At present, there are many scattered and scattered farm machinery maintenance outlets, mainly family workshops, with small scale and low level, and the legitimate rights and interests of the operators are often violated. To this end, several major quality acceptance criteria for tractor repairs are proposed: The engine is easy to start, the operation is stable, there is no knocking, olein and smoke phenomenon; the engine must not exceed the rated speed, the governor works flexible and reliable, when the throttle is at minimum When in position, it can run idly, and when the pullout lever is pulled, it can immediately extinguish the fire; the readings of various meters must be within the specified range; the power after the engine repair should meet the requirements of the standard; the start-up acceleration performance should be significantly better than before the repair, the empty car and the load speed Significantly improved; Steering mechanism is flexible and reliable; The clutch is reliable, the clutch is fully engaged, and the pedals are completely separated; the pedals have a moderate free stroke; the gear shift is easy, no gears are blocked, no gears are lost, and there are no abnormal sounds at different rotation speeds; the brakes are flexible and reliable. The road can ensure safe parking; the front wheel toe and kingpin inwards are in compliance with the standard, and do not swing or loosen when driving; the tire pressure is normal; the hydraulic mechanism can reach the highest position quickly and smoothly, and can stay in any position in the middle; The equipment is well-integrated, the circuit wiring is correct, the joints are firm; screws, washers, pins Nails and other parts are complete, fixed and reliable, no oil leakage, leakage, leakage phenomenon.