Nachi PVK-2B-505-N 4466797 hydraulic pump for Hitachi ZX55 mini excavator
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Product Brief
This aftermarket axial piston main pump with part number 4466797, model PVK-2B-505-N, serves as the core hydraulic power unit built for Hitachi ZX55 mini excavator. It converts engine rotary power into adjustable high-pressure hydraulic oil flow to drive bucket digging, boom lifting, arm movement, machine swing and crawler travel. Widely used in residential trenching, garden landscaping, small-scale site leveling and indoor demolition jobs, this replacement pump is popular among overseas repair shops, mini excavator rental firms and cross-border spare part dealers for hydraulic system overhaul and direct worn pump replacement of Hitachi ZX55 machine fleets.
During long-term site operation under frequent start-stop cycles, hydraulic oil contamination and continuous pressure fluctuation, the original pump will gradually suffer cylinder barrel scuffing, piston shoe abrasion, valve plate erosion and rising internal leakage. Typical failure symptoms include weak digging capacity, slow combined movements, power drop under heavy load, elevated hydraulic oil temperature, strange rattling noise from pump housing and unstable machine action response. Once severe internal damage occurs, the whole hydraulic system loses working capability, resulting in machine shutdown, high field maintenance fees and delayed construction schedules for equipment operators.
Our aftermarket hydraulic pump strictly replicates original sample standards for mounting flange dimension, drive shaft spline profile, oil port layout and regulator pressure preset value. No extra drilling, cutting or gasket modification is needed during field assembly. On-site mechanics can complete pump replacement smoothly and greatly cut machine downtime. Compared with high-priced genuine pumps with long procurement lead times, this hydraulic pump delivers stable working performance and supports bulk repeat purchasing for global distributors specializing in Hitachi mini excavator hydraulic spare parts.
Product Highlights
1. Full interchangeability for fast on-site mini excavator hydraulic overhaul
All flange sizes, oil port positions and drive shaft spline parameters match OEM specifications. Maintenance technicians can finish pump swap without secondary machining work, improving overhaul efficiency for service centers and used mini excavator refurbishment projects.
2. Optimized friction pair design to adapt frequent cyclic working conditions
Many low-cost substitute pumps quickly lose volumetric efficiency when running with contaminated hydraulic fluid containing tiny metal particles. Our core internal friction components adopt upgraded heat treatment plus precision surface grinding craft, enhancing anti-wear and anti-cavitation properties, extending service life for ZX55 mini excavators working in compact construction sites.
3. Complete performance inspection before product shipment
Each finished hydraulic pump undergoes pressure holding test, flow calibration and noise detection on dedicated hydraulic test bench before packing. Defective workpieces are filtered out inside factory, lowering rework risk for service crews and preventing unexpected hydraulic system breakdown at construction sites.
4. Budget-friendly aftermarket solution for mini excavator fleet maintenance
Genuine main pumps for Hitachi ZX55 carry high purchase cost and unstable stock availability. Our factory-direct replacement pump balances reliable hydraulic output and competitive price, helping equipment owners and service workshops reduce overall maintenance expenditure for mini excavator fleets.
5. Multiple shipping selections for bulk order buyers
In-stock items support quick shipment once payment is confirmed. Air freight service is available for urgent emergency breakdown orders. Sea consolidation and full-container transport plans help overseas bulk purchasers cut comprehensive logistics costs.
Factory Production Strength
Our manufacturing plant focuses on R&D and mass production of aftermarket hydraulic spare parts for Japanese mini excavators, including axial piston main pumps, pilot pumps and matching hydraulic accessories. We have complete production workflows: alloy steel precision machining, surface heat treatment, component assembly and finished-product hydraulic bench validation. Simulated frequent start-stop cyclic durability tests are carried out to verify part durability under real-world landscaping and small civil construction environments. Our spare parts are exported to multiple overseas markets and maintain long-term stable cooperation with global construction machinery spare part wholesalers.
Frequently Asked Customer Questions
Q1: Can this 4466797 PVK-2B-505-N hydraulic pump fit other Hitachi excavator models?
A1: Cross-model installation is not recommended. Different main pumps vary in shaft spline, displacement and oil port arrangement. Please double-check machine model and original part number before placing orders.
Q2: What hydraulic faults can this main pump solve?
A2: It resolves malfunctions caused by internal component wear: insufficient digging power, slow compound movements, high hydraulic oil temperature, internal leakage, abnormal pump noise and insufficient load capacity.
Q3: Is tiered discount available for bulk quantity orders?
A3: Yes, preferential price depends on purchase volume. Full-container sea freight arrangement can be supported to reduce total logistics expense.
Q4: What export-grade packaging is used for long-distance overseas transit?
A4: Anti-rust oil is applied on all precision mating surfaces. The pump is wrapped with waterproof anti-rust film and shock-absorbing foam, then fixed inside reinforced plywood case, protecting precision internal components from collision and rust during long ocean shipping.