RIGGING / DE-RIGGING
BG 25 / 2011 /
2254_BG25_en_0000498763_V01
7 - 25
7.8
DISASSEMBLING THE MAST
7.8.1
Removing the Retaining Clamps
Using a hammer, knock the locking ring
(4) off the retaining clamp.
Remove the O-Ring (2) from the groove
(3) in the clamp.
Remove the clamp halves (1) from the
backstay cylinder.
Repeat the procedure on the other
backstay cylinder.
4
3
1
3
2
1
B0000671.wmf
7.8.2
Lowering the Mast
Adjust the uppercarriage in line with the undercarriage, with the mast located on the
same side as the crawler drive wheels.
CAUTION
Risk of colliding the mast with the crawlers!
The uppercarriage must be in the correct position.
Unspool main and auxiliary rope, and put the ropes on the ground beside the
machine.
Completely extend the boom cylinders.
Select the "De-rigging" mode.
Select backstay cylinder operation and uniformly and synchronously push both con-
trol levers forward to extend the backstay cylinders.
The mast lowers.
CAUTION
Rig tipping hazard!
Take care not to let the mast drift aside during the lowering. The back-
stay cylinders must be extended uniformly and without interruptions.