A machine hydraulic pump system including at least one hydraulic pump driven to pressurize hydraulic fluid. A drain port is in fluid communication with an interior lubricating cavity of the pump. A selectively activatable flow control member is in flow-controlling relation to the drain port. The selectively activatable flow control member is adapted to move from a fluid containment condition to a fluid withdrawal condition prior to activation of the pump to at least partially evacuate lubricating liquid from the interior of the pump in response to the temperature of the lubricating liquid dropping below a predefined lower limit.