Jaw crushers are often used as primary crushers and are perhaps the most popular crusher worldwide. These compressive crushers are suitable for most any type of material.

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In this type of crusher, reduction takes place between a stationary jaw plate and a moving jaw plate. The moving jaw plate is mounted on the pitman, which is given a reciprocating motion. Crushing takes place when the pitman moves toward the stationary jaw, compressing the material.

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There are two main types of jaw crushers - single toggle and double toggle.

McLanahan produces single toggle jaw crushers, which feature a pitman mounted on an eccentric shaft at the top. At the bottom of the assembly, the pitman is held in position by a toggle plate. The combination of eccentric motion at the top and rocking motion at the bottom provides a positive downward thrust throughout the crushing chamber.

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Single toggle jaw crushers have better feed acceptance capability than the corresponding double toggle crushers. Jaw crushers are reliable, robust machines, offering a 6:1 reduction ratio in most applications, and will accommodate hard, abrasive materials.

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