YM-420 Heavy-Duty Dust-Free Concrete Floor Grinder with Dual Built-In Vacuum
- Dual Built-In Japanese Vacuum Motors
- Powerful 7.5 kW Grinding Motor
- Variable Speed from 0 to 1,000 RPM
- Bush-Hammer Roughening for Polyurethane Mortar Floors
- CE Certified Quality Supports Global Market Compliance
Home >> Products >> Floor Grinders >> Wholesale YM-420 Industrial Dust-Free Concrete Floor Grinder with Dual Built-In Vacuum
YM-420 Industrial Dust-Free Concrete Floor Grinder Factory with Dual Built-In Vacuum
- Dual Built-In Japanese Vacuum Motors
- Integrated Grinding and Dust Collection
- 7.5 kW Heavy-Duty Grinding System
- Variable Speed up to 1,000 RPM
- 31 L High-Capacity Dust Box
- Polyurethane Mortar Roughening Capability
- Three-Phase Industrial Power Options
Product Description
The YM-420 Heavy-Duty Dust-Free Concrete Floor Grinder is designed for contractors who need strong grinding performance and effective dust collection in one mobile machine. Its 10 hp / 7.5 kW grinding motor and matching inverter provide adjustable tool speed from 0 to 1,000 RPM, helping operators adapt the machine to rough grinding, fine surface preparation, coating removal and polishing.
Unlike conventional floor grinders that must be connected to a separate dust extractor, the YM-420 incorporates two Japanese vacuum motors, a 1.7 m² filtration surface and a 31 L dust-collection box. The vacuum system captures dust close to the grinding head, simplifying equipment setup and reducing the hoses and machines that must be moved around the worksite.
The 16 in / 400 mm grinding width provides a practical balance between productivity and maneuverability. At approximately 210 kg, the machine applies stable grinding pressure for demanding work on concrete, epoxy, hardener, carborundum and other industrial floor surfaces.
Variable Speed for Rough Grinding, Preparation and Polishing
The 7.5 kW inverter allows the tool-holder speed to be adjusted up to 1,000 RPM. This gives operators greater control when changing between aggressive removal, surface profiling, general grinding and finer finishing work.
Adjustable speed helps match machine performance to:
- Concrete hardness
- Coating type and thickness
- Diamond bond and grit
- Tool configuration
- Required removal rate
- Desired concrete surface profile
- Rough or fine grinding stages
- Polishing requirements
The correct speed depends on the installed tooling and floor condition. Operators should begin with a test area and adjust the machine gradually to achieve the required result.
Integrated Dual Vacuum for Cleaner Dry Grinding
Two built-in vacuum motors generate a listed maximum airflow of 5.2 m³/min. Dust is drawn from the grinding head into the integrated filtration and collection system, eliminating the routine need to pull a separate dust extractor behind the grinder.
This integrated design can help:
- Capture concrete and coating dust close to its source
- Improve visibility around the grinding path
- Reduce dust deposited on the prepared surface
- Simplify movement around columns and equipment
- Reduce external hoses and power connections
- Shorten setup and post-grinding cleanup time
- Improve efficiency during indoor dry grinding
“Dust-free” describes the machine’s dust-control design and does not mean that every application produces zero airborne dust. Suitable personal protective equipment, ventilation and local silica-dust procedures remain necessary.
Purpose-Built for Polyurethane Mortar Floor Preparation
When fitted with a compatible bush-hammer or needle-type roughening tool, the YM-420 can prepare concrete substrates before installing polyurethane mortar flooring.
The tooling creates a consistent textured profile that increases the effective contact area between the concrete substrate and the new flooring system. Correct roughening can improve mechanical adhesion and help reduce the risk of weak bonding, hollow areas and later delamination.
The required profile should be determined by the polyurethane mortar manufacturer, project specification and actual condition of the substrate.
Multi-Purpose Surface Preparation
With correctly selected diamond tools, the YM-420 can be configured for:
- Concrete surface grinding
- Epoxy coating removal
- Concrete hardener floor treatment
- Carborundum and emery floor grinding
- Surface profiling before recoating
- Polyurethane mortar substrate preparation
- Laitance and weak-layer removal
- Concrete high-point reduction
- Adhesive and paint removal
- Industrial floor renovation
- Aggregate exposure
- Floor polishing and refinement
Features
Dual Built-In Japanese Vacuum Motors
The YM-420 uses two integrated vacuum motors to maintain strong dust collection during dry grinding. The Japanese motors are selected for resistance to high operating temperatures and voltage fluctuations, supporting dependable performance in demanding construction environments.
Integrated Grinding and Dust Collection
The grinder, vacuum motors, filter and dust container are combined in one machine. This self-contained arrangement reduces reliance on an external dust extractor and makes the YM-420 easier to move through factories, warehouses and commercial renovation projects.
7.5 kW Heavy-Duty Grinding System
A 10 hp / 7.5 kW main motor delivers the power needed for intensive concrete grinding, coating removal and surface preparation. The machine is suitable for large-area and high-intensity projects where smaller compact grinders may require more passes.
Variable Speed up to 1,000 RPM
The matching 7.5 kW inverter provides adjustable tool-holder speed from 0 to 1,000 RPM. Operators can adapt the rotational speed to different diamond tools, floor hardness levels, removal requirements and finishing stages.
400 mm Professional Working Width
The 16 in / 400 mm working width increases coverage while keeping the machine more maneuverable than large-format planetary grinders. It is suitable for open floor areas as well as work around columns, equipment and other fixed structures.
31 L High-Capacity Dust Box
The integrated 31 L dust box provides more collection capacity for high-dust applications. Its larger volume can reduce the frequency of emptying during continuous grinding, although the container should always be checked before it becomes overfilled.
1.7 m² High-Efficiency Filter Surface
A listed filtration surface of 18 ft² / 1.7 m² helps maintain airflow while capturing fine grinding dust. Regular filter inspection and cleaning are important for preserving suction performance and protecting the vacuum motors.
Polyurethane Mortar Roughening Capability
Compatible bush-hammer or needle-type tooling enables the YM-420 to create a uniform textured profile before polyurethane mortar installation. This mechanical preparation increases surface area and supports stronger bonding between the new flooring system and the substrate.
LED Work Light
A front-mounted LED light improves visibility around the grinding path in warehouses, basements and other dimly lit working environments. Better visibility helps the operator identify untreated areas and maintain a more consistent grinding pattern.
Stable 210 kg Machine Construction
The machine weighs approximately 463 lb / 210 kg. This substantial weight supports stable tool contact and consistent grinding pressure during aggressive concrete preparation and coating-removal applications.
Multi-Surface Tool Compatibility
The YM-420 can be equipped with different tools for concrete grinding, coating removal, bush-hammering and polishing. This allows one machine platform to support several stages of a floor-preparation project.
Three-Phase Industrial Power Options
The grinder can be configured for three-phase 220–380 V power, with a 400–480 V high-voltage version also listed. Voltage, frequency, amperage and industrial plug type must be confirmed before production.
Technical Data Table
YM-420 Concrete Floor Grinder Specifications
| Technical Parameter | YM-420 Specification |
| Model | YM-420 |
| Product Type | Heavy-duty variable-speed concrete floor grinder with dual integrated vacuum |
| Grinder Motor Power | 10 hp / 7.5 kW |
| Inverter Power | 7.5 kW |
| Standard Grinder Voltage | Three-phase, 220–380 V |
| Frequency | 50–60 Hz |
| Maximum Grinder Amperage | 29.7 A / 17.2 A |
| High-Voltage Version | Three-phase, 400–480 V |
| Tool-Holder Speed | 0–1,000 RPM |
| Working Width | 16 in / 400 mm |
| Machine Weight | 463 lb / 210 kg |
| Vacuum Configuration | Dual built-in vacuum motors |
| Listed Total Vacuum Power | 2.6 hp / 2 kW |
| Vacuum Voltage | Single-phase, 220 V |
| Maximum Vacuum Amperage | 10 A |
| Filter Surface | 18 ft² / 1.7 m² |
| Maximum Airflow | 5.2 m³/min |
| Dust-Collection Capacity | 31 L |
| Machine Dimensions | 66 × 21 × 41 in |
| Metric Dimensions | 170 × 54 × 105 cm |
| Integrated LED Light | Yes |
| Recommended Operation | Dry grinding with integrated dust collection |
| Primary Advantage | Heavy-duty grinding with dual onboard vacuum motors |
| Main Applications | Concrete grinding, coating removal, profiling, roughening and polishing |
Specification note: The listed 2 kW vacuum rating is presented as the total vacuum-system power. Electrical configuration, voltage, amperage, plug type and internal power arrangement should be confirmed for each order.
Actual performance depends on the concrete hardness, coating condition, diamond tooling, grinding pressure, selected speed, filter condition and required surface profile.
Diamond Tools
Selecting the correct tooling is essential for achieving the required removal rate, surface profile and finish. Exceptional Grinder can provide tool recommendations based on the concrete hardness, existing coating and project objective.
Metal-Bond Diamond Grinding Tools
Metal-bond diamond tools can be supplied for:
- Opening dense concrete surfaces
- Removing laitance and weak surface material
- Reducing high spots
- General concrete leveling
- Exposing aggregate
- Preparing floors before epoxy or polyurethane coating
- Grinding hardener and carborundum floors
Bond hardness should be selected according to the substrate. Soft or abrasive concrete generally requires a harder bond, while hard concrete normally requires a softer bond that exposes fresh diamond more readily.
PCD Coating-Removal Tools
PCD and other aggressive removal tools may be recommended for:
- Thick epoxy coatings
- Polyurethane coatings
- Paint
- Adhesive residue
- Resinous flooring
- Elastomeric or sticky materials
- Heavy surface contamination
The tool configuration should be confirmed according to the coating’s thickness, hardness and adhesion.
Bush-Hammer and Needle-Type Roughening Tools
Bush-hammer or needle-type wheels can create a textured concrete profile for polyurethane mortar, repair mortar and other bonded flooring systems. They may also be used for exposing aggregate, removing weak surface layers and creating decorative textured finishes.
Tool selection should be based on the required surface profile rather than roughening the substrate as aggressively as possible.
Diamond Polishing Tools
Compatible transitional and resin-bond tools may be used for scratch refinement and polishing stages after initial grinding. The complete polishing sequence depends on the concrete condition, aggregate exposure and required gloss level.
Grit Selection Guide
- Extra coarse: aggressive coating or surface removal
- Coarse: concrete opening and high-point reduction
- Medium: general grinding and scratch refinement
- Fine: preparation for polishing or a smoother finish
- Polishing grits: progressive refinement to the specified finish
Information Needed for Tool Selection
Please provide:
- Floor material
- Concrete hardness
- Existing coating type
- Coating thickness
- Total project area
- Required removal depth
- Desired surface profile
- Polyurethane mortar manufacturer’s preparation requirement
- Dry or wet working method
- Required final finish
Accessories
Standard and optional equipment may include:
- Metal-bond diamond grinding tools
- PCD coating-removal tools
- Bush-hammer grinding wheels
- Needle-type roughening tools
- Transitional polishing tools
- Resin-bond polishing pads
- Tool-holder plates
- Grinding-head fasteners
- Dust-shroud components
- Replacement filter elements
- Vacuum motor components
- Internal vacuum hoses and connectors
- 31 L dust-collection box components
- Drive belts
- Shock-absorbing components
- Wheels and bearings
- LED light components
- Inverter and electrical components
- Leakage-protection components
- Three-phase power cables
- Market-specific industrial plugs
- Operating manual
- Maintenance tool kit
The exact standard package and optional accessories should be confirmed in the quotation.
Recommended Spare-Parts Package
Contractors, distributors and rental companies should consider keeping:
- Additional diamond-tool sets
- Replacement filters
- Grinding-head fasteners
- Dust-shroud components
- Vacuum hoses and seals
- Drive belts
- Electrical switches and contactors
- LED light components
- Wheels and bearings
- Voltage-specific plugs and connectors
- Routine vacuum-system service parts
The recommended quantity depends on the number of machines, expected working hours and local spare-parts delivery time.
Support
Exceptional Grinder provides technical assistance for machine configuration, tooling selection, operation and maintenance.
Support is available for:
- Destination-market voltage selection
- Three-phase power and plug configuration
- Variable-speed operating guidance
- Concrete hardness and diamond-bond selection
- Coating-removal tool selection
- Bush-hammer and needle-tool selection
- Polyurethane mortar substrate preparation
- Grinding-head installation
- Filter inspection and cleaning
- Vacuum-system troubleshooting
- Dust leakage diagnosis
- Uneven grinding and vibration diagnosis
- Inverter and electrical component identification
- Preventive maintenance planning
- Replacement-parts supply
- Distributor and rental-fleet support
For faster technical assistance, provide:
- Machine model and serial number
- Voltage, phase and frequency
- Installed tool type and grit
- Selected operating speed
- Concrete or floor material
- Coating type and thickness
- Required surface profile
- Photographs of the grinding head
- Photographs of the prepared floor
- A short video showing the issue
Choosing Between the YM-420 and Compact YM Grinders
Choose the YM-420 when the project requires:
- More grinding power for demanding floor preparation
- A wider 400 mm grinding path
- Dual integrated vacuum motors
- A larger 31 L dust box
- Heavy-duty coating removal or roughening
- Polyurethane mortar substrate preparation
- Large-area commercial or industrial operation
For smaller indoor projects and restricted spaces, consider the YM-320V Variable-Speed Concrete Floor Grinder.
For industrial sites requiring a compact fixed-speed three-phase machine, view the YM-320D Three-Phase Concrete Floor Grinder.