First, the centrifugal pump head, pump housing and guide vane wheel 1, clean and check all levels of impeller, there should be no wear, cracks, erosion and other defects. 2, Centrifugal pump impeller anti-rotation should be no bending, broken and loose. Pump head, pump housing seal ring surface should be no pitting, scratches, grooves, the maximum allowable surface roughness Ra of 0.8μm, seal ring and pump head, centrifugal pump casing assembly clearance of 0.05 ~ 0.10mm, seal Ring should not be loose. 3, Centrifugal oil pump head, centrifugal pump pump housing only as a benchmark, measure the ring radial bore circle beating, the value of not more than 0.50 mm, the end of the round beating should not exceed 0.04 mm. 4, measuring the amount of the gap between the pump head, pump housing seal ring and its assembly seal ring, the value should be between 0.50 ~ 0.60 mm. Centrifugal pump impeller, clean and check the impeller surface at all levels, the impeller surface should be free of cracks, wear and other defects, impeller flow channel surface should be smooth, and no scaling, burrs, leaves should be no cracks, scouring thinning and other defects. 2. Inspect the impeller inlet and outlet seal rings at all levels without loosening. The surface of the seal ring is smooth and burr-free. The maximum allowable value of the surface roughness Ra is 0.8μm and the clearance between the impeller and the impeller should be 0.05 ~ 0.10mm. Impeller hole as a benchmark, check the impeller radial runout should not exceed 0.05 mm. End runout is not greater than 0.04 mm. 3, Impeller and shaft with interference fit, generally H7 / h6. Key and keyway interference with the amount of 0.09 ~ 0.12 mm, after assembly, centrifugal pump key top of the gap is 0.04 ~ 0.07 mm. 4, Impeller for static balance. Third, the centrifugal pump throttle seal 1, clean and check the throttle seal surface, there should be no cracks, partial wear and other defects, the maximum allowable surface roughness Ra 0.8μm; 2, centrifugal pump throttle seal H7 / p6 with the pump body. Take the outer circle as a reference and measure the radial runout of the inner bore. The value should not be more than 0.02mm. 3. Measure the clearance between the shaft seal and the pump shaft of the centrifugal oil pump. The value should be between 0.25 and 0.30 mm. Fourth, centrifugal pump shaft, cleaning and inspection of the pump shaft, the pump shaft should be free of cracks, serious wear and tear and other defects. If there is wear, cracks, erosion, etc., should be detailed records, and analyze the reasons. 2, testing centrifugal pump shaft straightness, the value should not be greater than 0.05mm in length. Journal surface shall not have pits, grooves and other defects, the maximum allowable surface roughness of 0.8μm, spindle circularity and cylindricity error should be less than 0.02mm. 3, Centrifugal pump keyway centerline axis parallel to the center line error should be less than 0.03mm / 100.
