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There are two types of oil pumps for hydraulic trucks
Truck oil pump is now divided into two categories in the market, one is steel plate welding pump, the other is integral casting pump. The steel plate pump is divided into inner and outer layers. The inner layer is under pressure and the outer layer stores oil. In short, the outer oil is sucked into the small oil cylinder and then pumped into the large oil cylinder. The three gears of the handle adjust the position of the steel ball in the valve core to control the direction of the oil.
The integral casting integral pump is divided into upper and lower layers, which are separated by the piston rod and sealing ring. In short, the oil in the upper layer is sucked into the small cylinder and then driven into the lower layer. The third gear of the handle is not much different from the steel plate structure, but the integral pump improves a great disadvantage of the steel plate pump, that is, there will be no oil leakage when the seal of the pressure cylinder is damaged,.