日立 ZAX870-5G / ZAX890-5A 泵分动箱总成 – 中国再制造 (YB60000413)

১. মূল বৈশিষ্ট্য ও সুবিধা

• Precision‑remanufactured transfer case – OEM part number YB60000413. Fully disassembled, cleaned, crack‑inspected, and rebuilt with new bearings, seals, gaskets, and reconditioned gear surfaces. Restored to deliver power distribution performance matching original Hitachi specifications.

• Critical power‑splitting component for 80–85‑ton excavators – The transfer case sits between the engine-driven hydraulic main pumps (typically the HPK300, OEM part number 9298854 / YB60000246 for these large models) and the pump drive gear train from the engine flywheel housing. Its job is to split engine torque to drive the dual hydraulic main pumps while also supplying power to auxiliary pump mounts, ensuring each pump receives the correct speed and torque for its hydraulic circuits. When the transfer case fails – due to bearing seizure, gear wear, seal leakage, or lubrication breakdown – the main pumps cannot operate, and the entire machine stops.

• Restores 80‑ton class hydraulic power – Your ZAX870‑5G or ZAX890‑5A is a large excavator (approximately 80–85 metric tons, operating weight of the ZX870‑5G is approx. 80,800–82,600 kg). The transfer case must reliably transmit the engine’s full 360–377 kW (483–506 HP) to the hydraulic pumps without internal power loss. A rebuilt transfer case ensures full flow and pressure reach the main pumps – restoring original digging force, swing torque, and travel power.

• New bearings and high‑temperature seals – The most common failure points in these high‑hour transfer cases are bearing fatigue (from millions of stress cycles) and seal deterioration (leading to oil leaks, contamination ingress, and eventual gear damage). Every bearing is replaced – never reused. All seals and O‑rings are replaced with high‑temperature fluororubber (FKM) rated for heavy‑duty mining conditions.

• Gear surfaces inspected and reconditioned as needed – Gear teeth are inspected for pitting, spalling, or uneven wear. Where possible, gears are reconditioned; badly worn gears are replaced with new OEM‑grade components. The reconditioned gear train runs quieter, with less vibration, and provides consistent torque splitting across both pump drive positions.

• Cost‑effective alternative to new OEM – A new Hitachi transfer case for an 80‑ton excavator is a major capital expense. Our remanufactured YB60000413 gives you the same fit and function at a significantly lower cost, without compromising reliability. Each unit is tested before dispatch.

• Direct bolt‑on replacement for ZAX870‑5G / ZAX890‑5A – Mounting flanges, drive splines, and port/bolt patterns match original Hitachi dimensions exactly. No modifications, no adapters – your mechanic unbolts the old transfer case and bolts this one in.

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

• দ্রুত ডেলিভারি – 5–8 working days from our Guangzhou warehouse. Monthly supply capacity of 300 units, available for single‑piece or bulk orders.

২. আবেদনসমূহ

The remanufactured Hitachi YB60000413 pump transfer case assembly is ideal for ZAX870‑5G and ZAX890‑5A excavators (and compatible ZX870‑5G, ZX870LC‑5G, ZX870H‑5G, ZX870LCH‑5G, ZX890‑5A variants) used in high‑production environments:

• 大型露天采矿 – 80–85‑ton excavators load haul trucks, clean mine faces, and maintain roads in 20+ hour shifts. The transfer case runs constantly under full engine load. A worn unit introduces power loss and heat, slowing cycle times. A remanufactured transfer case with new bearings and seals restores efficient power transmission – keeping the main pumps at full output, reducing fuel consumption, and preventing unexpected production stops.

• Heavy civil & infrastructure projects – Dam construction, highway cuts, tunnel portals, and large‑scale earthmoving demand consistent multi‑function hydraulic power. A failing transfer case starves the main pumps, causing sluggish boom response and slower cycle times. Our remanufactured unit restores original responsiveness.

• 采石与骨料生产 – Granite, limestone, and basalt operations subject the drivetrain to extreme shock loads and abrasive dust. The transfer case’s reconditioned gear train and new sealing system resist contamination ingress – keeping the pump drive system clean and protected.

• 设备租赁车队维护 – Large excavators are high‑value rental assets. A transfer case failure mid‑rental creates costly recovery logistics and customer complaints. A remanufactured unit offers predictable service life (3,000–5,000 hours) at a cost that makes proactive replacement financially sensible – avoiding expensive emergency repairs and downtime.

• 林业与土地清理 – Steep slopes, fallen timber, and hidden obstacles place uneven loads on the pump drive system. The transfer case must split torque reliably under fluctuating demand. A properly remanufactured unit with new bearings maintains smooth power delivery, preventing engine stall when load spikes occur.

3. 为何选择 হংতেংদা পার্টস – 真正有效的再制造

Many hydraulic shops offer “rebuilt” transfer cases. They disassemble, replace a few O‑rings, add new paint, and call it done. The bearings remain fatigue‑cracked. The gear surfaces retain microscopic pitting. Within 500–1,000 hours, internal leakage returns, oil temperature climbs, and the drive system loses efficiency again.

我们的再制造不同。我们更换磨损的部件，而不仅仅是泄漏的部件。.

我们的 6 步流程：

1. – 单元被拆解为单个部件：轴承保持架、行星架、齿圈、主轴、活塞块、缸筒、配流盘、液压马达部分和制动器组件。 – Transfer case stripped to every component: housing, shafts, all bearings, gears (input, intermediate, output), seals, O‑rings, gaskets.

2. 清洁与裂纹检测 – 所有部件清洁，关键铸件进行着色渗透检测。不可修复的部件予以报废。.

3. 磨损部件更换 – All bearings replaced – never reused. All seals and gaskets replaced with new. Gears inspected and reconditioned where possible; badly worn gears replaced with new OEM‑grade components.

4. 精密重新组装 – Assembled using OEM torque specs. Gear lash and bearing preload verified.

5. Functional validation – Reassembled unit checked for smooth rotation and correct torque transmission. (Note: The transfer case is a mechanical drive component; full validation is confirmed during assembly and installation testing.)

6. 最终质量检查与包装 – Housing painted, ports capped, packed in heavy‑duty wooden case for export.

您购买的是： A transfer case with new bearings, new seals, reconditioned gear surfaces – restored to OEM performance. Not a band‑aid.

您未购买的是： A used transfer case with fresh paint and a set of O‑rings.

• 超过25年的行业经验 – Founded in 2001, we have remanufactured thousands of hydraulic pumps and drivetrain components for Hitachi, Caterpillar, Komatsu, Kobelco, Volvo, SANY, and many other brands. Our workshop knows the ZAX870‑5G and ZAX890‑5A platforms.

• 90% স্টকের উপলব্ধতা – YB60000413 pump transfer cases are in stock as remanufactured units, ready for dispatch from our Guangzhou warehouse.

• 24小时内发货 – 从我们广州枢纽到您的货运代理只需 1 天；国际订单在 24 小时内发货。.

• 发货前视觉确认 – Never blind. You receive clear photos of the actual unit before packing – you approve, we ship.

• প্রযুক্তিগত সহায়তা – Send us your ZAX870‑5G or ZAX890‑5A machine serial number and a photo of the old transfer case. We confirm compatibility and provide installation guidance within 24 hours.

Send us your Hitachi ZAX870‑5G or ZAX890‑5A machine serial number and a photo of the old transfer case – we will verify fitment, provide a quote, and document our pre‑shipment inspection within 24 hours.

Critical installation tip for the YB60000413 transfer case:
– Alignment is critical. The transfer case must be precisely aligned with the engine flywheel housing and main pumps. Misalignment will cause premature bearing failure, shaft seal leakage, and gear noise.
– Before installing, inspect all mounting bolts – use new high‑strength fasteners and torque to Hitachi factory specifications. Always replace lock washers or thread‑locking compound as required.
– Check the case drain line (if equipped) – The transfer case requires proper lubrication and may have venting/drain lines. Ensure they are clear and unrestricted.
– When refitting the main pumps (HPK300 / YB60000246) onto the transfer case drive flanges, ensure the drive splines are clean, lightly greased, and fully engaged before tightening pump mounting bolts.
– Use new O‑rings and sealing washers on all hydraulic and lubrication connections. Reused seals guarantee leaks.
– After installation, fill with the correct lubricant (refer to Hitachi service manual; typically heavy‑duty gear oil meeting API GL‑5 or equivalent). Check oil level before first startup.
– After installation, run the engine at low idle and monitor for unusual noise or vibration from the transfer case area. If noise is present, recheck alignment and oil level.

保修说明： 保修期根据产品详情为3至6个月。. 对于原装二手或再制造零件，我们不提供保修服务。. Our value is delivered upfront: careful remanufacturing, thorough inspection, and pre‑shipment visual verification. For customers who require a warranty‑covered option, we can quote new aftermarket units – ask our sales team.

The pump transfer case is the mechanical hub that splits engine power to your ZAX870‑5G or ZAX890‑5A‘s main hydraulic pumps. When it fails, the pumps stop. No flow. No movement. A remanufactured YB60000413 from Hongtengda Parts restores full power transmission – not with shortcuts, but with factory‑grade restoration.