A heavy-duty wheel loader experiences severe shriek and binding when attempting to turn sharply on hard ground. The machine operates fine in a straight line. What component in the final drive system is most likely malfunctioning?

Question: A heavy-duty wheel loader experiences severe shriek and binding when attempting to turn sharply on hard ground. The machine operates fine in a straight line. What component in the final drive system is most likely malfunctioning?

Answer options: ✅ The differential lock is engaged or seizing.

• Worn planetary gears in the wheel hub.
• Low oil level in the final drive.
• A bent axle housing.

Correct answer: The differential lock is engaged or seizing.

Explanation: Severe shriek and binding during sharp turns on hard ground, while operating normally in a straight line, are classic symptoms of a differential lock being engaged or seizing. This prevents the wheels from turning at different speeds, creating stress and noise. Worn planetary gears would likely cause noise or play but not necessarily binding during turns. Low oil would cause general wear and heat, and a bent axle housing might cause alignment issues but not this specific symptom pattern.