In a tractor three-point linkage system, 'Draft Control' automatically adjusts the working depth of a soil-engaging implement based on:
Options:
(A) Variations in horizontal soil resistance (draft force) sensed through the top link or lower links
(B) The angular position of the hydraulic lift arms relative to the tractor chassis
(C) The tractor forward ground speed
(D) The engine crankshaft rotational speed
Answer Key:
A
Step-by-Step Solution & Explanation
Draft control senses changes in draft force through deflection of a spring or load sensor on the top link/lower links, lifting the implement slightly in hard spots to prevent tractor stall and maintain constant engine load.