Product Features of HCM Hydraulic Motor

The HCM hydraulic motor is a new-type product independently developed by our company with design improvements based on Italian technology, integrating years of practical experience. Its main features are as follows:

There is no lateral force between the piston and the swing cylinder; the bottom of the piston is designed with hydrostatic balance; and torque is transmitted between the piston and the crankshaft via rolling bearings. All these design elements reduce friction losses during power transmission. Therefore, the HCM series hydraulic motor features high mechanical efficiency and a high starting torque (with a mechanical efficiency of over 0.92 during startup).

The flat port plate is simple and reliable, which enhances sealing performance—resulting in excellent low-speed stability and minimal leakage. A plastic piston ring is used to seal the gap between the piston and the swing cylinder, achieving zero leakage. Thus, the motor boasts high volumetric efficiency (up to 0.98).

The structural design reduces friction losses and improves sealing performance, ensuring excellent low-speed stability. The motor can operate stably at a working condition of 1 r/min and has a wide speed regulation range (with a speed adjustment ratio of up to 1000).

The piston and bearing sleeve are tightly attached via a snap ring with no clearance. As a result, this series of hydraulic motors can operate under pump working conditions; when the oil inlet is closed, the motor can run at high speed under free-wheel working conditions.

The HCM series hydraulic motor supports high operating pressure, with a maximum pressure of up to 45 MPa. It also features light weight, compact size, and high power density.

Owing to its simple structure, reasonable design, and adoption of bearings with high load-carrying capacity, the motor ensures reliable operation, long service life, and low noise. Its drive shaft can withstand radial loads, and the rotation direction is reversible.

Check whether the air pressure is stable and normal at all positions.

Inspect the temperature changes at all positions. For locations without a temperature indicator, use a thermometer or the touch method to make a judgment. You can refer to the following feelings of the hand corresponding to different temperatures:

At 40℃: A warm sensation is felt;

At 50℃–60℃: A hot sensation is felt, but the surface can still be touched for 1–2 minutes;

At 80℃–90℃: An unbearable burning sensation is felt upon contact.

For some leak locations that are invisible or cannot be directly observed, the coating visualization method and blotting method can be used for inspection:

Coating visualization method: Stop the engine first, clean the leak location with a cleaning agent, apply pencil marks on the leak area, and then start the engine—this will allow you to clearly identify the leak point. This method is suitable for inspecting castings and unclear leak points (applicable to new hydraulic motors).

Blotting method: Stop the engine, clean the leak location thoroughly, and attach a piece of absorbent sponge or tissue to the leak area. After starting the engine, determine the time to remove the tissue based on the engine speed and leak volume. The oil stain on the tissue corresponds to the position of the leak point on the component. This method is mostly used for locations that cannot be directly seen (for hydraulic motor procurement scenarios).