BP2715E HNBR PU FKM Composite Oil Seal Kit for Excavator Boom & Arm Cylinder Maintenance

1. Quick Details of  seal BP2715E:

2. BP2715E picture:

3. Service part number :

4. FAQ

Q: Which excavator series and hydraulic cylinders can BP2715E seal kit match, and what sealing parts are included inside the kit?
A: This full oil seal kit fits mainstream medium and large crawler excavators, specially designed for boom cylinders and arm hydraulic cylinders. It is a complete overhaul set including rod oil seal, piston seal, PU buffer ring, PTFE anti-extrusion backup ring, FKM high temperature O-rings, dust wiper and matching small static gaskets. Maintenance workers do not need to purchase scattered seals separately during cylinder disassembly, effectively improving on-site maintenance efficiency.

Q: What core advantages does HNBR, PU, FKM and PTFE four-material combination bring to excavator hydraulic cylinder sealing?
A: Excavators work in complex construction sites with frequent reciprocating movements, heavy impact loads and alternating cold and hot climate all year round. HNBR main seals have outstanding oil resistance and ozone aging resistance, suitable for long-term contact with hydraulic oil. PU buffer rings absorb instantaneous hydraulic pressure peaks to avoid direct damage to sealing lips. FKM O-rings keep stable performance under continuous high temperature operation. PTFE flat rings reduce metal friction and prevent seal extrusion crack under instantaneous peak pressure, forming multi-layer protection to prolong overall service life.

Q: What color and structural features do each component of this seal kit have?
A: HNBR main oil seals are dark black with double-lip U-shaped structure and smooth polished lip surface. PU buffer rings are light yellow with tapered shock-absorbing outline. FKM O-rings are dark brown with uniform round cross-section without deformation. Milky white PTFE backup rings are thin flat rings with burr-free smooth edges. The dust wiper is black with outward dust scraping lip. All parts have standard unified sizes, easy to distinguish during assembly.

Q: What stable working pressure and temperature range can this whole set of seals withstand?
A: This composite seal kit can continuously bear stable working pressure up to 410 bar. HNBR and PU components work normally within -35°C ~ +125°C, while FKM O-rings can adapt to -25°C ~ +142°C. It can maintain reliable sealing effect in low-temperature mountain construction in winter and long-hour full-load excavation in summer, without swelling, hardening, cracking or internal and external oil leakage.

Q: What hidden mechanical faults and economic losses will inferior seal kits cause to excavator hydraulic systems?
A: Low-cost inferior seal kits use recycled ordinary NBR without HNBR, PU buffer and PTFE anti-extrusion layers. They age and wear rapidly under frequent impact and vibration, leading to serious internal and external oil leakage of hydraulic cylinders. The excavator will show slow action, weak digging force and obvious jitter during operation. Worn rubber debris will scratch piston rods and cylinder inner walls, bringing expensive metal replacement costs, and long equipment shutdown will delay construction progress and cause extra operation losses.

5. Exhibition and Wearhous

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