ULTRASOURCE Ultravac 500, Owner'S Manual

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4.9
MAINTENANCE
Changing Vacuum Pump Oil
1. Open the machine (see page 4.8).
2. Loosen and remove the Oil Filler Cap with a 15/16-in. open end wrench.
3. Loosen the Oil Drain Plug located to the front and lower middle on the pump with a
1-in. open end wrench. Remove the plug slowly to control the flow of oil.
4. With the oil drained, replace the Oil Drain Plug and wipe away any excess oil.
5. Fill the pump with oil until the level is between the minimum and maximum lines on the
Oil Sight Glass. Replace the Oil Filler Cap.
6. Plug the power cord back into the wall receptacle.
7. Cycle the machine a couple of times, unplug, and check the Oil Level. Add oil if
necessary. Replace the rear panel using the provided screws.
Replacing Potentiometer
Refer to Parts, “Analog Control Panel,” for the disassembly of the panel. Remove the
potentiometer by unbending the mounting tabs holding the potentiometer to the circuit
board. Pull the potentiometer out of the circuit board.
MOUNTING TABS
Figure 4.8