OMM Orbital Hydraulic Motor Not Working? Common Causes And Repair Solutions

OMM Orbital Hydraulic Motor Not Working? Common Causes and Repair Solutions

The OMM orbital hydraulic motor, a compact and high-speed hydraulic orbital motor, is widely used in applications that demand reliability and performance in limited space. Manufactured with an integrated construction and low-speed high-torque capability, the OMM series is a well-known choice in agricultural and industrial equipment. However, from time to time, users encounter a situation where the motor suddenly stops rotating during operation. Understanding the root causes and how to repair them is essential for efficient orbital hydraulic motor repair and maintenance.

Below are the most common causes and practical repair methods to resolve issues when an OMM orbital motor fails to rotate properly.

1. Internal Blockage within the Motor

One of the primary reasons an OMM orbital motor may stop working is internal blockage. This could be due to clogged directional valves, pressure valves, flow control valves, or even blocked internal hydraulic passages.

When these components are obstructed, hydraulic oil cannot flow freely, or the flow rate is drastically reduced. This results in insufficient pressure reaching the motor’s internal components, preventing it from rotating or even starting.

Solution:
Carefully inspect the hydraulic motor's internal components, especially the control valves and internal fluid channels. Clean or replace any malfunctioning parts to restore oil flow and ensure consistent pressure delivery.

2. Low Internal Pressure Due to Relief Valve Settings

Another common failure point involves the relief valve settings inside the OMM hydraulic orbital motor. Relief valves serve a protective function by preventing system pressure from exceeding safe limits. However, if the valve is set too low, it may activate prematurely, allowing hydraulic oil to bypass the motor and return to the reservoir.

This pressure drop prevents the motor from building enough torque to rotate.

Solution:
Adjust the relief valve to a higher setting appropriate for your system’s operating requirements. However, avoid setting it too high, as excessive pressure can damage the internal structure of the motor.

3. Improper Hydraulic Oil Viscosity

Hydraulic oil functions as both the lubricant and energy medium for any hydraulic orbital motor. If the oil viscosity is too high, it increases flow resistance, while low-viscosity oil fails to provide sufficient lubrication and sealing.

Both conditions can cause the OMM motor to stop or operate inefficiently.

Solution:
Select the recommended grade of hydraulic oil suitable for your application. High-quality oil from reputable brands ensures optimal performance and longevity of the motor.

4. Air Contamination in the Hydraulic System

Air entering the hydraulic system can lead to cavitation, unstable pressure, and inefficient power transmission. In such cases, the OMM orbital motor may fail to generate sufficient torque and exhibit irregular motion or stalling.

Solution:
Bleed the system by increasing the flow rate and running the motor under no-load conditions for approximately 30 minutes. This process helps expel trapped air from the motor and the system. Afterward, allow the system to cool naturally before resuming normal operation.

Final Thoughts

Whether you're using an OMM orbital motor for agricultural, construction, or industrial machinery, consistent performance depends on proper maintenance and understanding of how the motor functions. Issues such as pressure loss, improper oil selection, or internal valve failure can all be diagnosed and addressed with basic troubleshooting.

If your hydraulic orbital motor has stopped working, follow the above steps for inspection and repair, or consult a professional technician for advanced diagnostics. Regular maintenance not only prevents downtime but also extends the service life of your motor.

For more expert tips on orbital hydraulic motor repair, troubleshooting guides, and product support, stay tuned to our blog.