Rexroth axial piston pump after long-term application will be the implementation of components posture sluggish, the pressure can not go up? How should be overhauled such common failures, improve the Rexroth axial piston pump inlet and outlet pressure? Therefore, the elephant hydraulic equipment for the big guys to collect and organize the Rexroth axial piston pump pressure can not raise the cause and its check the way, how should go to solve, for reference only!
1, check with the baffle plate and cylinder catering surface (G1 surface and G2 surface) of the touching condition
When there is waste in the middle of the two sides to, weld surface calendering and pull a shallow pipe groove, pressure suction oil cavity between there is a leak, the higher the pressure within the leak is bigger, should be cleaned and decontaminated, and will have been calendered and bruised with each other surface to carry out grinding maintenance;
2, check the Rexroth axial piston pump and the cylinder body hole in the middle of the mutual cooperation
The two dragging mutual fit surface damage or contusion into the radial through groove, so that the piston pump diameter d and cylinder body hole in the middle of D mutual fit gap expansion, resulting in pressure oil leakage to the pump body cavity according to this gap, internal leakage expansion, resulting in the total output flow is insufficient. This can be repaired by brushing the outer circle of the plunger in d, removing and replacing the plunger pump, or by matching the plunger pump to the cylinder body. Ensure that the gap between the two is within the required range (the standard gap between D and d is generally 25 ~ 26μm);
3、Check the suction friction resistance
Although the Rexroth axial piston pump has a certain self-like working ability, but such as suction pipeline is too long and too many bends, suction oil high aspect ratio is too high (> 500mm) and other reasons lead to oil suction safety channel ut part of the damage and pressure loss damage is too large and thus the piston pump suction oil difficult, resulting in part of the suction air, resulting in insufficient total output flow. In addition, the general Rexroth axial piston pump is prohibited to install all oil filters in the suction line, otherwise it will also lead to hydraulic oil pump suction empty, which is different from other week type hydraulic oil pump. At this time, in order to deal with the piston pump sucked into the waste will be, can be in the car tank suction pipe around the separation of a large indoor space, surrounded by a filter closed up, as with the application of general oil filter the actual effect - the same. For the total flow rate of more than 160L/Inin piston pump, the official choose backflow natural suction.
4, check after disassembly reassembly is not appropriate
After disassembly and reassembly of Rexroth axial piston pump, if the hole with the oil plate is not right on the pump cover installed positioning pins, so each other against each other, can not make the oil plate and cylinder catering, resulting in high pressure and low pressure oil wiring together, can not play oil.
5, check the gasoline pump management center bullet yellow is not broken or fatigue
6, tighten the screw is not stuck tight, the cylinder body axial force caused by the cylinder body twist, in the cylinder body and with the oil plate in the middle of the covenant-shaped gap, the expansion of the internal leakage, and cause the total output flow is not enough, so tighten the screw should be according to the top angle method gradually twist tight.
7, the oil temperature is too high, the plunger pump internal leakage to expand and make the total output flow is insufficient, should find ways to reduce the oil temperature.
8, the oil suction pipe exposed in the air tee joint is not twisted tight or tight sealing off the air inlet; or into the oil delivery pipe cracked and air interchange, or electric welding welding at not welded firmly. That can not produce vacuum value in the pump (because of interchange with air), the pump suction chamber and the external atmospheric pressure close to the same, can not pressure vapor into the pump hate.
9, for the Rexroth axial piston pump provided by the auxiliary pump oil, may be the auxiliary pump keyed to the Rexroth piston pump main valve to provide insufficient oil, resulting in insufficient pump oil pipeline volume or pressure on the bad.
