HPR105-02R Linde Axial Piston Pump 105cc 420bar

Product Overview

The HPR105-02R is a Linde HPR-02 Series open-circuit high-pressure swashplate-type axial variable displacement piston pump with a nominal displacement of 105 cm³/rev, rated working pressure of 420 bar (6092 psi), peak pressure of 500 bar (7250 psi), maximum speed of 2500 rpm, output flow of 157 L/min at 1500 rpm, maximum flow of 246.8 L/min, continuous input torque of 418 N·m, and weight of approximately 50 kg. The pump employs a swashplate-type axial piston variable mechanism, specifically designed for open-circuit high-pressure systems, with stepless displacement variation via swashplate angle adjustment and output flow proportional to drive speed and displacement.

The HPR105-02R is equipped with LP load sensing (LS) control with integrated pressure cut-off, precisely matching pump output flow to actual system demand, eliminating relief losses and significantly reducing system heat generation and energy consumption. The HPR-02 Series optionally features the SPU silencer unit, reducing system pressure pulsations by 70% without compromising pump functionality or efficiency. The SPU system provides self-adaptive noise reduction across the entire operating range, requiring no setup or maintenance — particularly suitable for mobile machinery applications with stringent noise control requirements.

The HPR-02 Series is Linde’s classic industrial hydraulic pump platform, covering displacements from 55 to 280 cm³/rev, with sizes including 55, 75, 95, 105, 135, 165, 210, 249, 280, and tandem pump versions 105D, 125D, and 165D. The series features the following core engineering characteristics: high-pressure swashplate axial piston pump for open systems, clockwise/counter-clockwise rotation options, excellent self-priming at high rated speeds, tank pressurization or swash angle reduction for high-speed applications, decompression fluid discharged via pump housing to keep suction side calm, exact and robust load sensing controllers, SAE high-pressure ports, SAE mounting flanges and ANSI/SAE splined shafts, through-shaft capability supporting SAE A/B/B-B/C/D/E flanges, and optional double and multiple pump configurations.

The pump is widely deployed in boom pump trucks, port machinery, offshore machinery, truck cranes, horizontal directional drills, snow removal vehicles, crawler cranes, excavators, and drill rigs. The HPR105-02R features mounting flange (SAE J744 127-2, SAE-C two-bolt), splined shaft, and port layouts conforming to Linde HPR-02 Series standards, enabling drop-in interchangeability with same-series HPR105-02L and other displacement sizes.

Every HPR105-02R undergoes 100% simulated duty-cycle testing prior to shipment — covering pressure holding, flow output, control response, and internal leakage — ensuring complete drop-in interchangeability with original Linde products without installation or plumbing modifications.

Technical Specifications

HPR105-02R Main Model Specifications:

• Model: HPR105-02R

• Brand: Linde

• Series: HPR-02 Series

• Pump Type: Open-circuit high-pressure swashplate axial variable displacement piston pump

• Nominal Displacement: 105 cm³/rev

• Rated Working Pressure: 420 bar (6092 psi)

• Peak Pressure: 500 bar (7250 psi)

• Maximum Speed: 2500 rpm (without pressurized reservoir)

• Maximum Flow: 246.8 L/min

• Output Flow at 1500 rpm: 157 L/min

• Continuous Input Torque: 418 N·m

• Maximum Input Torque: 702 N·m

• Continuous Power: 102.8 kW

• Maximum Power: 172.7 kW

• Control Type: LP load sensing + pressure cut-off

• Direction of Rotation: R (clockwise, viewed from shaft end)

• Mounting Flange: SAE J744 127-2 (SAE-C two-bolt)

• Shaft Type: SAE involute splined shaft

• Through-Drive Capability: Yes, SAE A/B/C/D/E flanges

• Swashplate Angle: 21°

• Housing Material: High-strength cast iron

• Weight: Approx. 50 kg (case drained)

• Allowable Case Pressure: 2.5 bar

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

• Operating Viscosity Range: 10–1000 cSt (optimum 20–60 cSt)

• Recommended Fluid: ISO VG32 / VG46 / VG68 anti-wear hydraulic oil

• Mounting Standard: ISO 3019-2 / SAE J617A

HPR-02 Series Same-Family Displacement Reference:

• HPR55: 55 cm³/rev, 420 bar rated, 500 bar peak, max 2700 rpm, max flow 148.5 L/min, torque 368 N·m, weight approx. 39 kg

• HPR75: 75.9 cm³/rev, 420 bar rated, 500 bar peak, max 2500 rpm, max flow 189.8 L/min, torque 507 N·m, weight approx. 39 kg

• HPR95: 94.7 cm³/rev, 350 bar rated, 420 bar peak, max 2500 rpm, max flow 237.5 L/min, torque 528 N·m, weight approx. 44.5 kg

• HPR105: 105 cm³/rev, 420 bar rated, 500 bar peak, max 2500 rpm, max flow 246.8 L/min, torque 702 N·m, weight approx. 50 kg

• HPR135: 135.7 cm³/rev, 420 bar rated, 500 bar peak, max 2350 rpm, max flow 312.1 L/min, torque 907 N·m, weight approx. 65 kg

• HPR165: 163.6 cm³/rev, 350 bar rated, 420 bar peak, max 2400 rpm, max flow 392.6 L/min, torque 911 N·m, weight approx. 74 kg

• HPR210: 210.1 cm³/rev, 420 bar rated, 500 bar peak, max 2100 rpm, max flow 441.2 L/min, torque 1404 N·m, weight approx. 116 kg

• HPR280: 281.9 cm³/rev, 420 bar rated, 500 bar peak, max 2000 rpm, max flow 563.8 L/min, torque 1884 N·m, weight approx. 165 kg

Data based on Weichai Hydraulics / LHY Powertrain HPR-02 Series official technical specifications.

Control Options:

• LP: Load sensing + pressure cut-off

• H1L: Load sensing + hydraulic ΔpLS override

• E1L: Load sensing + electrical ΔpLS override

• LEP: Load sensing + electric stroke limiter + pressure cut-off

• ETP: Electro-proportional + hyperbolic power limiter + pressure cut-off

• TL2: Load sensing + hyperbolic power limiter

Key Technical Advantages

1. 420 bar High-Pressure Capability and High Power Density — Industry-Leading Power Density Ratio

The HPR105-02R delivers a rated working pressure of 420 bar and peak pressure of 500 bar, with power density leading among comparable open-circuit variable piston pumps. The 105 cm³/rev displacement combined with 2500 rpm maximum speed provides maximum flow of 246.8 L/min, continuous input torque of 418 N·m, and continuous power of 102.8 kW, delivering robust hydraulic power output within a compact installation envelope. The swashplate axial piston design with optimized rotary group achieves efficient power transmission in a compact structure, weighing only approximately 50 kg with high power density ratio, meeting the hydraulic demands of boom pump trucks, port machinery, and other heavy-duty mobile machinery.

2. LP Load Sensing Control — On-Demand Flow Distribution and System Energy Savings

The HPR105-02R features LP load sensing control with integrated pressure cut-off, precisely matching pump output flow to actual system demand, eliminating relief losses. The load sensing function dynamically adjusts pump displacement by sensing actuator load pressure, supplying only the flow and pressure required by the system. Combined with Weichai hydraulic directional valves and control systems, this control method forms a machining LSC synchronous control system, achieving on-demand flow distribution with no overflow loss for system energy efficiency. The exact and robust load sensing control makes the pump particularly suitable for excavators, drill rigs, and other mobile hydraulic systems requiring coordinated control of multiple actuators.

3. SPU Silencer Unit — Adaptive Quiet Technology with 70% Pressure Pulsation Reduction

The HPR-02 Series optionally features Linde’s patented SPU silencer unit, which reduces system pressure pulsations by 70% by optimally connecting an additional volume directly next to the commutation area of the pump, without compromising pump functionality or efficiency. The SPU system provides self-adaptive noise reduction across the entire operating range, unaffected by pressure, speed, or temperature changes, requiring no setup or maintenance. This feature provides significant advantages for meeting increasingly stringent mobile machinery noise emission regulations, particularly suitable for municipal vehicles, snow removal vehicles, and other applications with strict noise control requirements.

4. Excellent Self-Priming Performance and High-Speed Capability — Flexible Transmission Installation

The HPR-02 Series delivers excellent self-priming at high rated speeds, with optimized inlet channel design enabling stable operation within the rated speed range without pressurized reservoir. Users can further increase maximum rated speed through tank pressurization or swash angle reduction. The pump features SAE involute splined shaft and SAE J744 127-2 mounting flange, supporting through-drive capability (SAE A/B/B-B/C/D/E flanges) for tandem installation of gear pumps or same-series piston pumps in double pump configurations. Decompression fluid is discharged via pump housing to keep suction side calm, ensuring adequate suction at high speeds to prevent cavitation damage.

5. Exceptional Field Interchangeability and Series Selection

The HPR105-02R features mounting flange (SAE-C two-bolt), SAE involute splined shaft, and port layouts conforming to Linde HPR-02 Series standards, enabling drop-in interchangeability with same-series HPR105-02L (left-hand rotation) and HPR55, HPR75, HPR135, HPR165, HPR210, HPR280 displacement sizes. The HPR-02 Series covers a wide displacement range of 55–280 cm³/rev within a shared mounting flange system, offering LP, H1L, E1L, LEP, ETP, and TL2 control options, as well as double and multiple pump configuration options for flexible selection in system design and equipment maintenance. The series interfaces perfectly with Linde LSC control valves and LinTronic electronic control systems for system-level precise control.

Application Areas

• Boom Pump Trucks: Pumping system hydraulic power source, with 420 bar high pressure meeting pumping conditions

• Port Machinery: Reach stacker and container handler hydraulic power systems

• Truck Cranes: Crane swing, hoist, and telescoping hydraulic systems

• Horizontal Directional Drills: Drilling and pullback hydraulic power sources

• Crawler Cranes: Crawler crane travel and hoist hydraulic systems

• Snow Removal Vehicles: Snow removal vehicle working device and travel hydraulic systems, with SPU silencer reducing operating noise

• Offshore Machinery: Offshore operation equipment hydraulic power systems

• Excavators: Medium excavator main hydraulic pumps, with LP load sensing control enabling on-demand flow distribution

• Drill Rigs: Rotary drilling rig and drill jumbo hydraulic power units

• Material Handling: Fuchs MHL340 and other material handler hydraulic systems

The HPR105-02R is ideally suited for heavy-duty open-circuit hydraulic systems requiring 420 bar continuous working pressure and displacements in the 105 cm³/rev range — the classic configuration for boom pump truck and port machinery hydraulic power units.

Expert Maintenance Tips

1. Shaft Alignment and Coupling Requirements

Maintain concentricity between the pump shaft and drive shaft within 0.05 mm. Flexible couplings are strongly recommended to accommodate minor angular misalignment. The HPR105-02R weighs approximately 50 kg — use appropriate lifting equipment during installation and never strike the shaft end. Tighten SAE J744 127-2 (SAE-C two-bolt) mounting flange bolts in diagonal sequence to the specified torque. The SAE involute splined shaft engagement with the drive coupling should ensure sufficient spline engagement length. Couplings must be equipped with protective guards. Motor-to-pump shaft alignment should be checked after installation and again after 500 hours of operation.

2. Pre-Start Priming Procedure (Mandatory)

Before initial startup, the pump must be slowly filled through the case drain port with clean hydraulic oil to ensure adequate lubrication, cooling, and sealing during startup. Operating an axial piston pump dry — even for a few seconds — will score the swashplate, valve plate, and piston slippers, causing immediate total pressure loss and irreversible damage. Start the pump in jog mode until the pump and piping are sufficiently filled and vented. After complete venting, run at low pressure for 5–10 minutes, check piping and component tightness, then gradually increase to rated pressure. ISO VG32 / VG46 / VG68 anti-wear hydraulic oil is recommended, with operating viscosity range of 10–1000 cSt (optimum 20–60 cSt) and operating oil temperature of -20℃ to +90℃.

3. LP Load Sensing Controller Commissioning

Commission the LP load sensing controller ensuring coordination between load sensing differential and pressure cut-off settings. The pressure cut-off setting should be at least 10–15 bar below the system relief valve setting. The load sensing differential should be adjusted according to actual system requirements. During commissioning, first turn the pressure setting screw to the lowest pressure position, then gradually increase to the target pressure. Adjustment must be performed with the pump at full displacement and low operating pressure to avoid system pressure oscillation. In multi-pump systems, stagger the controller settings to ensure proper power distribution.

4. Case Drain Line and Case Pressure Control

The case drain line should be independently routed to the reservoir, avoiding shared return lines. The HPR-02 Series allowable case pressure is 2.5 bar. Drain line diameter should be sufficiently large to ensure free drainage under cold-start high-viscosity conditions. The pump discharges decompression fluid via the pump housing to keep the suction side calm; the case drain line design should ensure case pressure does not exceed allowable limits. Installing a pressure gauge or sensor on the drain line is recommended to monitor case pressure status.

5. Restart Procedure After Extended Shutdown

If the pump has been idle for more than 30 days, manually rotate the shaft several turns to verify free rotation before restarting. Check for abnormal leakage at the case drain port. After startup, operate at low pressure for 10–15 minutes until oil temperature reaches normal operating range before applying full load. Regularly inspect the splined shaft and drive coupling engagement during operation, ensuring sufficient spline engagement length. When using the SPU silencer unit, verify that the adaptive noise reduction function operates correctly across the entire operating range.