1. The service life of large-scale rail tractor tractors exceeds 12 years (including cumulative 15,000 hours). After inspection, adjustment or replacement of wearing parts, the technical conditions are still 4.1 or 4.2; 2. Large and medium-sized wheels The service life of the tractor is more than 15 years (or 18,000 hours of accumulated operation). The technical status after inspection or adjustment or replacement of wearing parts is still 4.1 or 4.2; 3. The useful life of small tractors exceeds 10 years (or 12,000 cumulative operations) Hours), after inspection or adjustment or replacement of wearing parts, the technical status is still 4.1 or 4.3; 4, due to various causes of serious damage, can not be repaired: 4.1: In the calibration conditions, the rate of increase in fuel consumption The amplitude is greater than the factory calibration value of 20%; Article 4.2: Large and medium tractor engine power or power output shaft power reduction value is greater than the factory calibration value of 15%; 4.3 Article: Small tractor engine effective power reduction value is greater than the factory calibration value of 15%; 5. It is estimated that the overhaul cost is more than 50% of the price of the new vehicle of the same type; 6. The service period is not reached but the technical condition is poor and there is no source of accessories; Dispelled.
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