Product Features of YCM Hydraulic Motor

The YCM hydraulic motor has high housing strength and strong load-bearing capacity of internal dynamic components, with a wide continuous power range. The main features of the motor are as follows:

Adopts a crankshaft and a five-cylinder, five-piston mechanism with low excitation frequency, maintaining the original low-noise characteristic;

Has a large starting torque and excellent low-speed stability, enabling stable operation at very low speeds;

Utilizes a planar compensable oil distribution structure, which offers high reliability, low leakage, and convenient maintenance. The piston and plunger sleeve are sealed with sealing rings, ensuring high volumetric efficiency;

The crankshaft and connecting rod are supported by rollers, providing high mechanical efficiency; the rotation direction is reversible, and the output shaft can withstand a certain degree of radial and axial external forces.

Causes of Weak Operation in Hydraulic Motors

(1) Loose fit of the stator body: During the motor's operation, all internal components of the gerotor hydraulic motor are in a state of mutual friction. If the quality of the hydraulic oil in the system is extremely poor, it will accelerate the wear of the motor's internal parts. When the wear of the needle rollers inside the stator body exceeds a certain level, the internal clearance of the stator body fit will increase, making it impossible to achieve the normal oil sealing effect and resulting in excessive internal leakage of the motor. The symptom manifested is that the motor operates normally under no-load conditions but produces slightly louder noise than normal; under load, it will suffer from weak operation or slow rotation. The solution proposed by motor manufacturers is to replace the needle rollers.

(2) Wear between the output shaft and the housing: The main cause of this fault is impure hydraulic oil—NHM motors may be contaminated with impurities, which cause concave grooves to form due to abrasion inside the housing. This leads to increased internal leakage of the motor, thereby resulting in weak operation. The solution is to replace the housing or the entire matching assembly.