1、 Installation and connection specifications

1. Inspection and Cleaning
   • Before installation, check if the motor is intact and release the brake to ensure that the output shaft rotates flexibly. If the storage time is too long, it is necessary to clean the internal oil to prevent the moving parts from sticking.
   • Ensure that the hydraulic system (oil tank, oil pipe, valve, joint, etc.) is clean and free of contamination to prevent impurities from entering the interior of the motor.
2. Coaxiality and force
   • The coaxiality error between the motor and the load should be controlled within ± 0.05mm. It is strictly prohibited to use pulleys to drive the load and avoid generating radial or axial forces on the motor.
   • If the actual axial/radial force of the load exceeds the allowable value of the motor, an elastic coupling should be used to connect the output shaft and the working mechanism.
3. Design of oil drainage pipeline
   • The oil drain pipe needs to be separately led back to the oil tank and cannot be connected in series with the oil return pipeline or connected to other valves to prevent sealing damage caused by excessive back pressure.

2、 Operational parameter control

1. Pressure and speed limits
   • It is allowed to exceed the rated pressure by 20% -30% in a short period of time, but the instantaneous maximum pressure cannot occur simultaneously with the maximum speed, otherwise it will reduce the service life of the motor.
   • To avoid simultaneous occurrence of maximum torque and maximum speed, the actual speed should not be lower than the low stable speed (to prevent crawling). If the system requires low speed, a deceleration mechanism can be added.
2. Oil replenishment and back pressure
   • When the brake motor works as a pump, it is necessary to ensure that there is sufficient oil replenishment pressure at the suction port (such as through a booster pump) to prevent cavitation or brake failure.
   • When operating at extremely low speeds, it is necessary to maintain a constant leakage rate, oil viscosity of at least 35 ℃, and appropriate return oil back pressure.
3. Load inertia management
   • When driving large inertia loads, parallel bypass check valves need to be added to the hydraulic system to prevent motor damage due to oil shortage during shutdown.

3、 Maintenance and upkeep

1. Oil management
   • Mineral based hydraulic oil with high quality, anti foam, anti-oxidation and high-pressure additives is used. The ideal working temperature is about 85 ℃, the allowable range is -40 ℃ to 105 ℃, and the viscosity is 12-60cSt.
   • Regularly check the cleanliness of the oil, maintaining at least NAS level 9 to prevent impurities from causing friction pair wear and increased leakage.
2. Regular inspection and replacement
   • Regularly inspect seals, gaskets, and casings to prevent leakage or performance degradation caused by excessive casing pressure.
   • When locking the motor for a long time, it is necessary to use spring-loaded hydraulic release mechanical brakes to prevent load movement.
3. Fault handling
   • When a malfunction occurs during operation, it should not be disassembled at will. It is necessary to first investigate issues such as pressure, back pressure, and pollution.
   • If disassembly is required, it must be carried out after unloading and cutting off the power supply to avoid high voltage injuries.

4、 Safety operation standards

1. Braking and speed limit
   • When a hydraulic motor is used as the power source for lifting or walking devices, a speed limiting valve should be installed to prevent accidents caused by heavy objects falling or vehicles speeding.
   • When braking for a long time, it is necessary to set up a separate brake to avoid relying on the motor's own leakage braking to prevent slipping.
2. Anti impact and dust-proof
   • When the inertia of the driven component is high, a safety valve (slow flushing valve) should be installed in the return circuit to prevent hydraulic shock from damaging the motor.
   • End mounted motors can be equipped with high standard dust seals to prevent soil and dust from entering under harsh working conditions.
3. operating sequence
   • When starting, first run at low speed for 15 seconds to establish system pressure (11 bar lower), then increase to idle check pressure, and finally adjust parameters at rated speed.
   • Before stopping, it is necessary to run lightly for at least 15 minutes to empty the air and avoid excessive oil bubbles.