Evaluating the Suihe Skid Steer Box Grader for Budget-Minded Operators

[MikePhua]

The Rise of Imported Grading Attachments
Suihe, a Chinese manufacturer known for producing low-cost construction attachments, has gained traction in North America through auction platforms and wholesale distributors. Their skid steer box grader is marketed as a cost-effective alternative to premium brands like Roadrunner, whose CH series models can exceed $10,000 when equipped with dual hydraulics and bolster wheel kits. In contrast, the Suihe unit often sells for under $1,500, making it attractive to homeowners, small contractors, and landowners seeking basic grading capabilities without a major investment.
However, the affordability comes with trade-offs. Like many offshore attachments, the Suihe grader arrives with minimal documentation, limited customer support, and components that may require modification before reliable use.
Initial Setup and Structural Weaknesses
Upon delivery, the Suihe grader presents a basic frame with hydraulic blade adjustment and skid plates. The front blade is constructed from ¼-inch mild steel, which proved insufficient during first use—it folded under load, halting the operation. This material thickness is more appropriate for cosmetic scraping than structural grading, especially when working with compacted gravel or clay.
The attachment also lacks the industry-standard 3-3-6 bolt pattern used for grader blades, meaning replacement or upgrade requires drilling new holes. This is a critical limitation for users expecting plug-and-play compatibility with aftermarket blades.
Terminology Clarification
- Box Grader: A grading attachment with enclosed sides and adjustable blades for leveling surfaces
- 3-3-6 Bolt Pattern: A standardized mounting configuration for grader blades, using three bolts spaced evenly across six inches
- Hydraulic Manifold: A component that distributes hydraulic fluid to multiple actuators or solenoids
- Skid Plates: Flat surfaces that guide the attachment along the ground and control grading depth
- Bolster Wheel Kit: An optional set of wheels that stabilize the grader and improve finish quality
Modifications for Functional Performance
To make the Suihe grader usable, several modifications were necessary:

• Replacing the front blade with a discarded 72-inch motor grader blade sourced from a salvage yard
  
• Raising the hydraulic mounts by 3 inches to allow the blades to adjust both above and below grade
  
• Rewiring the control harness using aftermarket connectors from Digikey to integrate with the skid steer’s controls
  
• Manually adapting the blade mount to accept standard hardware
  

These changes transformed the attachment from a barely functional tool into a workable grader capable of distributing material evenly. The upgraded blades offered better durability and improved cutting performance, while the hydraulic adjustments allowed for more precise control.
Hydraulic System Challenges
The hydraulic manifold on the Suihe grader uses solenoids labeled Hislo PDCE50-2-G3-8, a designation that appears to have no online documentation. This creates uncertainty for troubleshooting or replacement. Users must rely on visual inspection and trial-and-error wiring to integrate the system, which can be daunting for those unfamiliar with hydraulic electronics.
Despite this, the manifold responded well once rewired, and the blade adjustments operated smoothly under load. However, the lack of support means future repairs may require complete replacement of the manifold or custom fabrication.
Field Use and Practical Outcomes
After modifications, the Suihe grader performed adequately for driveway maintenance and light grading tasks. It was able to cut below grade, lift material, and redistribute gravel with reasonable consistency. While not suitable for commercial grading or heavy-duty site prep, it met the needs of a mechanically inclined homeowner.
One operator described the attachment as “an 80% lower” of the grading world—a reference to unfinished firearm receivers that require user completion. This analogy captures the essence of the Suihe grader: a base platform that demands customization to reach full functionality.
Recommendations for Buyers
Before purchasing a Suihe box grader:

• Expect to modify blade mounts and hydraulic fittings
  
• Source replacement blades in advance from salvage yards or aftermarket suppliers
  
• Be prepared to rewire the control harness using standard connectors
  
• Inspect welds and frame integrity before use
  
• Avoid using the stock front blade for anything beyond loose soil
  

For users with fabrication skills and access to basic tools, the Suihe grader offers a low-cost entry into grading work. For those seeking plug-and-play performance, a domestic brand with full support may be a better long-term investment.
Final Thoughts
The Suihe skid steer box grader is a reminder that price and performance often diverge. While it lacks the polish and durability of premium models, it can be transformed into a functional tool with time, effort, and ingenuity. In a market where equipment costs continue to rise, such budget options fill a niche—provided the buyer understands what they’re getting into. For the right operator, it’s not just a grader—it’s a project worth finishing.