A telehandler's load chart shows that its maximum lift capacity is 4,000 kg with the boom fully retracted and at a specific angle. When the boom is extended to its maximum reach of 12 meters, the capacity significantly decreases to 500 kg. What is the fundamental reason for this reduction in capacity with increased boom extension?

Question: A telehandler's load chart shows that its maximum lift capacity is 4,000 kg with the boom fully retracted and at a specific angle. When the boom is extended to its maximum reach of 12 meters, the capacity significantly decreases to 500 kg. What is the fundamental reason for this reduction in capacity with increased boom extension?

Answer options: ✅ The shift in the telehandler's centre of gravity further forward, increasing the overturning moment.

• Increased hydraulic pressure required to extend the boom, reducing lifting power.
• The structural weakening of the boom material when fully extended.
• Reduced visibility for the operator at greater reaches, necessitating a lower capacity.

Correct answer: The shift in the telehandler's centre of gravity further forward, increasing the overturning moment.

Explanation: As the boom extends, the load moves further away from the telehandler's front axle, which shifts the combined centre of gravity of the telehandler and load forward. This increases the overturning moment, making the machine less stable and consequently reducing its rated lifting capacity to prevent tip-over, as per CSA B354.7 and B354.6.