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R320LC-7 R320-7 Hydraulic Arm Cylinder for Hyundai Excavator Spare Parts 31Y1-19050 Aftermarket High Quality
Hyundai R320LC-7 Arm Hydraulic Cylinder | PN:31Y1-19050 | Premium Aftermarket Replacement
1. Basic Product Info
High-quality aftermarket stick/arm hydraulic cylinder, OEM part number 31Y1-19050, direct replacement for Hyundai ROBEX R320LC-7 / R320-7 32-ton crawler excavator. Controls arm stretching & retraction for heavy earthmoving, rock excavation, quarry and heavy construction jobs. Produced per original Hyundai drawing with identical pin spacing, mounting dimension and oil port layout for direct bolt-on installation without modification.
| Item | Details |
|---|---|
| Product Name | Hydraulic Arm/Stick Cylinder |
| Fit Model | Hyundai R320LC-7, R320-7 |
| OEM Part No. | 31Y1-19050 |
| Quality | Brand New Premium Aftermarket |
| Warranty | 12 months against manufacturing defects |
| MOQ | 1pc in stock for fast delivery |
| QC Standard | ISO9001 certified, full hydraulic pressure test before shipment |
2. Core Technical Specs
| Specification | Parameter |
|---|---|
| Bore Size | 150mm |
| Piston Rod Diameter | 110mm |
| Working Stroke | 1765mm |
| Rated Working Pressure | 34MPa |
| Factory Test Pressure | 51MPa (1.5×working pressure) |
| Barrel Tube | 25Mn seamless honed alloy steel, anti-deformation heat treatment |
| Piston Rod | 40Cr tempered steel + 28~32μm hard chrome plating, surface HRC67~70 wear-resistant |
| Complete Seal Kit | Import PU+NBR seals, high temp & anti-aging |
| Working Temp | -25℃ ~ +85℃ |
| Service Life | ≥8000 working hours under heavy load |
| Structure | Double lug with quenched copper wear bushing |
3. Product Advantages
- 1:1 OEM Interchange: Fully matches original 31Y1-19050 size, perfect fit R320LC-7 arm linkage and original hydraulic pipeline.
- Heavy-Duty Reinforced Structure: Thickened lug base & strengthened cylinder barrel, anti-impact from rock collision in mining sites, avoid ear cracking & rod bending.
- Strict Pre-delivery Inspection: Every cylinder passes leak test & full-stroke reciprocating cycle test to eliminate inner/outer oil leakage risk.
- Cost Saving Solution|Same performance as genuine Hyundai spare part, save 40%-50% purchase cost for repair shop & spare parts wholesaler.
- Flexible Shipment: In-stock items ship within 3 working days; air delivery 3~7 days, sea freight 30~40 days for bulk order.
4. Supplier Brief
We focus on Hyundai R-7 series excavator hydraulic cylinders over 12 years, full boom/arm/bucket cylinder range for R140LC-7, R320LC-7, R330LC-7, R370LC-7, products widely exported to Africa, Southeast Asia, Middle East construction spare parts market.
5. FAQ
Q1: Can this arm cylinder fit R320LC-5 model?
A: No, R320LC-5 uses different OEM part number with different mounting size, not interchangeable.
Q2: Can I buy matching seal kit separately?
A: Exclusive repair seal kit for 31Y1-19050 available separately with bundle discount, seals not pre-installed by default.
Q3: Anti-rust package for long sea transit?
A: Inner cylinder filled with anti-rust oil, piston rod coated anti-rust grease, wrapped waterproof PE film + solid export plywood case.
Q4: Discount for bulk order or full set (boom+arm+bucket cylinder)?
A: Tiered price discount for bulk purchase, combined shipment reduces total freight cost.
Q5: Warranty policy for oil leakage?
A: Provide clear leakage photos + excavator serial number, free replacement seal kit or remote installation guidance within warranty period.
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