JIB CRANES WITH AN ARTICULATED ARM MANUALLY ROTATED

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4.3.5 Assembly of the arms –For CBB column-mounted cranes and MBB wall-mounted cranes
For the assembly of the arms proceed as follows:
1. Sling the arm, using strips made of textile fibre arranged in a “loop”, corresponding to the handling
points shown on the labelling and lift with suitable means ( overhead travelling crane, travelling crane,
etc.). Keep the girder horizontal to the round and constantly check the stability of the slinging which
must not move from the handling point. Avoid oscillations and swinging and, if necessary, to maintain
the equilibrium use a rope tied to the ends of the arm.
2. Line the arm up with the plates (of the bracket or column) and position in the upper part of the tube
the bearing 1 the upper bearing pressure plate 8 and the clutch plate 9 with the clutch disc 12 (glued
on the disc) against the tube, making sure at the same time that the bearing and the lower bearing
support 14 fit into the lower part (fig.38 ).
Fig.38
3. Insert the tube between the plates 4 until the rotation axis of the tube coincides with that of of the
plates and insert the rotation pivots 5, after lubricating them with grease ( fig.39 ).
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