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Maintenance methods for 10 Rexroth radial piston pumps without oil and insufficient flow

1. The oil volume in the oil tank of the Rexroth radial piston pump has not exceeded the oil mark line and should be filled up.

2. For radial piston pumps with valve-type oil distribution, the suction and discharge check valves may be faulty. As long as there is a steel ball or cone valve core missing, it will not be able to absorb oil; when the contact between the steel ball and the valve seat is sticky with dirt or worn with deep pits, it may not be able to absorb oil or fully absorb oil resulting in insufficient output flow. At this time, the Rexroth radial piston pump should be dismantled and repaired. If any parts are missing, they should be replaced; the steel balls with serious wear should be replaced. Grind the tapered surface of the spool.

3. The spool of the variable control valve of the Rexroth radial piston pump is stuck. If it is stuck and does not move, all operating parts should be removed and cleaned.

4. The sliding block of the Rexroth radial piston pump is too tight, and the movement of the eccentric mechanism is greatly hindered. The slider should maintain a proper gap to make it move flexibly.

5. The control plunger of the hydraulic cylinder of the variable mechanism of the Rexroth radial piston pump is severely worn, the gap increases, the seal fails, and the leakage is serious, which makes the variable mechanism fail. At this time, the control plunger of the variable hydraulic cylinder needs to be replaced to ensure the assembly clearance. Prevent seal failure and leakage.

6. Due to the increase of the wear gap between the oil distribution shaft and the bushing, the pressure and oil suction chambers are partially connected, and the flow pressure cannot be increased. At this time, the bushing of the oil distribution shaft should be repaired, and it must be replaced when the bushing is seriously damaged by brush plating or electroplating.

7. The gap between the plunger and the rotor of the Rexroth radial piston pump increases due to wear and tear, resulting in increased internal leakage, resulting in insufficient output flow of the pump and pressure. At this time, the Rexroth radial piston pump should try to ensure the matching clearance between the outer circle of the plunger and the inner hole of the rotor hole.

8. Some holes in the cylinder that match the plunger are out of round or have a taper, or the plunger cannot move flexibly in the cylinder bore due to the dirt of the Rexroth radial plunger pump being stuck. At this time, the plunger pump should be dismantled and repaired, and the accuracy of the cylinder hole and the outer circle of the plunger should be repaired, and the assembly should be cleaned to ensure a proper assembly clearance.

9. The failure of the auxiliary pump makes the control oil pressure flow of the main pump insufficient, and the control of the main pump fails.

10. For radial piston pumps with various variable modes, if there is a failure of no flow output or insufficient output flow, it is mainly necessary to find out what causes the eccentricity between the stator and rotor, and why the Rexroth radial piston pump always fails. The reason for the condition of minimum eccentricity.

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