349EL Excavator Boom Hydraulic Cylinder 358-8439 170mm Bore 1524mm Stroke Aftermarket
High-quality aftermarket boom hydraulic cylinder, OEM part number 358-8439(3588439), direct interchange for 349EL /349E /349FL large 49-ton crawler excavator. Controls boom lifting/lowering for heavy mining, rock quarry, bulk earthmoving and high-load engineering construction. Fully manufactured per original CAT drawing with identical mounting lug size, pin pitch and oil port layout for direct bolt-on installation without modification.
| Item | Details |
|---|---|
| Product Name | Boom Hydraulic Cylinder |
| Fit Model | CAT 349EL,349E,349FL |
| OEM Code | 358-8439 / 3588439 |
| Quality Grade | Brand New Premium Aftermarket |
| Factory Warranty | 12 Months against manufacturing defect |
| MOQ | 1pc available from in-house stock |
| QC Certificate | ISO9001 full hydraulic pressure inspection |
| Spec Item | Parameter |
|---|---|
| Bore Diameter | 170mm |
| Piston Rod Diameter | 115mm |
| Stroke Length | 1524mm |
| Rated Working Pressure | 35MPa(5080PSI) |
| Factory Test Pressure | 52.5MPa (1.5×rated working pressure) |
| Barrel Tube | ST52 seamless alloy steel, precision inner honing processing |
| Piston Rod | Medium carbon steel + 28~32μm hard chrome plating, surface hardness HRC67~70 anti-abrasion & anti-bending |
| Complete Seal Kit | Import PU+NBR composite sealing parts, oil-proof, anti-aging & high temperature resistant |
| Working Temperature | -25℃ ~ +85℃ |
| Design Service Life | ≥8500 working hours under heavy rock loading |
| Structure | Double lug with quenched copper wear-resistant bushing |
- 1:1 OEM Replacement: Same installation dimension as original CAT spare part, directly replace original 358-8439 cylinder for full serial number 349E/349EL/349FL machines.
- Heavy-Duty Reinforced Design: Thickened ear base and reinforced cylinder barrel effectively resist frequent rock impact, prevent lug cracking and piston rod deformation under heavy mining load.
- Full Pre-shipment Test: Every finished cylinder passes full-pressure leak test & reciprocating cycle test before delivery to eliminate inner & outer oil leakage hidden trouble.
- Cost-Effective Option: Equal working performance with genuine CAT cylinder while saving 40%~50% purchasing cost for repair shops & spare parts wholesalers.
- Flexible Delivery: In-stock items ship out within 3 working days; air freight 3~7 days, sea shipment 32~40 days available for bulk order.
We specialize in CAT E/EL/F series excavator hydraulic cylinders over 13 years, complete boom/arm/bucket cylinder lineup for CAT345CL,349E/EL,349FL,374F models, products widely exported to Africa, Southeast Asia, Middle East construction spare parts market.
Q1: Does this boom cylinder fit CAT349D/349DL?
A: No, 349D series uses different OEM part number, cannot cross installation.
Q2: Can I purchase matching repair seal kit separately?
A: Matching exclusive seal kit for PN358-8439 is available for separate sale with bundle discount; seals are not pre-installed on cylinder by default.
Q3: Anti-rust package for long ocean shipment?
A: Inner cylinder filled with anti-rust hydraulic oil + piston rod coated anti-rust grease + waterproof PE wrapping + solid export plywood case packaging.
Q4: Discount for full set order(boom+arm+bucket cylinder)?
A: Full set combined purchase enjoys tiered unit discount & consolidated one-time freight to cut total logistics expense.
Q5: Warranty solution for oil leakage within valid period?
A: Provide clear leakage photos + excavator machine serial number, we offer free replacement seal kit or remote professional installation guidance accordingly.
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