Field operation: The factors influencing the work load of tractor
vary according to characteristics of soil, operating conditions,
and the types of implement, so it is impossible to consider all
these factors in once 7
. Plow tillage is different from rotary tillage
in that the former uses traction force while the latter uses PTO.
Also, the work speed influences the load of driving axle 14.
Therefore, this study considered the gear ranges as a factor
influencing the work load of tractor.