Edwards nES Series, Instruction Manual, Page: 42 / 56

7. Adjustments and servicing procedures
7.1 Drive motor
On nES100 - nES750 (nES40 - nES65 do not have motor bearings) the motor bearings
must be changed every 20,000 hours. Check recommendations on the motor's website.
If installed, remove the motor condensate drain plug yearly. Keep the motor free from
dust for optimal cooling.
7.2 Exhaust filter replacement
nES40, nES65 and nES100
1. Unscrew the 4 or 6 screws of the filter cover and remove the filter cover together
with the O-ring.
2. Remove the exhaust filters from the filter cover.
3. Clean the exhaust filter O-ring lodge and the filter cover O-ring before
reassembling the new parts.
4. Install the new exhaust filters following the instructions delivered with them.
5. Reassemble the filter cover.
nES200
1. When the exhaust filter elements are clogged, the valves open and the filters are
bypassed. Oil mist at the exhaust, and high oil consumption are signs that the
exhaust filters are clogged.
2. The exhaust filters must be replaced more frequently if subject to increased oil
cracking products at high operating temperatures and aggressive media.
3. Remove the exhaust flange with gasket. Unscrew the lock nut and remove the
spring between both washers: take out the exhaust filter elements.
4. Take out the pressure relief valves and check that they move freely and seal
properly.
5. Reassemble in the reverse sequence. Ensure that the exhaust filter elements are
properly centred and positioned. Install the spring between both washers and
tighten the stop nut fully home with the 10 mm box wrench.
nES300, nES300S
1. Remove the screws of the exhaust plate using an 8 mm Allen key.
2. Lift the 3 exhaust filters from the W shaped metal sheet holder and remove them
from the oil casing.
3. Make sure that the new exhaust filters have the O-ring (opposite side of
overpressure valve) and grease them using our vacuum grease.
4. Replace the O-ring of the exhaust plate.
5. Insert new exhaust filters. They are guided in the oil casing correct position. Make
sure the compression springs are behind the W shaped metal sheet holder.
6. Plug the exhaust plate on the W shaped metal sheet holder with the 2 location
pins and screw the exhaust plate on the oil casing using an 8 mm Allen key.
Page 38 - 07/2020
A35104880_B - Adjustments and servicing procedures