The main task of gear oil pump maintenance is to check whether the working face of gear, meshing gap, pump body, end cover, side plate, pump shaft and bearing and shaft seal have scratches and cracks. Scratches or cracks should be repaired, serious for new accessories. The sealing surface of the mechanical seal should be checked, and those with scars should be re-ground. Those who cannot be ground should replace the parts, and the tightness of the sealing rubber ring on the shaft appearance should be appropriate. If the packing seal is used, it is necessary to check whether the shaft working face at the contact with the packing is damaged, and the hardened packing should be replaced. When changing the new material, the packing gland can not be too tight at a time, so as to avoid the heat expansion or burn out when the packing box starts to work. Check the size of the fit gap at the relative moving parts, and update the accessories if it exceeds the regulations. The bending deformation of the pump shaft should be straightened or replaced.
The high pressure gear oil pump should also check whether the floating sleeve or side plate is deformed, abrged or damaged, and the sealing rubber ring of the clearance compensation device is hardened or loses its elasticity.
The reversible gear oil pump with a one-way valve should check whether its action is flexible. If it is not tightly closed, it should also be ground or replaced.
When necessary, the pressure of the opening and closing of the safety valve shall be added to the calibration, and the calibration shall be carried out with the standard pressure gauge when the pump is working. Before calibration, the relief valve spring should be loosened, and then slowly increase the spring pressure, until the opening valve pressure and the specified so far. When proofreading, the discharge valve of the pump should be closed, and then check the pressure of the safety valve. Proofreading should be repeated several times until satisfied.
The assembly clearance of gear oil pump should meet the requirements of the specification. If there is no such information, it can be adjusted according to experience. The axial clearance of the general gear end face and end cover is 0.04-0.15 mm, and the rotor pump is 0.02-0.04 mm. The specific value should depend on the working conditions of the pump, the size of the working pressure, the viscosity of the oil and the processing accuracy of the pump. Low value for high temperature heat conduction oil pump. Lubricating oil pump and old pump, the axial clearance of the end face increases to 0.100.20mm can be satisfied with the work.
General gear oil pump without clearance compensation device, determine the size of the axial clearance of the end face, generally can be measured by the soft lead wire method, the diameter of the lead wire should be less than 0.5 mm, if the end clearance is too large, can adjust the thickness of the sealing gasket of the end face, if necessary, can also grind the end face of the pump body to solve.
For small gear oil pump can also be based on the experience of managers to check whether the end gap is appropriate, that is, after the pump is reassembled, the hand pump shaft feels flexible, no jumping or clamping phenomenon, and then push the pump shaft can not feel the pump shaft has before and after the phenomenon of movement, that is, the gap can be considered appropriate.
The radial clearance of the tooth tip and the side wall of the gear oil pump. Generally 0.08-0.15 mm between. The radial clearance of the rotor pump is between 0.03 and 0.10 mm.
