High torque at low speeds, capable of handling heavy nets and harsh seawater—real-world performance of the ZMT series gerotor hydraulic motor in fishing vessel winches.

In both coastal and deep-sea fishing operations, tasks like hauling in nets and deploying gear may seem simple, but they actually place demanding requirements on the equipment. The system needs enough power to hoist heavy, water-laden nets, yet must offer controllable speeds and smooth start-stop capabilities; a sudden surge of power could snap cables or fling the catch overboard. Furthermore, constant exposure to salt spray and humidity makes sealing integrity and corrosion resistance critical factors. Over the past few years, we have primarily used our own ZMT series gerotor hydraulic motors to power winches on fishing vessels, and the feedback has been consistently solid. Here is a look at how they perform in the field.

Why fishing vessel winches favor gerotor motors

The operating conditions for winches on fishing vessels differ significantly from those of standard industrial winches. The load fluctuates during net deployment and retrieval-particularly the moment the net clears the water surface, when shock loads spike instantly. If a motor lacks strong low-speed performance, issues like "stick-slip" (jerky movement) or stalling can easily occur. The inherent structure of the gerotor hydraulic motor makes it ideal for these low-speed, high-torque scenarios: the meshing of the rotor and stator allows for high displacement and stable torque output even at very low speeds-maintaining smooth, steady operation even when rotating at just a few revolutions per minute.

We have made several targeted adjustments to the ZMT series to address these specific needs. Internal bearings and seals were selected specifically for high-humidity, high-salinity marine environments, and the shaft-end seal design prevents seawater and sediment from infiltrating the motor. The housing exterior can be coated with our specialized anti-corrosion paint, making it suitable for both freshwater and saltwater environments. Ultimately, what matters most to fishermen is durability and ease of repair-a motor failure at sea effectively ruins the entire trip-so we designed the unit for simple disassembly and assembly, allowing routine maintenance to be performed without specialized tools. Single-Lever Control for Forward, Reverse, and Stop

In terms of operation, the ZMT motor utilizes a manual directional control valve. A single lever manages forward rotation, reverse rotation, and the stop function. The center position corresponds to "stop"-a design that aligns perfectly with the habits of fishermen. There is no need to monitor gauges or memorize complex gear patterns; operators can intuitively switch between hauling in nets, deploying nets, and performing emergency stops based on the feel of the lever. Essentially, this system functions as a compact winch: the motor's output torque drives the drum-either directly or through a reduction mechanism-while the lever controls direction, enabling precise management of fishing nets and gear.

In practice, pushing the lever to one side causes the motor to rotate forward, driving the drum to haul in the net; pushing it to the other side reverses the motor to deploy the net. Releasing the lever allows it to return to the center position, instantly halting the motor. This prevents the drum from continuing to spin due to inertia, thereby avoiding loose or tangled nets. Such immediate responsiveness is crucial for safety during deck operations-particularly when working in teams-as the operator must be able to interrupt the action at any moment.

Conclusion

Fishing vessels operate in harsh environments; ultimately, equipment selection comes down to reliability and maintenance costs rather than how impressive the specifications look on paper. By combining the ZMT series gerotor hydraulic motor with manual lever control, the system makes winch operations simple and reliable. Whether for near-shore freshwater operations or deep-sea fishing, this setup minimizes the need for fishermen to worry about equipment maintenance, allowing them to focus their energy on the actual task of fishing.

For specific selection parameters, please contact our technical department; we can provide a tailored solution based on your vessel type and specific operating conditions.