Rexroth hydraulic pump is mainly divided into three types: piston pump, gear pump and vane pump, among which Rexroth vane pump is a special clamp clamping pump body and pump cover, and the outlet direction of the pump can be in any direction of 360 degrees, which is easy to install and use. The bearing assembly of the sand pump adopts a cylindrical structure, which is convenient for adjusting the gap between the impeller and the pump body, and can be removed as a whole during repair.
When it is confirmed that there is a problem with the Rexroth vane pump (or motor), the general steps to diagnose and clean up the problem are as follows:
(1) Do a good job of preparation before diagnosis. By reading the product samples, operating manuals and relevant archives of Rexroth vane pumps or hydraulic motors, we can grasp the following situations: the structural principles and functions of Rexroth vane pumps (or motors); Sourcing and promise, production date, primary skill function; Operation status, original records, problems that occurred during operation and how to deal with them, etc. Because the same problem may be caused by a variety of different reasons, and these different reasons caused by the same problem has a certain difference, so when dealing with the problem, we must first find out the problem, carefully and carefully investigate, fully grasp its characteristics, understand the operation status before and after the problem, find out under what conditions the problem is generated, and clarify all the elements related to the problem.
(2) Analysis and judgment. On the basis of on-site inspection, conduct a preliminary analysis and judgment of the causes that may cause the problem, and preliminarily list the causes that may cause the problem. The following points to note when making analysis and judgment.
a. Fully consider the influence of external factors on the system, and then focus attention on the system to find out the cause when it is indeed not the cause of the problem.
b. When analyzing and judging, it is necessary to consider mechanical, electrical, hydraulic, and pneumatic aspects together, and must not consider hydraulic pressure alone.
c. Distinguish whether the problem is occasional or inevitable. For the inevitable problems, it is necessary to carefully analyze the causes of the problems and completely eliminate them; For occasional problems, as long as the cause of the problem is found out and dealt with accordingly.
(3) Adjust the experiment. Adjust the pressure, flow rate and action cycle of the Rexroth vane pump (or motor) that is still working after the above analysis and judgment to adjust the pressure, flow rate and action cycle, so as to separate the false and retain the true, and further prove and find out the more likely causes of the problem. The adjustment experiment can be carried out according to the listed causes of the problem, in the order of first easy and then difficult; If you are not sure, you can also directly experiment with the most suspicious parts first, and sometimes you can remove the problem by adjusting it.
(4) Disassemble and view. Open and view the defective areas that have been further identified after the adjustment experiment. Attention should be paid to dismantling: record the dismantling sequence and draw sketches, pay attention to maintaining the original condition of the part, carefully inspect the relevant parts, do not touch and scrub the relevant parts with dirty hands or dirty cloths, and avoid dirt sticking to the parts.
(5) Deal with faults. Adjust, correct or replace the corresponding parts of the faulty parts that are found to be found and do not deal with them hastily.
(6) Retry and function test. In accordance with the requirements of the technical regulations, the problem is handled carefully and carefully. After the problem is dealt with, the experiment and test are re-conducted. Pay attention to investigate its role and compare it with the original problem. If the problem has been eliminated, it proves that the analysis and treatment of the problem is correct; If the problem has not been removed, the other suspicious areas should be treated in the same way until the problem disappears.
(7) Analysis and summary. After the problem is removed, the problem should be carefully analyzed and summarized qualitatively and quantitatively, so as to draw a correct conclusion on the cause and law of the problem, so as to improve the ability to deal with the problem and prevent the recurrence of similar problems.
(8) In the process of diagnosing and correcting faults, special attention should be paid to safety, cleanliness and orderliness.
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Working characteristics of Rexroth hydraulic motors
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2. Check whether the valve is sensitive
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Cause:
There are two causes of particle contamination: one is brought in from the outside, and the other is generated during the work process.
Atmospheric dust is brought in through the vents of the tank.
Mixing during storage and transportation.
Sludge and sediment resulting from chemical changes.
Exist...
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