Effer uses two rotation systems to ensure maximum customization of its cranes: the rack system and the double race bearing system.
Effer Rack system ensures a crane rotation angle exceeding 360°, that on average, is one of the widest in its category.
On the other hand, the double race bearing system allows the crane to rotate continuously and without limits.
DOUBLE RACE BEARING SYSTEM
Turning endlessly. Effer double race bearing system allows the crane to rotate continuously. For the transport of oil and electrical signal from the base to the moveable part, Effer makes use of an innovative and reliable rotary distribution system which does not set limits to the crane’s maneuvers in any way.
ROTATION SPEED AND POWER CONTROL SYSTEM
Rotation under control. Effer uses gear motors with various reduction stages. The operator can thereby adjust the crane rotation speed, and check the movement of the load on the hook in an extremely safe and precise manner.
Very fast, very slow. The various reduction stages of the engine RpM result in maximum operating power even at minimum rotation speed.
Strong in every sense. The Effer system ensures constant rotation power in any boom working position in relation to the truck.
EXTERNAL GEAR MOTOR
Push with all your might. The external gear motor does not have dimension problems like the internal gear motor. For a medium sized crane, this solution allows you to use high power motors without any space requirement.
Backlash rules. The external gear motor can adjust the position in relation to the bearing to reduce the bearing/pinion backlash by means of ordinary tools.
Protection from the exterior. Effer cranes’ rotation bearing is equipped with a leak-tight seal between the rotary rings, to prevent water and dust entering in the tracks.
BEARING FA STENING
Total attachment. All Effer rotation bearings are fastened by means of high resistance screws tightened with a dynamometric wrench.
Slipping softly. Effer rotation bearing uses two revolutions of ball bearings to reduce to a minimum the rotation friction
MECHANICAL SOLUTIONS TO REDUCE FRICTION
Position of the guides. The lower and upper guides of the crane column are at the widest possible vertical distance to ensure their maximum stability and minimum power loss.
Position of the rack. The position of the rack between the guides decreases the column bending and therefore the friction in relation to the guides.
Opposing thrusts. The rack is located on the opposite side of the crane boom. In this way it opposes the column bending, contributes to the reduction of backlash and reduces the power loss due to the friction between the column and guides.
GEARS OF REDUCED DIMENSIONS
More than 360°. Effer rack rotation system has gears of reduced dimensions, given the use of special materials. This allows you to obtain rotation angles wider than average, of more than 360°.
BACKLASH RECOVERY ADJUSTERS
No more backlash. Effer rack rotation system foresees the use of an adjuster which can reduce the mechanical backlash between column and rack over time.
GREASING IN ONE POINT
All together. Effer designed the rack rotation system so that all the base greasing points are close to make maintenance operations easier.
VARIABILITY OF THE DEAD CENTER
Versatility. The rack system can be adjusted to vary the position of the dead center in the event of a second installation on a new truck.
The assembly of the mechanical, hydraulic and electronic systems of Effer cranes monitor the rotation movement very precisely.
Effer rotation systems have a low friction index and decrease the wear of components over time. The backlash adjusters allow rotation systems to be kept efficient over time. Variability of the dead center in the rack system allows the crane to be re-installed on a different truck with different space requirements. The seals applied to the rotation bearing protect it from water and dust, extending its durability over time.
Effer solutions for the two rotation systems ensure a precise monitoring of movements over the entire working area of the crane for maximum safety of the operator and of the load.
Effer friction control systems allows you to take advantage of the overall power of the hydraulic system for crane rotation with performances above average.