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8, when the hydraulic system and the need to use pressurized tank, the pressure P≤0.16 ~ 0.2MPA.
9, check the pump installed before mounting hole depth is greater than the pump shaft elongation, prevent jacking phenomenon, otherwise it will burn the pump.
10, a hydraulic pump into and out of the oil port should be firmly installed, the sealing means to be reliable, or will cause the intake air or oil leakage phenomenon, affecting the performance of the pump.
Hydraulic gear pump out the cause of the fault!
First, the gear shaft key segments and off-axis reasons
1 gear shaft fracture
????When the gear shaft and coupling installation If you do not pay attention concentricity requirements will gear shaft rotates. Sheared radial force.
If large misalignment soon will lead to the gear shaft fracture.
Thus, when the gear shaft and the coupling installation should pay strict attention to concentricity requirements recommended maximum radial shaft runout does not exceed 0.2 mm. The maximum permissible misalignment should be strictly controlled in accordance with the coupling installation requirements.
2 Push shaped shaft gear pump shaft groove is cut health or destroyed
????Tapered shaft gear pump shaft fastening nut if not tightened, keyway will continue to impact bonds. Parker eventually bond shear deformation or even completely destroyed. But overtighten the nut, will gear shaft subjected to excessive tensile stress, shear composite effect after radial misalignment caused and also easy to make the shaft fracture. Therefore, follow the installation instructions to tighten the nut recommended tightening torque.
3 voice Chi cavitation
????If the gear pump is not filled with fluid prior to running. Make a hydraulic system mixed with air, leading to cavitation. On the one hand cause too much noise; on the other hand is easy to produce the gear pump cavitation floating side damaged. Inlet pipe seals to remain intact, not a leak at, otherwise prone to cavitation.
Second, oil pollution
????Oil pollution is the main cause of failure of the gear pump through the drought. Here are some common characteristics of gear pumps internal parts damage caused by the oil pollution:
????a low-pressure side of the pump (part extends to the high side) deep grooves or large shallow but very intensive parallel scratches appear on the inner wall.
????b Gears badly worn.
????c floating ring the inside surface of the side plate, a series of concentric grooves dry.
????d of the outer circumferential surface of the floating plate, some worm-shaped grooves Bo.
????Teflon-coated plates float within P. DU bearings is completely scraped copper-tin alloy layer is clearly visible.
????Visible. Oil pollution is caused by the floating side external gear pump is mainly due to cable damage. In Table I under investigation. Side damage as high as 67%, so the oil pollution must be strictly controlled.
????The direct cause of the oil pollution is a hydraulic system in the mixed people of various pollutants. Among the greatest harm solid contaminants, their sources are mainly the following aspects of children:
????1) The system hard tube wall attached sheet rust, pickling chemicals left in the tube.
????2) Hard pipe cutting, welding and threading, etc. during the remaining Canadian iron.
????3) seals, seals residue. Since the binding site of sharp edges and size restrictions and other conditions tightening may damage the seal portion, damage