Tractive performance for 4-WD tractors under different tire-ballast combinations [electronic resource].

Includes references.

The tractive perfonnance and fuel economy of a 4-WD tractor was investigated under different tire-ballast combinations. Single tires and dual tires. with and without ballast, were used. The tests were conducted in three soil conditions at various drawbar loads for two transmission gear settings. Performance curves are presented and the results indicated that: the all singles all ballasted outperformed the all dual nonballasted and the all singles nonballasted arrangements in soft soil. Single wheel combinations had better tractive performance than the two dual wheel combinations in medium (tilled) Soil except at high drawbar loads. In stubble (firm) soil, no clear advantage occurred for any wheel or ballast combination. No Significant differences in specific fuel consumption occurred for the various wheel and ballast combinations. For each combination and for all soils, fifth gear provided better specific fuel consumption than fourth gear.

Summary in Arabic.

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