Hitachi EX200-5 Hydraulic Main Pump – China Remanufactured (Original Japan Assembly: 9147340 / 9149225)

1. Key Features & Benefits

• 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.

• Integrated load‑sensing power control – 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.

• Cost‑effective alternative to new genuine – 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.

• Direct bolt‑on replacement – 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.

• Pre‑shipment visual verification – 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.

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

2. Applications

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:

• Heavy construction & infrastructure – 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.

• Quarrying & aggregates – Loading trucks, stockpile management, and material handling in abrasive dust conditions. New bearings, seals, and wear plates ensure the pumps survive where worn units fail. Consistent flow and pressure mean faster cycle times and lower fuel consumption.

• Mining support – Site cleanup, road maintenance, drainage works, and equipment pad grading. The load‑sensing control reduces fuel burn during light‑duty cycles, saving money over thousands of operating hours.

• Demolition & scrap processing – Shock loads and vibration are routine. Our remanufacturing process replaces all wear components, restoring the pumps‘ ability to withstand harsh, unpredictable conditions.

• Equipment rental fleet – 20‑ton excavators are rental workhorses. A remanufactured pump set offers predictable service life (3,000–5,000 hours) at a cost that makes proactive replacement financially sensible – avoiding costly mid‑rental failures, towing bills, and customer complaints.

• Forestry & land clearing – Steep slopes, fallen timber, hidden obstacles. The integral power control prevents engine stall under sudden load spikes, maintaining consistent hydraulic power for saws, grapples, and mulchers.

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.

• Listen for unusual noises – 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:
– The case drain line on each pump must be clear and unrestricted. A blocked case drain will blow the shaft seal instantly on first startup.
– Before installing the remanufactured pumps, flush the entire hydraulic system and replace all filters. Contaminants from the failed pumps will destroy a remanufactured unit just as quickly as a new one.
– Use new O‑rings and sealing washers on every hydraulic connection. Reused seals guarantee leaks.
– After installation, run the engine at low idle for 2–3 minutes with the pumps in neutral, then slowly cycle each function (boom, arm, bucket, swing, travel) to purge air from the system.
– Check pump alignment with the engine flywheel housing – misalignment causes premature bearing failure and shaft seal leakage.

Warranty note: Warranty period is 3 to 6 months depending on product details. We do not provide warranty service for original used or remanufactured parts. Our value is delivered up front: careful remanufacturing, thorough testing, and pre‑shipment visual verification. For customers who require a warranty‑covered option, we can quote new aftermarket units – ask our sales team.

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.