MPT044 MPT046 MPV025 MPV035 MPV044 MPV046 Axial Piston Variable Displacement Pump MPV046CBAJSBBAAGBBDDABUYGANNN

I. Technical Parameters
Core performance parameters
– Pump type: Axial variable piston pump, swash plate heavy-duty structure, right-hand steering, suitable for high-pressure open/closed hydraulic circuits, supports stepless displacement adjustment, providing high-pressure oil supply for medium and small-sized heavy-duty single/double actuators.
– Displacement and pressure parameters: Rated displacement 46 mL/r (marked with model “046”); 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 69 L/min, and the variable range is continuously adjustable from 0 to 69 L/min. Volumetric efficiency ≥94%, total efficiency ≥86%; The rotational speed is within the range of 1000-1800 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 ≤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: Swash plate axial piston structure, integrating the piston cylinder body, variable swash plate, return plate and built-in high-pressure relief valve; It adopts a combined control of constant power, constant voltage and load sensitivity, and supports remote proportional adjustment of displacement. Flange installation, equipped with high-efficiency oil suction filter screen and pressure compensation valve.
– 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 oil suction port (S) is a DN65 flange, and the oil outlet port (P) is a DN50 flange. The drive shaft is spline connected (specification: 10×35×40). Install flange bolts with a center distance of 180×120 mm. The weight of the pump body is approximately 105 kg, and its external dimensions (length × width × height) ≈520×300×350 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 heavy-duty scenarios such as medium-sized construction machinery, industrial hydraulic stations, and 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 displacement – load sensitivity adaptation requirements”. The specific process is as follows:
1. Core process of oil suction and discharge
The drive shaft drives the cylinder block to rotate at high speed. Under the combined action of the spring force of the return disc and the hydraulic force, the plunger inside the cylinder block is always in close contact with the surface of the swash plate. 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. Hydraulic oil is then drawn into the chamber through the suction port and the filter screen. 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, 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 regulation: By combining a proportional electromagnet with a load-sensitive valve to control the variable mechanism, the tilt Angle of the swash plate (adjustable from 0 to 18°) is changed. An increase in the Angle leads to an increase in the plunger stroke and flow rate, while a decrease in the Angle results in a decrease in flow rate. The load sensitive system monitors the pressure demand of the actuator in real time, automatically matches the flow output, and achieves stepless adjustment from 0 to 69 L/min, with a response time of no more than 0.3 seconds.
– Safety Assurance: Equipped with a built-in high-pressure relief valve, it automatically unloads when the system pressure exceeds 33 MPa, and the overpressure oil flows back to the oil suction chamber. Constant power control automatically limits the maximum flow rate based on the power of the power source to avoid overload. The oil replenishment valve in the oil suction chamber prevents cavitation caused by excessive vacuum and protects the mating surface between the plunger and the cylinder block.

Iii. Product Features and Advantages
– High-pressure medium and small displacement compatibility: With a rated pressure of 31.5MPa and a displacement of 46 mL/r, the maximum flow rate is 69 L/min. It is precisely compatible with single/dual actuators of 30-60 ton class equipment, taking into account the flexibility of high-pressure power and flow regulation, and meeting the operational requirements of multiple working conditions.
– Load sensitive, energy-saving and highly efficient: Load sensitive control can dynamically output flow according to the demand of the actuator. The non-working flow can be reduced to below 5 L/min, and the idle consumption is reduced by 40%. The flow regulation accuracy is ±2%, the pressure fluctuation under high-pressure conditions is ≤1%, and it is suitable for multi-action coordinated operation.
– Strong heavy-load impact resistance and reliability: The plunger is precisely ground with the cylinder block, 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, featuring excellent resistance to impact loads. They can withstand a short-term high-pressure impact of 35 MPa and have a rated working condition fault-free life of ≥ 15,000 hours.
– Compact integration for easy installation: Integrates core components such as relief valves, load sensitive valves, and oil replenishment valves, eliminating the need for additional valve groups; Weighing only 105 kg, it is 30% lighter than the split system of the same displacement. The installation size is suitable for the limited space of medium-sized equipment and supports dual use of open and closed circuits.
– Convenient operation and maintenance with controllable costs: Supports dual control of PLC and hydraulic pilot, and can be connected to the intelligent monitoring system of the equipment. External oil level mirror and pressure test port, no need to disassemble the pump body for operation and maintenance. The wear parts are highly versatile, and the annual maintenance cost is 20% lower than that of similar products.

Iv. Usage Functions and Purposes
1. Core usage functions
High-pressure variable oil supply: It provides adjustable flow rates ranging from 0 to 69 L/min for medium, medium and heavy-duty systems, meeting the full working condition requirements from rapid action of the actuator (such as rapid mold closing of a hydraulic press), high-speed operation (such as rotation of an excavator) to high-pressure pressure holding (such as forging pressing).
– Load sensitivity adaptation: Real-time monitoring of system load pressure, automatic adjustment of output flow to prevent excessive flow overflow loss, and adaptation to multi-action alternating or coordinated operation scenarios (such as excavator digging + rotation linkage, loader lifting + bucket flipping).
– 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, enhancing system integration and reducing the number of pump body configurations.
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 machine tool hydraulic systems (feed + clamping circuit), 800-1200-ton heavy-duty injection molding machines (mold closing + injection circuit), suitable for precision operations in factories.
– 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 CNC lathe hydraulic system, 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
– Mining excavator operation scenario: As the main pump of a 50-ton excavator, it provides a high-pressure oil source of 31.5 MPa in the mine stripping operation. During excavation, it outputs a flow rate of 69 L/min to drive the bucket and boom linkage. Compared with traditional fixed displacement pumps, it saves 35% energy and is suitable for high-intensity continuous operations.
– Factory hydraulic press forming scenario: It is used for 1000-ton factory hydraulic presses. When closing the mold quickly, it outputs a flow rate of 69 L/min to improve efficiency. When pressing precision parts, it reduces to a small flow rate of 20 L/min for pressure holding (pressure 31.5MPa, pressure holding accuracy ± 0.3MPa), which is suitable for the precision forming requirements of components.
– Loader operation scenario: Equipped with a 30-ton wheel loader, it features a dual-loop oil distribution system for lifting and bucket. During lifting, it outputs a flow rate of 60 L/min to ensure efficiency. When the bucket is flipped, it automatically adjusts to 40 L/min to adapt. The shock-resistant structure is suitable for loading and unloading heavy materials.

Six. Similar models
1. Alternative models of the same series
– MPV032CBAJSBBAAGBBDDABUYGANNN: with smaller structure model, the rated capacity of 32 mL/r, 48 L/min, the maximum flow stress parameters are consistent, adapter light overload system (e.g., 20 tons loaders), 20% lower cost than the original model.
– MPV056CBAJSBBAAGBBDDABUYGANNN: in a range of displacement model, the rated capacity of 56 mL/r, maximum flow 84 L/min, the same pressure parameters, adaptation of large systems (e.g., 60 tons of excavator), cost is 25% higher than the original model.
2. Cross-series alternative models
– MPV046CLAJSBBAAGBBDDABUYGANNN: left rotation to the model, the structure and parameter exactly, the power source of the adapter left-hand drive shaft (e.g., part of imported diesel engine), the cost and the original model.
– MPV046CBAJSBBAAGBBDDABUYGANNN – 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.
– MPV046CBAJSBBAAGBBDDABUYGANNN – D: quantitative alternative models, 46 mL/r, fixed displacement pressure parameters are consistent, adapter traffic demand stable high pressure system (such as fixed location hydraulic press), 15% lower cost 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 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 DN65, 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.