Changing the oil with internal pressure
Changing the oil using an external compressed
air source
The machine has been running for at least 5 mi‐
nutes under LOAD.
The machine is fully vented, the pressure gauge
on the oil separator tank reads 0 psig.
1. Close the shut-off valve
10
in the venting
line.
2. Start the machine and watch the oil separator
tank pressure gauge
2
until it reads 43–72
psig.
3. Switch off and lock out the power supply dis‐
connecting device and check that no voltage
is present.
4. Wait at least 2 minutes to allow the oil to flow
back to the separator tank.
The supply disconnecting device is switched off,
the device is locked off,
a check has been made that no voltage is present.
The machine is fully vented, the pressure gauge
on the oil separator tank reads 0 psig.
An external source of compressed air is available.
1. Close the shut-off valve
10
in the venting
line.
2. With the shut-off valve closed, insert the male
hose fitting
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 43–72
psig.
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.
1. Have an oil receptacle ready.
2. With the shut-off valve closed, insert the male hose fitting
6
into the hose coupling
9
.
3. Place the end of the maintenance hose in the oil receptacle and secure it in place.
4. Open the shut-off valve
11
.
5. Slowly open the shut off valve
7
in the maintenance hose to release oil and close immediately
when air escapes.
6. Close the shut-off valve
11
and unplug the male hose fitting.
➤ Dispose of used oil in accordance with environmental protection regulations.
10 Maintenance
10.14 Changing the cooling oil
68
Service manual Screw compressor
Aircenter SX 3/7.5 SIGMA CONTROL BASIC
Number: 9_6945 01USE
