Crown Block

The retaining bar can prevent drill line from jumping out of and jumping off sheave grooves. Sheave grooves are medium-frequency induction hardened, prolonging the sheave service life. Sheave bearings are lubricated individually with the grease cup at the shaft end. Sheaves and bearings of the crown block may be interchanged with those of the traveling block. The crown clocks conform to API Spec 8A /4F.