Generally, the return oil temperature of vertical roller mill is not allowed to exceed 60 °C. It is recommended to install a temperature scale or a thermometer, which can directly measure the oil temperature, which is convenient for recording and maintenance.

To check the oil quantity and cleanliness, the oil quantity and cleanliness can be checked through the oil flow indicator, the observation hole on the hollow journal bush cover, the oil level indicator in the fuel tank, etc.

Check whether there is oil leakage, sand and water in the sealing parts of the oil pump, oil circuit and each lubrication point.Before each start of the vertical roller mill, grease must be injected into the motor bearing, pinion bearing, etc., and the sealing and cleanliness of the oil filling place must be ensured.

The oil level and lubrication condition of each lubrication point of the vertical roller mill should be checked at least once every 4 hours.