18
2 INSTALLATION
2.6 Rotary servo motors with an oil seal
2.6
Rotary servo motors with an oil seal
For rotary servo motors with an oil seal, the oil seal prevents the entry of oil into the rotary servo motor. Make sure to install it
in accordance with this section.
Even if the oil seal on the rotary servo motor makes noises during operation, it does not indicate a problem with the functions.
Pressure and oil level
Install the rotary servo motor horizontally, and set the oil level in the gear box to be always lower than the oil seal lip. If the oil
level is higher than the oil seal lip, the oil enters the rotary servo motor and may cause a malfunction. Refer to the chapter of
the rotary servo motor series for the height above oil level.
High pressure against the oil seal causes abrasion and shortens the service life of the product. Keep constant internal
pressure by equipping a ventilator to the gear box.
Temperature
If the lip reaches a high temperature, the service life of the oil seal will be shortened. Maximum applicable temperature of
material of the oil lip is 100 °C, and the temperature of the oil lip increases by 10 °C to 15 °C at maximum rotation. Keep high-
temperature oil away from the oil lip.
2.7
Inspection items
• To prevent a malfunction, do not perform an insulation resistance test (megger test) on the rotary servo motor.
• Do not disassemble and/or repair the equipment on customer side.
Periodic inspection
Perform the following inspections.
• Check the bearings, brake section, and the like for unusual noise.
• Check the cables and the like for scratches or cracks. Especially when the cables are movable, perform periodic
inspections according to operating conditions.
• Check the rotary servo motor shaft and coupling for misalignment.
• Check the power connector and encoder connector tightening screws for looseness.
Gear Shaft
Rotary servo motor
Height above
oil level
Lip
Oil seal
