Hydraulic Piston Motor MR700F-N1C1N1C1N Five Star Motor MR700F MRE800F MR600F MRE500E MR450E MR3600L MR4100L MR4500L MRE5400L

I. Core Technical Parameters
Basic specifications
Type: External five-star radial piston hydraulic motor, MR700F series, N1C1N1C1N is the special function code
Nominal displacement: approximately 700cc/rev (700 milliliters of hydraulic oil output per revolution), theoretical flow rate at 1500r/min is approximately 1050L/min
Rated working pressure: 28MPa (280bar), short-term peak pressure up to 35MPa (350bar), suitable for high-pressure working conditions
Rated speed: 350-750r/min, minimum stable speed ≥10r/min, it belongs to low-speed high-torque type motor
Output torque: approximately 12,550N · m (at 28MPa pressure), maximum peak torque: approximately 15,000N · m (short term)
Output power: approximately 90kW (under rated conditions), maximum up to 120kW (for short periods)
Rotation direction: Standard clockwise (viewed from the shaft end), reversible rotation can be achieved through a reversing valve
Weight: Approximately 185kg (excluding accessories), compact structure, high power density
Working parameters
Volumetric efficiency: ≥92% (under rated conditions), with low energy conversion loss
Overall efficiency: ≥85%, with highly efficient comprehensive performance
Applicable medium: Anti-wear hydraulic oil (viscosity index ≥90), L-HM46 or L-HV46 hydraulic oil is recommended
Medium viscosity: 10-300mm²/s, optimal working viscosity: 20-60mm²/s
Medium temperature: -20℃ to +85℃, recommended working temperature: 30-55℃
Oil cleanliness: ISO 4406 18/15 grade. A 10μm precision filter must be installed to protect the precision componentsIi. Working Principle
The core working mechanism of five-star motor
Structural features
It adopts an outer five-star radial plunger structure, with the five plungers evenly distributed in a star shape. (The origin of the name “five-star”)
It is mainly composed of the housing, eccentric shaft (crankshaft), five-star wheel, plunger, pressure ring, distribution shaft and bearing
The plunger is installed in the radial hole of the housing and can slide freely along the radial direction
The five-star wheel is fitted on the CAM of the eccentric shaft, and a pressure ring is embedded in each of its five planes
The distribution shaft is fixed and connected to the inlet and return oil ports, responsible for distributing high-pressure oil and low-pressure oil
Principle of torque generation
High-pressure oil enters the distribution shaft from the oil inlet and then enters the oil chamber at the bottom of the plunger through the distribution window
The oil pressure drives the plunger to move outward, and the pressure ring at the head of the plunger closely adheres to the surface of the five-star wheel
Due to the eccentric shaft design, the extension length of the plunger at different positions varies, resulting in differences in the force-bearing area
When the plunger extends the longest, the force-bearing area is the largest, and the torque generated is also the greatest
The five-star wheel rotates around the center of the eccentric shaft under the thrust of the plunger, thereby driving the output shaft to rotate
When the plunger turns to the low-pressure area, it retracts under the action of the spring force and the return oil pressure, completing one working cycle
The five plungers work in rotation to output continuous and stable torque, with the torque fluctuation controlled within ±3%
Oil flow direction
High-pressure oil → Oil inlet → high-pressure window of the distribution shaft → Oil chamber at the bottom of the plunger → Push the plunger outward
The plunger moves → drives the five-star wheel to rotate → the output shaft acquires torque
Plunger return → Oil → low-pressure window of the distribution shaft → oil outlet → return to the oil tank
The distribution shaft rotates synchronously with the output shaft to ensure that each plunger is connected to the high and low pressure oil in the correct position

Iii. Product Features and Advantages
1. Outstanding low-speed high-torque performance
Ultra-high starting torque: The starting torque efficiency is ≥92%, allowing direct starting under load without the need for no-load acceleration
Low-speed stability: It can operate smoothly without crawling at an ultra-low speed of 10r/min, making it suitable for precise control
High torque output: The output torque of the same volume is 5 to 8 times that of a gear motor, making it suitable for heavy-duty applications
Small torque ripple: The uniform distribution of five plungers and the eccentric shaft design keep the torque fluctuation within ±3%, ensuring smooth operation
2. Structural and reliability advantages
Force balance: The five-star wheel and plunger design cancel each other out the radial forces, reducing the bearing load and extending the service life
Impact resistance: It can withstand an instantaneous impact of 200% of the rated pressure and adapt to harsh working conditions
Reliable sealing: It adopts fluororubber sealing, which is heat-resistant, oil-resistant, has low leakage and a long service life
Strong durability: The key friction pairs are made of special wear-resistant materials, with an average mean time between failures of over 8,000 hours
Wide application: It can operate within a temperature range of -20 ℃ to +85℃ and adapt to various environmental conditions
3. System adaptability and control characteristics
Bidirectional rotation: Easily achieve forward and reverse rotation through a directional control valve, simplifying the design of the hydraulic system
Good self-priming ability: No additional auxiliary pump is required, and the suction lift can reach 4 meters (depending on the viscosity of the medium)
Modular design: Functional components such as brakes and buffer valves can be selected as needed to enhance system integration
Multiple installation methods: We offer various flange and shaft extension forms to meet the interface requirements of different equipment
4. Maintenance and Economy
Easy maintenance: The structure is relatively simple, and the main components can be replaced separately, reducing the maintenance time by 50%
Long service life: Special materials and heat treatment processes ensure that the key friction pairs have a service life of over 10,000 hours
Energy consumption optimization: Maintain high efficiency under light load conditions and reduce system operating costs

Iv. Usage Functions and Purposes
Core functions
Convert the pressure energy of the hydraulic system into mechanical energy to provide rotational power
Precisely control the output torque and rotational speed to meet the requirements of different working conditions
In coordination with the hydraulic control system, it realizes the automated production process
Main application fields
Injection molding machinery
The screw drive of the injection molding machine (such as the special motor for injection molding machines of Hsin Hsing) provides stable torque for plastic melting and injection
The mold closing device drive ensures a tight mold closure and prevents flash on plastic products
Maintain a stable pressure during the pressure-holding stage to enhance product quality and dimensional accuracy
Winch and lifting equipment
The hoisting systems of cranes, tower cranes and port machinery provide high-torque lifting force
The ship’s anchor winch and winch drive ensure the safe and reliable retraction and extension of the anchor chain under wind and wave conditions
The construction hoist drive ensures the safety of vertical transportation of personnel and materials
Construction machinery
The rotary platform drive of excavators and loaders enables smooth and precise 360° rotation
The drive systems of road rollers and pavers provide stable traction and precise speed control
The power head of the trenchless drilling rig provides high torque for pipeline laying
Mining machinery
The mine hoist drive is responsible for the vertical transportation of personnel and ores
The drive of scraper conveyors and belt conveyors provides stable power in harsh environments
Crusher and ball mill drive, providing continuous high torque for ore crushing and grinding
Ship and Ocean Engineering
The steering gear system drive ensures precise control of the ship’s navigation direction
The drive of the Marine platform lifting system enables the safe positioning of the platform at different water levels
Deck machinery such as cranes and winch drives are suitable for damp and salt spray environments

V. Applicable Machines and Scenarios
1. Typical applicable machines
Injection molding machine
It is particularly suitable for large injection molding machines with a clamping force of 1,000 to 3,000 tons, such as the MA series and MK series of a certain brand
As a screw drive motor, it provides a stable torque (approximately 12,550N · m) in the sol stage to ensure uniform melting of the plastic
Maintain a stable pressure during the pressure-holding stage to prevent shrinkage and deformation of plastic products and increase the yield of qualified products
Port crane
It is applicable to the main hoisting mechanism of tyre cranes and portal cranes
It provides stable power under frequent start-stop and heavy load conditions to ensure the safe loading and unloading of goods
In combination with the variable frequency hydraulic system, precise position control can be achieved, with a positioning accuracy of ±5mm
Maintain reliable operation in the high-temperature and high-humidity port environment and reduce maintenance frequency
Ship anchor engine
Mooring systems applicable to vessels of 5,000 to 30,000 tons
Provide sufficient torque to retract and extend the anchor chain in stormy weather to ensure the safe anchoring of the vessel
It has excellent low-speed stability and can precisely control the lowering speed of the anchor chain to avoid impact loads
2. Characteristics of applicable scenarios
Low-speed and heavy-load working conditions that require large torque output, such as injection molding machine screws, winches, anchor machines, etc
Precision control equipment that requires smooth operation and low noise, such as precision injection molding machines and precision processing machinery
It can adapt to high-temperature, humid, dusty and salt spray environments in harsh working conditions such as mining, metallurgy and shipping
The working device of construction machinery that requires frequent start-stop and reversing responds quickly and has little impact
In medium and high-pressure application scenarios where the hydraulic system pressure is stable at 20-30 mpa, its high-pressure performance advantages are fully exerted

Six. Similar models
1. Different specifications and models of the same series
MR300F: With a displacement of approximately 300cc/rev and a lighter weight (about 100kg), it is suitable for medium and small-sized equipment and systems with lower flow requirements
MR1100F: Displacement is approximately 1100cc/rev, with a greater output torque (about 19,000N · m), making it suitable for large-scale construction machinery and Marine equipment
MR700F-N1N1N1N1N: It is basically the same as MR700F-N1C1N1C1N, but adopts different sealing and bearing configurations, and is suitable for general industrial applications
2. Different series models of the same type
Compared with the MR700F series, the MR700D adopts a different current distribution method and has a higher rotational speed characteristic, making it suitable for application scenarios that require higher rotational speeds
MRC700: Similar to the MR700F series, but specifically designed for injection molding machines, it features a special shaft seal and cooling system, making it suitable for the high-temperature working environment of injection molding machines
YLM series: Domestic five-star foreign motor, similar in performance to MR700F, more economical in price, suitable for domestic market maintenance and matching
3. Domestic alternative products
HNM11 series: Domestic five-star foreign motor, displacement 707-1301 mL /r, rated torque 2612-3265N · m, can replace MR700F series under certain conditions
JMDG11 series: Domestic radial piston motor, with parameters close to MR700F, and a significant price advantage, suitable for application scenarios with limited budgets

Vii. Precautions for Use
1. Installation points
Direction confirmation
It must be installed in the specified direction (standard clockwise). The oil inlet and return ports must not be connected in reverse; otherwise, the internal seal and distribution mechanism will be damaged
The oil inlet is connected to the system pressure oil, the oil outlet is connected to the oil tank, and the oil drain is separately led back to the oil tank and not connected to the back pressure
Fixation and connection
The installation plane must be flat (flatness < 0.1mm), and the fixing bolts should be evenly tightened to prevent the shell from deforming and affecting the movement of the plunger
The output shaft and the load must be connected by an elastic coupling. Rigid connection is strictly prohibited
Coaxiality error is less than 0.05mm, angular deviation is less than 0.5°, reducing vibration and bearing load
The installation bracket must have sufficient rigidity to prevent vibration and displacement during operation
Pipeline configuration
The diameter of the oil inlet pipe should be no less than 65mm and the length less than 2m to reduce oil suction resistance and prevent cavitation
The diameter of the oil outlet pipe should be ≥50mm to ensure smooth oil return and a back pressure of less than 0.5MPa
The oil drain pipe must be led back to the oil tank separately and not connected to back pressure to ensure the smooth discharge of the leaked oil inside
All pipelines must be firmly fixed to prevent vibration and wear
2. Startup and Operation management
Startup program
Check the oil level in the fuel tank (≥ 300mm above the suction port) and the oil temperature (≥-10℃)
Manually turn the wheel 2 to 3 times to ensure there is no jamming
Loosen the exhaust plug, jog the start motor to exhaust, and then tighten it after continuous oil output
Start the machine without load and run it for 5 to 10 minutes to observe if there are any abnormal noises or leaks
Gradually load (each time ≤30% of the rated pressure, with an interval of ≥2 minutes). It is strictly prohibited to directly load the cold machine to full capacity
Operation monitoring
Oil temperature: Normal operating temperature is 30-55℃. If the temperature exceeds 70℃, the machine should be shut down to check the cooling system
Pressure: Not exceeding the rated value (28MPa), peak not exceeding 35MPa and cumulative time less than 10 minutes per hour
Noise: Smooth operation <80dB. Abnormal noise (>85dB) indicates possible wear or cavitation, and the machine should be stopped immediately
Leakage: Slight seepage (<15 drops per minute) is allowed. If the leakage increases, timely maintenance is required
3. Maintenance and care
Daily inspection
Check the oil level, temperature, noise and leakage conditions every shift, and record the operating parameters
Check if the connecting bolts are loose and tighten them in time
Clean the surface of the motor to prevent the accumulation of oil stains from affecting heat dissipation
Check the pressure difference of the filter to ensure the filtration effect
Regular maintenance
Every 250 hours: Check the pressure difference of the filter (<0.15MPa), and replace the filter element if necessary
Every 500 hours: Check the contamination level of the oil (≤ISO 4406 18/15 grade), and take samples for testing if necessary
Every 1000 hours: Change the hydraulic oil and clean the oil tank and filter at the same time
Every 2000 hours: Conduct a comprehensive disassembly inspection, measure the key fit clearances, and replace the worn parts
Oil Product management
Hydraulic oils of different brands must not be mixed to prevent the reaction of additives and the formation of sediment
In cold regions, low-viscosity hydraulic oil (such as L-HV series) should be used to ensure low-temperature starting performance
Regularly test the viscosity and acid value of the oil to ensure they meet the usage requirements
The cleanliness of hydraulic oil is of vital importance, and filters must be inspected and replaced regularly
4. Special Precautions
Prevent dry running
It is strictly prohibited to start the motor without oil. Even a short period of dry running will cause severe wear of the plunger and five-star wheel
After a long period of inactivity, when restarting the motor, clean hydraulic oil should be filled into it
Before starting, it is necessary to confirm that the fuel supply system is working properly
Prevent cavitation
Ensure that the oil suction pipeline is well sealed to prevent air from entering the system and forming bubbles
The oil suction height should be less than 500mm, and it is recommended to be less than 300mm to reduce the oil suction resistance
When the oil temperature is too low (<10℃), run it no-load for 15 minutes first to increase the oil temperature before loading
Load matching
It is strictly prohibited to operate beyond the rated pressure and speed; otherwise, the service life will be significantly shortened
Avoid frequent overload impacts and protect the precision mating parts inside the motor
Theoretically, it is not allowed for the maximum torque and the highest rotational speed to occur simultaneously to avoid overload
Shutdown protection
Before shutting down, the oil should be unloaded to a low pressure (<20bar) and run for 3 to 5 minutes. Only when the oil temperature drops below 60℃ should the power be cut off
When the motor is not in use for a long time, the oil inlet and outlet ports should be sealed to prevent foreign objects from entering the interior
When the equipment is out of use for a long time in winter, anti-freezing measures should be considered to prevent the internal moisture from freezing and damaging the parts