Many truck mounted cranes prohibit lifting in which quadrant unless an additional stabilizer is present?

• A. Over the front
• B. Over the rear
• C. Over the left
• D. Over the right

Answer: (A)

Stability comes from a wide base and the ability to resist tipping moments as the boom and load create forces. When you lift toward the front of a truck-mounted crane, the load pulls the vehicle forward and shifts the center of gravity ahead of the rear supports. Without a front stabilizer to provide a counteracting moment, the truck can tip forward. That’s why lifting in the front quadrant is prohibited unless an additional stabilizer is present to extend the base and counteract that tipping tendency. The rear, left, or right quadrants are managed with the stabilizers the crane already uses, so they’re not restricted in the same way when proper stabilizers are deployed.