Subtopic: Three point hitches – free link and restrained link operations
Question Statement:
In a tractor three-point linkage operating in 'restrained-link' mode (such as a mounted mouldboard plough supported by hydraulic draft control):
Options:
(A) Implement vertical soil forces and weight are dynamically resisted by the tractor hydraulic lift cylinder, enabling continuous weight transfer to the tractor drive wheels
(B) The implement floats entirely on its own wheels without hydraulic support
(C) The lower links are disconnected from the tractor rockshaft
(D) Zero weight transfer occurs between implement and tractor
Answer Key:
A
Step-by-Step Solution & Explanation
In restrained-link operation, the tractor hydraulic system continuously supports vertical forces acting on the implement. This force balance allows dynamic transfer of implement mass and downward soil forces to the tractor rear axle, increasing traction and cutting wheel slip.