H1P H1P078 H1P089 H1P100 H1P115 H1P130 H1P147 Open Circuit Axial Fixed Displacement Pump H1P089RAA4C2NF6HG1H6L45L45ML24PNNNNNN

I. Technical Parameters
Core performance parameters
– Pump type: Axial variable piston pump, swash plate heavy-duty structure, right-rotating steering, suitable for high-pressure open/closed dual-circuit hydraulic systems, supports independent adjustment of dual-circuit displacement, providing high-pressure differentiated oil supply for medium and heavy-duty dual actuators.
– Displacement and pressure parameters: Rated displacement 89 mL/r (marked with model “089”); Rated working pressure: 31.5 MPa, maximum allowable pressure: 35 MPa (for a duration of ≤10 seconds); Rated speed: 1500 r/min, maximum speed: 2000 r/min (short time ≤5 minutes).
– Flow and efficiency parameters: The maximum flow rate of a single circuit at the rated speed is 133.5 L/min, and the total flow rate of two circuits working simultaneously is ≤133.5 L/min (can be allocated as needed). Variable range: 0-133.5 L/min continuously adjustable. Volumetric efficiency ≥94%, total efficiency ≥86%.
– Operating characteristics: Continuous operating oil temperature ≤85℃, rated working condition inlet vacuum degree ≤ 0.02MPa; Noise value ≤80 dB (measured at 1 meter); The fault-free operating life is ≥ 15,000 hours (under rated conditions).
2. Structure and connection parameters
– Structural type: Swashplate axial plunger structure, integrating a double plunger cylinder body, a linked variable swashplate, a double return plate and a double built-in high-pressure relief valve; It adopts a combined control of constant power, constant voltage and load sensitivity, and supports dual-loop independent remote proportional regulation. Flange installation, equipped with dual high-efficiency oil suction filters and pressure compensation valves.
– Core material: The plunger is made of stainless steel 17-4PH (quenched and tempered, hardness HRC42-45); The cylinder block is made of alloy cast iron QT600-3 (aged treatment, hardness HB280-320). The swash plate is made of bearing steel GCr15 (quenched treatment, hardness HRC62-66). The sealing part is a combination of high-pressure resistant fluororubber and polytetrafluoroethylene (with a temperature resistance of ≤120℃).
– Connection specifications: The shared oil suction port (S) is a DN80 flange, and both oil outlet ports (P1/P2) are DN65 flanges. The drive shaft is spline connected (specification: 12×40×50). The center distance of the flange bolts is 220×150 mm. The weight of the pump body is approximately 180 kg, and its external dimensions (length × width × height) ≈650×400×420 mm.
3. Medium and Environmental requirements
– Medium requirements: L-HM 46/68 anti-wear hydraulic oil is suitable for normal temperature. L-HM 32 can be selected for low-temperature environment. The allowable medium viscosity is 25-400 mm²/s, with a moisture content of no more than 0.03% and an acid value of no more than 0.5 mgKOH/g. It is strictly prohibited to use media containing solid particles (particle size > 5 μm) or corrosive media.
– Cleanliness standard: The oil cleanliness must reach ISO 4406 15/12 grade. A 5 μm high-pressure fine filter must be placed in front of the oil suction port. The filter should be replaced immediately when the pressure difference of the filter is greater than 0.06 MPa.
– Environmental parameters: Operating environment temperature -25℃ to 90℃, relative humidity ≤95% (short-term condensation is allowed); With a protection grade of IP55, it is suitable for medium and large-sized construction machinery, dual-actuator industrial hydraulic stations, mining equipment and other heavy-duty scenarios.Ii. Working Principle
This pump is a swashplate axial double-circuit variable piston pump. Its core achieves high-pressure dual-circuit differentiated oil supply through the mechanism of “synchronous suction and discharge of dual cylinder bodies – linked adjustment of swashplate angles – independent oil supply of dual circuits”. The specific process is as follows:
1. Core process of oil suction and discharge
The drive shaft drives the double plunger cylinder block to rotate synchronously at high speed. The plungers inside the two cylinder blocks are respectively in close contact with the surface of the linkage swash plate under the force of the corresponding return disc spring and the hydraulic force. When the plunger rotates with the cylinder block to the side of the swash plate that is farther from the center, the plunger extends outward, increasing the volume of the plunger chamber in the cylinder block and creating a negative pressure. The hydraulic oil is then drawn into the two cylinder blocks respectively through the shared suction port and the dual filter screens. When the plunger rotates to the side of the swash plate closer to the center, the inclined surface of the swash plate compresses the plunger to retract inward, reducing the volume. The oil is then discharged from the dual oil outlets under high pressure, achieving independent and continuous oil supply in both channels.
2. Variables and Safety Protection
– Dual-channel variable regulation: By using dual-channel proportional electromagnets and load sensitive valves to jointly control the tilt Angle of the linked swash plate (adjustable from 0 to 18°), the plunger stroke of the two cylinder blocks can be synchronously or independently adjusted, achieving stepless distribution of dual-channel flow from 0 to 133.5L /min, with a response time of ≤0.3 seconds, and adapting to the different load requirements of dual actuators.
– Safety Assurance: Dual built-in high-pressure relief valves respectively control the pressure of the corresponding circuits. When the pressure exceeds 33 MPa, it will automatically unload. Constant power control limits the maximum flow rate based on the total load power to prevent the power source from overloading. The oil suction chamber oil replenishment valve prevents cavitation caused by excessive vacuum and protects the mating surfaces of the two cylinder blocks.

Iii. Product Features and Advantages
– Medium displacement high-pressure dual-circuit compatibility: With a rated pressure of 31.5MPa and a displacement of 89 mL/r, the dual-circuit independent fuel supply can be adapted to the dual-load actuator of 60-100-ton equipment (such as excavator bucket + rotary, hydraulic main cylinder + ejection cylinder), with a 70% increase in integration compared to two single pumps.
– Dual-loop precise coordinated control: Supports synchronous or differentiated regulation of dual-loop flow, with a flow distribution accuracy of ±2% and a pressure fluctuation of ≤1% under high-pressure conditions. It can achieve coordinated operation of dual actuators (such as the synchronous action of crane telescopic boom and luffing), increasing operation efficiency by 30%.
– Strong heavy-load impact resistance and reliability: The double cylinder block and plunger are precisely ground, with a fit clearance of ≤ 0.005mm and a volumetric efficiency of ≥94%. The core components are made of reinforced materials and undergo surface hardening treatment, capable of withstanding a short-term high-pressure impact of 35 MPa, with a rated working condition fault-free life of ≥ 15,000 hours.
– Compact integration, energy-saving and highly efficient: Sharing the drive shaft and oil suction port, it is 40% lighter and occupies 50% less space compared to the combination of two single pumps. Load sensitive control reduces the non-working loop flow to below 5 L/min and lowers the idle loss by 45%.
– High convenience of intelligent operation and maintenance: Supports dual control of PLC and hydraulic pilot, and can be connected to the intelligent monitoring system of the equipment to provide real-time feedback on dual-loop flow and pressure data. The external dual-channel pressure test port and oil level mirror do not require disassembly of the pump body for operation and maintenance, and the wear parts have strong universality.

Iv. Usage Functions and Purposes
1. Core usage functions
– High-pressure dual-loop fuel supply: It provides adjustable flow rates ranging from 0 to 133.5 L/min for medium and heavy-duty dual-actuator systems, meeting the all-condition requirements such as rapid operation of double-action (like the linkage of excavator bucket and boom) and high-pressure pressure holding (like the double-cylinder pressing of hydraulic presses).
– Dual-loop collaborative regulation: It can achieve synchronous increase or decrease of dual-loop flow, differentiated distribution, or independent operation of a single loop, and is compatible with multiple operation modes such as “simultaneous action”, “alternating action”, and “one main and one auxiliary” of dual actuators.
– Intelligent load adaptation: The dual-channel load sensitive system separately monitors the pressure of the corresponding actuator, automatically matches the flow output, avoids excessive flow overflow loss, and reduces system energy consumption.
2. Main application fields
In the field of medium and large-sized construction machinery: 60-100 ton crawler excavators (main hydraulic double circuit), 40-60 ton wheel loaders (lifting + bucket double circuit), 150-250 ton truck cranes (telescopic boom + luffing double circuit), suitable for heavy-duty fieldwork.
– Industrial equipment field: 1500-2500 ton hydraulic presses (with dual main cylinder drive circuits), medium-sized metallurgical rolling mills (with dual circuits for pressing and side bending), 1200-2000 ton heavy-duty injection molding machines (with dual circuits for mold closing and injection), suitable for high-pressure precision forming scenarios.
– Mining and special fields: Medium and large-scale mining crushing stations (dual breaker drive circuits), medium-sized tunnel boring machines (cutter head + propulsion dual circuits), 30-50 ton cranes for ports (hoisting + luffing dual circuits), suitable for continuous heavy-load working conditions.

V. Applicable Machines and Scenarios
1. Adapt to the core machine
Medium and large-sized construction machinery: 60-100 ton crawler excavators, 40-60 ton wheel loaders, 150-250 ton truck cranes, medium-sized hydraulic crushing stations.
– Industrial equipment: 1500-2500 ton hydraulic press, medium-sized metallurgical cold and hot rolling mill, 1200-2000 ton forging machine, 1200-2000 ton injection molding machine.
– Mining and special equipment: Medium and large-sized mining tunnel boring machines, medium-sized tunnel shield machines (main hydraulic systems), 30-50 ton gantry cranes for ports, large ship deck machinery.
2. Typical application scenarios
– Large excavator operation scenario: As the main pump of an 80-ton excavator, it has dual circuits for oil supply to the bucket and boom respectively. During excavation, the dual circuits output a total flow rate of 133.5 L/min, and when rotating, one circuit reduces to 40 L/min to adapt. Compared with the traditional dual single pump, it saves 35% energy and is suitable for mine stripping operations.
– Double-cylinder hydraulic press forming scenario: It is used for a 2000-ton double-cylinder hydraulic press. During rapid mold closing, the dual channels synchronously output a flow rate of 133.5L /min. When pressing forgings, the dual channels respectively reduce to 30L /min for pressure holding (pressure 31.5MPa), with a pressure holding accuracy of ± 0.3MPa. It is suitable for forging large components.
– Dual crushing hammer mining scenario: It is equipped with dual crushing hammer crushing stations for medium and large mines. The dual circuits supply oil to the two crushing hammers respectively. The single-circuit flow rate (40-80 L/min) is automatically adjusted according to the rock hardness. The efficiency of the dual hammer collaborative crushing is increased by 50%, making it suitable for continuous crushing operations of granite.

Six. Similar models
1. Alternative models of the same series
– H1P063RAA4C2NF6HG1H6L45L45ML24PNNNNNN: with small displacement double circuit model structure, the rated capacity of 63 mL/r, single peak flow of 94.5 L/min, pressure parameters are consistent, adapter 40 to 60 tons of equipment (e.g., 40 tons loaders), 25% lower cost than the original model.
– H1P112RAA4C2NF6HG1H6L45L45ML24PNNNNNN: The large-displacement dual-circuit model of the same series has a rated displacement of 112 mL/r, a maximum single-circuit flow rate of 168 L/min, and the same pressure parameters. It is suitable for equipment ranging from 100 to 120 tons (such as 100-ton excavators), but the cost is 30% higher than that of the original model.
2. Cross-series alternative models
– H1P089LAA4C2NF6HG1H6L45L45ML24PNNNNNN: left rotation to double circuit model, structure and parameter exactly, adapted the power source of the left-hand drive shaft, and the cost and the original model.
– H1P089RAA4C2NF6HG1H6L45L45ML24PNNNNNN – H: high temperature upgrade models, sealers and heat-resistant up to 160 ℃, adaptation of metallurgy, coking, such as high temperature operating mode, costs are 45% higher than the original model.
– H1P089RAA4C2NF6HG1H6L45L45ML24PNNNNNN – D: quantitative double circuit model, fixed displacement of 89 mL/r, pressure parameters are consistent, stable high-pressure two-circuit system adaptive traffic demand, costs 20% lower than the original model.

Vii. Precautions for Use
1. Medium management
For normal temperature conditions, L-HM 46/68 anti-wear hydraulic oil should be selected. For low-temperature environments, L-HM 32 anti-wear hydraulic oil should be chosen. It is strictly prohibited to mix oils of different grades or use deteriorated oils. Before the new pump is used for the first time, the pump body and the dual pipelines should be flushed with clean oil in a circulating manner for ≥30 minutes to ensure that the oil cleanliness meets ISO 4406 15/12 grade.
– Check the pressure difference of the dual-channel oil suction filter every week (replace the filter element immediately when the pressure difference is greater than 0.06 MPa), test the moisture content of the oil monthly (≤0.03%), and take samples to test the cleanliness of the oil every quarter. When emulsification, discoloration or presence of metal impurities in the oil is detected, immediately stop the machine, change the oil and disassemble and clean the double cylinder blocks.
2. Installation and commissioning
When installing, ensure that the coaxiality of the drive shaft and the motor shaft is ≤ 0.04mm (using an elastic coupling + positioning sleeve for positioning), and the flange connection bolts are evenly tightened with a torque of 800 N·m. The diameter of the oil suction pipeline should be no less than DN80, the length no more than 2.0m, and the number of elbows should not exceed 2 to avoid excessive oil suction resistance.
Before debugging, add hydraulic oil to the upper limit of the oil level gauge in the oil tank, and manually turn the wheel 3 to 5 times to confirm there is no jamming. Jog the motor to verify the rotation direction (right rotation), run it at low speed (1000 r/min) without load for 20 minutes, and then test the independent and synchronous regulation performance of the dual circuits respectively to ensure accurate flow distribution and stable pressure.
The oil suction port should be at least 600mm lower than the oil level in the oil tank, and high-pressure pressure gauges ranging from 0 to 40MPa should be installed at the dual oil outlet ports respectively. For outdoor installation, rain and dust covers are added, and the protection level is maintained at IP55. The remote control circuit is double-shielded to prevent electromagnetic interference.
3. Operation and Maintenance
During operation, real-time monitoring of the pump body temperature (normal ≤80℃, maximum ≤90℃), dual-loop outlet pressure and noise is carried out. If the temperature rises sharply by more than 15℃, the pressure fluctuates by more than 1.2MPa, or the noise abnormally increases (> 85dB), stop the machine immediately for inspection, with a focus on checking for oil contamination, wear of the double cylinder blocks, or jamming of the variable mechanism.
– Regular maintenance every 2000 hours: Clean the dual-way oil suction filter screen and the built-in relief valve, and check the fit clearance between the double plungers and the cylinder block (replace the matching parts when the clearance is greater than 0.01mm). Replace the high-pressure seals and hydraulic oil, and recalibrate the pressure of the double-way relief valve to 33 MPa.
– Strictly prohibit idling without oil (idling for more than 3 seconds will cause the plunger and cylinder block to sinter). It is strictly prohibited to operate at an excessive speed (> 2000 r/min) or under long-term overpressure (> 35 MPa). When implementing dual-loop regulation, avoid sudden changes in flow rate to prevent system impact from damaging pipelines and valves.
4. Storage protection
When stored for a long time, use special high-pressure plugs to block the oil suction port and the dual oil outlet ports. Inject special anti-rust oil into the pump body and apply high-temperature grease to the splines of the drive shaft. Store in a dry and well-ventilated warehouse with a temperature ranging from 0 to 45℃ and a humidity of no more than 60%. Avoid direct sunlight and heavy object compression. Manually turn the machine once a month to prevent component adhesion.
Before being put into use after being idle for more than 18 months, thoroughly clean the inner cavity and oil passage of the double cylinders and replace all high-pressure seals. After adding new oil, conduct a low-speed trial run for 2 hours to comprehensively test the dual-circuit regulation performance and pressure stability. After confirming there are no abnormalities, connect to the system.