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Gear pump is a horizontal rotary gear pump, which is driven by the motor and the diesel engine driven two. Suitable for conveying a variety of oil and other lubricating medium, such as: heavy oil, oil, liquid temperature does not exceed 60 ℃ , But it is not suitable for high sulfur content, corrosive, containing hard particles debris, and fiber-containing liquid medium, is not suitable for the transmission of highly volatile, low flash liquid medium, for example: Gasoline, benzene and so on. Gear pump mainly consists of gear, shaft, pump body, pump cover, bearing sleeve, shaft seal and other components. Gear and shaft are subject to strict heat treatment, high hardness and wear resistance, together with the shaft installed in the sleeve. All moving parts in the pump are lubricated with the medium they supply. Hard tooth surface residue pump 2) The pump four bearing sleeve floating installed in the pump body, with the work pressure automatically adjust the end face spacing, so the pump pressure stability, small output flow pulsation, volumetric efficiency. Gear pump is through a pair of parameters and structure of the same involute gear rolling mutual engagement, the tank of low pressure oil to work can be an important part of high pressure oil. Is the engine of mechanical energy into hydraulic power unit. Gear pump flow, reliability is good. In the course of its use prone to wear failure, should pay attention to maintenance. Oil pump internal parts wear will cause internal leakage. Among them, the leakage area between the floating bushing and the gear end face is large, which is the main part of the internal leakage. This part of leakage accounted for 50% of the total internal leakage of about 70%. The wear and tear of the lost circulation gear pump volumetric efficiency decreased, pump output power is much lower than the input power. The loss of all the heat into the heat, it will cause the pump overheating. If the combination of flat compression, due to work floating sleeve will be a small amount of exercise caused by wear and tear, resulting in slow or can not enhance the farm tools, such a floating sleeve must be replaced or repaired.