Hitachi HPV118HW axial piston pump for Hitachi ZX250LCN-3 excavator
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Product Overview
This heavy‑duty dual‑variable axial piston main pump acts as the core hydraulic power source built for Hitachi ZX250LCN‑3 medium crawler excavator. Adopting HPV118HW structure with integrated pilot pump assembly, this complete pump unit supplies high‑pressure hydraulic oil to drive boom lifting, arm crowding, bucket excavation, track travel and upper‑body slew movements. This 25‑ton machine is widely applied in quarry loading, highway construction, large‑scale earth‑moving, foundation excavation and river regulation engineering projects. Under long‑duration heavy‑load working cycles, hydraulic oil contamination and thermal fatigue will gradually wear cylinder block, piston shoe assemblies, valve plate and drive shaft. Typical failure symptoms contain insufficient digging breakout force, sluggish compound operating actions, loud resonant noise originating from pump housing, continuous sharp rise of hydraulic oil temperature and persistent external seal oil seepage. Manufactured strictly following original installation dimensions and hydraulic performance curves, this replacement pump supports direct drop‑in installation, assisting repair depots and equipment owners to fully restore machine working efficiency without the excessive cost and extended lead‑time of genuine OEM pumps.
Core Advantages
1. Reinforced friction pair design for medium excavator heavy‑duty site operations
Critical matching components such as cylinder block, piston shoes and valve plate adopt high‑grade alloy raw material and multi‑stage thermal treatment process. Precision grinding tightly controls internal fitting clearance, effectively cutting internal leakage and unstable flow fluctuation. Outstanding anti‑cavitation performance ensures stable output even when hydraulic fluid carries fine impurity particles, delaying component wear under high‑load, dusty construction working conditions.
2. Pre‑commissioned load‑sensing regulator for real‑time load response
Each finished pump undergoes comprehensive pressure‑flow debugging on professional hydraulic test bench. Regulator parameter settings are highly consistent with original factory standards, which can quickly respond to load fluctuation during digging and loading cycles. The built‑in pilot pump delivers steady control pressure for joystick manipulation, effectively eliminating operating jitter and action lag caused by insufficient pilot pressure supply.
3. Duplicated original mounting layout to minimize equipment downtime
Mounting flange dimension, spline shaft specification, oil port arrangement and regulator installation positions are fully matched with original spare parts. Field maintenance technicians can finish pump replacement directly without altering pipeline layout or resetting complex hydraulic parameters. For large‑scale rental fleets and local repair centers, it greatly shortens machine stand‑still period and mitigates economic loss brought by equipment outage.
4. Robust housing structure and multi‑layer sealing protection mechanism
Integral high‑density cast iron housing absorbs strong pressure impulse and mechanical vibration generated during heavy‑load excavation and cyclic travelling. Premium combined sealing assemblies block high‑pressure hydraulic oil outward leakage, meanwhile prevent silt, gravel and moisture from invading pump inner cavity, protecting internal precision components against secondary abrasive damage.
5. Practical cost‑saving maintenance solution for medium‑size excavator fleets
Genuine original main pump comes with high procurement price and long order lead‑time. This aftermarket pump delivers reliable comprehensive performance at competitive price point. It becomes an ideal spare‑part sourcing option for repair workshops, equipment rental enterprises and global Hitachi medium excavator spare‑parts distributors.
Manufacturing & Quality Control
Our production facility specializes in manufacturing heavy‑duty hydraulic pump assemblies for Hitachi medium‑tonnage excavators. Full‑process quality supervision covers raw material incoming inspection, heat‑treatment hardness testing, critical dimension measurement, assembly inspection and finished‑product hydraulic bench test including pressure‑holding, flow output, noise detection and cyclic load simulation. Only fully qualified products can proceed to packaging workflow. Completed pumps are coated with anti‑rust preservation oil, wrapped with shock‑absorbing cushion materials and packed in export‑compliant fumigated wooden cases, avoiding scratch, deformation and rust deterioration during long‑distance sea‑land logistics. We support bulk wholesale, stable batch supply, small trial orders are acceptable for worldwide purchasers.
Frequently Asked Questions
Q1: What abnormal phenomena indicate main pump inspection or replacement?
A: If your Hitachi ZX250LCN‑3 excavator occurs weak digging power, slow combined movements, distinct abnormal noise around main pump, rapid hydraulic oil overheating, or metallic powder is detected inside hydraulic filter element, system pressure test and pump disassembly inspection should be performed promptly.
Q2: Will this hydraulic pump fit other Hitachi excavator models?
A: This assembly is designed for Hitachi ZX250LCN‑3. HPV118HW series pumps cover multiple related ZX‑3 series models, while displacement and internal regulator structures still differ among different machines. Please double‑check your original part number HPV118HW before placing order to prevent installation mismatch.
Q3: What essential points need attention during installation procedure?
A: Fully clean hydraulic oil tank, pipelines and oil cooler, install brand‑new hydraulic oil and all filter cartridges. Keep assembling environment clean to stop contaminants entering pump inner chamber. After installation completion, finish hydraulic system air exhaust and low‑speed no‑load running test before putting machine into formal construction operation.
Q4: Warranty scope explanation
A: Our warranty covers defects induced by manufacturing flaws. Damage resulting from contaminated hydraulic oil, improper installation, cavitation corrosion and long‑time overload service will not fall under warranty coverage. Please strictly comply with Hitachi official service manual during overhaul work.