Description
OEM-Quality Hitachi EX1900-6 Hydraulic Stick (Arm) Cylinders
Maximize arm crowd force, dig cycle efficiency, and hydraulic response in harsh pit operations with high-durability Hitachi EX1900-6 Hydraulic Stick Cylinders. Engineered specifically for Hitachi EX1900-6 and EX1900-6E (190-tonne operating weight class) hydraulic excavators and Litronic-style front shovels, these dual double-acting hydraulic rams drive the arm crowd kinematics, penetrating hard rock banks and dense overburden.
Built to sustain continuous hydraulic working pressures of 29.4 MPa (300 bar) and withstand severe high-pressure pressure spikes, each cylinder features precision-honed seamless barrels, heavy-duty chrome plating, and integrated end-position stroke cushioning to prevent mechanical impact damage at full extension and retraction.
Key Features & Benefits
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Heavy-Wall Seamless Forged Steel Barrel: Precision-honed internally to mirror finishes to eliminate oil bypass, lower seal friction, and prevent pressure decay during deep arm crowding cycles.
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Induction-Hardened Hard Chrome Piston Rod: High-yield alloy steel rod treated with induction hardening and thick industrial chrome plating to resist bending, stone pitting, and abrasive scoring.
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Multi-Stage High-Pressure Seal Package: Polyurethane U-cup main pressure seals paired with heavy-duty metal-cased wiper rings retain high hydraulic pressures while excluding dirt, silica, and bench dust.
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Integrated Hydraulic Cushioning Valves: Deceleration cushioning mechanisms at stroke limits smoothly decelerate piston movement, absorbing kinetic energy and protecting boom-arm pin connections.
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Spherical Bearing Eye Ends: Precision-bored spherical plain bearings with dust wipe seals isolate the piston rod and cylinder base from side loads and alignment flex during offset digging.
Verified Technical Specifications
| Parameter | Specification |
| Compatible Machine Models | Hitachi EX1900-6 / EX1900-6E / EX1900-5 |
| Machine Operating Weight Class | 191,000 – 192,000 kg (421,000 – 423,000 lbs) |
| System Hydraulic Working Pressure | 29.4 MPa (300 bar / 4,260 psi) |
| Quantity Installed per Machine | 2 Stick (Arm) Cylinders per Backhoe / Front Shovel |
| Backhoe Arm Crowd Breakout Force | 626 kN (140,730 lbf) |
| Piston Rod Metallurgy | High-Yield Alloy Steel, Induction-Hardened & Chrome Plated |
| Mounting End Fitment | Precision Spherical Plain Bearings with Dust Seals |
| Application | Attachment Kinematics – Arm Crowd, Digging & Bench Penetration |
