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Plastic drum oil tank volume is too small, cooling area is not enough, cooling device but its capacity is too small. Climate and operating environment temperature is high, resulting in higher oil temperature. Improper selection of oil viscosity, viscosity of large viscous resistance, viscosity is too small, the leakage increases, both cases can cause heat temperature rise.

Plastic drum oil tank volume is too small, cooling area is not enough, cooling device but its capacity is too small. Climate and operating environment temperature is high, resulting in higher oil temperature. Improper selection of oil viscosity, viscosity of large viscous resistance, viscosity is too small, the leakage increases, both cases can cause heat temperature rise.

Plastic barrel system pipeline is too thin and too long, too much bending, local pressure loss and along the pressure loss is large. Component precision is not enough and assembly quality is poor, the mechanical friction loss between the relative movement is large. The fit clearance of the parts is too small, or the use of wear and tear leads to excessive clearance, internal and external leakage, resulting in volume loss, such as pump volume efficiency is reduced, the temperature rises quickly.

Plastic barrel according to the fast-forward speed selection of oil pump capacity of the quantitative pump oil supply system, in the work will have most of the excess flow at high pressure from the relief valve overflow back and fever. The system unloading circuit failure or because of not set unloading circuit, stop working when the oil pump can not unload, all the flow of the pump in the high pressure overflow, overflow loss and heat, resulting in temperature rise.