Miejsce pochodzenia:
Chiny
Nazwa handlowa:
Belparts
Orzecznictwo:
CE
Numer modelu:
DX350LC DX350
More Branded Accessories are Available
| Hydraulic Parts | Hydraulic Pump | Final Drive | Travel Reduction |
| Swing Motor | Swing Reduction | Control Valve | Gear Parts |
| Slew Bearing | Engine Assembly | Hydraulic Cylinder | ECU |
Doosan DX350 / DX350LC Boom Hydraulic Cylinder | PN:400309-00085B | Heavy-Duty Aftermarket Replacement
Product Overview
This heavy-duty boom hydraulic cylinder acts as a direct drop-in aftermarket replacement engineered exclusively for Doosan DX350 standard chassis excavator and extended long-track DX350LC heavy digger. Serving as the primary load-bearing lifting component of front working attachments, it sustains heavy boom hoisting, lowering and static load retention during hard rock excavation, large-volume ore haulage, deep foundation digging and major highway earthmoving. It remains a core stocked spare part for heavy machinery overhaul workshops, large-scale excavation rental fleets and cross-border component suppliers focusing on Doosan DX heavy-duty excavator series.
Every production procedure strictly complies with Doosan original OEM engineering blueprints and dimensional specifications. Mount lug center distance, pin hole aperture, copper bushing inner size and hydraulic oil port layout are 100% consistent with part number 400309-00085B. No grinding, cutting or on-site welding rework is required during replacement installation, effectively trimming maintenance labor costs and eliminating long construction shutdown losses caused by machine faults.
Basic Product Information Table
| Item | Detailed Specification |
|---|---|
| Full Product Name | Complete Boom Hydraulic Cylinder Assembly |
| Applicable Excavator | Doosan DX350 Standard Track, DX350LC Long Track Heavy Excavator |
| OEM Reference Part Number | 400309-00085B |
| Product Grade | Mine-strength reinforced aftermarket hydraulic assembly |
| Quality Warranty | 12-month full coverage against all factory manufacturing defects |
| Minimum Order Quantity | 1 unit, abundant spot inventory for instant delivery |
| QC Control Standard | ISO9001 full-process traceable production; 100% high-pressure airtight leak test + full-stroke reciprocating fatigue testing before packing |
Core Technical Parameters
| Technical Index | Standard Value |
|---|---|
| Cylinder Tube Inner Bore | 150 mm |
| Hard Chrome Plated Piston Rod Diameter | 98 mm |
| Effective Working Stroke | 1560 mm |
| Rated System Operating Pressure | 31.4 MPa |
| Factory Hydraulic Proof Test Pressure | 47.1 MPa (1.5 times rated working pressure for comprehensive leak screening) |
| Barrel Raw Material | Ultra-high tensile seamless alloy steel with deep precision inner honing, forming smooth low-friction inner wall resistant to long-hour heavy hydraulic circulation wear |
| Piston Rod Surface Treatment | 40CrMo quenched & tempered substrate, 30–35μm dense hard chrome coating, surface hardness HRC68–72, outstanding scratch resistance and anti-deformation performance under continuous heavy quarry impact loads |
| Matching Special Seal Kit PN | 400309-00085B-KIT |
| Applicable Ambient Temperature Range | -25℃ ~ +85℃ |
| Structural Feature | Extra-thick integrated boom lifting lugs fitted with oversized self-lubricating copper alloy bushings; dual-stage built-in buffer valve to absorb violent shock loads generated during frequent heavy boom lifting and lowering cycles at mining sites |
Unique Product Competitive Advantages
Dual Chassis Universal Compatibility for DX350 & DX350LC Models
This single boom cylinder assembly fits both standard DX350 and long-frame DX350LC without dimensional deviation. All connecting geometries fully match genuine Doosan factory components, enabling seamless docking with original boom linkages and hydraulic pipelines. It completely avoids assembly misalignment issues that lead to premature seal aging and persistent oil leakage from forced installation.
Mine-Optimized Reinforced Anti-Collision Structural Upgrade
Different from general construction hydraulic cylinders, this model thickens cylinder barrel and integrated cast lugs to adapt to harsh quarry operating conditions including long-term alternating heavy loads and frequent hard rock collisions. The reinforced structure delivers far longer service life than thin-wall generic aftermarket cylinders only suitable for light soil excavation scenarios.
Two Independent Offline Pre-Delivery Inspections Eliminate Hidden Defect Risks
Each finished cylinder undergoes two rounds of rigorous factory testing. Full-stroke reciprocating fatigue testing simulates months of uninterrupted heavy mining operations to verify integral structural rigidity; extended high-pressure soaking airtight inspection comprehensively scans all internal and external leakage points. All unqualified products are fully filtered out before warehousing to prevent costly unplanned production halts for mine operators.
Excellent Cost Performance for Large Heavy Equipment Fleet Managers
This aftermarket boom cylinder achieves identical structural toughness, stable running smoothness and service cycle as authentic Doosan OEM spare parts at a much more competitive unit price. It effectively reduces long-term recurring maintenance expenses for mine repair hubs and large rental enterprises managing batches of DX350 series heavy excavators.
Diversified Global Shipping Plans Cater to Varied Client Delivery Demands
All in-stock products can be dispatched within 3 working days upon payment confirmation. Air express channels support emergency rush orders for sudden machine breakdowns in remote quarry areas; consolidated bulk sea cargo and full FCL container shipping provide cost-saving wholesale transport options for machinery distributors covering mining markets across Africa, Southeast Asia, the Middle East and Latin America.
Factory Production Strength Brief
Our manufacturing plant has over 10 years of specialized R&D and mass production experience focused on hydraulic cylinders for Doosan DX series heavy excavators, covering the mainstream DX350 and DX350LC models. We possess complete supporting production lines including heavy precision forging, deep inner honing, integral heat treatment and automatic thick chrome plating, equipped with professional heavy-load simulation test benches to restore real abrasive mining environments and continuously optimize product anti-shock durability. Our mine-grade aftermarket hydraulic cylinder product range is exported worldwide all year round, gaining stable long-term cooperative trust and consistent favorable feedback from global heavy machinery spare parts distributors thanks to precise heavy-model matching and uniform reliable quality output.
Regular Customer FAQ
Q1: Can this boom cylinder fit Doosan DX300LC or DX380LC excavators?
A: Cross-model compatibility is unavailable. Different Doosan heavy excavator models carry exclusive OEM part numbers and unique lug mounting geometric sizes without interchangeability. Please confirm your complete machine model before placing orders.
Q2: Does the standard delivery package include the matching seal repair kit?
A: Standard packaging only contains the full boom cylinder assembly. The dedicated 400309-00085B-KIT seal kit requires separate purchase, and we offer a discounted bundled quotation for clients purchasing cylinder and seal kit together.
Q3: What anti-rust and anti-impact protective measures are used for long-distance ocean transportation?
A: Anti-rust hydraulic oil is fully injected into front and rear cylinder cavities to stop internal corrosion; thick anti-rust grease is evenly coated over the entire exposed piston rod surface. The whole cylinder assembly is wrapped with multi-layer heavy waterproof PE film and fixed inside reinforced thick plywood export crates to avoid scratches, impact deformation and moisture erosion during lengthy cross-ocean transit.
Q4: Will tiered volume discounts apply when purchasing a full boom + arm + bucket cylinder set for DX350 series?
A: Yes. Orders for complete front working device cylinder sets enjoy progressive bulk purchase discounts. Consolidated full-container sea shipping service is also supported to cut overall international logistics costs for large batch orders.
Q5: What after-sales technical support can I get if oil leakage occurs within the 12-month warranty period?
A: Please provide clear photos of the leakage position together with your excavator serial number for verification. We will arrange free replacement sealing accessories and detailed step-by-step remote maintenance operation guidance promptly to resolve leakage faults rapidly without delaying mine production progress.
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