Grease injection pumps offer the reliability grease lubrication supply. The pressure through the main grease pump accelerated in the nozzle, so that negative pressure is formed in the nozzle of mixing chamber. Negative pressure and the free jet entrainment will continue to tank mixing chamber and grease into the diffuser pipe, the mixed grease flow in the expansion deceleration boost pressure tube evacuation in the main pump for bearing lubrication grease.