How It Works
Polyurethane Star Rotors
Our poly-stars are made from a proprietary polyurethane blend developed to maximise flexibility without compromising on strength. This material has been extensively tested and proven to offer excellent resistance to wear, even in demanding conditions. This flexibility also provides additional protection for the driveline.
The stars rotate in an upwards direction, creating a rolling action inside the bucket. Unlike steel shaft screening buckets, they do not pull material through the rotors. This rolling action breaks apart large clumps of material without crushing or shredding and causes undersize material to fall through the gaps in the rotors.
Carbon Belt Driveline and Hydraulics
Gyru-Star screening buckets are driven by self-tensioning carbon belt drives. These belts offer quieter operation and a far longer service life than chain driven systems yet require zero lubrication. All hydraulic components are mounted internally within the bucket’s protective shell, keeping them safe from impact damage and environmental exposure. The system is engineered to maintain perfect tension and pressure, ensuring smooth rotor movement and consistent screening performance, even in demanding applications or when used with tiltrotators.
How Do Gyru-Star Screening Buckets Work?
Gyru-Star screening buckets are purpose-built for operators who demand high performance, low maintenance, and total reliability across a range of applications and materials. Every design element has been meticulously developed to optimise durability, minimise wear, and deliver fast, efficient and non-destructive screening in all conditions.
Multi-Layer Monocoque Shell
The multi-layer monocoque shell provides unmatched strength and durability while keeping weight to a minimum. The shell is reinforced with HB400 wear-resistant plate and features a stainless steel non-stick floor for additional strength and all-weather performance. All shells are powder coated for long-lasting durability and corrosion resistance.
Stainless Steel Floor
A stainless steel non-stick floor comes as standard across the entire Gyru-Star range. This critical feature ensures that wet, sticky or compacted materials don’t clog the base of the bucket, which would otherwise lead to blockages, slower operation, and unnecessary downtime. The stainless steel surface reduces material adhesion and enables a consistent flow of soil, compost, sand or aggregates into the rotors. As well as improving performance in wet weather and with high-moisture content materials, it adds another layer of strength and corrosion resistance to the shell structure.
HB400 Reinforcement
In high-wear areas, such as the bucket’s cutting edge and critical contact points, we use HB400 wear-resistant plate—renowned for its hardness, toughness and long-lasting performance. This ensures that the bucket can maintain its edge even when used to cut into compacted ground or handle abrasive materials like crushed stone, demolition waste or recycled aggregates. The HB400 reinforcement improves the bucket’s lifespan while reducing the need for repairs or replacement components over time.
Integrated Driveline Housing
To protect the hydraulic driveline and maintain optimal weight distribution, each Gyru-Star screening bucket includes a sealed, integrated driveline housing built directly into each end of the shell. This design not only shields internal components from moisture, dust and debris, but also balances the bucket during operation—improving handling and reducing operator fatigue. The sealed cavity enhances reliability and further eliminates the risk of contamination or damage to the internal drive system.