Description
OEM-Quality Hitachi EX1900-6 Heavy-Duty Boom Assembly
Absorb massive digging forces and maintain structural integrity under continuous 24/7 loading cycles with a heavy-duty Hitachi EX1900-6 Main Boom Assembly. Engineered specifically for Hitachi EX1900-6 and EX1900-6E (190-tonne operating weight class) mining excavators and Litronic-style front shovels, this main lift structure connects the upper revolving frame to the stick arm and bucket assembly.
To withstand torsional twisting and cyclic fatigue caused by deep bank digging and heavy overburden handling, the EX1900-6 boom is fabricated using high-tensile steel plates reinforced with internal structural baffles and heavy cast steel fittings at all high-stress pivot joints.
Key Features & Benefits
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Stress-Relieved Welded Box-Section Architecture: Thick, high-strength steel side and top plates are robotically welded and thermal stress-relieved to prevent fatigue cracking under cyclic load surges.
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Precision Cast Steel Joint Fittings: High-stress load points—including the boom foot pivot, boom cylinder rod mounts, and arm tip pin connections—utilize heavy cast steel inserts to distribute stress evenly into the box structure.
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Internal Structural Reinforcement Baffles: Strategically positioned internal steel bulkheads resist torsional twisting when digging off-center or sloped rock faces.
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Line-Bored Pin Bosses with Induction-Hardened Bushings: Factory line-bored pin seats ensure perfect pin alignment, minimizing sleeve wear and joint play during rapid boom elevation cycles.
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Integrated Hydraulic Hardline Guide Mounts: Pre-welded protective brackets securely route high-pressure boom, arm, and bucket oil lines along the top structure, shielding them from fall-rock damage.
Verified Technical Specifications
| Parameter | Backhoe (BE) Configuration | Front Shovel (FS) Configuration |
| Compatible Machine Models | Hitachi EX1900-6 / EX1900-6E / EX1900-5 | Hitachi EX1900-6 / EX1900-6E / EX1900-5 |
| Machine Operating Weight | 192,000 kg (423,287 lbs) | 191,000 kg (421,082 lbs) |
| Boom Nominal Length | 8.30 m (27 ft 3 in) | 5.35 m (17 ft 7 in) |
| Material Composition | High-Tensile Structural Steel Plate + Cast Steel Joint Ends | High-Tensile Structural Steel Plate + Cast Steel Joint Ends |
| Bore Alignment | Precision Line-Bored Foot, Cylinder & Arm Pivot Bores | Precision Line-Bored Foot, Cylinder & Arm Pivot Bores |
| Hydraulic Line Mounts | Integrated Hardline Routing Brackets | Integrated Hardline Routing Brackets |
| Application | Primary Upper Attachment Structure for High-Cycle Mining | Primary Upper Attachment Structure for High-Cycle Mining |
