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Maintenance
Maintaining the Vacuum
Pump
Checking Vacuum Pump Oil
Level
1. Look through oil level sight glass to verify
vacuum pump oil level.
2. Oil level should appear to be in the
middle of the sight glass.
3. If oil is low, add oil to vacuum pump, refer
to
Adding Oil to Vacuum Pump.
Adding Oil to Vacuum Pump
Follow this procedure to add oil to the
vacuum pump.
1. Turn power OFF to the
1090AT
diagnostic™ unit and remove power cord
from wall outlet.
2. Remove all screws located around the
lower edge of the plastic top cover.
3. Gently lift the plastic top cover off the
unit.
4. Lift the hinged control panel up and lay
towards the back of the unit.
5. Remove oil fill screw cap.
Figure 5: Vacuum Pump Fill Cap
6. Add oil to vacuum pump fill port until the
oil is visible halfway up the sight glass.
7. Install the oil fill screw cap.
8. Replace control panel to original position.
9. Replace plastic top cover and screws.
Changing Vacuum Pump Oil
The vacuum pump oil must be changed at
least every 6 months. The oil may have to
be changed earlier if the oil is no longer
clear when viewed through the sight glass.
1. Turn power OFF to the
1090AT
diagnostic™ unit and remove power cord
from wall outlet.
WARNING
• Wear safety goggles and protective
gloves, user and bystander. Everyday
eyeglasses only have impact resistant
lenses, they are NOT safety glasses. If
any refrigerant gets into eyes, flush
with water and seek a doctor’s aid
immediately, even though irritation
may cease.
• Prevent refrigerant from contacting the
skin.
• Read, understand and follow
Safety
Information in the front of this manual.
2. Put a container under the oil drain tube of
the vacuum pump.
3. Remove the oil drain screw cap and drain
oil.
✓
✓
✓
✓
Discard refrigerant oil in
accordance with local, state and
federal regulations that apply in
your area.
4. Install the oil drain screw cap.
5. Refill vacuum pump with oil, refer to
Adding Oil to Vacuum Pump.
For Reference Only