Gardner Denver VST110 Operating And Service Manual page 47

DRAINING AND CLEANING OIL SYSTEM - Always drain the complete system. Draining when the oil is
hot will help to prevent varnish deposits and carry away impurities. To drain the system, use one of the
following methods:
1. Be sure the unit is completely off and that no air pressure is in the oil reservoir.
2. Disconnect, lockout and tagout the power supply to the compressor package.
3. If the unit is not elevated high enough to use the oil reservoir drain line to drain oil, a small hand,
electric or air operated pump should be used to drain reservoir through the oil filler opening or from
the drain valve.
4. If the unit is elevated so that the oil reservoir drain can be used, empty the oil reservoir through the
drain valve to a suitable container or sump.
5. If the drained oil and/or the oil filter element are contaminated with dirt, flush the entire system,
reservoir, oil cooler, mixing valve and lines. Inspect the oil separator element for dirt accumulation;
replace if necessary. If a varnish deposit exists, contact the factory for recommendations for
removal of the deposit and prevention of varnish.
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