Edwards ELD500 Series

D135-10-880C - Maintenance
Page 90
As already stated before only synthetic oil (L31001) must be used for the wet pump in the
ELD500 WET.
After completion of all maintenance work the cover of the mechanical section must engage
properly in the openings at the bottom.
Oil change
The oil should be changed after the first 100 operating hours and then at least every
2000 - 3000 operating hours or after one year. At high intake pressures and intake
temperatures and/or when pumping contaminated gases, the oil will have to be changed
much more frequently.
Further oil changes should be made before and after long-term storage of the pump.
Contact us for more information in this matter.
Required tool: Allen key 8 mm.
Remove the oil-drain plug and let the used oil drain into a suitable container. When the flow
of oil slows down, screw the oil-drain plug back in, briefly switch on the pump (maximum 10
seconds) and then switch it off again. Remove the oil-drain plug once more and drain out the
remaining oil.
Screw the oil drain plug back in (check the gasket and re-install a new one if necessary).
WARNING:
When disposing of waste oil, observe the applicable regulations for the safety of the
environment. The oil change procedure is described in the following section.
WARNING:
Pump and operating agents may be contaminated. Hazardous substances may escape
from the pump and the oil. If there is the danger that the operating agent may present a
hazard in any way due to decomposition of the oil, or because of the media which have
been pumped, the type of hazard must be determined and all necessary safety
precautions taken. Use gloves, face protection or a respirator if required.
WARNING:
Change the oil while the pump is cold so as to avoid releasing adsorbed gases. If releasing
adsorbed gases is no problem, change the oil after the pump has been switched off and
while the pump is still warm.
WARNING:
Risk of suffering burns. With the pump warm from operation, both pump and oil can get
so hot that there is the risk of suffering burns. If required, wear gloves.
Note:
Check and top up oil only after having shut down the pump. When disposing of waste oil,
observe the applicable environment protection regulations.
When changing the oil use the same type of oil which was previously in the pump. If an oil type
change is desired, consult Edwards.