Fig. 29 Changing the cooling oil, pressuring the oil separator tank
2 Pressure gauge
3 Hose coupling (oil separator tank venting)
6 Plug-in nozzle
7 Shut-off valve
A Shut-off valve open
B Shut-off valve closed
8 Maintenance hose
10 Shut-off valve (venting line)
Changing the oil with internal pressure Oil change with an external compressed air
source
The machine has been running at least 5 mi‐
nutes in LOAD mode.
The machine is fully vented,
the pressure gauge on the oil separator tank
reads 0 bar.
1. Close the shut-off valve 10 in the venting
line.
2. Start the machine and watch the oil separa‐
tor tank pressure gauge 2 until it reads 3–
5 bar.
3. Switch off the machine.
4. Wait at least 2 minutes to allow the oil to
flow back to the separator tank.
5. Switch off and lock out the power supply
isolating device and verify the absence of
voltage.
Cut-off the electrical power supply via the power
supply isolating device,
ensure that the device is locked off,
verify the absence of any voltage.
The machine is fully vented,
the pressure gauge on the oil separator tank
reads 0 bar.
An external source of compressed air is availa‐
ble.
1. Close the shut-off valve 10 in the venting
line.
2. With the shut-off valve closed, insert the
plug-in nozzle 6 into the hose coupling 3 .
3. Connect the maintenance hose to the exter‐
nal air supply.
4. Open the shut-off valve 7 until the pressure
gauge on the oil separator tank reads 3 –
5 bar.
5. Close the shut-off valve 7 and remove the
male hose fitting from the coupling.
Draining the oil from the separator tank
Contact KAESER SERVICE if condensate is detected in the cooling oil.
It is necessary to adapt the airend discharge temperature to individual ambient conditions.
10 Maintenance
10.16 Changing the cooling oil
901824 12 E
Operating Manual Screw Compressor
ASK
75
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