Adjustable combined pulleys

RAK adjustable combined pulleys by SLB are primarily intended for high lift trucks and for other hoisting and handling machinery.

RAK pulleys are capable of simultaneously accomodating both radial and thrust forces acting on the arrangement as a result of both the external load and imperfections in the machine assembly. To adjust the radial clearance arising from the machine assembly, or its operation, a screw with an embossed hexagonal situated in the pulley body is used, secured in position by a lock nut. The inside of the radial pulley is sealed off by a non-contact metal labyrinth sealing, highly resistant to damage. The bearings are supplied prelubricated with grease. To facilitate additional lubrication the bearing body is fitted with a lubrication distribution system. The bearings in Fig. 1 have only the radial pulley re-lubricatable, while the bearings in Fig. 2 have both the radial and thrust pulley additionally re-lubricatable. Outer rings of the pulley (radial and thrust) and the shaft of thrust pulley are made of carburizing steel, the other load accomodating parts are manufactured from through hardening steel for bearings. The pulley body is made of welding structural steel.