First, the quality requirements of parts and components 1, crankshaft cleaning crankshaft, blowing clean oil hole; with a magnifying glass macro inspection should be no cracks, if necessary, nondestructive testing; check both ends of the main journal radial runout, the allowable error of 0.03mm; The allowable error of two-axis journals is 0.03mm and the maximum bending should be less than 0.03mm. The parallelism between the center line of the camshaft and the centerline of the spindle should be measured with a horizontal scale with the allowable error of 0.15-0.20mm / m. The roundness And cylindricity is not allowed to exceed half of the main journal tolerance; if the ultra poor, for the installation of rolling bearings need to be plated or plated grinding repair, the installation of the sliding bearing can be directly grinding repair; round neck journal and cylindrical Degree, not allowed to exceed half of axle neck tolerance tolerance, if there is super-difference should be grinding and dressing; Shall not have deep scratches on the shaft can be used to eliminate oilstone grinding; Scratches up to 0.10mm and can not be eliminated with whetstone , Should be grinding; journal shaft diameter reduction of 3% of the original diameter, should be replaced. 2, connecting rod should be non-destructive testing inspection, no cracks and other defects; connecting rod big head and small head centerline of the two holes is not parallel to the degree of 0.30 mm / m; check connecting rod bolt hole, if the hole is damaged, the application Reamer reaming bolt with a new bolt. 3, connecting rod bolt bolt non-destructive testing inspection, does not allow cracks and other defects; According to the previous maintenance records, check the connecting rod bolt length, length elongation value exceeds the specified value can not continue to use. 4, the crosshead cross-head body with a magnifying glass macro inspection, does not allow cracks and other defects; cross-pin non-destructive testing, does not allow cracks and other defects, measuring its roundness and cylindricity should meet the requirements; cross-pin and Connecting rod hole contact surface color inspection, should be in good contact, if the connecting rod hole is oval, reamer available after repair with a new pin, a new set; check the spherical surface of the pad, does not allow dents and other defects; Check the crosshead and skateboard contact wear and skateboard bolts, etc., should meet the requirements. 5, the plunger plunger end of the sphere, does not allow dents and other defects; plunger surface hardness requirements HRC45 ~ 55; plunger surface roughness of not more than 0.8; plunger should not have bending deformation, the surface should not have Dents, cracks, such as pulling hair, dents and other defects, can be grinding; plunger cylindrical tolerance to 0.15 ~ 0.20mm, circularity allowable error of 0.08 ~ 0.10mm. 6, the shaft seal filler must be fully updated in the overhaul, and the filler should be made into the corresponding packing ring; stuffing box sealing liquid system, the sealing liquid passage must be unblocked; Guide sleeve hole Babu alloy if the razor, Serious wear and tear, etc., you need to replace the new guide sleeve; adjustment nut should be checked, no cracks and other defects allowed. 7, cylinder body color inspection inspection, if cracks are found, in principle, to replace the new cylinder, but such as carbamide carbamide pump, etc., due to expensive cylinder material, should not easily scrapped; for minor cracks , In order to prevent the extension of cracks, grinding wheel can be used after grinding continue to use, but in the future each inspection should focus on inspection, the defect may not have regeneration or development; cylinder overhaul should be carried out when the pressure test, the test pressure of 1.25 Times; cylinder roundness and cylindricity should not exceed 0.50 mm, or should be carried out knife, knife after a new cylinder liner. 8, import and export check valve port, seat should be determined as the extent of damage is to grind or knife; if the spring, screw cracks and other defects, you must replace the new; upper and lower valve sleeve and the end of the outer surface does not allow Razor, dent and other defects; gasket rupture, puncture or loss of certain plastic defects, you should replace the new pieces. 9, Sleeve main bearing outer ring and cover, the base should be close fit, check with the color method, the contact area of ​​not less than 70% of the surface area of ​​75%, contact spots should be evenly distributed; main bearing cover and machine Surface contact should be handled clean; scraping of the bearing should meet the quality requirements; connecting rod bearing should be closely attached to the seat back, with the coating method of inspection, the contact area of ​​not less than 70% of the surface area of ​​75% contact Spots should be evenly distributed. Second, the quality requirements of the assembly Horizontal three-piston pump with the gap should be consistent with the provisions of Table 1--1. Note: 1, d for the crank journal diameter; 2, H7 / k6 with tolerance code, the following table with this. Third, the assembly of Notes 1, check, tighten the seat anchor bolts, the level of the foot were placed on the spindle hole and crosshead chute, check the horizontal and vertical horizontal machine, the horizontal allowable error of 0.05 mm / m, longitudinal tolerance is 0.10 mm / m; if the allowable error is exceeded, it should be adjusted. 2, check and adjust the various parts of the gap, should meet the requirements in Table 1--1. 3, After measuring the length of the connecting rod bolts, and make records. 4, the assembly, should be removed when the mark made by the components in place, should not be free to swap positions. 5, the assembly, the cross head spherical spherical pad and the plunger to a slight gap between the ball can not be crushed; its purpose is to make the plunger and the crosshead center retained in the installation of small deviations in operation can be a certain amount of compensation .