Regular maintenance helps keep your vacuum pump running efficiently
Regular maintenance is key to helping your vacuum pump perform at its best, reducing unnecessary wear and supporting a longer service life. Edwards vacuum pumps are designed for straightforward servicing, making routine maintenance easier to carry out.
On this page, we will guide you through how to replace the oil and filters on your Edwards nES65 single-stage oil-sealed rotary vane vacuum pump. We will cover the disassembly, oil and filter removal, replacement, and
reassembly procedures.
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Follow safety guidelines
Before carrying out maintenance on your Edwards nES65 vacuum pump:
- Switch off the power supply to the pump system.
- Allow the pump to cool to a safe temperature before servicing. This typically takes approximately one hour.
- Ensure you have a suitable container with a minimum capacity of 1.5 litres for draining the oil.
- Refer to the instruction manual for the correct oil specification for your pump.
Tools and materials required
| Tools: |
1. Oil collection tray (min. 1.5 L capacity) |
2. Strap wrench (for oil filter removal) |
3. Clean cloth |
4. Vacuum grease |
5. Oil filter and exhaust filter |
6. Allen Key Set |
7. Spanner 12mm |
8. Syringe |
Oil Information
Pump Category |
Oil Information |
Quantity |
nES65 |
Ultragrade Performance 70 – 5l |
2 Liter in the pump |
nES 65 Hazloc |
Ultragrade Endurance EXTEND 110 - 5l |
2 Liter in the pump |
*You can also find the information for the type of oil to be used in the instruction manual.
Watch the step-by-step video tutorial
Oil and filter replacement procedure
Disassembly
- Remove the oil filler plug.
- Remove the threaded cap and connect the drain valve and hose.
- Remove the oil drain plug.
- Drain the used oil into a suitable container.
- Close the drain valve.
- Unscrew the bolts securing the exhaust flange.
- Remove the exhaust flange together with the exhaust filter.
- Remove the O-ring.
- Using a syringe, remove any remaining oil from the casing.
- Disassemble the exhaust filter.
- Remove the oil filter using a strap wrench.
- Drain any remaining oil from the filter into the collection container.
- Clean away excess oil using a suitable cleaning cloth and approved cleaning fluid.
Assembly
- Reassemble the exhaust filter and flange.
- Ensure the threaded stud of the filter protrudes no more than 1 mm above the nut.
- Apply vacuum grease to the filter.
- Lubricate the O-ring with vacuum grease and reinstall it.
- Insert the exhaust filter.
- Tighten the bolts to secure the exhaust flange.
- Apply a thin layer of oil to the new oil filter.
- Install the oil filter.
- Apply vacuum grease to the oil drain plug O-ring.
- Reinstall the oil drain plug.
- Fill the pump with approximately 1 to 1.5 litres of oil until the oil level reaches the MAX mark visible in the oil level sight glass.
- Reinstall the oil filler plug.
After servicing
After completing the oil and filter replacement:
- Dispose of used oil, filters, and other replaced components in accordance with local regulations.
- Store tools and maintenance equipment ready for future service activities.
- Check the pump for leaks before returning it to operation.
