PC70-7 PC75UU-2 PC78US-6 Top Roller | OEM Replacement, Part No.20T-30-00050

This heavy-duty carrier top roller is a 1:1 OEM direct replacement for PC70-7, PC75UU-2 and PC78US-6 mini excavators, with standard OEM part number 20T-30-00050. Perfectly matching original mounting dimensions and bolt holes, it requires no cutting, drilling or any on-site modification. It effectively supports track operation, avoids track sagging and vibration, and optimizes undercarriage running performance for long-working mini excavator fleets.

PC70-7, PC75UU-2 and PC78US-6 mini excavators are widely used in municipal renovation, indoor demolition, garden construction and small earthmoving projects. Frequent steering operation, long-term muddy ground contact and continuous gravel friction bring heavy load to undercarriage parts. This matched top roller is professionally designed for mini excavator compact structure and frequent start-stop working mode, keeping stable working performance in various complex working scenarios.

Adopt high-strength one-piece forging steel blank to enhance overall structural stability and impact resistance. Dual standard heat treatment is adopted: integral quenching improves surface hardness for long-term abrasion resistance; tempering eliminates internal metal residual stress to keep complete structural toughness. All mounting holes and matching surfaces are processed by high-precision CNC equipment, with machining tolerance strictly controlled within 0.01mm, fully fitting original factory installation standards.

• Raise the excavator track with a hydraulic jack to separate track from ground and release partial track tension
• Remove fixing bolts of the old top roller, take out damaged roller and clean dust and sediment on the mounting base
• Place the new top roller in original position, align reserved bolt holes accurately
• Lock all fixing bolts with standard torque, reset track tension and conduct track idle running test
• Check no abnormal vibration or friction noise to complete installation

• Universal compatible with three mini excavator models, one spare part meets multiple equipment maintenance needs
• High-precision integral machining realizes seamless fitting, stabilizing track running and reducing walking vibration
• Reinforced floating seal structure isolates external dust and muddy water steadily
• Complete dual heat treatment improves overall durability and extends service cycle
• Direct bolt-on installation saves on-site maintenance time and labor cost

A Southeast Asian equipment rental company owns multiple PC70-7, PC75UU-2 and PC78US-6 mini excavator fleets. After equipped with our OEM-spec top rollers, all undercarriage parts keep stable operation over 1800 working hours with good sealing performance and intact roller shell, cutting annual undercarriage maintenance expenditure by 35%.