Subtopic: Three point hitches – free link and restrained link operations
Question Statement:
In a tractor 3-point hitch hydraulic system operating in 'Draft Control' mode, the hydraulic lift cylinders automatically adjust implement depth in response to:
Options:
(A) Tractor wheel speed variations
(B) Sensing force (compression or tension) on the top link or lower draft links
(C) The angle of inclination of the front wheels
(D) Engine oil pressure fluctuation
Answer Key:
B
Step-by-Step Solution & Explanation
Draft control senses changes in soil resistance through load-sensing springs/transducers on the top link or lower draft links. When soil gets harder and draft exceeds the set threshold, the hydraulic system slightly raises the implement to reduce load, and vice versa.