67
fi g. 4.24
fi g. 4.25
fi g. 4.26
fi g. 4.27
fi g. 4.28
fi g. 4.29
4 - P
OWER
P
ACK
AND
O
PERATING
C
OMPONENTS
Lowering the platform
Power Pack and Operating Components
1-
Before lowering the platform, make sure
that the motorized unit and plank
outriggers clear the building, balconies,
etc., that the mast tie door is open and
that planking has been removed from in
front of each mast when passing a tie
level.
2-
Unlock the lowering cam on both the
cylinder hook and the secondary hook on
both masts (fi g. 4.25).
3-
Make sure that the engine is running at
full throttle. Visually make sure that the
cylinder hook and the secondary hook
are properly engaged (fig. 4.26 and
fi g. 4.27) and on the same mast rung
(fi g. 4.32, p. 68) on both masts. Failure
to engage the hooks correctly can cause
the platform to drop.
4-
Lower the control levers to retract the
cylinders completely so the lowering cam
on each secondary hook can swing
toward the mast. The engine will slow
down when the cylinders are fully
retracted.
5-
Raise the control levers to extend the
cylinders completely. The engine will slow
down when the cylinders are fully
extended. The platform will lower by 10"
or 20" (25,4 cm or 50,8 cm), or a height
equal to one or two mast rungs (fi g. 4.29).
Cam in unlocked
lowering position
Incorrect
Correct
WARNING
Visually make sure the cylinder hook and the secondary hook are properly
engaged on a mast rung on each mast before raising or lowering platform
(fi g. 4.26 and fi g. 4.27). Failure to engage hooks correctly can cause the
platform to drop, leading to equipment damage, injury, even death.
Mast tie door
2 rungs
