Subtopic: Power transmission systems – gear trains, differential, final drives and power take-off
Question Statement:
The primary function of the differential lock mechanism in an agricultural tractor is to:
Options:
(A) Increase the turning radius of the tractor during tight headland turns
(B) Equalize the rotational speeds of both drive wheels when one wheel loses traction and spins
(C) Disengage the PTO shaft under overload
(D) Allow the outer wheel to rotate faster than the inner wheel during cornering
Answer Key:
B
Step-by-Step Solution & Explanation
When one driving wheel encounters slippery mud, an open differential transfers no torque to the other wheel (it spins freely). Engaging the differential lock couples both axle shafts together so both drive wheels rotate at identical speeds with full traction.