Nachi

About Nachi Hydraulic Equipment

Nachi-Fujikoshi Corp. is one of Japan's most technically distinguished precision manufacturing companies, with a corporate history stretching back to 1928. Founded in Toyama Prefecture, Japan — a region historically associated with Japan's pharmaceutical and precision manufacturing industries — Nachi began as a manufacturer of cutting tools and precision machine tools, developing an early reputation for the engineering precision and metallurgical expertise that would define the company's products and culture for nearly a century. The Nachi name is derived from the famous Nachi waterfall in Wakayama Prefecture — one of Japan's tallest and most iconic waterfalls — a name chosen to evoke the power, precision, and enduring reliability that the company sought to embed in every product it manufactured.

From its origins in precision cutting tools, Nachi expanded its engineering capabilities over the following decades into three closely related technical domains — precision bearings, hydraulic equipment, and industrial robots — each of which leverages the same core competencies in precision manufacturing, metallurgy, and mechanical engineering that Nachi developed through its cutting tool heritage. This multi-domain engineering capability gives Nachi a unique technical profile among Japanese industrial companies — the company that designs and manufactures the cutting tools used to machine precision components also designs and manufactures the bearings that support rotating shafts, the hydraulic pumps and motors that power industrial machinery, and the robots that perform precision assembly tasks in manufacturing facilities worldwide.

Nachi's hydraulic equipment division — producing hydraulic pumps, motors, valves, and cylinders for industrial and mobile equipment applications — draws directly on this precision manufacturing heritage. Nachi hydraulic components are engineered to the same exacting dimensional tolerances and material specifications that the company applies to its cutting tools and precision bearings, resulting in hydraulic pumps and motors that deliver exceptional volumetric efficiency, long service life, and reliable performance under the demanding duty cycles of construction and mining equipment operation.

Nachi hydraulic pumps and motors are fitted as standard equipment in excavators and heavy machinery from leading manufacturers including Hitachi, Doosan, Hyundai, and others — making Nachi one of the important hydraulic component brands across Australia's construction and mining equipment fleet. In particular, Nachi hydraulic components are widely fitted in Hitachi excavators — one of the most commonly operated excavator brands on Australian construction and mining sites — making access to quality Nachi hydraulic parts through a knowledgeable local supplier an important consideration for Australian Hitachi excavator owners and hydraulic repair specialists.

Nachi Hydraulic Parts We Supply

At Lucas Parts, we stock a comprehensive range of Nachi hydraulic parts and components to suit heavy construction, mining, and earthmoving equipment. Our Nachi hydraulic parts inventory includes:

• Hydraulic pump assemblies — complete Nachi main hydraulic pump assemblies for excavators and heavy equipment including PVD, PVK, and PZS series pump models
• Hydraulic pump repair kits — cylinder block kits, valve plate kits, piston and shoe kits, swashplate kits, bearing kits, and complete rebuild kits for Nachi hydraulic pumps
• Travel motor assemblies — complete Nachi travel motor assemblies for excavator and tracked equipment undercarriage drive systems
• Travel motor repair kits — piston and shoe kits, valve plate kits, brake disc kits, spring kits, and complete rebuild kits for Nachi travel motors
• Swing motor assemblies — complete Nachi swing motor assemblies for excavator upper structure rotation systems
• Swing motor repair kits — internal component repair kits for Nachi swing motor overhaul and rebuild applications
• Gear pumps — Nachi pilot gear pumps and charge pumps used in excavator hydraulic pilot control systems
• Control valve components — Nachi main control valve assemblies and individual spool, relief valve, and solenoid valve components
• Hydraulic pump and motor seals — shaft seals, O-ring kits, and complete seal kits for Nachi hydraulic pumps and motors
• Vane pumps — Nachi vane pump assemblies and repair kits for industrial hydraulic applications
• Regulator components — Nachi pump regulator assemblies and regulator repair kits for hydraulic pump flow and pressure control systems

Can't find the Nachi hydraulic part you need? Call our team on 1300 987 300 and we will source it for you.

Why Choose Lucas Parts for Nachi Hydraulic Parts?

• Australian stock — faster delivery, no lengthy international lead times on the most commonly required Nachi pump and motor components
• Competitive pricing — genuine and quality aftermarket Nachi hydraulic parts at competitive rates significantly below OEM dealer pricing
• Expert advice — our team understands Nachi hydraulic pump and motor series and can help identify the correct part number for your specific machine make, model, and pump serial number
• Full warranty — all Nachi hydraulic parts are inspected and covered before dispatch
• Minimise downtime — a failed Nachi hydraulic pump or travel motor can take your most productive excavator completely off site; we keep critical hydraulic components ready to ship so you can minimise repair turnaround time

Nachi Hydraulic Pump Technology — Precision Engineering for Heavy Equipment

Nachi's axial piston pump technology for construction equipment applications reflects the company's century-long heritage of precision manufacturing and metallurgical expertise. Nachi hydraulic pumps fitted in excavators are variable displacement axial piston units — in many applications configured as tandem assemblies with two pump units driven from a common driveshaft — that provide the main hydraulic flow for boom, arm, bucket, swing, and travel functions simultaneously. These pumps operate at system pressures typically ranging from 320 to 380 bar and shaft speeds of 1,800 to 2,200 RPM, demanding the extreme dimensional precision and material quality that Nachi's manufacturing heritage is built on.

A distinguishing characteristic of Nachi's approach to hydraulic pump engineering is the integration of the company's precision bearing and metallurgical expertise directly into pump component design. Nachi manufactures its own precision bearings — used in the rotating group of Nachi hydraulic pumps — to the same exacting standards as the precision bearings it supplies to the broader industrial market. This vertical integration of bearing manufacturing within the hydraulic pump design gives Nachi pumps a level of rotating group precision and consistency that contributes directly to their volumetric efficiency and service life performance.

When Nachi pump internal components wear beyond their serviceable limits — as they inevitably will after many thousands of operating hours under demanding construction and mining duty cycles — pump volumetric efficiency falls, resulting in reduced hydraulic flow, slower machine cycle times, increased fuel consumption, and ultimately complete pump failure if the underlying component wear is not addressed with quality repair components or a replacement pump assembly.

Nachi Hydraulic Components in Hitachi Excavators

Nachi hydraulic components have a particularly strong and longstanding presence in Hitachi Construction Machinery excavators — one of the most widely operated excavator brands on Australian construction and mining sites. Hitachi has specified Nachi hydraulic pumps, travel motors, swing motors, and gear pumps across a significant range of its ZX and EX series excavator models, making Nachi one of the most important hydraulic component brands for Australian Hitachi excavator owners and maintenance teams.

Commonly fitted Nachi hydraulic components in Hitachi excavators include main hydraulic pump assemblies in ZX200, ZX210, ZX240, ZX270, ZX300, ZX330, and ZX350 series machines, travel motor assemblies across the ZX series range, and pilot gear pump assemblies used in the hydraulic pilot control systems of Hitachi ZX series excavators. If your Hitachi excavator is fitted with Nachi hydraulic components, our team can help you identify the correct Nachi replacement assembly or repair kit from your machine's make, model, and pump serial number.

It is important to note that Hitachi excavators are fitted with hydraulic components from multiple suppliers across different model years and production periods — including Nachi, Kawasaki, and other Japanese hydraulic manufacturers. Correctly identifying which hydraulic component brand is fitted in your specific Hitachi excavator before ordering replacement parts or repair kits is essential to ensuring the correct parts are supplied. Our team can help confirm the hydraulic component brand and model fitted in your specific machine from your machine serial number and production date.

Nachi Hydraulic Components — Equipment Applications We Cover

Nachi hydraulic pumps, travel motors, and swing motors are fitted as standard equipment across a range of construction and mining equipment brands and models used in Australia, including:

• Hitachi — ZX130, ZX135, ZX160, ZX180, ZX200, ZX210, ZX225, ZX240, ZX270, ZX300, ZX330, ZX350, ZX400, ZX450, and ZX500 series excavators with Nachi hydraulic pump and motor components across selected model year and production variants
• Doosan — DX140, DX180, DX225, DX255, DX300, DX340, and DX380 series excavators with Nachi hydraulic components across selected production variants
• Hyundai — R140, R160, R180, R210, R235, R260, R290, and R300 series excavators with Nachi hydraulic pump and motor assemblies across selected variants
• Case — CX130, CX145, CX160, CX180, CX210, CX225, and CX240 series excavators with Nachi hydraulic components across selected production variants

If your excavator is fitted with Nachi hydraulic pumps or motors, our team can help you identify the correct replacement assembly or repair kit from your machine's make, model, serial number, and pump identification tag.

Diagnosing Nachi Hydraulic Pump and Motor Problems

Early and accurate diagnosis of Nachi hydraulic pump and motor problems is critical to preventing minor hydraulic issues from escalating into complete component failure. The most common symptoms of failing Nachi hydraulic components on heavy equipment include:

• Slow or sluggish machine movements — reduced hydraulic pump flow from internal wear or reduced volumetric efficiency causes slower boom, arm, bucket, and swing cycle times that experienced operators notice immediately
• Loss of digging force — reduced system pressure from a worn pump causes reduced bucket breakout force and arm crowd force under load
• Excessive hydraulic oil temperature — internal pump leakage from worn components generates heat rather than useful hydraulic work, causing oil temperature to rise above normal operating range
• Travel motor pulling to one side — unequal output from left and right Nachi travel motors due to wear difference or brake component wear causes machine drift during straight travel
• Noisy hydraulic pump operation — cavitation, aeration, or bearing noise from the Nachi pump area are audible indicators of developing pump problems
• Hydraulic oil metal contamination — metal particles in hydraulic oil from internal Nachi pump or motor wear are detectable through oil sampling and are one of the most reliable early warning indicators of developing hydraulic component wear

If you are experiencing any of these symptoms on your equipment, contact our team and we can help identify the correct Nachi replacement component or repair kit for your machine.

Repair vs Replace — Nachi Hydraulic Pumps and Motors

The decision between repairing a worn Nachi hydraulic pump or motor with an internal component kit versus replacing it with a new or remanufactured exchange unit is one of the most important cost decisions an equipment owner makes during a major hydraulic repair. Key factors that guide this decision include:

• Nature and extent of the failure — gradual internal component wear is repairable with a quality Nachi repair kit; catastrophic failure involving housing damage, shaft fracture, or severe bore scoring typically requires complete unit replacement
• Machine operating hours and condition — on a lower-hour machine, a quality repair is typically the most cost-effective solution; on a very high-hour machine where multiple hydraulic components may be approaching end of service life simultaneously, a complete remanufactured unit may offer better total value
• Repair workshop capability — Nachi hydraulic pump and motor repair requires specialised rebuild tooling, a contamination-free working environment, and technical knowledge of axial piston pump assembly procedures; repairs should only be undertaken by qualified hydraulic technicians
• Cost comparison for your specific model — for many common Nachi pump and motor models, quality repair kit cost is significantly lower than a new or remanufactured replacement unit; our team can provide pricing for both options so you can make an informed decision

Contact our team with your Nachi pump or motor model number, machine make and model, and a description of the failure symptoms and we will advise on the most practical and cost-effective repair or replacement solution for your specific situation.

Serving Construction and Mining Businesses Across Australia

Lucas Parts supplies Nachi hydraulic parts to customers in Melbourne, Sydney, Brisbane, Perth, Adelaide, Darwin, and regional Australia including mining regions in the Pilbara, Hunter Valley, Bowen Basin, and Goldfields. We work with hydraulic repair specialists, excavator workshop managers, civil contractors, mining operators, earthmoving companies, plant hire businesses, and equipment dealers who need reliable Nachi hydraulic component supply with fast turnaround.

Browse our full Nachi hydraulic parts catalogue or contact our team today to discuss your requirements.

Frequently Asked Questions — Nachi Hydraulic Parts

How do I identify the correct Nachi pump or motor for my machine?

The most reliable method is to locate the Nachi pump or motor model number and serial number from the identification tag on the component itself — typically a metal plate attached to the pump or motor housing. The Nachi model number — for example PVD-2B-40 or PZS-4B-100 — directly identifies the pump series and displacement, allowing accurate cross-referencing to the correct replacement unit or repair kit. Alternatively, providing your machine's make, model, serial number, and production year allows our team to identify the standard Nachi hydraulic component specification for your machine from the equipment application catalogue.

How do I know if my Hitachi excavator has Nachi or Kawasaki hydraulic pumps?

The most reliable way to confirm whether your Hitachi excavator is fitted with Nachi or Kawasaki hydraulic components is to physically locate and read the identification tag on the main hydraulic pump assembly — the tag will clearly identify the manufacturer as either Nachi or Kawasaki along with the specific pump model number. Alternatively, providing our team with your Hitachi excavator's serial number and production date allows us to identify the standard hydraulic component specification for your specific machine from Hitachi's production records. Never assume the pump brand from the machine model alone as Hitachi used both Nachi and Kawasaki hydraulic components across different production periods and variants of the same model series.

What causes Nachi hydraulic pump failure on excavators?

The most common causes of Nachi hydraulic pump failure on construction excavators in Australia are hydraulic oil contamination from infrequent oil and filter changes — which causes accelerated abrasive wear of precision pump internal components — cavitation from a blocked or restricted suction filter or suction line that starves the pump of adequate oil supply, aeration from a suction line air leak that introduces air bubbles into the pump oil supply, and operation with hydraulic oil that has degraded beyond its serviceable viscosity range due to heat cycling or extended service intervals. Contamination and cavitation account for the large majority of premature Nachi pump failures and are entirely preventable with correct hydraulic system maintenance practices.

Can a Nachi hydraulic pump be repaired rather than replaced?

Yes — in many cases, a worn Nachi hydraulic pump can be successfully repaired using a quality internal component kit that replaces the worn pistons, shoes, valve plates, cylinder block, and bearing assemblies within the existing pump housing. This repair approach is typically significantly more cost-effective than replacing the complete pump assembly when the pump housing, shaft, and port block are in serviceable condition and the failure is due to gradual internal wear rather than catastrophic damage. Successful pump repair requires specialised hydraulic pump rebuild tooling, a clean working environment free of contamination, and technical expertise in axial piston pump assembly procedures.

Do you supply remanufactured Nachi hydraulic pumps and motors?

Yes. In addition to new Nachi pump and motor assemblies and internal repair kits, we can supply premium remanufactured Nachi hydraulic pump and motor exchange units for many common excavator applications. Remanufactured Nachi units are rebuilt to OEM specifications using quality internal components and offer a cost-effective alternative to new units — typically at a lower cost than a new assembly but with full performance restoration and warranty coverage. Contact our team for availability and pricing of remanufactured Nachi pump and motor units for your specific machine application.

What is the difference between Nachi PVD and PZS pump series?

The Nachi PVD and PZS are both variable displacement axial piston pump series used in construction equipment hydraulic systems, but they differ in displacement range, pressure rating, and design configuration. The PVD series covers a range of smaller to mid-size displacement pump models, while the PZS series covers larger displacement models used in bigger excavators and heavier equipment. Both series use axial piston pump operating principles but have different internal component dimensions and specifications — repair kits and internal components are not interchangeable between the two series. Always confirm your specific Nachi pump model number before ordering repair kits or replacement components to ensure correct parts are supplied.

How long does delivery take?

Delivery timeframes depend on your location and whether the part is in local stock or needs to be sourced. We will always provide you with a clear lead time before you confirm your order so there are no surprises.

Are your Nachi hydraulic parts covered by a warranty?

Yes. All Nachi hydraulic parts supplied by Lucas Parts carry a warranty. Speak to our team for specific warranty terms applicable to the part you are purchasing.

Can I order Nachi hydraulic parts online?

Yes. You can browse and order through our website at lucasparts.com.au, or call us on 1300 987 300 for personalised assistance.