Sumitomo SH120 Slew Ring JCB JS130
The Sumitomo SH120 Slew Ring for JCB JS130 is a slewing bearing used in excavator rotation systems. It supports the upper structure and allows it to turn on the undercarriage. The slew ring carries axial, radial and tilting loads. It is a critical component for digging, lifting and positioning work. This type of bearing is used in compatible Sumitomo SH120 and JCB JS130 machines.
Function of a Slew Ring
A slew ring is a large bearing with gear teeth on one ring. The inner or outer ring is mounted to the undercarriage, and the other ring is mounted to the upper structure. The swing motor and gearbox drive the gear teeth to rotate the upper structure. The bearing must support the weight of the cab, boom, arm and bucket, as well as digging forces. Smooth rotation and accurate positioning depend on the slew ring condition.
Construction
Slew rings are made from high strength steel. They include rolling elements such as balls or rollers, raceways, seals and a gear tooth profile. Seals help keep dust and water out and retain lubricant. The gear teeth may be internal or external depending on the machine design. The bearing is designed for slow rotation and high load capacity.
Applications
Slew rings are used in excavators, mini excavators, cranes, drilling rigs and other rotating machinery. In excavators, they support trenching, loading, lifting, grading and material handling. The bearing allows the operator to position the bucket accurately and cycle efficiently. It is also used in repair and overhaul of the swing system.
Installation Notes
Installation should be performed with proper lifting equipment and safety procedures. The mounting surfaces should be clean and flat. Bolts should be tightened evenly and to the correct torque. The gear mesh with the swing pinion should be checked. After installation, the bearing should be lubricated according to the machine manual. Rotation should be smooth without noise or binding.
Maintenance
Regular lubrication is important for slew ring life. Grease should be applied through the fittings according to schedule. Users should check for leaks, loose bolts, tooth wear and abnormal noise. If the bearing develops play or rough rotation, it should be inspected by qualified personnel. Keeping the seal and gear area clean helps prevent contamination.
Conclusion
The Sumitomo SH120 Slew Ring for JCB JS130 is a key component for excavator rotation. It supports heavy loads and provides stable upper structure movement. Correct installation, lubrication and maintenance help ensure reliable performance and long service life.
