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

1. คุณสมบัติเด่นและประโยชน์

• 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 – The factory power control (load‑sensing) system is completely rebuilt. It continuously matches pump output to actual working demand, reducing fuel consumption, preventing engine stall under sudden load, and extending the life of the entire hydraulic system. The integral pilot gear pump is also fully remanufactured.

• 高性价比的全新原厂件替代方案 – 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.

• 发货前目视确认 – 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.

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

2. การสมัคร

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 – 在磨蚀性粉尘条件下进行卡车装载、料堆管理和物料搬运。新的轴承、密封件和耐磨板确保泵在磨损单元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。.

• 矿山辅助作业 – 现场清理、道路维护、排水工程及设备平台平整。负载敏感控制在轻载循环期间可降低燃油消耗，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、不可预测条件的能力。.

• 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、倒木、隐蔽障碍物。集成的功率控制可防止突然负载峰值下发动机熄火，为锯具、抓具和粉碎机保持稳定的液压动力。.

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:

• Replace hydraulic filters on schedule – Contaminated oil is the #1 killer of hydraulic pumps. Use genuine or high‑quality filters and change them at Hitachi‑recommended intervals (typically 500–1,000 hours). A clogged or bypassing filter allows debris to score the cylinder block and valve plate.

• Keep oil clean and at the correct viscosity – Use ISO VG 46 for normal temperatures, ISO VG 68 for hot climates or continuous heavy duty. Water contamination degrades oil and causes internal rust. Have your oil analysed annually.

• Warm up the pump before heavy work – Run the engine at low idle for 3–5 minutes, then cycle all hydraulic functions slowly without load. This allows oil to reach all internal components and prevents cavitation damage.

• Monitor case drain flow – 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.

• ฟังเสียงผิดปกติ – Knocking, whining, or squealing from the pump area often indicates cavitation (starved suction), worn bearings, or loose mounting. Investigate immediately – continued operation will cause catastrophic failure.

• Check pump alignment – Misalignment between the pump and engine flywheel housing puts side load on the shaft, destroying bearings and the shaft seal. After any engine or pump removal, verify alignment with a dial indicator.

• Keep the case drain line clear – A kinked or blocked case drain line will cause back pressure inside the pump housing, blowing the shaft seal. Inspect the line whenever you service the pump.

• Store spare pumps properly – Keep remanufactured pumps in their original wooden case, in a dry, clean environment. Rotate the shaft by hand every 6 months to redistribute internal lubricant.

• Use new O‑rings and sealing washers – When installing a remanufactured pump, always replace all seals on hydraulic connections. Reused seals are the most common source of external leaks.

• Bleed air after installation – 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.

• Keep a service log – Record installation date, hours, oil changes, and any unusual observations. This helps you anticipate pump life and avoid unexpected downtime.

Critical installation tip for the 9147340 / 9149225 remanufactured pump set:
– 壳体泄油管路 每台泵上的泄油口必须畅通无阻。堵塞的壳体泄油管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。来自旧泵的污染物会像损坏新泵一样迅速地毁坏再制造单元。.
– 在每个液压连接处使用新的 O 型圈和密封垫圈。重复使用密封件必定导致泄漏。.
– 安装后，在泵处于中位的情况下，让发动机以低怠速运行2–3分钟，然后缓慢循环每个功能（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。. 我们不为原装二手或再制造零件提供保修服务。. 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确认。对于需要保修选项的客户，我们可以提供全新的售后市场单元报价——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.