Kawasaki HPV145 Hydraulic Pump: Complete Specifications, Applications & Buying Guide (2026)

August 18, 2026

Author

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Guangzhou Rito Hydraulic Co.,Ltd., located in Guangzhou, China, is a leading manufacturer and distributor of hydraulic pumps, final drives, swing motors, and main control valves for earthmoving machinery. We supply genuine, OEM, and high-quality aftermarket parts.

We are committed to continuously sharing our expertise regarding construction machinery and excavator hydraulic systems. Our goal is to help you gain a deeper understanding of equipment principles and applications—enabling you to work more efficiently—while also showcasing our professional knowledge and capabilities. We invite you to learn more about us.

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Marie R. Winters

Quick Answer

The Kawasaki HPV145 is a variable-displacement, swash-plate axial piston hydraulic pump with a nominal displacement of 145 cc/rev and a maximum operating pressure of 350 bar. It is the main hydraulic pump for Hitachi 30-ton-class excavators, including the EX300-2 / EX300-3 / EX300-5 and ZAX330 / ZX330 / ZX330-3 models. It is supplied either as a single pump or as a complete assembly (twin-pump unit); the single pump weighs approx. 85 kg (packing 54 x 35 x 51 cm) and the assembly approx. 225 kg (packing 64 x 59 x 74 cm). Buyers must specify the machine version (ZX330 without common rail vs ZX330-3 with common rail) because mounting and configuration differ. Known for mining-duty durability, stable high-pressure output, and long service life, the HPV145 remains one of the most demanded main pumps in the excavator aftermarket.

Key Takeaways

Variable-displacement swash-plate axial piston pump: 145 cc/rev, max pressure 350 bar.
Main pump for Hitachi 30-ton class: EX300-2 / EX300-3 / EX300-5, ZAX330, ZX330, ZX330-3.
Supplied as single pump (approx. 85 kg / 54 x 35 x 51 cm) or complete assembly (approx. 225 kg / 64 x 59 x 74 cm).
ZX330 (without common rail) and ZX330-3 (common rail) versions differ in mounting and configuration - always specify.
Common failure signs: noise, slow/weak movements, overheating, pressure drop - usually swash plate, pistons/slippers, port plate or seal wear.
Buy new, rebuilt or repair parts; check machine model and pump serial number before ordering; freight is weight-based (85 kg vs 225 kg).

Introduction: Why the HPV145 Matters for 30-Ton Hitachi Excavators
HPV145 Pump Specifications (Full Technical Data)
HPV145 vs K3V112 vs K3V140: Comparison Table
Applications: Which Hitachi Excavators Use the HPV145
Single Pump vs Assembly Pump: What Are You Buying?
Genuine vs OEM vs Aftermarket vs Rebuilt: How to Choose
Common HPV145 Problems & Practical Fixes
Hydraulic Pump Maintenance & Service Tips
Buying Guide: What to Check Before Buying an HPV145
Real-World Case Study: HPV145 Supply for Hitachi ZX330 (Export Project)
FAQ - HPV145 Hydraulic Pump
Conclusion: Get the Right HPV145 for Your Machine

1. Introduction: Why the HPV145 Matters for 30-Ton Hitachi Excavators

Role: the HPV145 is the main (variable) hydraulic pump that feeds the entire hydraulic system of 30-ton Hitachi excavators - travel, swing, boom, arm and bucket.
2026 reality: EX300 / ZAX330 / ZX330-era machines are at rebuild age; main pumps and repair kits are high-demand SKUs.
What this guide covers and who it is for (owners, workshops, parts buyers).
Built on first-hand export experience - HPV145 single pumps and assemblies supplied for ZX330-class machines.

2. HPV145 Pump Specifications (Full Technical Data)

Parameter	Value
Model	Kawasaki HPV145 (also manufactured under license by Handok)
Type	Variable-displacement swash-plate axial piston pump
Displacement	145 cc/rev
Max Operating Pressure	350 bar
Control	Hydraulic / pilot pressure control (per machine)
Application Class	30-ton excavators
Single Pump Weight	approx. 85 kg
Single Pump Packing	approx. 54 x 35 x 51 cm
Assembly Pump Weight	approx. 225 kg
Assembly Pump Packing	approx. 64 x 59 x 74 cm
Typical Machines	Hitachi EX300-2/3/5, ZAX330, ZX330, ZX330-3

How to read the pump nameplate and serial number before ordering any parts.

3. HPV145 vs K3V112 vs K3V140: Comparison Table

Pump Model	Displacement	Max Pressure	Application Class	Typical Machines
HPV145	145 cc/rev	350 bar	30-ton excavators	EX300, ZAX330, ZX330
K3V112	112 cc/rev	~350 bar	20-22 ton excavators	20-ton class machines
K3V140	140 cc/rev	~350 bar	25-30 ton excavators	Mid-large excavators

Why displacement and pressure matching matter: the pump must deliver the flow and pressure the machine's hydraulic system demands - using the wrong size means slow cycles or overload.

4. Applications: Which Hitachi Excavators Use the HPV145

Machine	Series	Pump Fit
Hitachi EX300-2	-2	HPV145
Hitachi EX300-3	-3	HPV145
Hitachi EX300-5	-5	HPV145
Hitachi ZAX330	Zaxis	HPV145
Hitachi ZX330	Zaxis-3 (without common rail)	HPV145
Hitachi ZX330-3	Zaxis-3 (common rail)	HPV145

Key selection point: the engine version (Isuzu 6HK1 mechanical vs 6HK1-TCS common rail) affects pump mounting and configuration - always confirm the model year before ordering.
How to confirm your machine version: serial number + engine data plate cross-check.

5. Single Pump vs Assembly Pump: What Are You Buying?

Item	Single Pump	Assembly Pump
What It Is	One variable pump unit	Complete twin-pump assembly
Weight	approx. 85 kg	approx. 225 kg
Packing Size	approx. 54 x 35 x 51 cm	approx. 64 x 59 x 74 cm
Best For	Replacing one failed unit	Full main pump replacement
Freight	Air freight feasible	Sea freight usually more economical

How to decide: failure scope, machine condition, budget, and required lead time.

6. Genuine vs OEM vs Aftermarket vs Rebuilt: How to Choose

Tier	Price	Warranty	Lifespan	Best For
Genuine (Kawasaki)	Highest	Best	Longest	New machines, critical/insured jobs
OEM (licensed manufacturers)	High	Good	Long	Quality-first buyers, fleets
Aftermarket	Medium	6-12 months typical	Medium	Cost-sensitive owners, older machines
Rebuilt / Reman	Varies	Varies by supplier	Depends on core condition	Fast replacement, budget rebuilds

Decision framework by machine age, working hours, and criticality of the job.

7. Common HPV145 Problems & Practical Fixes

Noise / whining: cavitation, worn bearings or swash plate - check suction line, oil level and filters first.
Slow or weak boom/arm movements: swash plate or piston/slipper wear, internal pressure loss.
Overheating hydraulic oil: internal leakage, worn port plate, wrong oil viscosity.
Pressure drop or erratic operation: regulator/control valve issues, worn pistons.
Oil leaks from the shaft seal: worn seal or scored shaft - repair early before contamination spreads.
Quick diagnosis checklist: oil level/filters, pressure readings, pump noise, oil temperature.

8. Hydraulic Pump Maintenance & Service Tips

Oil cleanliness is the #1 factor for pump life - keep oil and filters within the specified ISO cleanliness class.
Check hydraulic oil level and temperature daily.
Monitor system pressure settings and pilot pressure during service.
Change filters on schedule and use the correct oil viscosity for your climate.
Repair early, not late: address noise or slow action before internal damage turns a repair into a replacement.

9. Buying Guide: What to Check Before Buying an HPV145

New vs rebuilt vs used pump: pros, cons, typical price ranges (state ranges as market estimates).
Single vs assembly decision: 85 kg vs 225 kg - plan freight accordingly (air vs sea).
Pre-purchase checks: machine model/year, engine version (common rail or not), pump nameplate/serial number, mounting type.
Repair kit contents: plates, pistons, seals, bearings - confirm part numbers with the supplier.
Commercial terms: warranty, test report, packing and Incoterms for export buyers.

10. Real-World Case Study: HPV145 Supply for Hitachi ZX330 (Export Project)

RITO HYDRAULIC supplies HPV145 main pumps for Hitachi ZX330 / ZX330-3 excavators. Key product data: single pump approx. 85 kg (packing 54 x 35 x 51 cm); complete assembly approx. 225 kg (packing 64 x 59 x 74 cm). The pumps are built for mining duty, with stable high-pressure output, excellent wear resistance, precise and smooth control, and long service life.

Based on our export experience, buyers replacing a failed HPV145 should verify the following before ordering:

Machine model and year (EX300 / ZAX330 / ZX330 / ZX330-3).
Engine version - ZX330 without common rail vs ZX330-3 with common rail (mounting differs).
Pump nameplate and serial number.
Single pump vs complete assembly per failure scope.
Quality tier (genuine / OEM / aftermarket / rebuilt), warranty and test report.
Freight plan based on weight (85 kg vs 225 kg); payment terms and lead time.

11. FAQ - HPV145 Hydraulic Pump

1. What excavators use the HPV145 pump?

The HPV145 is the main pump for Hitachi 30-ton-class excavators: EX300-2 / EX300-3 / EX300-5, ZAX330, ZX330 and ZX330-3.

2. What is the HPV145 displacement and max pressure?

It is a variable-displacement swash-plate axial piston pump with 145 cc/rev displacement and a maximum operating pressure of 350 bar.

3. Is the HPV145 the same as a K3V pump?

Both are Kawasaki swash-plate piston pumps, but they differ in size and application: the HPV145 (145 cc/rev) serves 30-ton machines, while K3V112 (112 cc/rev) and K3V140 (140 cc/rev) serve 20-30 ton classes. Never swap without checking flow demand.

4. What is the difference between a single pump and an assembly pump?

A single pump is one variable pump unit (approx. 85 kg); an assembly is the complete twin-pump unit (approx. 225 kg). Choose based on failure scope and machine condition - a full replacement normally needs the assembly.

5. Why is the ZX330-3 common-rail version different?

The ZX330 uses a mechanical-injection Isuzu 6HK1, while the ZX330-3 uses the 6HK1-TCS common-rail engine. The pump mounting and configuration differ between the two, so always specify your machine version when ordering.

6. What are common HPV145 failure symptoms?

Typical signs are noise or whining, slow or weak boom/arm movements, overheating oil, pressure drop, and shaft seal leaks. These usually point to swash plate, piston/slipper, port plate or seal wear.

7. What does an HPV145 repair kit include?

A complete repair kit covers plates, pistons, seals and bearings for the pump. Confirm the part numbers against your pump serial number before ordering.

8. How much does an HPV145 pump cost (new / rebuilt)?

Prices vary by quality tier (genuine / OEM / aftermarket / rebuilt) and by region. Request a quote with your machine model, year and pump serial number for accurate pricing.

9. How do I check the HPV145 pump serial number?

The pump nameplate shows the model code and serial number. Cross-check it with your machine model and year to confirm the correct version (common rail or not).

10. Where can I buy an HPV145 pump or parts?

RITO HYDRAULIC supplies HPV145 single pumps, complete assemblies and genuine / OEM / aftermarket repair parts with export packing, test reports and warranty. Send your machine model and pump serial number for a quote.

12. Conclusion: Get the Right HPV145 for Your Machine

Every HPV145 buyer faces three decisions: confirm the machine version (ZX330 or ZX330-3, common rail or not), choose single pump vs complete assembly, and pick the right quality tier - then plan the freight (85 kg vs 225 kg). With correct specifications and a reliable supplier, your excavator will be back to work quickly and economically.

Request a quote today - send your machine model, year and pump serial number to RITO HYDRAULIC for pricing, warranty, test report and lead time on HPV145 pumps and parts.

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