1. Application It applies to delivering non-corrosive lubricating-oil or equivalent liquid without solid particles and fibres at temperature below 80℃ and with the viscosity of 5?0-6-1.5?0-3m2/s(5-1500cSt). 2. Application Scope It can give performance as transfer pump or booster pump in oil delivery system, and a fuel pump for delivery, pressurization and injection in fuel supply system. It can be also applied as hydraulic pump supplying hydraulic power in hydraulic system and in all industry fields as lubricating pump. 3. Structure Features 2CY series gear pumps are mainly composed of gears, axles, pump body, pump cap, bearing sleeves and axle-end seals, etc. The mitriding-treated gears have the advantage of higher hardness and wear property, and they rptate with the axles inside the replaceable bearing sleeves. All of pump抯 parts can be lubricated by delivered medium when working. Four bearing sleeves are installed suspended in pump body and can be automatically adjusted with facing gaps clearance complying with pressure change, therefore, It results in stable pump pressure, little discharge, flow pulsation and higher volume efficiency.