Asphalt Gear Pump Maintenance

Gear wear maintenance:
Gear wear and tear parts mainly tooth meshing of the working face and the gear involute, the plane.Mild wear, tooth surface grinding oil bill chan, two platforms and lapping repair the light on the tablet.Face serious wear and tear of the gear should be replaced when new gear, if only the ends of the gear surface wear, light on the surface grinding machine grinding.
Axis wear maintenance:
asphalt gear pump axis wear mainly because on both ends of the shaft and friction and wear between the supporting roller, the smaller the diameter of axle.If it is a mild wear, mooring Thai bond by a layer of hard chromium plating, to increase the shaft diameter size, the shaft.If worn axis, it should be 45 steel or 40 cr steel to manufacture, shaft blank after the coarse and fine car, bearing parts to heat treatment, hardness of HRC60-65, and then after grinding, make bearing fit parts surface roughness Ra is not more than 0.32 microns;Shaft roundness and cylindricity tolerance is 0.005 mm;Cooperate with gear parts according to the H7 / h6, surface roughness Ra should be no greater than 0.63 microns. Here I would like to suggest that the asphalt gear pump is often used with china hot oil pump.
Pump with needle bearing repair replacement:
In the pump parts after repair, needle roller bearings should be replaced.Requirements for needle is: all the size of the needle diameter error must not exceed 0.003 mm, length tolerance is 0.1 mm, should cooperate with axial clearance in O.O LMM around;Needle assembly according to quantity requirement with the bearing shell, needle between parallel arrangement.