5.3Start Procedures
Start the auxiliary pump before or simultaneously with start of the STP pump.
Open the vacuum valve located at the outlet port flange side after starting the auxiliary pump.
NOTICE
◇DO NOT open the vacuum valve without operating the auxiliary pump.
Doing so may cause a reverse flow of oil, which could contaminate the inside of the STP pump.
5.4Stop Procedures
Close the vacuum valve located at the outlet port flange side just before or after stopping the STP pump.
After closing the valve, stop the auxiliary pump.
CAUTION 
◇DO NOT stop the auxiliary pump without closing the vacuum valve. Depending upon the type of the auxiliary pump, doing so could cause a reverse flow of atmospheric air into the STP pump, which may result in a malfunction.
NOTICE
◇DO NOT stop the auxiliary pump without closing the valve.
Doing so may cause a reverse flow of oil, which could contaminate the inside of the STP pump.
