XPI25-0523800 Hydro Leduc Bent Axis Piston Pump for Truck

Product Overview

The XPi series bent-axis fixed displacement piston pumps are a flagship product line from Hydro Leduc (France), succeeding the renowned XP and X series. Featuring bent-axis technology with a 7-piston design incorporating synchronous主轴盘 and cylinder barrel assemblies, this series is specifically optimized for truck PTO (power take-off) hydraulic lifting systems. Designed to fully comply with Hydro Leduc XPi series mounting and interface standards, these pumps offer 100% direct interchangeability with original Hydro Leduc units—enabling plug-and-play replacement without any管路 modifications or adapter plates, significantly minimizing downtime and retrofit costs.

The XPi series is available in 10 displacement models, covering a wide range from 12 to 130 cc/rev. The XPI25 delivers 25 cc/rev displacement, a compact yet powerful member of the family. The series features a bidirectional rotation self-adaptive design—simply install the inlet fitting on the required side according to the PTO rotation direction, and the pump will automatically set itself to the correct direction. Every unit undergoes 100% factory testing under simulated real-world working conditions, validating pressure, flow, and sealing performance before shipment—ensuring reliable operation from the very first start.

Model Code Interpretation:

XPI25-0523800

• XPI – Series code: Bent-axis fixed displacement piston pump (truck application)

• 25 – Displacement size: 25 cm³/rev

• 0523800 – Product reference/part number

Technical Specifications 

XPI25-0523800

• Model: XPI25-0523800

• Type: Bent-axis fixed displacement piston pump

• Displacement: 25 cm³/rev

• Continuous Working Pressure: 380 bar (5,511 PSI)

• Peak Pressure (<5 seconds): 420 bar (6,092 PSI)

• Maximum Allowable Speed: 2750 r/min

• Piston Count: 7-piston design

• Maximum Absorbed Torque (@380 bar): 159 N·m

• Mechanical Efficiency: 95% (basis for maximum torque calculation)

• Weight (without inlet fitting): 9.3 kg

• Weight (with 2″ inlet fitting): 9.75 kg

• Overhang Torque (without inlet fitting): 8.84 N·m

• Overhang Torque (with 2″ inlet fitting): 9.26 N·m

• Housing Material: High-strength cast iron

• Mounting Standard: DIN ISO14 four-bolt flange, DIN 5462 splined drive shaft

• Rotation: Bidirectional (adjustable by repositioning inlet fitting)

• Suction Connection: FI 2″

• Discharge Connection: G 3/4″ BSP

• Medium: ISO VG32, ISO VG46 anti-wear hydraulic oil

• Operating Temperature Range: -20℃ to +90℃

• Recommended Fluid Cleanliness: ISO 4406 Class 18/15 or cleaner

Key Technical Advantages

1. 100% Direct Interchangeability – Zero Modification Required

The XPi series is engineered to exact Hydro Leduc mounting and interface specifications, with identical dimensions, port locations, and shaft end configurations. End users can replace original units directly without any管路 modifications or adapter plates—transforming unplanned downtime into scheduled, rapid maintenance while significantly reducing spare parts procurement costs and equipment downtime losses.

2. Bidirectional Rotation Self-Adaptive Design – Effortless Installation

The XPi series features a unique bidirectional rotation self-adaptive capability—simply install the inlet fitting on the required side according to the PTO rotation direction, and the pump will automatically set itself to the correct rotation. When the PTO turns counter-clockwise, the pump turns clockwise; when the PTO turns clockwise, the pump turns counter-clockwise. Whether the PTO turns clockwise or counterclockwise, the pump adapts with just a simple adjustment of the inlet fitting position. This intelligent design makes mounting and start-up easier than ever compared to conventional pumps.

3. Bent-Axis 7-Piston Design – High Speed with Low Pulsation

The bent-axis technology combined with a 7-piston design incorporating synchronous主轴盘 and cylinder barrel assemblies delivers smooth, low-pulsation flow. The 7-piston configuration effectively reduces flow pulsation, ensuring optimal flow regularity with low vibration and low noise during extended high-speed operation. The compact envelope, together with advanced technology, makes these pumps ideal for installation in tight spaces operating at relatively high rotating speeds.

4. High Contamination Resistance with Reinforced Sealing

The XPi series employs spherical piston friction pairs that adapt well to the poorer oil cleanliness often found in vehicle hydraulic systems, providing superior contamination resistance. The reinforced sealing structure effectively prevents oil leakage under frequent impact loads in vehicle hydraulic systems. High mechanical strength materials combined with innovative plate-barrel synchronization technology further enhance product reliability and service life.

5. Integrated Safety Protection with Compact PTO Mounting

Continuous working pressure reaches 380 bar, with instantaneous peak pressure up to 420 bar. The compact design allows direct flange mounting on the PTO, making it especially suitable for truck chassis with extremely limited installation space. An optional integrated bypass valve provides protection during engine start-up or system overload conditions.

6. 100% Factory Testing Under Simulated Working Conditions

Every XPi series unit undergoes rigorous factory testing under simulated real-world conditions, validating continuous pressure, peak pressure, flow output across the full speed range, volumetric efficiency, and sealing performance. Test media match actual operating conditions, ensuring each unit is ready for immediate installation and reliable operation upon delivery—eliminating the risk of “dead on arrival” components.

Application Areas

The XPi series bent-axis piston pumps are specifically optimized for truck and commercial vehicle hydraulic systems, widely deployed across the following applications:

• Dump Trucks: Body lifting hydraulic systems, hook-lift loaders, skip loaders

• Truck-Mounted Cranes: Truck cranes, forestry crane hydraulic lifting systems

• Sanitation Vehicles: Garbage compactors, street sweepers

• Municipal Specialty Vehicles: Various PTO-driven hydraulic systems, stabilization cylinders

• Snow & Ice Equipment: Spreaders, snow blades, snow turbines

• Fire Trucks: Fire vehicle hydraulic systems

• Military Vehicles: Military specialty vehicles

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness Management

The XPi series utilizes precision piston and cylinder bore interfaces that are sensitive to fluid contamination. It is recommended to install filters with ≤10μm filtration rating, maintaining fluid cleanliness to ISO 4406 Class 18/15 or better. ISO VG32 or ISO VG46 anti-wear hydraulic oil is recommended.

2. Rotation Direction Confirmation and Inlet Fitting Installation

The XPi series features bidirectional rotation self-adaptation. During installation, always install the inlet fitting on the correct side according to the actual PTO rotation direction. When the PTO turns counter-clockwise, the pump must turn clockwise; when the PTO turns clockwise, the pump must turn counter-clockwise. Verify the direction before installation to avoid cavitation or damage from incorrect setup.

3. Inlet Line and Suction Conditions

Ensure the inlet line has adequate diameter (FI 2″) with no sharp bends or restrictions. As a fixed displacement pump, suction conditions directly affect volumetric efficiency and service life. Keep the inlet line as short and straight as possible to avoid cavitation.

4. Pre-Start Checks

Before initial start-up or after extended shutdown, check that all connections are secure and oil level is adequate. It is recommended to rotate the shaft manually for several revolutions to ensure the pump is properly lubricated before starting.

5. Bypass Valve Function Confirmation

If the system is equipped with a bypass valve, verify its proper function before initial operation. The bypass valve provides protection during engine start-up or system overload conditions.

6. Periodic Inspection and Maintenance

Inspect the pump body for leakage and listen for abnormal operating noise every 1,000 operating hours or every 6 months (whichever comes first). If reduced flow output or insufficient pressure is observed, timely overhaul of the piston assembly and valve plate is recommended. Pay attention to the sealing condition at the inlet fitting to prevent air ingestion into the system.