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Circle Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

The circle in a motor grader is a precisely machined circular component that serves as the mounting platform for the moldboard blade. It rotates on a vertical axis to adjust blade angle, enabling precise grading, sloping, and material distribution. This component transfers hydraulic power into controlled rotational movement while maintaining structural integrity under heavy loads.

Working Principle

The circle operates through a hydraulic motor-driven gear mechanism that engages with teeth on its circumference. Hydraulic pressure creates rotational torque, allowing the circle to turn the attached blade to desired angles (typically 0-90°). Precision bearings support the circle's rotation while maintaining alignment with the grader frame.

Materials

High-strength alloy steel (ASTM A572 Grade 50 or equivalent), heat-treated to 35-40 HRC hardness, with corrosion-resistant coating (zinc plating or powder coating).

Technical Parameters

Weight 150-300 kg
Diameter 1200-1800 mm
Thickness 25-40 mm
Gear Teeth 120-180 teeth
Load Capacity 15-30 tons
Rotation Speed 2-5 RPM
Operating Pressure 150-250 bar

Standards

ISO 8525, DIN 15061, SAE J1179

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Circle.

Parent Products

This component is used in the following industrial products

Motor Grader

A heavy-duty construction machine with a long blade used to create flat surfaces.

View Product Details

Engineering Analysis

Risks & Mitigation

Gear tooth wear leading to imprecise blade positioning
Structural fatigue cracks from cyclic loading
Bearing failure causing rotation instability
Corrosion in harsh environments

FMEA Triads

Trigger: Inadequate lubrication
Failure: Increased friction and premature gear wear
Mitigation: Implement automated lubrication systems with pressure monitoring

Trigger: Overloading beyond design capacity
Failure: Structural deformation or cracking
Mitigation: Install load sensors with automatic operation limits

Trigger: Environmental contamination
Failure: Bearing seizure and rotation failure
Mitigation: Use sealed bearing assemblies with regular cleaning protocols

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±0.5 mm diameter tolerance, ±0.1° angular positioning accuracy

Test Method

Dimensional verification with laser scanning, load testing at 150% rated capacity, rotational accuracy testing with theodolite measurement

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of the circle in a motor grader?

The circle provides rotational movement to the moldboard blade, allowing operators to adjust cutting angles for precise grading operations.

How often should the circle be inspected?

Perform visual inspections every 250 operating hours and complete dimensional checks every 1000 hours to ensure gear tooth integrity and proper lubrication.

Can circles be repaired or must they be replaced?

Minor gear tooth damage can be repaired through welding and machining, but severe wear or structural cracks requires complete replacement.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Circle