The normal working temperature of jack oil pump is 10~50 ℃. If the oil temperature is too high, cooling measures shall be taken or the pump shall be stopped; If the oil temperature is too low, heating measures or low pressure operation shall be taken to increase the oil temperature. Before starting the motor, change the reversing valve to the middle half position. Jog several times to prevent the high-pressure pump from being emptied, and use it only after air is removed.

Jack refers to a small and light lifting equipment that uses a rigid lifting piece as a working device to jack off heavy objects through the small stroke of the top bracket or bottom claw. Jacks are mainly used in factories, mines, transportation and other departments for vehicle repair and other lifting, support and other work. Its structure is light, firm, flexible and reliable, which can be carried and operated by one person.