Rexroth Piston Pump FAQs

Create Date: 2024-8-30 12:03:23|Source: Rexroth/Rexroth

Rexroth piston pump failure manifests itself as follows.

The causes and elimination methods of excessive working noise of piston pumps.

There is air in the oil pump. This failure usually occurs when a new pump is installed. When opening a new pump, oil should be added to the pump first to lubricate the pump's bearings, plungers, and cylinders.

Solution: Open the oil filler port of the pump when the pump is running, and discharge the air in the pump from the oil filler.

The oil level of the oil tank is too low, the suction pipe is blocked, the oil suction resistance of the pump becomes larger, the suction pipe section of the pump leaks, and the pump sucks air.

Solution: Add enough oil; clean the filter and unclog the air intake duct; Check and tighten the intake.

Improper installation of the oil pump and motor, that is, the concentricity of the pump shaft and the motor shaft is inconsistent, resulting in noise caused by radial force on the oil pump bearing.

Solution: Check the concentricity of adjusting the oil pump and the motor installation.

The viscosity of the hydraulic oil is too large, the self-priming ability of the pump is reduced, and the volumetric efficiency is reduced.

Solution: Choose a hydraulic oil with the right viscosity. If the oil temperature is too low, the heater should.

Causes and elimination of unstable pressure gauge pointer when shaft piston pump is working.

The oil distribution pan and cylinder block or plunger and cylinder block are seriously worn, resulting in excessive internal and external leakage.

Solution: Check and repair the mating surface of the oil distribution pan and the cylinder block; Single-cylinder grinding and replacement plunger; Tighten the screws of each joint to eliminate leaks.

If it is an axial piston variable pump, it may be that the variable angle of the variable mechanism is too small, resulting in too small flow rate and a relative increase in internal leakage. Therefore, the oil supply cannot be continuous, and the pressure is unstable.

Solution: Appropriately increase the variable angle of the variable mechanism to eliminate internal leakage.

The oil inlet pipe is blocked, the oil absorption resistance increases, and the air leaks. This may result in instability of the gauge pointer.

Solution: The oil inlet pipe is blocked, the liquid flow resistance is large, the oil pipe can be dredged to clean the inlet filter, check and tighten the connecting screw of the oil inlet pipe section, and the inclined shaft plunger motor exhausts the leakage.

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