University of Khartoum

Tractors Repair And MaintenanceCosts Estimation In New Halfa Area

Tractors Repair And MaintenanceCosts Estimation In New Halfa Area

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Title: Tractors Repair And MaintenanceCosts Estimation In New Halfa Area
Author: Nasir, Awad Omer Mohammed
Abstract: A field survey was carried out in New Halfa area to collect data about tractors repair and maintenance costs, annual hours of use and fuel consumption of three tractors makes, Massey Ferguson (M), Belarus (B) and Ford (F). The collected data was used to develop relationships between repair and maintenance costs, annual hours of use, age of the tractors and fuel consumption. Mathematical models were developed to predict the accumulated repair and maintenance costs as % of initial purchase price (y) related to accumulated hours of use (x) for the three tractors makes. The average prediction model of the three selected tractors makes, was found as follows: y = ( 2.0 x1.59).10-5 The derived models indicated that the accumulated repair and maintenance costs as percentage of initial purchase price increased as the accumulated hours of use increased for the three selected tractors makes. Mathematical models of accumulated repair and maintenance costs (P) in relation to tractor age in years (S) were also developed for the three selected tractors makes as follows: 1- Make (M) 65-80 hp (R2 = .99) P = 336.9 S1.047 2- Make (B) 78-89 hp (R2 = .99) P = 423.3 S0.9978 3- Make (F) 79 hp (R2 = .99) P = 9.9262 S2.234 The results indicated that the accumulated repair and maintenance costs ($) of the three selected tractors makes increase with age. Mathematical models of accumulated repair rate/1000 hr (A) in relation to age in years (G) were also developed and found as follows: 1- Make (M) : A = 2.0012 G0.9031 2- Make (B) : A = 1.8296 G0.9518 3- Make (F) : A = 0.0696 G2.0337 The results showed that the accumulated repair rate/1000 hr increased with tractor age (yrs) for the three selected tractors make. Fuel consumption rate in (gal/hr) was found to be affected by annual maintenance costs, annual hours of use and tractor age for the three selected tractors makes.
URI: http://khartoumspace.uofk.edu/handle/123456789/12037
Date: 2015-06-14


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