日立EX200-5液压主泵 – 中国再制造（原装日本总成：9147340 / 9149225）

1. Các tính năng và lợi ích chính

• Precision‑remanufactured for original Japan‑built EX200‑5 – This twin pump set (9147340 / 9149225) is specifically rebuilt to Hitachi‘s factory specifications for the original (Japan‑assembled) EX200‑5 excavator. Every critical component – cylinder block, piston assemblies, valve plate, swashplate, bearings, and seals – is either renewed or replaced with new, high‑quality parts. The result is restored hydraulic performance at a fraction of the cost of a new genuine pump set.

• Original Hitachi tandem axial piston architecture – The two pumps work together as a variable displacement tandem system, powering travel, swing, boom, arm, and bucket circuits independently. This design ensures smooth, coordinated multi‑function operation without internal flow loss – exactly as your EX200‑5 performed when it left the factory.

• Restored 20‑ton class power – After remanufacturing, the pump set delivers a rated working pressure of 31.9 MPa (≈4,630 psi) with intermittent peaks up to 34.3 MPa (≈4,975 psi). Combined flow is approximately 360‑400 L/min at rated engine speed. Your excavator regains full digging force, fast cycle times, responsive swing, and powerful travel.

• 集成式负载敏感功率控制 – 工厂原装功率控制（负载敏感）系统已完全重建。该系统持续匹配泵输出与实际工作需求，从而降低燃油消耗，防止突然负载下的发动机熄火，并延长整个液压系统的寿命。集成的先导齿轮泵也已全面再制造。.

• 高性价比的新品替代方案 – A new Hitachi main pump set for a 20‑ton excavator is a major investment. Our remanufactured 9147340 / 9149225 gives you the same fit, form, and function at a significantly lower price, without sacrificing reliability. Each pump is dyno‑tested before dispatch.

• 直接螺栓固定替换 – Mounting flanges, drive shaft splines, and hydraulic port configurations are restored to original Japan‑spec Hitachi dimensions. No modifications, no adapters, no fabrication – your mechanic unbolts the old pumps and bolts these in.

• 发货前视觉确认 – We send you clear, high‑resolution photographs of the actual remanufactured units (mounting flanges, splines, port threads, castings, overall condition) before packing. You approve shipment – we never ship blind.

• Giao hàng nhanh – 5–8 working days from our Guangzhou warehouse. Monthly supply capacity of 300 sets, available for single‑set or bulk orders.

2. Ứng dụng

The remanufactured Hitachi 9147340 / 9149225 main pump set is ideal for the original Japan‑built EX200‑5 (20‑ton class) used in demanding job sites:

• 重型建筑与基础设施 – Highway excavation, dam building, bridge footings, large‑scale earthmoving. The restored tandem pumps deliver simultaneous boom, arm, and travel power without internal leakage – no power fade, no sluggish response, even on long shifts.

• 采石与骨料生产 – 在含磨蚀性粉尘的环境中装载卡车、堆料管理和物料搬运。新轴承、密封件和耐磨板确保泵在旧件已失效的工况下仍能可靠运行。稳定的流量和压力意味着更快的循环时间和更低的燃油消耗。.

• 矿山支持 – 场地清理、道路维护、排水工程及设备平台平整。负载敏感控制可在轻载工况下降低燃油消耗，在数千小时的运行中节省成本。.

• 拆除与废料处理 – 冲击载荷和振动是常态。我们的再制造工艺更换了所有磨损部件，恢复了泵承受恶劣、不可预测工况的能力。.

• 设备租赁车队 – 20吨级挖掘机是租赁市场的常用设备。再制造泵组提供可预测的使用寿命（3,000-5,000小时），其成本使得主动更换在经济上变得合理 – 避免了租赁期间代价高昂的故障、拖车费用和客户投诉。.

• 林业与土地清理 – 陡坡、倒伏树木、隐蔽障碍物。集成的功率控制可防止在突然的负载峰值下发动机熄火，为锯具、抓斗和粉碎机维持稳定的液压动力。.

3. Maintenance Tips – Extend the Life of Your Remanufactured Pump Set

A properly installed and maintained pump set can deliver years of reliable service. Follow these tips to protect your investment:

• 按时更换液压滤芯 – 受污染的油液是液压泵的 #1 杀手。使用正品或高质量滤芯，并按照日立推荐的间隔（通常为 500–1,000 小时）进行更换。堵塞或旁通的滤芯会让碎屑刮伤缸体和配流盘。.

• 保持油液清洁且粘度正确 – 正常温度下使用 ISO VG 46，炎热气候或持续重载下使用 ISO VG 68。水污染会劣化油液并导致内部生锈。建议每年对油液进行分析。.

• 重载作业前预热泵 – 让发动机以低怠速运转 3–5 分钟，然后无负载地缓慢循环所有液压功能。这可使油液到达所有内部部件，防止气蚀损坏。.

• 监测壳体回油流量 – Excessive case drain leakage (more than 15–20 L/min per pump) indicates internal wear. Measure it every 1,000 hours. A sudden increase signals impending failure.

• Hãy chú ý lắng nghe những tiếng động bất thường – 来自泵区域的敲击声、啸叫声或尖叫声通常表明存在气蚀（吸油不足）、轴承磨损或安装松动。请立即检查 – 继续运行将导致灾难性故障。.

• 检查泵的对中情况 – 泵与发动机飞轮壳之间的不对中会给轴带来侧向载荷，从而损坏轴承和轴封。在拆卸发动机或泵后，务必使用千分表验证对中情况。.

• 保持壳体回油管路畅通 – 扭结或堵塞的壳体回油管路会在泵壳内部产生背压，导致轴封损坏。每次维修泵时都应检查该管路。.

• 妥善存放备用泵 – 将再制造泵存放在其原始木箱中，置于干燥、清洁的环境中。每 6 个月手动转动轴一次，以重新分配内部润滑油。.

• 使用新的 O 型圈和密封垫圈 – 安装再制造泵时，务必更换所有液压连接处的密封件。重复使用旧密封件是外部泄漏最常见的来源。.

• 安装后排出空气 – After fitting the pump set, run the engine at low idle and slowly cycle each function several times to purge trapped air. Air in the system causes cavitation and noisy operation.

• 保留维护日志 – 记录安装日期、运行小时数、换油情况以及任何异常观察结果。这有助于您预估泵的使用寿命并避免意外停机。.

Critical installation tip for the 9147340 / 9149225 remanufactured pump set:
– 壳体回油管路 每个泵上的泄油口必须清洁畅通无阻。堵塞的泄油口会在首次启动时立即冲毁轴封。.
– 在安装再制造泵之前，请冲洗整个液压系统并更换所有滤芯。来自失效旧泵的污染物会像损坏新泵一样迅速地毁掉再制造单元。.
– 在每个液压连接处使用新的 O 型圈和密封垫圈。重复使用旧密封件必然导致泄漏。.
– 安装后，在泵处于中位的情况下，让发动机以低怠速运转2-3分钟，然后缓慢操作每个功能（动臂、斗杆、铲斗、回转、行走）以排出系统中的空气。.
– 检查泵与发动机飞轮壳的对中情况 – 不对中会导致轴承过早失效和轴封泄漏。.

保修说明： 保修期为3至6个月，具体取决于产品详情。. 我们不提供原厂旧件或再制造零件的保修服务。. 我们的价值在交付前就已体现：精心的再制造、彻底的测试以及发货前的视觉验证。对于需要保修选项的客户，我们可以提供新的售后市场产品报价 – 请咨询我们的销售团队。.

Send us your original Japan‑built EX200‑5 machine serial number and photos of the old pumps – we will confirm compatibility, provide a quote, and document our pre‑shipment inspection within 24 hours.