90R 90L 055 075 100 180 90R250 Series 90R250PBINN80T3F1K00NNN321424 Axial Fixed Displacement Piston Pump

I. Technical Parameters
Core performance parameters
– Pump type: Radial variable piston pump, heavy-duty structure, right-rotating steering, suitable for high-pressure closed/open hydraulic circuits, supports stepless displacement adjustment, providing high-pressure and high-flow oil supply for single/multiple heavy-duty actuators.
– Displacement and pressure parameters: Rated displacement 250 mL/r (marked with model “250”); 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: Maximum flow at rated speed of 375 L/min, variable range 0-375 L/min continuously adjustable; Volumetric efficiency ≥94%, total efficiency ≥86%; The rotational speed is within the range of 1000-1500 r/min, and the flow regulation accuracy is ±2%.
– Operating characteristics: Continuous operating oil temperature ≤85℃, rated working condition inlet vacuum degree ≤ 0.02MPa; Noise value ≤83 dB (measured at 1 meter); The fault-free operating life is ≥ 18,000 hours (under rated conditions).
2. Structure and connection parameters
– Structural type: Radial plunger heavy-duty structure, integrating rotor, plunger, stator and constant power variable mechanism; The displacement is adjusted by an eccentric stator, and it is equipped with a built-in high-pressure relief valve and an oil replenishment valve. Flange installation, equipped with high-efficiency oil-absorbing filter screen and pressure compensation device.
– Core material: The plunger is made of stainless steel 17-4PH (quenched and tempered, hardness HRC40-44); The rotor is made of alloy cast iron QT600-3 (aged treatment, hardness HB280-320). The stator is made of bearing steel GCr15 (quenched treatment, hardness HRC62-66). The sealing part is a combination of high-pressure resistant polytetrafluoroethylene and fluororubber.
– Connection specifications: The oil suction port (S) is a DN80 flange, and the oil outlet port (P) is a DN65 flange. The drive shaft is spline connected (specification: 10×40×45). The installation flange dimensions comply with the ISO heavy-duty standard, and the center distance of the bolts is 220×160 mm. The weight of the pump body is approximately 180 kg, and its external dimensions (length × width × height) ≈650×380×420 mm.
3. Medium and Environmental requirements
– Medium requirements: Compatible with L-HM 68 anti-wear hydraulic oil (L-HM 46 can be selected in low-temperature environments), allowable medium viscosity 25-400 mm²/s, moisture content ≤0.03%, acid value ≤ 0.5mgKOH /g, strictly prohibit the use of 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 heavy-load and harsh working conditions such as large-scale construction machinery, mining equipment, and heavy industrial hydraulic stations.Ii. Working Principle
This pump is a radial variable piston pump. Its core achieves high-pressure and high-flow oil supply through the mechanism of “radial reciprocating volume change of the piston – stator eccentricity adjustment of the displacement”. The specific process is as follows:
1. Core process of oil suction and discharge
The drive shaft drives the rotor to rotate at high speed. Under the action of centrifugal force, the plunger on the rotor closely adheres to the inner surface of the stator. When the plunger rotates with the rotor to the side with the maximum eccentricity of the stator, it extends outward, increasing the volume of the plunger cavity and creating a negative pressure. The hydraulic oil is then sucked into the cavity through the oil suction port and the filter screen. When the plunger rotates to the side with the minimum eccentricity of the stator, the inner surface of the stator squeezes the plunger to retract inward, causing a sharp reduction in volume. The oil is then discharged from the oil outlet under high pressure, completing the oil suction and discharge cycle.
2. Variables and Safety Protection
– Stepless variable regulation: The stator eccentricity is changed through the hydraulic control variable mechanism (the eccentricity is adjustable from 0 to 15 mm). When the eccentricity increases, the plunger stroke increases, and the flow rate increases accordingly. A reduction in eccentricity leads to a decrease in flow rate, enabling stepless regulation from 0 to 375 L/min and meeting the dynamic flow requirements of the load.
– Safety Assurance: Built-in high-pressure relief valve automatically unloads when the system pressure exceeds 33 MPa. Constant power control can automatically adjust the flow rate according to the load power to avoid overload of the power source. The oil suction chamber oil replenishment valve is combined with the check valve to prevent cavitation caused by excessive vacuum and extend the service life of the pump body.

Iii. Product Features and Advantages
– Strong adaptability to high pressure and heavy load: Rated pressure of 31.5MPa +0- 375L /min with stepless variable flow, it can precisely match different working conditions of heavy-load systems (such as large flow for excavator excavation and constant pressure oil supply for lifting), saving more than 35% energy compared to fixed displacement pumps, and is suitable for equipment of 200 tons and above.
– High-flow stable output: Maximum flow rate of 375 L/min, supports single-pump drive and parallel convergence of multiple actuators, no need for multiple pumps to be stacked, simplifying the system structure; The flow regulation accuracy is ±2%, and the pressure fluctuation under high-pressure conditions is ≤1%, making it suitable for multi-action coordination scenarios of large-scale equipment.
– Wear-resistant, impact-resistant and long service life: The plunger and stator are precisely ground, with a fit clearance of ≤ 0.005mm and a volumetric efficiency of ≥94%. The core components are reinforced with material design, which has a better shock load resistance than ordinary plunger pumps, and the rated working condition fault-free life is ≥ 18,000 hours.
– Wide operating condition adaptability: It operates within a wide temperature range of -25℃ to 90℃, with an IP55 protection rating, making it suitable for harsh environments such as dust, humidity, and vibration. It supports dual use of open and closed circuits and can be adapted to high-voltage systems in different industries such as construction machinery, mining, and metallurgy.
– Intelligent control is convenient: It integrates three control methods: constant pressure, constant power, and remote proportional control. It supports PLC or hydraulic pilot control, with a variable response time of ≤0.3 seconds, making it suitable for automated heavy-duty production lines or intelligent construction machinery.

Iv. Usage Functions and Purposes
1. Core usage functions
– High-pressure and high-flow oil supply: It provides adjustable flow rates ranging from 0 to 375 L/min for heavy-duty hydraulic systems, meeting the full-condition requirements of actuators from rapid action to high-pressure pressure holding (such as rapid mold closing of hydraulic presses and low-flow pressure holding for pressing).
– Multi-mode precise control: Constant pressure control ensures system pressure stability (such as hydraulic press pressure holding), constant power control prevents power source overload, and remote proportional control enables automatic flow regulation, making it compatible with intelligent hydraulic systems.
– Single-pump multi-loop drive: As the power core of the high-pressure system, it distributes oil through multi-way valves to drive multiple heavy-duty actuators to act in coordination (such as the multi-action linkage of the excavator bucket, boom, and rotation), enhancing the system integration.
2. Main application fields
In the field of large-scale construction machinery: 100-200 ton crawler excavators (main hydraulic circuit), 50-80 ton wheel loaders (lifting + bucket flipping circuit), 200-500 ton truck cranes (telescopic boom + luffing circuit), suitable for heavy-load fieldwork.
In the field of heavy industrial equipment: 2000-5000 ton hydraulic presses (main cylinder drive circuits), large-scale metallurgical rolling mills (pressing + cowinder circuits), heavy forging equipment (forging + clamp drive circuits), suitable for high-pressure precision forming scenarios.
– Mining and special fields: Large-scale mining crushing stations (high-pressure crushing circuits), tunnel boring machines (cutter head drive + propulsion circuits), heavy-duty gantry cranes in ports (hoisting + luffing circuits), large ship hydraulic systems, suitable for continuous heavy-load harsh environments.

V. Applicable Machines and Scenarios
1. Adapt to the core machine
– Large-scale construction machinery: 100-200 ton crawler excavators, 50-80 ton wheel loaders, 200-500 ton truck cranes, large-scale hydraulic crushing stations.
– Heavy industrial equipment: 2000-5000 ton hydraulic presses, large metallurgical cold and hot rolling mills, forging machines over 2000 tons, large injection molding machines (over 2000 tons).
– Mining and special equipment: Large-scale mining tunnel boring machines, tunnel shield machines (main hydraulic systems), port container gantry cranes (over 40 tons), large ship deck machinery.
2. Typical application scenarios
– Main circuit scenario of excavator: As the main pump of a 120-ton excavator, it provides a high-pressure oil source of 31.5MPa. During excavation, it outputs a large flow rate of 375 L/min for driving, and automatically drops to 180 L/min when rotating, saving 40% of energy and being suitable for deep mining in mines.
– Hydraulic press scenario: It is used in a 3000-ton hydraulic press. During rapid mold closing, it outputs a large flow rate of 375 L/min. During pressing, it automatically reduces to a small flow rate of 50 L/min for pressure holding (31.5MPa pressure), with a pressure holding accuracy of ± 0.3MPa. It is suitable for the forming of heavy forgings.
– Mining crushing scenario: It is equipped with a large-scale mining crushing station, providing 31.5MPa high-pressure oil for the double crushing hammers. The flow rate (150-300 L/min) is automatically adjusted according to the hardness of the rock to ensure the efficiency of the double hammer’s coordinated crushing and is suitable for continuous high-intensity crushing operations.

Six. Similar models
1. Alternative models of the same series
– 90 r200pbinn80t3f1k00nnn321424: with the structure of the displacement model, the rated capacity of 200 mL/r, maximum flow 300 L/min, pressure parameters are consistent, adapter medium overloaded system (e.g., 50 tons loaders), 30% lower cost than the original model.
– 90 r315pbinn80t3f1k00nnn321424: with a series of large displacement model, the rated capacity of 315 mL/r, 472.5 L/min, maximum flow rate pressure parameters, the same adapter oversize overloaded system (such as 5000 tons press), cost is 45% higher than the original model.
2. Cross-series alternative models
– 90 r250lbinn80t3f1k00nnn321424: left rotation to the model, the structure and parameters are consistent, adapted the drive shaft of sinistral overloaded power source (e.g., import large diesel engine), cost consistent with the original model.
High temperature – 90 r250pbinn80t3f1k00nnn321424 – H: upgrade model, seals and heat-resistant up to 160 ℃, adapter, metallurgy, coking, high temperature working conditions, such costs are 55% higher than the original model.
– 90 r250pbinn80t3f1k00nnn321424 – D: quantitative alternative models, fixed displacement of 250 mL/r, pressure parameters are consistent, stable overloaded system adaptive traffic demand, costs 20% lower than the original model.

Vii. Precautions for Use
1. Medium management
– L-HM 46/68 anti-wear hydraulic oil must be selected. It is strictly prohibited to mix different grades of oil. Before the new pump is used for the first time, the pump body and pipelines should be flushed with clean oil in a circulating manner for ≥30 minutes to ensure that the cleanliness meets ISO 4406 15/12 grade.
– Check the pressure difference of the oil suction filter weekly (replace it immediately if it exceeds 0.06 MPa), test the moisture content of the oil monthly (≤0.03%), and take samples for cleanliness testing every quarter. When emulsification, discoloration or metal impurities are found in the oil, stop the machine immediately, change the oil and disassemble and clean it.
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), and the flange 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 2.5m, and the number of elbows should not exceed 2 to avoid excessive oil suction resistance.
When debugging, first add oil to the upper limit of the oil level gauge, and manually turn the wheel 3 to 5 times to confirm there is no jamming. Jog the motor to verify the correct rotation direction. After running at a low speed (1000 r/min) for 20 minutes, test the variable adjustment performance (no lag and stable pressure when adjusting from 0 to the maximum flow rate).
The oil suction port is more than 800mm lower than the oil level in the oil tank, and a high-pressure pressure gauge (with a range of 0-40MPa) is installed at the oil outlet. For outdoor installation, a rain and dust cover must be added to ensure a protection level of IP55. The remote control circuit needs to be shielded to avoid electromagnetic interference.
3. Operation and Maintenance
During operation, real-time monitoring of the pump body temperature (normal ≤80℃, maximum ≤90℃), outlet pressure and noise is carried out. When a sudden temperature rise of more than 15℃, a pressure fluctuation of more than 1.2MPa, or abnormal variable adjustment is detected, immediately stop the machine to check for wear of the plunger or jamming of the variable mechanism.
– Regular maintenance every 2,500 hours: Clean the oil suction filter screen and relief valve, and check the fit clearance between the plunger and stator (replace if > 0.012mm). Replace the high-pressure seals and hydraulic oil, and calibrate the variable control parameters and relief valve pressure (ensuring 33 MPa).
– Do not run without oil (more than 3 seconds will cause the plunger and stator to sinter); It is strictly prohibited to operate at an excessive speed (> 2000 r/min) or under long-term overpressure (> 35 MPa). When adjusting variables, avoid sudden changes in flow rate to prevent system shock from damaging the pipelines.
4. Storage protection
When stored for a long time, seal the oil suction port with a high-pressure plug, 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 (0-45℃, humidity ≤60%). Manually turn the machine once a month to prevent components from sticking together.
Before the pump is put into use after being idle for more than 18 months, thoroughly clean the inner cavity of the pump and replace the high-pressure sealing parts. After adding new oil, conduct a low-speed trial run for 2 hours to test the variable performance and pressure stability. Once no abnormalities are found, connect it to the system.