Nandhi Secondary Crushers are of double-toggle oil lubricated type, and of very robust constructionwith Small mouth openings to allow free flow of rock to be crushed into soiling. In this type of crushers, the moving jaw is driven by the eccentric shaft that moves the front and rear toggles up and down. Each shaft revolution causes the moving jaw to close at the downstroke and openup during the upstroke. Body and jaw stock are stress relived usingmodern resonant vibratory stress relief mechanism. The Pitman, toggle assembly, main bearingand shaft are all in constant oil bath and lubricated through a geared pump coupled to the shaft.This positive lubrication sysytem is coupled with the double toggle mechanism ensures life ofbearings for years together. Since crushing is done by direct compression, the work hardening manganese steel jaw plates have a much longer life than other models of crusher.