A17F A17FO A17FO023 A17FO032 A17FO045 A17FO063 A17FO080 A17FO107 High Pressure Hydraulic Piston Pump A17F0032/10MLWK0E81-0

I. Technical Parameters
Core performance parameters
– Pump type: Axial variable piston pump, swash plate compact structure, right-hand steering, suitable for high-pressure open/closed hydraulic circuits, supports stepless displacement adjustment, providing high-pressure and medium and small flow oil supply for medium and small-sized heavy-duty single/double actuators.
– Displacement and pressure parameters: Rated displacement 32 mL/r (marked with model “0032”); 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 is 48 L/min, and the variable range is continuously adjustable from 0 to 48 L/min. 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 ≤78 dB (measured at 1 meter); The fault-free operating life is ≥ 15,000 hours (under rated conditions).
2. Structure and connection parameters
– Structural type: Swash plate axial piston structure, integrating the piston cylinder body, variable swash plate, return plate and built-in high-pressure relief valve; It adopts constant power + constant voltage compound control and supports remote proportional adjustment of displacement. 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 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 polytetrafluoroethylene and fluororubber.
– Connection specifications: The oil suction port (S) is a DN50 flange, and the oil outlet port (P) is a DN40 flange. The drive shaft is spline connected (specification 8×28×32). Install flange bolts with a center distance of 160×100 mm. The weight of the pump body is approximately 75 kg, and its external dimensions (length × width × height) ≈460×260×300 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-duty working conditions such as medium-sized construction machinery, industrial hydraulic stations, and small and medium-sized mining equipment.Ii. Working Principle
This pump is a swashplate type axial variable piston pump. Its core achieves high-pressure oil supply through the mechanism of “axial reciprocating volume change of the piston – swashplate Angle adjustment of the displacement”. The specific process is as follows:
1. Core process of oil suction and discharge
The drive shaft rotates the cylinder block at high speed, and the plunger inside the cylinder block is always in close contact with the surface of the swash plate under the action of the spring force of the return disc. When the plunger rotates with the cylinder block to the lower end of the swash plate (the side farther from the center), the plunger extends outward, increasing the volume of the plunger chamber in the cylinder block and creating a negative pressure. Hydraulic oil is then drawn into the chamber through the suction port and the filter screen. When the plunger rotates to the upper end of the swash plate (the side closer to the center), the inclined surface of the swash plate compresses 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 continuous oil suction and discharge cycle.
2. Variables and Safety Protection
– Stepless variable adjustment: The variable mechanism is controlled by a proportional electromagnet to change the tilt Angle of the swash plate (adjustable from 0 to 18°). When the Angle increases, the plunger stroke increases, and the flow rate increases accordingly. When the Angle is reduced, the flow rate decreases, achieving stepless adjustment from 0 to 48 L/min to meet the dynamic flow requirements of the load.
– Safety Assurance: Equipped with a built-in high-pressure relief valve, it automatically unloads when the system pressure exceeds 33 MPa, allowing the overpressurized oil to flow back to the oil suction chamber. Constant power control can automatically match the flow rate according to the load power, avoiding overload of the power source. The oil replenishment valve in the oil suction chamber prevents cavitation caused by excessive vacuum and extends the service life of key components of the pump body.

Iii. Product Features and Advantages
– Precise matching of high pressure and medium and small displacement: With a rated pressure of 31.5MPa and a medium and small displacement of 32 mL/r, the maximum flow rate is 48 L/min, precisely matching the single/dual actuator requirements of 30-60-ton equipment (such as medium-sized excavator excavation and hydraulic press pressing), it saves more than 30% energy compared with large-displacement pumps of the same pressure.
– High and stable regulation accuracy: The flow regulation accuracy is ±2%, and the pressure fluctuation under high-pressure conditions is ≤1%. It supports single-pump drive and dual-actuator joint oil supply, eliminating the need for multiple pumps to be stacked and simplifying the system pipeline design. The variable response time is ≤0.3 seconds, suitable for dynamic load scenarios.
– Compact, lightweight and easy to integrate: It adopts a compact swash plate structure, weighing only 75 kg, which is 40% lighter than a large-displacement pump of the same pressure. The installation size is suitable for the limited space of medium-sized equipment, supports dual use of open and closed circuits, and has strong adaptability to multiple industries.
– Wear-resistant, impact-resistant and long service life: The plunger and cylinder block are precisely ground, with a fit clearance of ≤ 0.005mm and a volumetric efficiency of ≥94%. The core components are made of reinforced materials, featuring excellent resistance to impact loads and a rated working condition fault-free life of ≥ 15,000 hours.
– Intelligent control and easy operation: It integrates three control methods: constant pressure, constant power, and remote proportional control. It supports PLC or hydraulic pilot control and can be connected to the intelligent control system of the equipment, reducing the intensity of manual operation. It is equipped with core protection functions and has a low threshold for operation and maintenance.

Iv. Usage Functions and Purposes
1. Core usage functions
High-pressure variable oil supply: It provides adjustable flow rates ranging from 0 to 48 L/min for medium, medium and heavy-duty systems, meeting the full-condition flow requirements of actuators from rapid actions (such as quick mold closing in hydraulic presses) to high-pressure pressure holding (such as forging pressing).
– Multi-mode precise pressure control: Constant pressure control ensures stable system pressure (pressure holding accuracy ± 0.3MPa), constant power control prevents power source overload, and remote proportional control realizes automatic flow regulation, making it suitable for intelligent production or operation scenarios.
– Single-pump multi-loop drive: As the core power of the system, it distributes oil through multi-way valves to drive two heavy-duty actuators to act in coordination (such as the linkage of excavator bucket and boom, or the lifting of loader and bucket flipping), enhancing the system integration.
2. Main application fields
In the field of medium-sized construction machinery: 30-60 ton crawler excavators (main hydraulic circuit), 20-40 ton wheel loaders (lifting + bucket circuit), 80-150 ton truck cranes (telescopic boom + luffing circuit), suitable for heavy-load fieldwork.
– Industrial equipment field: 800-1500-ton hydraulic presses (main cylinder drive circuit), medium-sized metallurgical rolling mills (downward circuit), 800-1200-ton heavy-duty injection molding machines (mold closing + injection circuit), suitable for high-pressure precision forming scenarios.
– Mining and special fields: Small and medium-sized mining crushing stations (hammer drive circuits), small tunnel boring machines (cutter head drive circuits), 10-30 ton cranes for ports (lifting + luffing circuits), suitable for continuous heavy-load working conditions.

V. Applicable Machines and Scenarios
1. Adapt to the core machine
Medium-sized construction machinery: 30-60 ton crawler excavators, 20-40 ton wheel loaders, 80-150 ton truck cranes, medium-sized hydraulic crushing stations.
– Industrial equipment: 800-1500 ton hydraulic press, medium-sized metallurgical cold and hot rolling mill, 800-1200 ton forging machine, 800-1200 ton injection molding machine.
– Mining and special equipment: Small and medium-sized mining tunnel boring machines, small tunnel shield machines (main hydraulic systems), 10-30 ton gantry cranes for ports, medium-sized ship deck machinery.
2. Typical application scenarios
– Medium-sized excavator operation scenario: As the main pump of a 50-ton excavator, it provides a high-pressure oil source of 31.5MPa. During excavation operations, it outputs a large flow rate of 48 L/min to drive the bucket. When rotating, it automatically drops to 24 L/min to adapt. Compared with traditional fixed displacement pumps, it saves 35% energy and is suitable for mine stripping operations.
– Hydraulic press forming scenario: It is used in 1000-ton hydraulic presses. When closing the mold quickly, it outputs a flow rate of 48 L/min to improve efficiency. When pressing forgings, it automatically reduces to a small flow rate of 15 L/min for pressure holding (pressure 31.5MPa), with a pressure holding accuracy of ± 0.3MPa. It is suitable for forging of automotive parts.
– Mining crushing scenario: It is equipped with small and medium-sized mining crushing stations, providing 31.5MPa high-pressure oil for each crushing hammer. The flow rate is automatically adjusted according to the hardness of the rock (20-40L /min), ensuring crushing efficiency while avoiding equipment overload. It is suitable for continuous limestone crushing operations.

Six. Similar models
1. Alternative models of the same series
-A17F0025/10MLWK0E81-0: A small-displacement model of the same structure, with a rated displacement of 25 mL/r and a maximum flow rate of 37.5 L/min. The pressure parameters are consistent, suitable for light and heavy load systems (such as 20-ton loaders), and the cost is 20% lower than that of the original model.
-A17F0040/10MLWK0E81-0: A mid-displacement model in the same series, with a rated displacement of 40 mL/r and a maximum flow rate of 60 L/min. The pressure parameters are the same. It is suitable for medium and large-sized systems (such as 60-ton excavators), but the cost is 25% higher than that of the original model.
2. Cross-series alternative models
-A17F0032/10MLWK0E81-0-L: Left-rotating model, with exactly the same structure and parameters. It is compatible with the power source for left-rotating drive shafts (such as some imported diesel engines), and the cost is the same as the original model.
-A17F0032/10MLWK0E81-0-H: High-temperature upgraded model, with the temperature resistance of the sealing parts increased to 160℃, suitable for high-temperature operation conditions in metallurgy, coking and other industries. The cost is 45% higher than that of the original model.
-A17F0032/10MLWK0E81-0-D: A quantitative version alternative model, with a fixed displacement of 32 mL/r, consistent pressure parameters, suitable for high-pressure systems with stable flow requirements (such as fixed-station hydraulic presses), and a cost 15% 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 oils of different grades or use deteriorated oils. 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 ≥20 minutes to ensure that the oil cleanliness meets ISO 4406 15/12 grade.
– Check the pressure difference of the oil suction filter weekly (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 quarterly. When emulsification, discoloration or presence of metal impurities in the oil is detected, immediately stop the machine to change the oil and disassemble and clean the pump body.
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 500 N·m. The diameter of the oil suction pipeline should be no less than DN50, the length no more than 2.0m, and the number of pipeline 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 15 minutes, and then test the variable adjustment performance (no lag and stable pressure when adjusting from 0 to the maximum flow rate).
The oil suction port should be at least 500mm lower than the oil level in the oil tank, and a 0-40MPa high-pressure pressure gauge must be installed at the oil outlet. When installed outdoors, a rain and dust cover should be added to ensure that the protection level remains at 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 operating temperature ≤80℃, maximum not exceeding 90℃), outlet pressure and operating 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, stop the machine immediately for inspection, with a focus on checking the contamination of the oil or the wear of the plunger and swash plate.
Regular maintenance should be carried out every 2000 hours: clean the oil suction filter screen and the built-in relief valve, and check the fit clearance between the plunger 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 relief valve pressure to 33 MPa.
– It is strictly prohibited to run the engine without oil (idling for more than 3 seconds may cause sintering damage to the plunger and cylinder block). It is strictly prohibited to operate at an excessive speed (> 2000 r/min) or under long-term overpressure (> 35 MPa). When adjusting the variable, avoid sudden changes in flow rate to prevent system shock from damaging the pipelines and valves.
4. Storage protection
When stored for a long time, the oil suction port and the oil outlet should be blocked with special high-pressure plugs. Special anti-rust oil should be injected into the pump body, and high-temperature grease should be applied to the splined parts of the drive shaft. Store in a dry and well-ventilated warehouse (ambient temperature 0-45℃, relative humidity ≤60%), avoid direct sunlight and heavy object compression. Manually turn the machine once a month to prevent component adhesion.
Before the pump is put into use after being idle for more than 18 months, the inner cavity and oil passage of the pump body must be thoroughly cleaned, and all high-pressure seals must be replaced. After adding new hydraulic oil, conduct a low-speed trial run for 2 hours to comprehensively test the variable performance and pressure stability. Only after confirming there are no abnormalities can it be connected to the system for use.