Abstract: A device for moving a rock lodged in a rock crusher which includes a support on which is mounted a first turntable. Connected to and extending from the first turntable is a second turntable the rotational axis of which is offset from the rotational axis of the first turntable. Also provided is a boom pivotally connected to the second turntable. The boom includes an extendable boom member slidably mounted in the main boom portion and on the end thereof a pivotal hook together with means for operating the turntables, boom and hook individually or in combination to place the hook adjacent a rock in a crusher and then move the rock to a position whereby the crusher can accept and crush it.