6 - ORDINARY MAINTENANCE
6 - 30
- connect an overhead crane "C" to the head of the telescopic boom (as shown in the photo) in such a way as to lift the
second boom bringing it into contact with the first boom. It is also possible to rest the carriage on the ground on a perfectly
flat plate, small-sized and positioned centrally with respect to the boom, and then to lower the telescopic boom in such a
way as to raise the second boom bringing it into contact with the first. In both cases never force the manoeuvre bringing
about contact between the booms so as not to damage the structure of the telescopic boom.
- lay a 1 metre gauge rod "X" on the carriage in a symmetrical manner
- place a spirit level "Y" in the middle of the rod "X"
- loosen all the lower dowels and then tighten them starting with the ones in the middle of each slide and continuing in a criss-
cross manner. Loosen by 1 turn all the lower dowels and tighten the counter nuts.
- loosen all the side dowels (on both sides of the boom) and then tighten proceeding in a criss-cross manner. Loosen by 1/2
turn all the side dowels and tighten the counter nuts.
- remove the bridge crane or, in the event a ground blockage was used, lift the machine's telescopic boom.
- on the spirit level "Y" check that the carriage is level.
- if the carriage is not level, you need to adjust the lower runner that you intend to lower.
To do this you have to unscrew the two M12 screws of the lower runners and then loosen the dowels of the upper runner on
the same side of the boom that has to be lowered.
- unscrew the outer lower dowels “H” of the slide that should lower and use the middle dowel "G" until the spirit level shows
that the carriage is perfectly level.
- tighten all the dowels in question working in a criss-cross manner, and then loosen the side dowels by half a turn and the
upper dowels by 1 turn
- tighten all the counter nuts
- fully extend the telescopic boom, making sure that the inclination percentage of the boom never exceeds the value of
±0.3%.
After adjusting the running pads of the boom there might be non-symmetrical play between the runners themselves and the top
of the boom, as shown in the photo.
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