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Maintenance of centrifugal pump technical standards are as follows: First, the rolling bearings 1, bearing and shaft with the use of base-hole system, bearing and shell with the use of the base axis system. Bearing size tolerances and rotational accuracy of the value according to the provisions of GB 307-84. 2, with the bearing journal and bearing housing bore according to the provisions of GB 1031-83, journal roughness Ra value of less than 1.6μm, bearing housing bore roughness Ra value of less than 2.5μm. 3, with GCr15 and ZGCr15 steel bearing rings and rollers, the hardness value of the ferrule and roller should be 61 ~ 65HRC; with GCr15SiMn and ZGCr15SiMn steel, the hardness value should be 60 ~ 64HRC. The hardness of the inspection methods and the hardness of the same parts according to the provisions of JB 1255. 4, check the bearing radial clearance and axial clearance should be consistent with the provisions of GB 4604-84. 5, rolling bearing inner and outer raceway raceway should be free from flaking, serious wear and tear, the inner and outer rings are not allowed to crack; Ball should be no wear and tear, cage no serious deformation, rotation no abnormal noise and vibration, stop gradually stop. 6, C class tolerance tapered roller bearings, roller and ring raceway contact accuracy, under the action of a certain load, the color check, contact traces should be continuous, the contact length should not be less than 80% of the roller bus, . Second, the sliding bearing 1, for the radial thick-walled ①using pressure lead method, lift the shaft method or other methods to measure the bearing clearance and the amount of interference, the axial clearance meet the requirements, tile interference should be 0 ~ 0.02mm . ② check the various components, there should be no damage and cracks, bushings should be no flaking, pores, cracks, grooves and partial wear burn situation. ③ bearing bush contact with the color inspection method, check the angle should be no 60 ° ~ 90 ° (speed above 1000r / min take-off limit, speed less than 1000r / min to take the upper limit). In the contact area requires uniform contact, each square centimeter should have 2 to 4 contact points, if the contact is poor, you must scratch research. ④ clean bearing box, the hole smooth, no cracks, leakage phenomenon. ⑤ tile back and bearing housings should be closely and evenly fitted, with coloring inspection, the contact area of ​​not less than 50%. 2, for the radial thin-walled ①bearing alloy layer and tile should be firmly and tightly bonded, no delamination, shelling phenomenon. Alloy surface and two half watts in the facets should be smooth, smooth, does not allow cracks, pores, heavy skins, slag and bruises and other defects. ② tile back and bearing seat hole surface should be close and uniform fit, with coloring inspection, the inner diameter of less than 180mm, the contact area of ​​not less than 85%, an inner diameter greater than or equal to 180mm, the contact area of ​​not less than 70%. ③ bearings and journal with the gap and contact conditions are guaranteed by machining accuracy, the contact area is generally not allowed to scratch, if uneven contact along the axial, can be slightly modified. ④ After assembly, the surface of the divider with 0.02mm feeler inspection, should not be plugged as qualified. 3, for bearing thrust bearing ①There should be no wear and tear, deformation, cracks, scratches, delamination, rolling and burn defects; contact with the thrust plate should be printed at the same impression, the contact area should not be less than 70% Tile evenly distributed; the same group of pad thickness difference should not exceed 0.01mm, tile Babbitt should be rotated in accordance with the direction of round into the wedge to facilitate the entry of oil; back bearing surface smooth. ② adjust the gasket should be smooth, flat, not bending, with a thickness difference of not more than 0.01mm layer gasket. ③ After the assembly of the bearing cap repeatedly push the shaft method to measure thrust bearing clearance, the value should be within the required range. The thrust bearing clearance measured by this method and measured by the shaft displacement probe must be the same, and adjust the indicated zero of the displacement probe as required. ④ bearing shell horizontal joint surface tight, good bit. Oil temperature measuring oil hole and tile cover eye alignment, not skewed. Oil hole clean and smooth.