Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
In the hydraulic three-point hitch system of an agricultural tractor, the 'Draft Control' mode is designed to automatically adjust implement depth to:
Options:
(A) Keep forward speed constant regardless of soil resistance
(B) Maintain a constant pulling draft force, raising the implement in hard soil and lowering it in light soil
(C) Keep the bottom link parallel to the ground surface
(D) Prevent tractor engine oil temperature from rising
Answer Key:
B
Step-by-Step Solution & Explanation
Draft control senses draft load via the top link or lower link sensing springs. When soil draft exceeds the set value, the hydraulic valve automatically raises the plow slightly to relieve draft, preventing engine stalling or excessive wheel slip.