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If a gear pump encounters problems such as oil failure during use, what are the reasons and how should we deal with it?
1.Double gear pump does not produce oil
If it is found that the gear pump does not come with oil during the debugging of the host, first check whether the gear pump's rotation direction is correct. Gear pumps are divided into left and right rotation. If the rotation direction is not correct, the pressure oil formed by the volume difference generated by the internal gear meshing will cause the oil seal to be damaged and leak oil. Secondly, check whether the oil filter at the oil inlet of the gear pump is clogged, which will cause difficulty or inability to suck oil, and the phenomenon that the oil suction hose is flattened.

2. The oil seal was washed out
(1) The rotation of the double gear pump is wrong. When the rotation of the pump is incorrect, the high-pressure oil will directly pass to the oil seal. Because the low-pressure skeleton oil seal can only withstand a pressure of up to 0.5 MPa, the oil seal will be washed out.
(2) Gear pump bearings are subjected to axial forces. The generation of axial force is often related to the over-tightening of the gear pump shaft extension with the coupling sleeve, that is, the pump shaft is hit with a hammer during installation or the mounting screw is pulled hard to subject the pump shaft to a backward axial force. As the shaft rotates, this backward axial force will force increased wear in the pump. Because the gear pump is sealed by the gear end face and the shaft sleeve end face, when the axial seal end face is worn seriously, the internal axial seal of the pump will generate a certain gap, resulting in communication between the high and low pressure oil chambers and the oil seal rushing . This situation occurs more often in the dump truck industry, mainly due to the irregular size of the coupling sleeve on the host.

(3) The double gear pump is subjected to excessive radial force. If the coaxiality of the gear pump is not good, it will cause the radial force of the pump to exceed the bearing limit of the oil seal and cause oil leakage from the oil seal. At the same time, it will cause damage to the floating bearings inside the pump.


3.Double gear pump heating
(1) The system is overloaded, which is mainly manifested in excessive pressure or speed.
(2) Poor oil cleanliness, increased internal wear, and reduced volumetric efficiency. Oil leaks and throttles from the internal gap to generate heat.
(3) The oil outlet pipe is too thin and the oil flow rate is too high. Generally, the oil flow rate is 3-8m / s.
Taixing Hengsheng Hydraulic Fittings Factory will update the knowledge about the double gear pump from time to time, welcome everyone's attention
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