R320LC-7 R320-7 Hydraulic Boom Cylinder for Hyundai Excavator Spare Parts 31Y1-19041 Aftermarket High Quality
| Hydraulic Parts | Hydraulic Pump | Final Drive | Travel Reduction |
| Swing Motor | Swing Reduction | Control Valve | Gear Parts |
| Slew Bearing | Engine Assembly | Hydraulic Cylinder | ECU |
Premium aftermarket boom hydraulic cylinder PN 31Y1-19041, direct OEM replacement for Hyundai R320-7 and R320LC-7 large excavator. It manages boom up & down movement for quarry rock mining, heavy soil shifting and large infrastructure construction. Manufactured strictly based on original Hyundai technical drawing with consistent lug dimension, pin span and oil port position to realize plug-and-fit installation without field machining.
| Item | Specification |
|---|---|
| Product Name | Hydraulic Boom Cylinder |
| Applicable Model | Hyundai R320-7, R320LC-7 |
| OEM Part Number | 31Y1-19041 |
| Grade | Brand New Premium Aftermarket |
| Warranty | 12 months against factory production defects |
| MOQ | 1 unit available from warehouse stock |
| QC Certificate | ISO9001 full hydraulic inspection passed |
| Spec Item | Data |
|---|---|
| Bore Diameter | 160mm |
| Piston Rod Diameter | 115mm |
| Working Stroke | 1680mm |
| Rated Working Pressure | 34MPa |
| Factory Test Pressure | 51MPa (1.5 times rated working pressure) |
| Barrel | 25Mn seamless alloy steel with precision inner honing |
| Piston Rod | 40Cr tempered steel + 28~32μm hard chrome plating, HRC67~70 anti-abrasion & anti-bending |
| Seal Set | Import PU+NBR composite seals, high temperature resistant & anti-oil aging |
| Operating Temp | -25℃ ~ +85℃ |
| Design Service Life | ≥8100 working hours under heavy-duty site condition |
| Mount Structure | Double ear lugs fitted with quenched copper wear-resistant bushings |
- Complete OEM Interchange: Fully identical dimension with original 31Y1-19041, perfectly matched with original boom arm and hydraulic tubing of R320LC-7.
- Mining-Grade Reinforced Build: Thickened ear root and strengthened cylinder tube withstand frequent stone impact, effectively prevent lug crack and piston rod deformation.
- 100% Pre-shipment Pressure Test: Every finished cylinder completes tightness test and full-stroke cyclic test before delivery to eliminate internal & external oil leakage.
- High Cost Performance: Equivalent working performance as genuine Hyundai spare part while saving around 45% purchasing cost for repair dealers.
- Diversified Shipping Options: In-stock goods dispatched within 3 working days; urgent air shipment 3~7 days, economical sea transport 32~40 days for bulk orders.
Our factory has specialized in Hyundai R-7 series hydraulic cylinder production for over 12 years, covering full boom/arm/bucket cylinder range of R140LC-7, R210LC-7, R320LC-7, R330LC-7, goods widely exported to Southeast Asia, Africa and Middle East spare parts market.
Q1: Can this boom cylinder be fitted on modified long-arm R320LC-7 custom machines?
A: Not suggested, customized long-arm version needs special customized cylinder with longer stroke instead of standard 31Y1-19041.
Q2: Does standard order come with matching connecting pins?
A: Standard packing excludes mounting pins; matched size pins can be supplied at discounted extra cost upon buyer’s request.
Q3: What protective measures for long humid ocean delivery?
A: Inner cylinder filled with anti-rust oil, rod coated anti-rust grease, wrapped waterproof PE film and packed into solid export plywood case.
Q4: Any preferential price if I buy full set boom+arm+bucket cylinders together?
A: Full-set combined purchase gets tiered unit discount and consolidated single freight to lower total logistics expenditure.
Q5: What support can I get when leakage happens within warranty term?
A: Send clear leakage photos plus excavator serial number, we supply free replacement seal kit or online professional installation guidance accordingly.
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