HIGH VOLUMETRIC EFFICIENCY MOTORS On radial piston hydraulic motors with high volumetric efficiency, and therefore Intermot IAM series, there can be a phenomenon of oil overheating in motor body. Oil coming from piston and distributor goes into motor body. When this oil quantity in very scanty, it means there is a good volumetric efficiency. In some cases this is positive because high volumetric efficiency avoids motor rotation even under external stress. In other cases, this high efficiency can cause problems on the motor because oil exchange is missing. In fixed application, for example, where the motor is running constantly for 8 or more hours a day high volumetric efficiency can create a temperature increasing in motor body. In this case, temperature increasing is to be avoided with the use of flushing. Flushing consists of carrying fresh oil (taken from the hydraulic circuit) in motor body. Oil is usually taken from return line to avoid any loss of efficiency. In this way, all internal parts of the motor are protected with this lubrication and cooled with fresh oil, so that total efficiency is optimized. volumetric efficiency of pump formula volumetric efficiency of hydraulic motor pump efficiency calculation pdf power efficiency of hydraulic pump hydraulic efficiency hydraulic pump calculations hydraulic motor calculations pump efficiency calculation