Common troubleshooting gear pump (2)

(3) Other reasons High viscosity oil will also have noise, we must choose the right viscosity of the oil. 2, the lack of output flow ① high temperature will make it lower viscosity, increased internal leakage, reducing the pump output flow. Should identify the reasons for taking measures; for medium and high pressure gear pump, the seal to be checked for damage. ② the viscosity of oil selection is too high or too low, will result in reduced pump output flow, the viscosity should be qualified oil. ③ CB-B gear pump generally can not be reversed, such as the pump body mounted anti-pressure pump will cause the cavity and the local short circuit to reduce or reduce the flow to the oil to. At this point, should check the pump steering. ④ engine speed is not enough, resulting in reduced traffic. Reason should be identified and be excluded. 3, poor rotation ① axial clearance or radial clearance is too small. Re-adjust and repair. ② pump dirt. Disintegrate to remove foreign matter. ③ assembly error. Gear pump two pin hole machining reference plane is not assembly datum, such as the first pin into, and then tighten the screw, the pump will not move. The correct way is to turn the gear pump while tightening the screws, and finally with the pin hole and into the pin. ④ pump and engine coupling coaxial poor. Coaxiality should be guaranteed within 0.1mm. ⑤ Pump parts are not demagnetized. All parts must be demagnetized before assembly. ⑥ needle sleeve failed quality or needle broken. Repair or replace. ⑦ work oil outlet is blocked. Remove foreign body. 4, fever ① cause poor rotation of the gear pump can cause the gear pump fever, the exclusion method can also refer to its implementation. ② oil viscosity is too high or too low. Re-election oil. ③ side panels, bushings and gear face serious friction. Repair or replace. ④ high ambient temperature, small fuel tank, poor cooling, will make the pump heat. Should be handled separately.