Tips for correct preheating of small and medium pump trucks
Aug. 12, 2021
During the idling process of the hydraulic pump, components such as bearings and oil distribution plates will inevitably generate heat due to movement friction. This heat is gradually transferred to the surrounding hydraulic oil, which will gradually increase the temperature and viscosity of the hydraulic oil.After the pump truck has been used for a period of time, the swash plate of the hydraulic pump can be adjusted to have a relatively small angle change, so that the hydraulic oil can flow, and the higher temperature hydraulic oil can be delivered to the hydraulic circuit.The hydraulic motor of the pump truck and the oil in the pipeline gradually heat up due to convection and conduction.The hydraulic motor of the pump truck and the oil in the pipeline gradually heat up due to convection and conduction.The hydraulic motor of concrete pump truck and the oil in the pipeline gradually heat up due to convection and conduction.Until finally, the hydraulic oil of the pumping system of the entire boom pump truck reached the working temperature, and the preheating work ended smoothly.
2. The operation method of the main oil pump to gradually increase the displacement
Due to the difference between the open system and the closed system, there are two operating methods for gradually increasing the displacement of the main oil pump.
(1) For the concrete pump truck of the open system, the pumping displacement is gradually increased from the position of "zero". At this time, the reversing valve starts to work, and the hydraulic oil after the reversing valve flows back to the oil tank, and the entire pumping The oil temperature of the hydraulic system gradually rises.
(2) For small pump trucks with closed systems, start the pumping action at the lowest displacement state.
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About Us：JIUHE is specialized in researching, manufacturing, sale and after sale for construction machinery, main products:trailer concrete pump, concrete line pump, concrete pump truck, concrete placing boom, wet shotcrete machine, ladder lift truck, Aerial lift truck and so on. Contacts: [email protected], +86-18153223261.