Sumitomo SH120-2 Final Drive Track Travel Motor
The Sumitomo SH120-2 Final Drive Track Travel Motor is a travel drive assembly for compatible excavators. It is designed for the SH120-2 model and mounts on the undercarriage. The assembly combines a hydraulic motor, planetary gear reducer and brake. It converts hydraulic power into controlled track movement. This allows the machine to travel, turn and position on the job site.
Travel Drive Operation
Hydraulic oil flows from the travel control valve to the motor. The motor turns the input shaft of the planetary reducer. The reducer lowers speed and increases torque. The output shaft drives the sprocket, which engages the track chain. The brake holds the machine when travel is not commanded. The final drive must handle machine weight, track tension and digging forces.
Design and Construction
The final drive uses high strength gears and bearings. The housing protects internal parts from impact and contamination. Seals retain hydraulic oil and prevent dirt entry. The motor section is designed for pressure and flow requirements of the SH120-2. The mounting flange and shaft match the undercarriage. Correct fit helps maintain alignment and reduce wear.
Applications
The assembly is used in Sumitomo SH120-2 excavators and related machines. It supports travel on construction sites, roads, mud and uneven ground. It is used in digging, lifting, trenching and loading. The final drive can be used in repair, overhaul or replacement of a failed unit.
Installation Notes
Installation should follow the machine service manual. The machine must be supported safely before removing the final drive. Hydraulic lines should be clean and capped. The mounting surface should be flat and free from damage. Bolts should be tightened evenly and to the correct torque. After installation, fill and bleed the hydraulic system. Check for leaks and verify travel direction.
Maintenance
Regular maintenance includes checking oil quality, filters, leaks, noise and temperature. Track tension should be adjusted according to the manual. Worn seals and bearings should be replaced. The final drive should be operated within its rated pressure and speed. Following the service schedule helps prevent unexpected downtime.
Conclusion
The Sumitomo SH120-2 Final Drive Track Travel Motor is a reliable undercarriage component for excavator travel. It provides hydraulic drive, speed reduction and braking. Correct installation, clean hydraulics and regular maintenance help ensure long service life.
