Viking The pump is a reverse pump that transfers liquid or pressurizes it by changing and moving the working volume formed between the pump cylinder and the meshing gear. Two enclosed spaces are composed of two gears, pump body and front and rear covers. When the gear rotates, the volume of the space on the side where the gear is disengaged increases from small to large, forming a vacuum. The liquid is sucked in. The volume of the space on the meshing side of the gear decreases from large to small, and the liquid is squeezed into the pipeline. The suction chamber and discharge chamber are separated by the meshing line of two gears, and the pressure at the discharge outlet of the pump * depends on the resistance at the pump outlet. Repair instructions for Viking Viking pump shaft after wear:
The main reason for the wear of the pump shaft is the conflict wear between the two ends of the shaft and the support roller needle, which makes the shaft diameter smaller. If it is slight wear, the diameter of the shaft at this part can be increased by plating a layer of hard chromium, so that the shaft can be corrected. If the shaft is severely worn, it should be made from scratch. After rough and finish turning of the shaft blank, the bearing part should be heat treated, and then ground to make the surface roughness of the bearing fitting part not more than 0.32 μ m; The tolerance of shaft roundness and cylindricity is 0.005mm; The matching part with the gear shall be h7/h6, and the surface roughness ra shall not be greater than 0.63 μ m.

The internal and external wear of Viking pump mainly refers to the circular arc working surface in the oil absorption section. If there is slight wear, it can be used after deburring with an oilstone. The pump body is formed by cast iron blank, and should be replaced when severe wear occurs. If the two end faces of the internal gear of the pump are corrected by grinding, the width and dimension of the pump body should also be changed, which should be the same as the dimension removed by the grinding of the two ends of the gear. The two end faces of the pump body after the initial machining should meet the specified skill requirements.
　 　 The end cover is made of cast iron. After the wear phenomenon appears, the fine ones can be ground and flattened on the flat plate. When the wear is severe, they should be ground and flattened on the surface grinder. The plane contact between the polished end cover and the pump body shall not be less than 85%, the flatness tolerance, the straightness tolerance of the center line of the end face adjacent to the hole, the parallelism tolerance of the two end faces, and the parallelism tolerance of the center lines of the two shaft holes shall all be 0.01mm, and the surface roughness ra after grinding shall not be greater than 1.5 μ m.