Excavator Hydraulic Cylinders

Premium Aftermarket Excavator Hydraulic Cylinders for Mining & Construction

SEIGO Machinery engineers direct-replacement excavator hydraulic cylinders that meet or exceed OEM specifications for heavy-duty mining and large construction equipment. We specialize in the ultra-class machines that keep mines running — supplying boom, arm, bucket and specialty cylinders built to survive the highest-impact excavation environments on earth.

Our Product Range

A complete range of actuators covering every function of your excavator’s hydraulic cycle:

• Boom Cylinders — reinforced structural cylinders for heavy lifting and stability.
• Arm / Stick Cylinders — high-velocity actuators for maximum digging force and crowding action.
• Bucket Cylinders — optimized for breakout force, rapid curling and high-impact resistance.
• Specialty Cylinders — Clam Shell cylinders for loading shovels, Leveling cylinders, and Suspension cylinders for off-highway trucks.

Compatible Brands & Series

We manufacture and stock replacement cylinders for the world’s leading mining and heavy-construction excavators:

Why Choose SEIGO Cylinders?

Unlike generic replacements, every SEIGO cylinder is built “Mining-Ready”:

• Material excellence — 42CrMo4 induction-hardened piston rods resist rock impact and scoring.
• Superior sealing — NOK or Parker seal kits (Japan / USA origin) for zero leakage from −40 °C to +100 °C.
• Rigorous testing — 100% pressure-tested at 1.5× operating pressure before shipment.
• Warranty — backed by a 12-month / 2,000-hour warranty.

Whether you need a single cylinder for a repair job or a bulk order for fleet maintenance, SEIGO keeps your machines working and your downtime low.