Excavator Hydraulic Cylinders

Premium Aftermarket Excavator Hydraulic Cylinders for Mining & Construction

SEIGO Machinery is a leading manufacturer of high-performance hydraulic cylinders designed for the world’s toughest excavation environments. We specialize in engineering and producing direct replacement cylinders that meet or exceed OEM specifications for heavy-duty mining and construction equipment.

Our Product Range: Comprehensive Hydraulic Solutions

We provide a complete range of actuators to cover every function of your excavator’s hydraulic cycle:

• Boom Cylinders: Reinforced structural cylinders designed for heavy lifting and stability.

• Arm / Stick Cylinders: High-velocity actuators engineered for maximum digging force and crowding action.

• Bucket Cylinders: Optimized for breakout force, rapid curling, and high-impact resistance.

• Specialty Applications: Including Clam Shell Cylinders for loading shovels, Leveling Cylinders, and Suspension Cylinders for off-highway trucks.

Compatible Brands & Series

Our manufacturing capabilities cover a wide spectrum of global heavy equipment brands. We stock and manufacture replacement parts compatible with:

• Komatsu: From construction models (PC200, PC300) to ultra-class mining excavators (PC1250, PC2000, PC3000, PC4000).

• Hitachi: Covering the ZAXIS series (ZX330, ZX470, ZX870) and EX mining giants (EX1200, EX1900, EX2500).

• Caterpillar (CAT): Aftermarket solutions for CAT 349, 390, 6015, and D-series Bulldozers.

Why Choose SEIGO Cylinders? (The Quality Difference)

Unlike standard generic replacements, SEIGO cylinders are built “Mining-Ready”:

1. Material Excellence: We use 42CrMo4 induction-hardened piston rods to resist rock impact and scoring.

2. Superior Sealing: Equipped with NOK or Parker seal kits (Japan/USA origin) to ensure zero leakage in extreme temperatures (-40°C to +100°C).

3. Rigorous Testing: Every cylinder undergoes 100% pressure testing at 1.5x operating pressure before shipment.

4. Warranty: Backed by a comprehensive 12-Month / 2000-Hour Warranty.

Whether you need a single replacement cylinder for a repair job or a bulk order for fleet maintenance, SEIGO provides the reliability you need to minimize downtime.