Subtopic: Hitch systems and hitching of tillage implements
Question Statement:
Which of the following statements regarding tractor hitch systems and draft control are CORRECT?
Options:
(A) Draft sensing can be achieved through either top link sensing or lower link sensing
(B) In draft control mode, an increase in soil resistance causes the hydraulic system to raise the implement slightly to reduce draft
(C) Position control mode maintains a constant implement depth regardless of changes in soil resistance
(D) In restrained link operation, the virtual hitch point must always remain ahead of the tractor front axle
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
Options A, B, and C are correct:
- Draft sensing mechanisms commonly sense deflection either at the top link (typical for light-to-medium implements) or at the lower draft links (common for heavy implements).
- Automatic draft control maintains uniform engine load by raising the implement when high draft is sensed and lowering it when draft drops.
- Position control locks the three-point hitch at a fixed geometric position relative to the tractor chassis.
- Option D is false: in restrained-link operation, the depth is mechanically governed by gauge wheels or hydraulic cylinders and the virtual hitch point is not constrained to be ahead of the front axle.