How to replace oil & filter on the GVS 40A vacuum pump

Regularly changing the oil and filter on your vacuum pump will help keep it running well for years to come. On this page we will walk you through how to change the oil and filter on all Atlas Copco GVS 40A vacuum pump variants. We recommend using this tutorial in combination with the instruction manual (6996022430).

Before you begin any service on your vacuum pump, make sure to take proper safety precautions. Switch off the electrical supply to the vacuum pump and let the system cool to a safe temperature. This will take approximately 1 hour. 

Regular oil and filter changes are essential to maintaining optimal performance and preventing unplanned downtime. Replacing the oil on time not only removes harmful build-up but also prepares your equipment for its next sprint.

Additionally, our genuine vacuum pump oil offers top-tier lubrication. Furthermore, it is tested and qualified for optimal sealing, cooling, and oxidation properties that your pump requires—all of which can degrade over time and with additional contamination. 

That’s why our recommended service intervals are designed to maximize pump availability in the most cost-effective way, helping you avoid costly damage from internal friction, thermal stress, and leaks.

Stay ahead of maintenance and keep your operations running smoothly while decreasing the majority of risk at a low cost.

Are you unsure about performing the services yourself? Our field service engineers can assist you with this. Reach out for support or enquire about our ServicePlan™ offerings where we take care of your vacuum pump needs so you can focus on your production. 

1. Strap wrench

2. Allen key set

3. 12mm spanner

4. Syringe

1. Start by removing the oil filler plug using a 12mm Allen key.
2. Place a tray with a minimum volume of 1.5 L underneath the drain. 

1. Continue with the service by using a 6mm Allen key to unscrew the bolts and remove the exhaust flange.
2. Remove the exhaust flange and the exhaust filter.
3.  Remove the O-ring.
4. Use a syringe to remove the remaining oil from the casing.
5. Now disassemble the exhaust filter.
6.  Now place a tray with a minimum volume of 1.5L underneath the oil filter.
7. Use a strap wrench to remove the oil filter and pour the oil from the oil filter into the tray.
8. Clean the excess oil with a cloth and cleaning liquid. 

1. Begin by reassembling the exhaust filter and flange. The filter threaded stud can only protrude a maximum of 1mm above the nut.
2. Now apply vacuum grease to the filter.
3. Lubricate the O-ring with vacuum grease and fit it back onto the vacuum pump.
4.  Insert the exhaust filter.
5. Use a 6mm Allen key and 23Nm of force to tighten the bolts and secure the exhaust flange in place.
6.  Apply oil to the oil filter and fit it back in the vacuum pump.
7.  Apply vacuum grease to the O-ring.
8.  Fit the oil drain plug back onto the pump using a 12mm Allen key.
9.  Fill the vacuum pump back up with oil (approximately 1 to 1.5 L), or until the oil level reaches ‘max.’ This can be seen on the oil level sight glass.
10. Put the oil filler plug back on, using a 12mm Allen key. 

You have now completed an oil and filter change on your GVS 40 A vacuum pump! Remember to store your tools in a safe place, so that they are ready for the next service. Click here to know more about our service offerings to keep your vacuum pumps under best operating conditions.