Dalan oil pump motor to analyze the cause of gear pump failure

What causes the gear pump to malfunction, and the Dalan oil pump motor will give you an analysis.
What causes the gear pump to malfunction, and the Dalan oil pump motor will give you an analysis. The causes of the gear pump failure are as follows:

1. The hydraulic oil tank has a low oil level;

2. The hydraulic oil is not used according to the season;

3. The oil inlet pipe is seriously blocked by dirt;

4. The oil pump drive gear oil seal is damaged and the air enters the hydraulic system;

5. The oil-injector inlet and outlet joints or the bent joint “O”-shaped seal ring are damaged. The fastening bolts of the bent joint or the inlet and outlet oil pipes are not tightened, and the air enters the hydraulic system;

6, the oil pump leaks, the seal ring aging;

7. The end face of the oil pump or the end face of the main and driven gear bushings are worn or scratched, and the unevenness of the end faces of the two bushings is excessive;

8. The internal parts of the oil pump are incorrectly assembled to cause internal leakage;

9, "left-handed" installed "right-handed" oil pump, resulting in the destruction of the skeleton oil seal;

10. The hydraulic oil is dirty.

The troubleshooting method is as follows:

1. Add or replace the oil that meets the required grade according to the season to the specified oil level. Remove the foreign matter in the oil pipe and tighten the bolt or nut at the joint;

2. Replace the aging or damaged skeleton oil seal or "O" seal rubber ring;

3. Replace the worn gear oil pump or oil pump bushing. When the wear is slight, smooth the end face on the flat plate. The unevenness of the unevenness is 0.03mm; the end face of the upper bushing is lower than the upper plane of the pump body (normal value is less than 2.5~2.6mm). If it is out of tolerance, it should be compensated by adding 0.1~0.2mm copper piece to the lower bushing. Should be placed on the rear bushing;

4. The unloading piece and the sealing ring must be installed in the oil inlet cavity, and the two bushings can be balanced. The relief gasket should have a preload of 0.5mm;

5. The guiding wire elastic force should be able to twist the upper and lower bushings at a slight angle to the rotating direction of the driven gear at the same time, so that the processing planes of the two bushings of the main and driven gears are closely fitted;

6. The unloading groove on the bushing must be installed on the side of the low pressure chamber to eliminate the harmful dead volume when the gear meshes;

7. Before pressing the self-tightening oil seal, it should be coated with a layer of lubricating oil on the surface, and also pay attention to the oil-resistant edge toward the front cover, which cannot be reversed;

8, "right-handed" pump can not be installed on the "left-handed" machine, otherwise it will destroy the skeleton oil seal;

9. Before loading the pump cover, pour a small amount of oil into the pump casing and turn the meshing gear by hand;

10. Before installing the oil pump cover without tightening the bolt, check whether the gap between the pump cover and the pump body is between 0.3 and 0.6 mm. If the clearance is too small, replace the large seal ring and the pressure relief member. After the hydraulic oil pump is installed, it should be flexible and free from sticking.

----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant

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