Pompe hydraulique Komatsu K3V112S-1NCJ pour midi pelle Hitachi EX120-2 EX120-3 PC120-6

EX120‑2 EX120‑3 PC120‑6 Hydraulic Pump for Excavator spare parts K3V112S‑1NCJ Aftermarket

Product Brief

The K3V112S‑1NCJ variable axial piston main pump delivers core hydraulic power for classic 12‑ton class excavators, compatible with Hitachi EX120‑2, EX120‑3 and Komatsu PC120‑6. Converting engine mechanical torque into adjustable high‑pressure hydraulic flow, this unit supports earth excavation, site backfilling, ditch digging and multi‑action combined operations for older generation construction machines. This aftermarket replacement assembly is widely favored by overseas second‑hand equipment refurbishment shops, rental yards and cross‑border spare‑part distributors for direct pump swap and hydraulic system rebuild.

After long‑time service on rugged job‑sites, the original pump will suffer cylinder block scoring, piston shoe erosion and valve plate wear. Typical failure behaviors include insufficient digging thrust, slow boom and arm movement after oil temperature rises, weak traveling performance, continuous hydraulic oil overheating, harsh metallic squealing noise and obvious pressure drop under load. Sudden pump breakdown will force machine shutdown and bring unexpected repair expenditure for equipment owners.

Our aftermarket pump strictly complies with OEM dimensional standards for mounting flange, input shaft spline, regulator installation position and system pressure parameters. No cutting, drilling or extra adapter modification is required during field installation, greatly shortening machine stand‑by hours. As a practical cost‑saving substitute for expensive original pumps with long lead‑times, this assembly provides steady hydraulic output and meets bulk‑order purchasing demands for global excavator spare‑part suppliers handling older machine models.

Unique Product Competitive Advantages

1. High‑precision interchangeability for multi‑model 12‑ton excavator hydraulic system
Manufactured referring to original drawing specifications, this main pump keeps consistent shaft spline specs, oil port layout and regulator assembly dimension for the listed compatible models. Precisely processed friction assemblies effectively cut internal leakage after assembly. No secondary machining work is needed during on‑site replacement, helping mechanics finish pump swap efficiently for refurbished used machines.

2. Upgraded friction‑pair craftsmanship adapting to aged‑machine working characteristics
Many low‑cost alternative pumps degrade rapidly when matching old‑model hydraulic circuits with existing system wear. Our core internal components adopt carburizing quenching plus multi‑stage fine‑grinding treatment to strengthen wear‑resisting performance under alternating impact load. It helps fleet operators lower pump replacement frequency for heavily‑run EX120‑2, EX120‑3 and PC120‑6 machines.

3. Complete bench performance testing before shipment to prevent unexpected field shutdown
Each finished hydraulic pump goes through pressure endurance test, flow calibration and sealing leakage inspection on dedicated hydraulic test bench before packing. Defective goods are filtered out at factory side, easing re‑work burden for maintenance technicians and avoiding unplanned job‑site downtime losses.

4. Cost‑effective aftermarket solution for old‑equipment overhaul budget control
Genuine OEM pumps for these classic excavator models carry high purchase cost and hard‑to‑secure supply. Our factory‑direct aftermarket pump delivers dependable running stability and system compatibility, reducing annual overhaul expense for customers managing fleets of second‑hand construction machinery.

5. Multiple practical logistics options for global wholesale buyers
In‑stock products support quick dispatch once payment is confirmed. Air freight is available for urgent breakdown repair orders; consolidated sea freight and full‑container service offer cost‑saving choices for long‑term bulk importers handling second‑hand excavator spare‑parts.

Factory Production Strength

Our production base specializes in R&D and mass‑manufacturing of aftermarket hydraulic main pumps, travel gearboxes and swing motors covering multiple classic Japanese excavator series. We own complete production workflows: alloy‑steel forging, precision grinding, professional heat‑treatment and finished‑product hydraulic bench test. Professional simulation equipment reproduces real‑site variable‑load working status of mid‑size aged excavators to verify component durability. Our hydraulic spare parts are exported to multiple overseas regions and maintain long‑term stable cooperation with global construction‑machinery spare‑part wholesalers focusing on used‑machine components.

Frequently Asked Customer Questions

Q1: Can this K3V112S‑1NCJ main pump fit other excavator models besides EX120‑2, EX120‑3 and PC120‑6?
A1: Cross‑model fitment is not advised. Different main pumps differ in shaft spline, regulator parameters and pressure calibration values. Please double‑confirm machine model and original part number before submitting orders.

Q2: What hydraulic faults can this main pump resolve?
A2: It fixes failures caused by worn pistons, scratched valve plate and damaged inner assemblies: weak digging capacity, sluggish cylinder movements when oil warms up, high hydraulic oil temperature, internal leakage and abnormal squealing or knocking noise from main pump.

Q3: Am I eligible for volume‑based discount for large‑quantity orders?
A3: Yes, tiered preferential price is offered subject to purchase quantity. Full‑container sea shipment can be arranged to cut overall logistics expenditure.

Q4: What packaging is used for long‑distance overseas transportation?
A4: Anti‑rust oil is evenly coated on all metal surfaces. The whole pump is wrapped with waterproof shock‑absorbing PE film, then secured inside reinforced export‑grade plywood case, preventing collision deformation and moisture corrosion during long‑haul transit.