Edwards Vacuum Pump QDP40/QMB550

Cooling-Water System Inspection

Inspect cooling-water connections and pipelines

Tighten any loose cooling-water connections

Repair or replace corroded or damaged cooling-water components

Seal any leaks in cooling-water pipelines

Nitrogen Supply System Inspection

Inspect nitrogen supply connections and pipelines

Tighten any loose nitrogen supply connections

Repair or replace corroded or damaged nitrogen supply components

Release the NW40 clamps at the silencer inlet and outlet flanges to disconnect the silencer from the check-valve and the pump.

Slide the silencer out towards the high-vacuum end of the pump to remove the silencer from the pump.

Alternatively, undo the two support-plate retaining screws and slide the silencer complete with the support-plate towards the motor end of the pump.

Silencer Inspection and Cleaning

Silencer Dismantling and Cleaning

Remove and retain the six bolts and washers which secure each end-cover plate to the silencer body.

Remove the six screws securing the bearing end-cover to the high vacuum head-plate.

Lift away the end-cover and remove the sealing ‘O’ ring. Dispose of the ‘O’ ring.

Use a clean lint-free cloth or a plastic or wooden spatula to remove old grease from the end-cover and bearings.

Inspect the bearings for signs of wear or debris.

Are the bearings worn or damaged?

Ensure substances do not come into contact with skin or eyes.

Avoid inhaling vapours from substances.

Fit blanking caps to inlet and outlet flanges when moving the check-valve.

Release the NW40 clamp at the exhaust check-valve outlet flange.

Remove the check-valve from the system pipeline.

Use a suitable pump or syringe to suck the oil out of the gearbox

Discard the old bonded seal on the oil filler-plug

Replace with a new bonded seal from the pump maintenance kit

Fill the gearbox through the filler hole with the correct grade and quantity of oil

Is the oil level correct on the oil sight-glass?