of even the lowest-slump mortar or stiffer, aggregate-rich compositions.

Engine options:

• Honda GX390, 11–13 HP Gas: The industry’s most reliable large gas mixer engine, with smooth starts, world-class service network, and robust 8.2–11.7 HP (depending on configuration) for high-load, continuous-duty operation.

• Custom Orders/Electric: In select markets or special orders, 3HP Baldor or similar electric drives have shipped. Contact Multiquip or select dealers for availability.

Key drive/power system attributes:

• Hydraulic Dump: Minimizes operator fatigue, accelerates production cycles, and delivers smoother, safer dumping—even on full, heavy loads. Dual controls allow the operator to manage drum rotation and dump position from one work area, reducing risk and labor.

• Built-in Hydraulic Relief: This safety system immediately disengages the mix blades if a foreign object or obstacle jams inside, preserving drive components and preventing damage or safety hazards.

Technical Specifications

Performance, Safety & Longevity Benefits

• Mixes Heavy Loads, Fast: Hydraulic drive and heavy-duty paddles chew through up to 4-bag batches of mortar with less heat, slipping, or downtime than V-belt systems.

• Operator-Centered Efficiency: Dual controls and hydraulic dump minimize lifting or straining, reduce operator risk, and keep cycle times short for higher daily output.

• Virtually Maintenance-Free Mixing: No belts to break, pulleys to adjust, or external gears to lubricate—the powerful sealed systems endure years of daily use with only routine checks and greasing of bearings.

• World-Class Durability: 7-gauge drum, 14-gauge covers, and a heavy, powder-coated steel frame absorb shock, resist corrosion, and survive years on and off the highway.

• Jobsite Safety: Hydraulic relief and drum lock systems immediately protect both machine and crew in a jam, while the full safety grate meets all contemporary OSHA and ANSI construction standards.

Applications

• Large Commercial Masonry: Pour after pour on block/brick projects, multi-story buildings, bridge abutments, and urban restoration—delivering high-quality, large batches rapidly.

• Plaster & Stucco Crews: Keeps multiple applicators supplied on high-rise or multi-wall projects, where interruption means wasted labor and lost finish quality.

• Precast Concrete Shops: Suited for mixing large volumes of grout or wet-setting mixes for forms, curb, flatwork, precast units.

• Rental Fleets & Infrastructure: Hydraulic simplicity, durability, and huge capacity make it a favorite nationwide for large rental operations and DOT/public works jobs.

User Reviews & Industry Voice

• “Unparalleled uptime”: Crews and rental operators consistently cite the WM120SHHD as the heaviest-duty, lowest-maintenance big-batch mixer on the market.

• Best-in-class production: Operators appreciate rapid mix cycles, heavy batch handling, and the fatigue-busting hydraulic dump system.

• Easy to service: Strategic access to grease points, bearings, and controls, plus direct Honda or electric engine servicing, reduces downtime and keeps teams moving.

• Safety merits: Hydraulics-based jam protection and locking grates are popular for both field and shop safety compliance.

Maintenance & Best Practices

• Grease bearings as indicated (typically every 60–100 hours under standard use); check seals at regular intervals.

• Clean drum and paddles after every shift, especially with colored or sticky batches; rinse before switching mixes.

• Inspect hydraulic fluid levels monthly and after any prolonged heavy-duty mixing.

• Check tires, tongue, and drum locks before towing; always verify hydraulic dump function in pre-day checks.

Frequently Asked Questions

Q: Can it run lower-slump or heavy aggregate mixes?
A: Yes—hydraulic drive and extra paddle torque enable it to mix large, stiff, or low-slump batches every time.

Q: Is it suitable for continuous high-production projects?
A: Absolutely. With 12 cf capacity and a fast, operator-friendly dump, it’s perfect for non-stop large jobsite or plant environments.

Q: What’s the most reliable engine option?
A: Honda GX390 gas—long regarded as the premiere engine for high-volume mixing, featuring both smooth running and universal service availability.

Q: How much maintenance vs. older mechanical designs?
A: Far less—hydraulic systems have fewer wear points, tolerate more abuse, and are easier to rebuild or service than belt or gear-driven alternatives.

Conclusion

The WM120SHHD Whiteman Steel-Drum Plaster/Mortar Mixer (all engine variants) leads the market for contractors, plant crews, and rental yards demanding high batch volume, relentless up-time, operator-safe controls, and minimal service interruption. With its robust 12-cubic-foot drum, industry-best hydraulic drive, powerful Honda or electric engines, and safety-forward engineering, the WM120SHHD sets the modern standard for large-scale, professional mixing on every jobsite—from bridges to skyscrapers to stadiums.