MRH2-4400 Industrial Hydraulic Motor for Heavy Machinery

The MRH2-4400 hydraulic motor is a device that converts hydraulic energy into mechanical energy through the principle of hydraulic transmission. Unlike electric motors, hydraulic motors are driven by the flow and pressure of hydraulic fluid (usually oil or water), offering advantages such as high output torque, wide speed range, compact structure, and easy stepless speed regulation. Here are some key features of the MRH2-4400 hydraulic motor:

lHigh power density: The MRH2-4400 hydraulic motor provides high power output, suitable for applications requiring high torque and low speed operation. Wide speed range: The hydraulic motor can achieve stepless speed regulation by adjusting the pressure and flow of the hydraulic system and the internal structural parameters of the motor, adapting to different working requirements.

lSelf-locking function: The hydraulic motor can self-lock when hydraulic pressure is lost, maintaining its current position, which is very useful for applications requiring precise position control.

lCompact structure: The MRH2-4400 hydraulic motor adopts a modular design, resulting in a compact structure that facilitates installation and maintenance.

lHigh adaptability: The hydraulic motor can withstand harsh environments such as high temperature, high pressure, and corrosion, and is widely used in engineering machinery, aerospace, shipbuilding, metallurgy, and other fields.

The MRH2-4400 hydraulic motor typically forms a hydraulic system with components such as a hydraulic pump, oil tank, and filter. The motor's operation and speed regulation are achieved by controlling the flow and pressure of the hydraulic oil. When selecting and using the motor, the model and parameters must be determined based on specific working conditions and requirements to ensure it meets application requirements and maintains good performance.

The MRH2-4400 is a two-speed hydraulic motor – most likely from the MRH2 series of radial piston motors (common in heavy-duty mobile equipment).
The “4400” typically refers to the maximum displacement in cubic centimeters per revolution (cc/rev) – i.e., 4400 cc/rev – which makes it a very large, high-torque motor.Unlike a fixed-displacement motor, the MRH2‑4400 has a two-speed (dual-displacement) feature, meaning it can operate in two different displacement modes – a high-torque, low-speed mode and a low-torque, high-speed mode.How does two-speed work?Low-speed / high-torque mode: all pistons are engaged – full displacement (e.g., 4400 cc/rev).
Great for starting heavy loads, climbing, or winching.High-speed / low-torque mode: a portion of the pistons are effectively disconnected (short-circuited) – displacement drops (e.g., to ~half or less). Great for travel or rapid cycling.
The shift is typically done hydraulically via an integral control valve or a manual/electric shift signal from the machine’s cab.Key characteristicsRadial piston design – very smooth low-speed operation, excellent starting torqueVery high torque output – ideal for demanding applicationsCompact and robust – designed for harsh environmentsSpeed range – can vary from a few RPM up to several hundred RPM depending on available flowBearings and shaft – designed for both radial and axial loads (often reversible) Typical applicationsTrack drives on excavators, dozers, and drilling rigsWheel drives for heavy mobile equipmentWinches and hoists – where you need both high line pull and fast spooling Rotary drills and mixersConveyor drives – when intermittent high-speed operation is requiredImportant notesThe exact specs (pressure rating, flow, torque, shift mechanism) depend on the manufacturer and the motor’s nameplate.
You’ll want to confirm with the datasheet.The “MRH2” series is often associated with brands like M+S Hydraulic (Italy), but other manufacturers may use similar naming – so check for a nameplate or manual.