Extend the working radius of your 52-ton Hyundai excavator with our Long Extended Arm (Long Reach Front), engineered as a custom aftermarket solution for Hyundai HX520L, R520LVS, R520LC-9A, and 520-series excavators. While the standard HX520L is already equipped with a 6,550 mm boom and 2,550 mm arm delivering a max. digging reach of 10,870 mm , our extended arm kit pushes that reach even further — making it the ideal attachment for deep excavation, river dredging, slope finishing, foundation pit digging, and long-reach demolition.
Why Choose a Long Extended Arm for Your Hyundai 520?
The Hyundai 520 platform is a versatile 52-ton class excavator widely used in mining, quarrying, heavy earthmoving, and demolition . The official Hyundai option list for the R520 series already includes long booms of 9.0 m and 10.0 m, plus long arms of 5.85 m and 6.85 m , proving the chassis is fully capable of accepting extended front-end configurations. Our long extended arm kit is purpose-built to unlock that potential — giving your machine a significantly larger working envelope without sacrificing stability.
Key Features & Specifications:
- Designed For: Hyundai HX520L, R520LVS, R520LC-9A, 520-series 52-ton excavators
- Extended Reach: Custom boom + arm combinations available; typical long-reach kits extend max. digging radius well beyond the standard 10,870 mm , reaching 16–18 m or more depending on configuration
- Boom & Arm Options:
- Long boom: 9,000 / 10,000 mm (based on Hyundai OEM options)
- Long arm: 5,850 / 6,850 mm (based on Hyundai OEM options)
- Fully custom lengths manufactured to your job-site requirements
- Material: High-strength Q355 / Q460 low-alloy structural steel; reinforced box-section construction for maximum bending and torsional resistance
- Manufacturing Process: Precision cutting → assembly jig welding → stress relief heat treatment → CNC machining of pin bosses → shot blasting → anti-corrosion primer + polyurethane topcoat
- Reinforced Structure: Internal baffle plates and gusset reinforcements at high-stress zones (boom foot, arm base, cylinder mounts) prevent cracking under continuous heavy load
- Precision Pin Hubs: Machined to OEM tolerances for perfect fitment with your Hyundai 520’s boom foot, arm pivot, and hydraulic cylinder interfaces — no modification required
- Hydraulic Compatibility: Standardized hydraulic piping interfaces; optional piping kits for clam-shell, grapple, breaker, or shear attachments
- Counterweight Option: Optional additional counterweight available to maintain stability with the extended front end (as seen on Hyundai 520 high-reach demolition conversions)
- Color: Hyundai original yellow, or custom color per your brand requirement
- Certification: ISO 9001 certified manufacturing; 100% dimensional inspection before shipment
- Warranty: 12 months against manufacturing defects
Typical Configurations for Hyundai 520 Long Extended Arm:
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Boom Length
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Arm Length
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Max. Digging Reach (Approx.)
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Typical Application
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9,000 mm
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5,850 mm
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16–17 m
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Deep excavation, foundation pit, dredging
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10,000 mm
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6,850 mm
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17–18 m
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River/port dredging, long-distance slope work
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9,000 mm (straight)
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2,700 mm + 9,500 mm dipper
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Up to 27 m pin height
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High-reach demolition (HRD configuration)
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Modular Versatility Inspired by Hyundai’s Own HX520A HRD: Hyundai’s latest 52-ton HX520A HRD demolition excavator uses a modular quick-boom connection system to switch between a conventional earthmoving front, a straight demolition boom, and an ultra-high-reach configuration with up to 27 m pin height and 16 m forward reach . Our long extended arm kit brings that same versatility to your HX520L/R520 — transforming a standard excavator into a multi-mission machine.
Why Choose Our Long Extended Arm?
- Engineered for the 52-Ton Class: Built specifically around the Hyundai 520 chassis geometry, with boom foot and arm pivot dimensions matched to OEM specifications for true plug-and-play installation.
- Extended Working Radius: Dramatically increases your machine’s reach for jobs that standard arms simply can’t handle — dredging deeper channels, digging wider foundation pits, finishing distant slopes, or demolishing taller structures.
- Heavy-Duty Welded Structure: Box-section boom and arm with internal reinforcement plates absorb the bending moments generated by the longer lever arm, preventing fatigue cracks and extending service life.
- OEM-Grade Hydraulic Piping: Pre-installed hydraulic lines with standard quick couplers; compatible with buckets, grapples, breakers, shears, and clamshell attachments.
- Factory-Direct Value: Source straight from our production line — custom-engineered quality at a fraction of the cost of a full OEM long-reach machine.
- Fully Customizable: Tell us your required reach, working depth, and attachment type — we manufacture to your exact specification. OEM/ODM branding and packaging supported.
- One-Stop Attachment Solution: We also supply buckets, rippers, quick couplers, hydraulic breakers, and undercarriage parts for the Hyundai 520 series.
Applications:
- River & Port Dredging: Long reach for cleaning river beds, harbor basins, and sediment removal
- Foundation Pit Excavation: Deep digging for building foundations, subway stations, and underground parking
- Slope & Embankment Finishing: Precise grading of dam slopes, highway embankments, and canal walls
- Demolition: High-reach configurations for safely tearing down tall structures
- Mining & Quarrying: Extended reach for trenching, overburden removal, and material handling
- Forestry & Land Clearing: Long-reach tree removal and vegetation management
Quality Assurance:
- ISO 9001 certified manufacturing with rigorous QC at every stage
- Stress-relief heat treatment eliminates welding residual stress, preventing micro-crack formation
- 100% dimensional inspection — pin hole alignment, boom foot geometry, and arm pivot verified against Hyundai 520 OEM drawings
- Load simulation testing on critical weld zones before shipment
- Export-grade packaging — bubble wrap + wooden crate for safe worldwide transport
Ordering & Support:
- MOQ: 1 set (boom + arm + hydraulic piping)
- Lead Time: 15–25 days for standard configurations; 30–45 days for fully custom builds
- Payment: T/T, L/C, Western Union
- Trade Terms: FOB Xiamen / Ningbo / Shanghai; CIF available
- Shipping: Disassembled for container loading; detailed installation drawings and technical guidance provided
- Fitment Verification: Hyundai 520 sub-models (HX520L, R520LVS, R520LC-9A) may have variations in boom foot geometry and hydraulic interface. Share your excavator’s model, year of manufacture, and photos of the boom foot and arm pivot — our engineering team will confirm the exact match and customize the kit accordingly.
Important Note on Stability: Extending the boom and arm significantly shifts the machine’s center of gravity. We strongly recommend adding an auxiliary counterweight and verifying ground bearing capacity before operation. Our technical team will advise on the optimal counterweight configuration for your specific reach requirements.
Transform Your Hyundai 520 Excavator Today!
Don’t limit your 52-ton machine to standard digging depths. With our high-quality long extended arm, your Hyundai 520 becomes a versatile long-reach excavator capable of tackling the toughest dredging, deep excavation, and demolition projects. Contact us for a competitive factory quote, or add to cart now. We respond to all inquiries within 24 hours and ship worldwide.
+86 1588 0208980
doozer@doozergroup.com
