40
9.4.4 Wormgear assembly control (Pict. 21)
It is important to check that the worm gear reducer has a correct axial backlash. This can be made, with the
crane at standstill, the boom in horizontal position. Pushing the boom aside on the left and on the right by
hand, you can notice if the axial backlash between the wormshaft (
6
) and the wormgear (
8
) is too great. In
this case it has to be reduced, tighten the nut (
7
) accordingly. Grease the gear with the suggested product
and replace the grease spreader (
9
), if worn out.
9.4.5 Greasing the hydraulic boom sections (Pict. 22)
1 - Completely extend the telescopic boom
2 - Grease the lower part of the extensions by a brush
3 - Grease the upper part of 1st. extension by the two grease nipples (pos. A)
4 - Move the grease nipples to pos. B and go on greasing the upper part of 2nd. extension
5 - Take the grease nipples off and move them back to pos. A
6 - Carry out 2 or 3 boom re-entry and extension idling operations in order to allow the distribution of
the grease
9.4.6 Wear pads check and replacement
Wear pads need to be replaced when their thickness drops under 5.5 mm (0.22 inch.)
ATTENTION
Failure to replace the wear pads when
they have reached the above stated
wear limit, can prejudice to the good
and safe operation of the crane.
7
6
8
9
Pict. 22
Pict. 21
Pos. “A”
Pos. “B”
