JAW CRUSHER Operating Manual that the cover has been closed before the jaw crusher could be started. ⇒ If the cover is left open, the jaw crusher can not be put in operation. ⇒ Only after the cover is on its place, the jaw crusher can be put into operation. ⇒ After lifting off the cover the jaw crusher stops. 2.4 Hazard points • Danger of crushing at the funnel lid!