How do manual locking hubs work?

Manual locking hubs are devices installed on the front wheels of four-wheel drive vehicles that allow the driver to engage or disengage the front axle from the wheel. When the hubs are in the "lock" position, they connect the axle to the wheels, enabling power to be distributed to the front tires for traction on rough terrain. In the "free" position, the hubs disconnect the axle, reducing drag on the drivetrain and improving fuel efficiency when four-wheel drive is not needed. This manual engagement gives the driver control over when to utilize four-wheel drive capabilities.