Operation 4
Emergency operation
WARNING
Risk of injury
The attachment and load must have enough space
from the racking on all sides. Otherwise, safe
lowering of the cab cannot be guaranteed.
If the operator falls unconscious, make sure that all
parts of the body are completely inside the driver’s
cab and that there is no risk of injury for the operator
during the lowering procedure.
The operator of the emergency lowering valve must
be certain that the moving components of the lift
mast are immediately set in motion on opening the
valve. Special attention must be given to the cab,
the chains and the inner masts of the lift mast.
All of the load chains in the lift mast must remain taut
throughout the whole of the lowering procedure. If
the components of the lift mast are not immediately
set in motion after opening the emergency lowering
valve, close the valve immediately.
If the view that the operator of the emergency
lowering valve has of the lift mast is obstructed,
a third person with full view of the lift mast must be
involved. Clearly, this third person must be able
to communicate readily with the operator of the
lowering valve and the truck operator.
If a movement like the one described cannot be
detected immediately or if one of the chains has
slackened, a mechanical jam at the lift mast is
suspected. The emergency lowering procedure
must then be stopped immediately by closing the
emergency lowering valve.
The operator must then be retrieved some other
way. A second turret truck could be used if suitable,
or a lifting working platform.
Restarting after emergency lowering
WARNING
Risk of accident
If the emergency lowering function was required
because of a technical defect, the truck may only be
put back into operation if the cause of the error has
been rectified by a specialist.
If, as described above, a mechanical jam of the
lift mast is suspected, the abseil system must not
be used. The resulting vibrations could cause the
mechanical jam to be released, which could create
a further hazard should the cab subside.
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13 804 2501 EN - 01/2016 75
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