Edwards nES Series, Instruction Manual, Page: 40 / 56

Operation
Duty
*
Normal Medium Harsh
Change oil, oil filter (if installed) and exhaust filter
▪ Mineral oil: Ultragrade
Performance 70
4000 hours 2000 hours 1000 hours
▪ Alternative: Ultragrade Extend
110
8000 hours 4000 hours 1000 hours
Clean the pump, the radiator and
the motor fan guard
2000 hours 1000 hours 500 hours
Check the vanes and replace them
if required
15000 hours 10000 hours 5000 hours
Check belt condition
(nES470
‑
nES750)
Every
2000 hours or
6 months
Every
2000 hours or
6 months
Every
2000 hours or
6 months
*
Whichever comes first, 4000 running hours or 1 year.
Note:
We recommend that you monitor the oil condition through the sight glass and change
the oil when it becomes discoloured or milky. Not changing oil in time can lead to
premature blocking of the air exhaust filter and even failure of the vacuum pump.
Check for condensed water vapour on the bottom of the oil tank through the oil viewer
(high water handling capability versions only). If there is condensed water vapour, open
the oil discharge valve slightly, let the condensed water vapour flow out and close it
again as soon as oil starts to come out. Check the oil level and top up if necessary.
6.2 Oil specifications
Use of the genuine recommended lubricants is strongly recommended. They are the
result of years of field experience and research. Refer to Preventive maintenance
schedule on page 31 Preventive maintenance schedule on page 35 for the advised
replacement intervals and consult your spare parts list for part number information.
Note:
Avoid mixing lubricants of different brands or types as they may not be compatible, and
the oil mix will have inferior properties.
Always drain the pump well. Used oil left in the pump shortens the lifetime of the new
oil.
nES series pumps are delivered with mineral oil, Ultragrade Performance 70, or with
synthetic oil, Ultragrade Extend 110. Check the pump nameplate.
Page 36 - 07/2020
A35104880_B - Maintenance