When should you change oil in the vacuum pump?
In order to ensure long-lasting and reliable pump operation, it is necessary to pay attention to the level and quality status of the lubricating oil. During operation, both solid contaminants entrained in the refrigeration system as well as damp or acidified refrigerant flow through the pump, which adversely affects all pump elements and mechanisms. To monitor the condition and quality of the oil, a sight glass is installed in the body of each pump. When the oil observed in the sight glass is contaminated, it turns brown and begins to foam. After a long period of work, it is absolutely necessary to replace it with a new one. Even without the above mentioned symptoms, it is recommended to change the oil after every 100 hours of vacuum pump operation.
Oil change procedure:
Step 1: Remove the blanking cap and start the pump for less than a minute to warm up the oil in it and then close the nut.
Step 2: After turning off the pump, unscrew the drain plug at the bottom of the housing and drain the used oil into the previously prepared vessel. To completely empty the container, tilt the pump towards the drain plug. After draining the pump do not forget to make sure it is screwed in properly.
Step 3: Remove the oil filler cap and fill the tank with fresh oil until the fluid level reaches half the height of the sight glass.