1, the gear pump output flow generated insufficient reasons: (1) internal and external rotor tooth-side clearance is too large, so that the suction pressure oil interoperability. The volumetric efficiency is significantly reduced, the output flow is not enough; (2) the axial clearance is large; (3) the combination of the suction pipe at the junction of the laxity and other reasons, so that the pump into the air, effective inhalation flow reduction; (4) smooth. As a result of the oil viscosity is too large, the filter is blocked by dirt and other causes of reduced suction flow; (5) relief valve stuck in the half-open position, the pump part of the flow through the relief valve to return to the tank, The system's flow is not enough, at this time accompanied by system pressure on the failure. 2, the gear pump output flow failure troubleshooting: (1) replace the internal and external rotor, the gear backlash within the specified range (generally less than 0.07mm); (2) grind both ends of the pump body to ensure that the internal and external rotor assembly rear axle To the gap in the range of 0.02 ~ 0.05mm; (3) replace the damaged suction pipe seal, with PTFE bandaged pipe thread part and then tighten the pipe joints; (4) select the appropriate viscosity of the oil, wash into the oil Oil filter to smooth oil absorption. And as appropriate, increase the suction pipe diameter; (5) repair the relief valve to exclude part of the relief valve short tank caused by the pump to reduce the effective flow of the phenomenon.
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