Service/Oil Change - Refco RL-4 Bedienungsanleitung

m Always turn off and disconnect power before moving or servicing the REFCO vacuum
pumps.
m The vacuum pump and especially the front cover can reach temperatures of up to
70°C (160°F) during operation.
Check the appropriate oil level (half level of sight glass) and make sure that there is
enough oil. Should the oil be cloudy, dark or contaminated, or should the oil level have
increased without refilling, change the oil immediately.
Ensure that the air intake of the impeller fan at the back of the pump is not covered with
any objects or cloths etc. Preventing the air flow through the pump can lead to an auto-
matic motor shut off by the thermo couple.
m Caution! Automatic restart after cooling time of approx. 20 minutes.

Service/Oil change

The main service point of a vacuum pump is the oil. Vacuum pump oil must be changed
at least after every 20 hours of service or whenever the oil in the sight glass is cloudy
or dark. The oil must be changed immediately after an evacuation of a heavily contami-
nated system. Residue of moist/water in the oil may cause corrosion and damage to the
vacuum pump.
m Contaminated oil may damage the vacuum pump.
Change of oil
• Run the pump until operating temperature has been reached. Turn the pump of and
disconnect from mains.
• Unscrew the oil mist filter (Pos. 19)
• Drain oil through drain plug (RL-4/RL-8 Pos. 23) or through opening for oil mist filter
(model RL-2 does not have an oil drainage plug and the oil must be drained through
opening of oil mist filter).
• Connect pump to the mains again and turn on. Let the pump run for 10-15 seconds with
open intake port in order to drain oil residue in the pump head.
• Turn the pump off and disconnect from the mains.
• Drain possible oil residue.
• Remount oil drain plug (Pos. 23).
• Refill with oil to half level of sight glass.
• Refit oil mist filter (Pos. 19). Let the pump run for a few seconds.
m If the oil has been strongly contaminated the oil change procedure must be repeated
after a run time of 30 minutes in order to assure that all waste particles inside the
pump have been washed out with the oil.
In order to achieve best performance with the REFCO vacuum pumps only use REFCO oils
DV-44, DV-45, DV-46, DV-48 or REFCO ester oil.
m Waste oil must be disposed of according to the rules and regulations which apply in
the country of use of the pump.
Further service work than oil change has to be executed by a specialised company.
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