Fig. 32 Changing the cooling oil, oil separator tank
1 Hose coupling (air cooler venting)
2 Pressure gauge
3 Hose coupling (oil separator tank venting)
4 Oil filler port with plug
5 Cooling oil level indicator
6 Male hose fitting
7 Shut-off valve
A Shut-off valve open
B Shut-off valve closed
8 Maintenance hose
9 Hose coupling (oil drain)
10 Shut-off valve (venting line)
11 Shut-off valve (oil drain)
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 40–
70 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 power supply disconnecting device is switch‐
ed off.
The disconnecting device is locked in the off po‐
sition.
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 40–
70 psig.
5. Close the shut-off valve 7 and remove the
male hose fitting from the coupling.
Draining the oil from the separator tank
1. Have an oil receptacle ready.
2. With the shut-off valve closed, insert the male hose fitting 6 into the hose coupling 9 .
10 Maintenance
10.15 Changing the Cooling Oil
9_5721 06 USE
Service Manual Screw Compressor
ASD T Tri-Voltage
75
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