The hydraulic column can't lift the cause

Answer:

The hydraulic pump suction line is tightly sealed to prevent entering the air. (2) to design the tank properly, the return tubing should be made to the box wall at a 45-degree Angle and to be inserted into the oil in the wall of the box. The speed should not be too high to prevent the oil from being poured into the tank while the air is mixed in. The board should be set in the tank. Make the bubble float in the oil without going into the suction tube. (3) the fuel tank of the oil to add to the oil line is shown in the height of the suction pipe must be immersed in the tank, two-thirds of the depth of hydraulic pump oil absorption liquid to the distance as short as possible, in order to reduce oil absorption resistance. If the fluid viscosity is too high, low oil fluid should be replaced. The filter is blocked to remove the dirt in time. This effectively prevents excessive air immersion. (4) use the anti-foam good oil solution, or add the antifoaming agent in the oil.

The suction of the hydraulic pump Hydraulic pump suction empty refers primarily to the pumped into oil mixed with air, this phenomenon is not only easy to cause cavitation, adding noise, but also influence the volumetric efficiency of hydraulic pump, the working oil metamorphism, so it is not allowed phenomenon in the hydraulic system. Main reason: the fuel tank design and tubing arrangement is unreasonable, lack of the oil tank: suction tubing in oil tank is too shallow, hydraulic pump oil absorption position is too high, the oil viscosity is too big: hydraulic pump flow area of oil suction mouth is too small, make oil absorption confusing: oil filter surface is dirt blocking: pipeline leaks or return pipe not immersed and cause a lot of air into the oil in the tank

These are the basic reasons, but one or two are likely to be large, and others are not to be excluded from the work. Common failure and elimination of hydraulic system: Most of the fault in the hydraulic system is not sudden, and there are always signs. Such as noise, vibration, impact, crawling, pollution, gas hole and leakage. If properly controlled and excluded, the system failure can be eliminated or reduced. One, vibration and noise Reasonable selection of hydraulic elements (2) the method of eliminating the cavitation phenomenon of the hydraulic pump suction line: (1) increase the diameter of the suction pipe, reduce or avoid the bending of the pipe path, to reduce the rate of oil absorption and reduce the loss of pipe resistance. (2) use an appropriate suction filter and always check for cleaning and avoid clogging. The suction height of the hydraulic pump should be as small as possible. The hydraulic pump with low suction performance should be supplied by low pressure auxiliary pump.

The motor's own overloading has been set too low to cause the tripping, stopping the pump, which may also have been caused by the poor quality of the components. 4, the system other valve or flow oil does not smooth the pressure overloading system overload stop pump; 5, the wiring problems, in order to become overloaded;

Adjust the overflow valve, the pressure of the system from small to large, to normal working pressure, the overflow valve is set up; 2, the system does not work, the system should be a pressure relief, if this period of time (light) also stop the pump and motor doesn't work, could valve jam, check and try again after cleaning there should be no problem;