A Single Toggle Jaw Crusher uses only one toggle plate in its mechanism. Two bearings are fit in the swing jaw of this crusher and the other two bearings support the eccentric ahaft, which is driven by the drive flywheel. An extra (non-drive) flywheel is provided to lessen the power requirement of the prime mover motor/engine). Being light in size and relatively easy to operate and maintain, the Single Toggle Jaw Crusher is a popular machine for use in hilly terrain and for mobile crushing plants.