XINYA supplies excavator parts including hydraulic pumps, travel motors, swing devices, control valves, engine parts and undercarriage components. Send us your machine model, OEM part number or product photo for fast matching and quotation.

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工厂
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证书和品牌
产品主图替换 (49)
16
工厂
优势1
物流
展会图最终
证书和品牌

Hyundai 31QE-50111 Boom Cylinder Assembly

Place of Origin China/Korea
Brand Name LIRACE/Hyundai
Model Number R1200-9
Minimum Order Quantity 1 PCS
Price Negotiable price
Packaging Details Wooden case or as required
Delivery Time 5-8 Weekdays
Payment Terms Western Union,T/T
Supply Ability 300pcs /Month
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Basic Parameters & Introduction
The 31QE-50111 is a heavy-duty boom hydraulic cylinder assembly engineered as a direct OEM replacement for the Hyundai R1200-9 mining excavator. This cylinder serves as the critical actuator for boom lifting and lowering operations in large-scale mining and quarrying applications. The R1200-9 is a 118-tonne class mass excavation machine with an operating weight of 118,000 kg (260,140 lbs), powered by a 740 hp (552 kW) Cummins QSK23-C engine, and equipped with a 3.4 m dipper-arm and 6.7 m³ bucket. Key Specifications: Cylinder bore × stroke — 210 mm × 1,370 mm; Assembly weight — approx. 2,500 kg. The cylinder features high-strength alloy steel construction with an induction-hardened, hard-chrome-plated piston rod for superior wear resistance and extended service life under extreme loads. Compatible with R1200-9 and related large excavator models.
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Maintenance Tips
Proper maintenance is essential to maximize cylinder service life and ensure operational reliability in demanding mining environments. Daily (Every 10 hrs): Visually inspect the boom cylinder for external oil leaks at rod seals, tube welds, and hose fittings; protect the piston rod surface from impacts and scratches that may damage seals; check all mounting bolts for tightness. Every 1,000 hrs: Perform detailed inspection of the piston rod surface for scoring, pitting, or chrome flaking; regularly clean sediment on the dynamic seal dust ring and exposed piston rod surface; retighten all high-pressure flange bolts and pipe clamps to Hyundai-specified torque values. Major Overhaul (Every 4,000–8,000 hrs): Replace all internal seals, O-rings, and wear rings using OEM-grade seal kits. Frequently lubricate connecting parts to prevent corrosion or abnormal wear. Always refer to the Hyundai R1200-9 Operation & Maintenance Manual for serial-number-specific intervals.
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Installation Tips
Strict adherence to installation protocols is mandatory for safety and reliability. Mandatory Replacements: All gaskets, O-rings, backup rings, and cotter pins must be replaced with new components—never reuse old sealing elements. Surface Preparation: Thoroughly degrease and clean all mating flange surfaces and pin bore interfaces to eliminate contaminants before fitting. Torque Application: Tighten all mounting bolts and split flange clamps in a cross-pattern sequence in 3 incremental stages to Hyundai-specified torque specifications. Uneven torque distribution will cause flange distortion and premature seal failure. System Bleeding: After installation, perform a test run of full extension and full contraction for 3–5 cycles to exhaust air from the system and preheat each circuit, effectively preventing gas explosion in the cylinder block that may damage seals and cause internal leakage. Ensure all hydraulic hoses are routed without kinking and securely fastened with OEM-spec clamps.
Brand China/Korea Brand Name LIRACE/Hyundai
Model R1200-9 Product Name Boom Hydraulic Cylinder Assembly
Part Number 31QE50111 31QE-50111 ApplicableBrand Hyundai
Warranty Period 6-12 months Condition NEW
Standard or Non-standard Standard Type Guarantee We will inspect the products and send detailed pictures to the buyer for confirmation.
Applicable Industries Mechanical Repair Shops, Retail, Construction, Energy, Mining Shipping Method Sea freight, Air freight, DHL/FEDEX/TNT/EMS

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What if there are quality problems with the purchased products?

Please rest assured completely. We implement strict quality control throughout the whole production process. From raw material incoming inspection to finished product delivery, all items undergo multiple rounds of rigorous technical inspection and performance testing, to fully ensure every delivered product meets 100% qualified standards. All unqualified products detected during inspection will be disposed of by centralized destruction, to firmly prevent defective goods from entering the market. Meanwhile, we provide an extended warranty period of 6 to 12 months for all products. Within the warranty period, if any non-artificial quality failure occurs, please contact us promptly. Our professional technical team will respond at the earliest time and offer targeted solutions based on actual conditions. In addition, we deliver all-round technical support to safeguard your after-sales operation. Always taking customer satisfaction as the core principle, we are committed to establishing long-term and stable cooperative partnerships with global clients.
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What happens if the delivered item is unsuitable for my needs?

Please rest assured. To ensure that the products you receive fully meet your needs, we will conduct multiple rounds of demand confirmation with you before shipment, fundamentally avoiding the problem of wrong or missing delivery. To further ensure accuracy, we will first conduct precise query and verification through the product part number you provide to ensure that the product model and specifications are completely matched. If you do not have an accurate part number temporarily, we will arrange professional technicians to check and confirm one by one according to the clear product pictures and corresponding construction machinery models you provide, and communicate and synchronize with you throughout the process until confirmed correct before arranging shipment, to fully ensure that you receive the products you need and avoid unnecessary troubles.
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What professional shipping and delivery standards can we provide you?

Within our international trade operations, we prioritize a high-efficiency supply chain and a transparent logistics framework. To ensure the accuracy of every shipment, a standardized PDI (Pre-Delivery Inspection) system is strictly enforced. Before the final sealing of containers, our QC specialists conduct a thorough re-examination. We provide clients with high-resolution photos of the actual items, packaging details, and the Packing List for Visual Confirmation, ensuring 100% compliance with order specifications and delivery transparency. We support versatile Incoterms, including EXW and FOB. To meet diverse delivery timelines and cost constraints, we offer a multi-modal logistics matrix ranging from Ocean Freight and Air Freight to global couriers (DHL/FEDEX/TNT/EMS). We guarantee full professional documentation support for every shipment to ensure a safe, timely, and compliant arrival at the port of destination.
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