1. The system pipeline is too thin and too long, too much bending, local pressure loss and pressure loss along the way are large. The mechanical friction loss between relative motions is large because of the poor accuracy and assembly quality of components. The fitting clearance of fitting parts is too small, or the use of wear leads to excessive clearance, large internal and external leakage, resulting in large volume loss, such as the reduction of pump volume efficiency and rapid temperature rise.
2. According to the fast forward speed of the plastic bucket, the quantitative pump oil supply system with the capacity of the oil pump is selected. When it works, most of the excess flow will overflow from the overflow valve under high pressure and generate heat.
3. In the system, the unloading circuit fails or the unloading circuit is not set, so the oil pump cannot unload when it stops working, and all the flow of the pump overflows under high pressure, resulting in overflow loss and heating, resulting in temperature rise. 4. The volume of the plastic tank is too small, the heat dissipation area is not enough, and the capacity of the cooling device is too small. The high temperature of gas and working environment causes the rise of oil temperature. If the viscosity of the selected oil is improper, the viscosity will be high, the viscosity resistance will be high, and if the viscosity is too small, the leakage will increase, both of which can cause the heating temperature rise.