نوع مقاله : مقاله پژوهشی
گروه مهندسی کشاورزی، دانشگاه فنی و حرفه ای، تهران، ایران
عنوان مقاله [English]
In this applied research, using the breakdown maintenance of the machine engine, a procedure maintenance and preventive maintenance on the fuel system, which was the main cause of the engine breakdown of these machines, was investigated. A case study was conducted on the engine of 80 Bumag BW211D rollers produced by Bumag factory, equipped with Common Rail fueling system, which were working in road construction projects in Fars, Bushehr, Hormozgan, Kohkiluyeh and Boyr Ahmad provinces. First, the data on the amount of damage and imposed costs were collected, and by designing eight service models on the fueling system, which consisted of performing and not performing three periodic services of 250, 500, and 1000 hours on the engine and the fueling system, the life of the injectors of these devices were analyzed completely randomly through the F test with an error level of 1% and the significant effect of the services on the lifetime of the injector needles was observed. Each other and on the life of the injector needles was significant. The significance of the effect of triple services in reducing fuel system costs and increasing the life of injector needles based on engine operating hours covered a low range of 700 hours in case of no service to a high range of 10,000 hours in case of full service. By examining the working hours compared to the increase in the cost-to-income ratio of the machine in case of no service, the inverse relationship between cost and income was drawn with R2=1. At the end, the suggested solutions to increase the life of the injector needles such as using water separator filters and tank drainage from water and sediments were suggested.