Bulldozers Hydraulic Cylinders

Premium Aftermarket Bulldozer Hydraulic Cylinders for Mining & Construction

SEIGO Machinery manufactures direct-replacement bulldozer hydraulic cylinders that meet or exceed OEM specifications for large and ultra-class dozers. From Caterpillar D10 and D11 mining dozers to Komatsu’s largest crawler machines, we supply blade and ripper cylinders engineered to hold full cutting and ripping loads in the world’s toughest mining and earthmoving operations.

Our Product Range

A complete range of cylinders covering every function of your dozer’s blade and ripper:

• Blade Lift Cylinders — raise and lower the dozer blade under full cutting load.
• Blade Tilt / Pitch Cylinders — tilt and pitch the blade for precise grading, side-cutting and load control.
• Ripper Lift Cylinders — drive the rear ripper through hard rock and compacted ground.
• Ripper Tilt Cylinders — adjust the ripper shank angle for penetration and breakout.
• Cold-Climate (Arctic-Spec) Cylinders — special seal and material packages rated for extreme sub-zero mining operations.

Compatible Brands & Series

We manufacture and custom-supply replacement cylinders for the world’s leading mining and earthmoving dozers:

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, with arctic-spec options for extreme cold.
• 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.