345BL Hydraulic Boom Cylinder 130mm Bore 1480mm Stroke Excavator Spare Parts 129-7828 Aftermarket
This reliable aftermarket hydraulic boom cylinder is designed as a direct replacement part for Komatsu 345BL excavators. As a key hydraulic component of the working assembly, it controls the upward and downward movement of the boom, delivering stable performance for general construction, road renovation, quarry operations and large-scale earthmoving tasks. Every product is manufactured in strict compliance with original OEM standards, featuring identical mounting sizes, pin pitch and hydraulic port layout. Users can finish direct bolt-on installation on site without cutting, welding or any extra modifications.
| Item | Specification |
|---|---|
| Product Name | Hydraulic Boom Cylinder |
| Applicable Model | 345BL |
| OEM Part Number | 129-7828, 1297828 |
| Product Grade | Brand New High-Quality Aftermarket |
| Warranty | 12 months against manufacturing defects |
| MOQ | 1 unit, in stock for immediate shipment |
| QC Standard | ISO9001 certified, full hydraulic pressure and cyclic tests conducted before delivery |
| # | Part No. | Description | Qty |
|---|---|---|---|
| All | 1297828 | CYLINDER & SEAL GROUP-BOOM; (BOOM) | 1 |
| 1 | 3B8489 | FITTING-GREASE; (FAN AND ALTERNATOR DRIVE) | 1 |
| 2 | 9X4598 | SEAL; (OD=130.18mm) | 4 |
| 3 | 2590755 | CYLINDER GROUP-BOOM | 1 |
| 4 | 8T6757 | PLUG; (PIPE) (1/8-27 NPTF THD) | 1 |
| ---- | SEPARATE ILLUSTRATION |
| Spec Item | Data |
|---|---|
| Bore Diameter | 130mm |
| Piston Rod Diameter | 90mm |
| Working Stroke | 1480mm |
| Rated Working Pressure | 31.4MPa |
| Factory Test Pressure | 47.1MPa (1.5 times the rated working pressure) |
| Barrel Material | High-tensile seamless alloy steel with precision inner honing process |
| Piston Rod | 40CrMo heat-treated steel, 28~32μm hard chrome plating, HRC68~72 with excellent wear and anti-deformation capacity |
| Matching Seal Kit PN | 129-7828K |
| Working Temperature | -25℃ ~ +85℃ |
| Structure | Double ear lugs equipped with quenched copper wear bushings, built-in buffer structure to absorb operational impact |
- Dual Part Number Compatibility: Two part numbers are fully interchangeable, perfectly matching the original boom assembly and hydraulic pipelines for steady operation.
- Heavy-Duty Reinforced Structure: Thickened cylinder body and connection lugs are built to withstand long-duration loads and frequent impacts in tough working environments.
- Strict Pre-Delivery Inspection: Each cylinder passes full-stroke cycle test and high-pressure airtight test to effectively prevent internal and external oil leakage.
- Great Cost Performance: It keeps the same durability as genuine parts, helping spare parts dealers and maintenance teams cut procurement costs effectively.
- Multiple Shipping Options: In-stock orders can be dispatched within 3 working days. Choose air freight for urgent needs and sea freight for bulk wholesale to control logistics expenses.
Our factory has devoted itself to producing hydraulic cylinders for Komatsu medium and heavy excavators for over ten years. We supply a complete range of boom, arm and bucket cylinders for 345 series and other mainstream models. All products follow strict quality control systems and are widely exported to aftermarket markets in Africa, Southeast Asia and the Middle East, winning favorable feedback from global clients.
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