Hitachi ZAX120-6 Main Hydraulic Pump – New Genuine (HPK055AT-18B / 9142497 / 9197338)

Note: The application information provided is for reference only. Please confirm the part number and compare it with the old component before purchasing. If you have any questions, please feel free to contact us.
It is worth choosing a product that features stable performance, high reliability, easy installation, and quick response.

1. Key Features & Benefits

• HPK055 series – Hitachi’s precision hydraulic platform – This pump (OEM 9142497 / 9197338, model HPK055AT-18B) is a variable displacement axial piston pump engineered by Hitachi for the ZAX120-6, ZX120, ZX135 and compatible 12–13 ton class excavators. It delivers the precise flow and high pressure required for fast cycle times, smooth multi-function operation, and reliable performance in heavy-duty construction environments.

• New genuine Hitachi OEM specification – This is a brand new, never-used main hydraulic pump, manufactured to Hitachi’s original factory standards. Not remanufactured, not rebuilt, not a generic aftermarket substitute. As an OEM-certified component, it meets Hitachi’s stringent standards for fluid efficiency, longevity, and seamless compatibility with ZX series excavators.

• High-pressure capability for demanding work – Rated pressure of 34.3 MPa (350 kgf/cm² / 4,975 psi) and maximum pressure of 39.2 MPa (400 kgf/cm² / 5,685 psi) for short-term peak loads. This pressure capability delivers consistent digging force, swing torque, and attachment power hour after hour in the most demanding applications.

• Substantial flow for 12–13 ton class machines – Displacement of 112 cc/rev per pump element. Maximum flow of approximately 264 L/min at 2,360 RPM, with rated flow of 240–250 L/min under typical load conditions. The pump’s maximum operating speed of 2,360 RPM is precisely matched to Hitachi’s 4JJ1 engine output.

• Corrosion-resistant metal construction – Built with a durable steel/aluminium alloy body that withstands extreme pressures and corrosion in harsh industrial environments. The complex, multi-port configuration ensures seamless integration into the hydraulic system.

• Integrated control for precision – Features an integrated control unit that enables real-time adjustments for optimal hydraulic performance and safety. This provides smooth, predictable machine response – critical for precision grading, trenching near utilities, and fine attachment control.

• Engineered for continuous operation – Rugged industrial design ensures uninterrupted performance during prolonged construction projects. With high-pressure tolerance and precise fluid control, the pump handles heavy-duty excavator operations efficiently.

• Direct bolt-on replacement for ZAX120-6 – Mounting flange, drive shaft spline, and hydraulic port configurations match original Hitachi specifications exactly. No modifications, no adapters – your mechanic unbolts the old pump and bolts this one in.

• Pre-shipment visual verification – We send you clear, high-resolution photographs of the actual pump (mounting flange, splines, port threads, castings) before packing. You approve – we ship. Never blind.

• Fast delivery – 5–8 working days from our Guangzhou warehouse. Monthly supply capacity of 300 units.

2. Applications

The new genuine Hitachi HPK055AT-18B main hydraulic pump is the power source for ZAX120-6 and 12–13 ton class excavators used across a wide range of demanding job sites:

• Urban construction & utilities – Sidewalk repairs, water and gas line trenching, fibre-optic cable installation, and small-scale demolition in tight access spaces. The pump’s integrated control unit provides precise, “fine-touch” flow for delicate digging near existing utilities, while the high-pressure capability (34.3 MPa) offers enough power for breaking compacted surfaces.

• Residential & commercial development – Foundation digging, basement excavation, retaining walls, grading, and site preparation. The pump’s smooth response and quiet operation are essential for noise-sensitive neighbourhoods. With flow rates up to 264 L/min, the machine maintains fast cycle times even in multi-function operations.

• Road & bridge construction – Shoulder repairs, drainage installation, guardrail replacement, and slope stabilisation. The pump’s ability to maintain consistent flow under varying loads ensures the excavator performs reliably throughout long shifts in exposed conditions.

• Quarrying & aggregates – Loading trucks, stockpile management, and material handling in abrasive dust conditions. The corrosion-resistant metal body withstands harsh environments, while the high-pressure tolerance ensures consistent performance even under extreme loads.

• Mining support – Site cleanup, road maintenance, drainage works, and equipment pad grading. A new genuine pump with zero hours and factory tolerances provides predictable service life (typically 6,000–8,000 hours) – avoiding costly unplanned downtime in remote mine sites.

• Equipment rental fleet – 12–13 ton excavators are among the most frequently rented machines. A new genuine pump eliminates the gamble of remanufactured or used units, offering predictable performance and reliability that keeps your machine on rent, not in the shop.

• Landscaping & agriculture – Pool excavations, irrigation trenching, pond maintenance, drainage ditch cleaning, and fence post holes. The pump’s adjustable flow characteristics provide the versatility needed for both delicate landscaping and heavy agricultural attachments.

3. Why Choose Hongtengda Parts

At Hongtengda Parts, we have been supplying genuine and remanufactured hydraulic components for excavators since 2001. We know that a main pump failure on your ZAX120-6 stops your job site completely. A new genuine pump is an investment in predictable production – not a gamble on someone else’s worn components.

• 25+ years of industry experience – Founded in 2001, we have supplied genuine Hitachi pumps and components to customers across Southeast Asia, the Middle East, Africa, the Americas, and Oceania. We know the ZAX120-6 platform inside out.

• 90% stock availability – Hitachi ZAX120-6 main pumps (HPK055AT-18B / 9142497 / 9197338) are in stock as new genuine units, ready for immediate dispatch from our Guangzhou warehouse.

• 24-hour shipment – From our Guangzhou hub to your forwarder in 1 day; international orders shipped within 24 hours.

• Professional export packaging – Heavy-duty fumigation-free wooden cases with internal bracing and foam padding for sea or air freight. No MOQ pressure – one piece is enough to place an order.

• Pre-shipment visual verification – We never ship a pump blind. You receive clear photos of the actual unit before packing – you approve, we ship.

• Technical support – Send us your ZAX120-6 machine serial number and a photo of the old pump. We confirm compatibility and provide installation guidance within 2 hours.

Critical installation tip for the HPK055AT-18B new pump:
– The case drain line must be clear and unrestricted. A blocked or kinked case drain will build back pressure inside the pump housing and blow the shaft seal instantly on first startup.
– Before installing the new pump, flush the entire hydraulic system and replace all filters. Contaminants from a failed pump will destroy a new pump just as quickly as an old one – debris does not discriminate.
– Use new O-rings and sealing washers on every hydraulic connection. Reused seals guarantee leaks.
– After installation, run the engine at low idle for 2–3 minutes with the pump in neutral, then slowly cycle each function (boom, arm, bucket, swing, travel) to purge air from the system.
– Check pump alignment with the engine flywheel housing – misalignment causes premature bearing wear and shaft seal leakage.

Warranty note: Warranty period is 3 to 6 months depending on product details. We do not provide warranty service for genuine original parts. Our value is delivered up front: genuine Hitachi components, new-condition pump, and pre-shipment visual verification. For customers who require a warranty-covered option, we can quote aftermarket alternatives – ask our sales team.

The main hydraulic pump is the heart of your ZAX120-6’s hydraulic system. A new genuine HPK055AT-18B from Hongtengda Parts gives you factory-fresh performance – not with worn components disguised as “rebuilt”, but with genuine Hitachi engineering. Send us your ZAX120-6 serial number – we will confirm compatibility and provide a quote within 24 hours.