Is a Dual Dozer or Level Best Scraper the Right Fit for Precision Grading

[MikePhua]

The Rise of Precision Grading Attachments
Over the past two decades, precision grading has evolved from a niche capability into a mainstream requirement for contractors working in landscaping, sports field construction, and site preparation. Traditional box blades and manually adjusted scrapers have given way to laser-guided and GPS-integrated systems that allow for millimeter-level accuracy. Two standout solutions in this space are the Dual Dozer and the Level Best scraper—each designed to transform compact equipment into high-precision grading machines.
The Dual Dozer, originally developed as a laser-controlled grading box, gained popularity in the early 2000s for its ability to maintain grade across wide surfaces using dual receivers. Level Best, founded in the 1990s and later acquired by ATI Corporation, focused on building scrapers and grading boxes compatible with skid steers and compact track loaders. Their systems are known for tight tolerances and compatibility with Trimble and Topcon control systems.
Terminology:
- Laser-Controlled Grading Box: An attachment that uses laser receivers to automatically adjust blade height for consistent grade. - Dual Receiver System: A setup with two sensors that allows for automatic blade tilt and elevation control.
Evaluating Site Conditions and Equipment Compatibility
When choosing between a Dual Dozer and a Level Best scraper, site conditions and existing equipment play a critical role. In one scenario, a contractor was working with a 7-foot Dual Dozer equipped with a Trimble GCR system. The challenge was to find a replacement control system without having to swap out solenoids or valve bodies.
Key considerations included:

• Whether the existing hydraulic system could support proportional control
  
• Compatibility with newer laser or GPS receivers
  
• Blade width and maneuverability in tight areas
  
• Soil type and moisture content affecting drag resistance
  

In this case, the contractor was working in the Pacific Northwest, where clay-rich soils and frequent rain create sticky conditions. A wider blade like the Dual Dozer can struggle with material buildup, while the Level Best’s narrower profile and aggressive cutting edge may offer better performance.
Terminology:
- Proportional Control: A hydraulic system that adjusts flow based on input signal strength, allowing smooth blade movement. - Drag Resistance: The force required to pull a blade through soil, influenced by blade width, soil type, and moisture.
Hydraulic Integration and Control System Replacement
Replacing a Trimble GCR system without disturbing the solenoids and valve body requires careful matching of voltage, signal type, and response curve. Some modern systems offer plug-and-play compatibility, while others require rewiring or software calibration. Western States Cat, a dealer known for precision grading expertise, has helped contractors retrofit older grading boxes with newer control modules.
Options for integration include:

• Using a CAN-based controller that interfaces with existing valves
  
• Installing a manual override switch for troubleshooting
  
• Mapping blade response curves to match operator preferences
  
• Adding a slope sensor for dual-axis control
  

In one retrofit project, a contractor used a Topcon laser receiver with a custom-built interface to drive the Dual Dozer’s solenoids. The system was calibrated using a test pad and achieved ±0.25 inch accuracy across a 100-foot run.
Terminology:
- CAN-Based Controller: A device that communicates using the Controller Area Network protocol, common in modern machinery. - Slope Sensor: A device that measures blade angle relative to horizontal, used for maintaining consistent grade on uneven terrain.
Comparing Blade Geometry and Finish Quality
Blade geometry affects not only grading efficiency but also finish quality. The Dual Dozer’s flat blade with side wings is ideal for large pads and parking lots, while the Level Best’s curved blade and floating hitch allow for smoother transitions and fewer ridges. Operators often report that the Level Best leaves a more polished surface, especially when working with sandy or loamy soils.
Comparison summary:

• Dual Dozer: Wide coverage, better for bulk grading, less finesse
  
• Level Best: Narrower, better finish, excels in tight spaces
  
• Dual Dozer with GPS: Ideal for large commercial pads
  
• Level Best with laser: Best for sports fields and landscaping
  

In a 2022 sports complex build in Colorado, a Level Best scraper was used to grade a soccer field to within 3/16 inch tolerance. The contractor credited the floating hitch and dual-axis control for the smooth finish, which passed inspection without additional touch-up.
Terminology:
- Floating Hitch: A pivoting connection that allows the blade to follow ground contours independently of the machine. - Finish Grade: The final surface elevation and smoothness required before turf, concrete, or asphalt installation.
Maintenance and Long-Term Ownership Considerations
Both systems require regular maintenance to perform at peak accuracy. Solenoids should be tested for response time, blade edges inspected for wear, and receivers calibrated monthly. Dust and vibration can degrade sensor performance, so protective housings and vibration dampeners are recommended.
Maintenance checklist:

• Clean and inspect laser receivers weekly
  
• Test solenoid response with diagnostic tools
  
• Grease pivot points and blade hinges
  
• Replace worn cutting edges before they affect grade
  
• Store control modules in climate-controlled environments
  

In one case, a contractor lost grade accuracy due to a cracked receiver housing that allowed moisture intrusion. After replacing the receiver and recalibrating the system, accuracy returned to spec.
Terminology:
- Cutting Edge: The lower edge of the blade that contacts the soil, subject to wear and impact. - Receiver Housing: The protective shell around a laser or GPS receiver, shielding it from weather and vibration.
Conclusion
Choosing between a Dual Dozer and a Level Best scraper depends on the jobsite, existing equipment, and desired finish quality. While both systems offer precision grading capabilities, their strengths lie in different applications. The Dual Dozer excels in wide, open areas with bulk material movement, while the Level Best shines in fine grading and tight contours. With proper integration and maintenance, either system can deliver professional-grade results that meet modern construction standards.