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How to solve the abnormal working state of the tractor gear pump?

The gear pump is the power source for the operation of the hydraulic system. In the work of the tractor hydraulic system, the gear pump failure is manifested in the following three forms: insufficient oil supply or insufficient pressure; no oil absorption or insufficient oil absorption; gear pump burnout.

(1) The possible reasons for the insufficient oil supply or pressure of the gear pump are as follows: the small sealing ring is damaged or failed, resulting in the failure of the sealing pressure isolation function of the gear pump; the sealing structure between the front cover or the shaft sleeve and the gear is damaged; the waist of the shaft sleeve is damaged. The blockage of the rubber is invalid, and the sealing pressure isolation function cannot be achieved; the oil trapping phenomenon occurs in the gear pump, resulting in insufficient hydraulic oil output.

(2) The reasons for the gear pump not to absorb oil or insufficient oil include the following: insufficient hydraulic oil volume or blockage of hydraulic oil pipe; excessive hydraulic oil viscosity causes filter blockage; oil suction pipe enters the air, etc. For the problem that the gear pump does not absorb oil, the problem of insufficient hydraulic oil should be eliminated first, and the oil quality of the hydraulic oil should be checked. Remove air and blockages in the oil circuit.

(3) The failure of gear pump burning is caused by the high temperature of the gear pump, which may be caused by the lack of hydraulic oil causing the gear pump to idle due to excessive temperature and burnout; or the abnormal working state of the distributor, resulting in the safety valve or return. Position failure, causing the gear pump to be overloaded for a long time. In addition, if the gear pump is assembled too tightly, the running resistance will be too large, which will easily cause the problem of excessive temperature. There are many factors for the failure of the gear pump. According to some statistics, the probability of the faulty parts of the gear pump is the problem.

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