Subtopic: Hitch systems and hitching of tillage implements
Question Statement:
In a standard tractor three-point linkage system operating under 'free-link' floating conditions with a semi-mounted or mounted implement, the virtual hitch point in the vertical longitudinal plane is located at the intersection of:
Options:
(A) The tractor rear axle centerline and the drawbar pin
(B) The centerlines of the two lower draft links
(C) The centerline of the top link and the centerline of the lower links
(D) The implement center of resistance and the tractor center of gravity
Answer Key:
C
Step-by-Step Solution & Explanation
```
Virtual Hitch Point (V) Geometry:
Top Link
O========================O (Implement Mast)
\ /
\ /
\ /
V (Virtual Point)/
/ \
/ \
O========================O (Lower Hitch Pins)
Lower Links
```
In the vertical longitudinal plane:
- The top link converges with the lower links towards the front of the tractor.
- The virtual hitch point ($V$) is the instantaneous center of rotation of the implement relative to the tractor, formed by the intersection of the line extending through the top link and the line extending through the lower links.