Gear Pump Oil Injection system functions as follows:Once the mixing recipe calls for oil injectionRam goes up, the gear pump pumps the oil into the mixer thru the oil injectorRam is released to go down after 7 seconds or time to obtain a 10 to 12 second ram up/down cycleOnce the sensor senses no flow or low pressure, the air purge condition is activated for an additional 1 to 2 seconds using maximum line pressureAt the end of this air purge time the oil injection cycle is complete.