External lubrication oil pump troubleshooting method

The installation position of the external lubrication oil pump is too high from the oil level, especially when the pump rotation speed is reduced, because the vacuum degree of the pump suction chamber cannot be ensured to cause insufficient oil suction and air is sucked. At this point, the relative height between the pump and the oil level should be adjusted to meet the specified requirements.
Inhalation of air is a common failure of external lubricant sump pumps. The following is a description of how to eliminate the inhalation of air.
1. The pump body of external lubrication residue pump is in direct contact with the end caps. If the flatness of the contact surface fails to meet the requirements, the pump can easily draw in air during operation; similarly, the end cap and pressure of the pump The lids are also in direct contact with each other, and air is also easily intruded. If the glands are plastic products, the seals may enter the air due to their damage or deformation due to temperature changes. The method of this failure is excluded: when the pump or the pump cover flatness of less than the specified, ZYB residue oil pump type supercharger emery may be used in the plate-shaped press line and milled, may be in a plane Grinder grinding, so that its flatness does not exceed 5μm, and the need to ensure the verticality of the plane and the hole requirements; For the pump cover and the cover at the leak, can be coated with epoxy resin and other adhesives for sealing.
2. External lubrication oil pump is generally sealed with a skeleton oil seal on the pump shaft. If the spring that clamps the lip falls off, or the oil is reversed, or the lip is strained or deteriorated, the back end of the oil seal will always be under negative pressure and air will be sucked in. Generally, the new oil seal can be replaced to solve the problem.
3. The installation position of the residue pump is too high from the oil level, especially when the pump rotation speed is reduced, because the vacuum degree of the pump suction chamber cannot be ensured to cause insufficient suction to suck in the air. At this point, the relative height between the pump and the oil level should be adjusted to meet the specified requirements.
4. If there is not enough oil in the fuel tank, or if the suction nozzle is not inserted below the oil level, the pump will draw in air. At this time, add oil to the oil marking in the fuel tank; if the oil return nozzle shows oil, sometimes Air backflow into the system due to instantaneous negative pressure in the system, so the return pipe should generally be inserted below the oil level.
5. The suction filter is blocked by dirt or its capacity is too small, resulting in increased suction resistance and inhalation of air; in addition, the larger diameter of the inlet and outlet ports may also bring in air. At this time, the oil filter can be cleaned, or the oil filter with a larger capacity and an appropriate inlet and outlet diameter can be selected. In this way, the external lubricating residue pump not only prevents inhalation of air, but also prevents noise.

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