Discussion
If the dynamic weight on the front axle is lesser than 20% of the total weight of tractor, the longitudinal instability of tractor can be avoided by __________.
Answer: B
The instability is avoided by adding weight on the front axle.
When a tractor pulls a heavy drawbar load, weight transfers from the front axle to the rear. If the dynamic load on the front axle falls below about 20% of the tractor's weight, the front end becomes light: steering control is lost, and in the extreme the tractor rears up and overturns backwards. Ballast (front weights) added to the front axle restores enough load there to keep the tractor stable and steerable.
Adding weight on the rear axle, or removing it from the front, moves more load to the rear and makes the instability worse. Reducing rear weight would lose traction without directly restoring the front-axle load.
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