Bơm thuỷ lực dành cho máy đào cỡ vừa Hitachi ZX120-5G, ZX120-5A

ZX120-5G ZX120-5A Hydraulic Pump for Excavator spare parts Aftermarket

Product Brief

This aftermarket axial piston hydraulic main pump is specially engineered for Hitachi ZX120-5G and ZX120-5A medium-sized excavators. It transforms mechanical power output from the engine into high-pressure controllable hydraulic flow, delivering power to the whole hydraulic system to realize bucket digging, boom lifting, arm retraction, slewing movement and track travel. Widely deployed in urban utility projects, land reclamation, stone stockpiling and road base construction, this replacement pump is the preferred spare part for field repair shops, equipment rental companies and global excavator part traders to refurbish hydraulic systems and replace failed pumps.

When working continuously under heavy load for long periods, frequent compound actions and poor maintenance will contaminate hydraulic oil. This gradually causes scratches on the cylinder barrel, wear of piston shoes and valve plate, leading to increased internal leakage. Obvious warning signs include inadequate digging force, slow response when operating multiple functions at the same time, power drop under heavy digging load, sustained rise of hydraulic oil temperature, strange humming noise coming out of pump housing and delayed machine movement. Once internal components suffer severe damage, the hydraulic system will lose power, resulting in machine shutdown, high emergency repair costs and disruption to construction schedules.

Our aftermarket hydraulic pump is manufactured by closely following OEM technical drawings. The mounting flange size, drive shaft spline specification, oil port layout and pressure setting of regulator all match original standards. No cutting, drilling or gasket modification is required during on-site installation. Service technicians can finish pump replacement quickly to reduce machine downtime. Compared with expensive genuine pumps that often have long lead times, this hydraulic pump maintains stable hydraulic performance and supports bulk repeat orders for suppliers focusing on Hitachi medium excavator hydraulic components.

Product Highlights

1. Direct fit design to speed up hydraulic overhaul
All flange dimensions, oil port positions and drive shaft spline parameters are consistent with original specifications. Maintenance crews can complete pump replacement without secondary machining, improving overhaul efficiency for service centers and refurbished excavator projects.

2. Enhanced friction pair to cope with variable heavy-duty working conditions
Many low-cost generic pumps quickly lose volumetric efficiency when working with contaminated hydraulic fluid containing fine metal debris. Our core internal friction components adopt upgraded heat treatment and ultra-precision surface grinding technology, improving resistance to cavitation and wear, extending service life for ZX120-5G and ZX120-5A excavators working on medium earthmoving sites.

3. Comprehensive bench performance test before shipment
Every finished hydraulic pump goes through pressure holding test, flow calibration and noise inspection on dedicated hydraulic test bench before packing. Defective products are screened out at factory, lowering rework risks for maintenance teams and preventing sudden hydraulic breakdown on construction sites.

4. Economical aftermarket solution for medium excavator fleet maintenance
Genuine main pumps for Hitachi ZX120-5G and ZX120-5A are costly with unstable stock availability. Our factory direct replacement pump balances reliable hydraulic output and competitive pricing, helping equipment owners and repair shops cut overall fleet maintenance costs.

5. Diverse logistics options for bulk buyers
In-stock items support fast shipment after payment confirmation. Air freight can be arranged for urgent breakdown orders. Sea consolidation and full container transport help overseas bulk purchasers reduce total logistics expenses.

Factory Production Strength

Our factory focuses on the research, development and mass production of aftermarket hydraulic spare parts for Hitachi medium excavators, including axial piston main pumps, pilot pumps and matched hydraulic accessories. We have complete production workflows: precision machining of alloy steel, surface heat treatment, component assembly and hydraulic bench verification for finished products. Simulated cyclic durability tests under variable pressure are carried out to verify component durability under real road construction and quarry working environments. Our spare parts are exported to many overseas markets, and we maintain long-term stable partnerships with global construction machinery spare part wholesalers.

Frequently Asked Customer Questions

Q1: Can this 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 layout. Please confirm machine model and original part number before placing orders.

Q2: What hydraulic failures can this main pump fix?
A2: It solves faults caused by internal component wear: insufficient digging force, slow combined movements, high hydraulic oil temperature, internal leakage, abnormal pump noise and insufficient heavy-load capacity.

Q3: Will volume discount be offered for bulk orders?
A3: Yes, discounted price depends on purchase quantity. We can arrange full container sea freight to reduce logistics cost.

Q4: What export packaging is used for long-distance overseas shipping?
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 parts from collision and rust during long ocean transportation