68
fi g. 4.30
fi g. 4.31
fi g. 4.32
4 - P
OWER
P
ACK
AND
O
PERATING
C
OMPONENTS
Lowering the platform (cont’d)
Power Pack and Operating Components
6-
Lower the control levers to retract the
cylinders enough so the secondary hook
is above the mast rung on each mast (but
not its lowering cam).
7-
Raise the control levers so the secondary
hooks lower enough to engage onto the
mast
rungs.
Before lowering the platform, check visually
to make sure that the secondary hook is
properly engaged on the mast rung on
both
masts.
8-
Raise the control levers again to extend
each cylinder completely and force its
lowering cam to swing toward the mast.
9-
Lower the control levers to fully retract
the cylinders completely. The engine
will slow down when the cylinders are
fully
retracted.
10-
Raise the control levers to extend each
cylinder enough until its hook is above
the mast rung (but not its lowering cam).
11-
Lower the control levers so the cylinder
hooks lower enough to engage onto the
mast
rungs.
Both the cylinder and secondary hooks
will be side by side on the same mast
rung on each mast.
12-
Repeat steps 4 through 11 to continue lowering the platform.
13
- Monitor the last 10' (3 m) of lowering to base level to ensure the proper seating of the
access
walkway.
14-
Once the platform has been brought down to base level or to the desired height, make
sure that both hooks are properly engaged on the same mast rung on each mast.
fi g. 4.3
fi g
WARNING
The use of fall protection equipment is
mandatory
to handle operations when
passing tie levels. Properly tied to the unit, slide planks away from in front of
the masts and open the mast tie doors. Close the mast tie doors once the tie
levels are passed.
WARNING
In a bearing bridge confi guration, it is mandatory to coordinate the raising and
lowering operations on each motorized unit linked by the bearing bridge to
ensure that any slope of the bridge structure does not exceed 2
degrees or 1"
/ 24" (35 cm / 61 cm).
