Manitowoc Grove GMK 4100L-1, Operating Manual

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Rigging work
12.8 Outrigger operation
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GMK4100L-1
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1.
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12.8.8
Extending/retracting supporting cylinders
H
Do not extend the supporting cylinders to their absolute limit. The support-
ing cylinders must have a remaining stroke of at least 25 mm (1 in) in order
to carry out alignment corrections.
There are various operating elements for moving the outrigger beams
– On the
Outriggers
control units;
à
p. 12 - 55,
– In the crane cab;
à
p. 12 - 56.
G
Danger of overturning due to insufficient load bearing capacity of the
ground
Enlarge the load-bearing area if the ground cannot withstand the resulting
outrigger pressure.
This prevents the ground under the outrigger pad giving way and causing
the truck crane to tilt and overturn.
G
Risk of accidents if the supporting cylinders are out of sight
No one is allowed to be in the area of the supporting cylinders.
Observe the moving supporting cylinders or have them observed by a
banksman who is in visual contact with you.
S
Risk of damage to the supporting cylinders
Move the outriggers as uniformly as possible on all four points under
the boom. This prevents the supporting cylinders being damaged due to
one-sided pressure.
S
Risk of damage to the tyres
Before retracting the supporting cylinders, remove any sharp-edged and
pointed materials from below the tyres.
This prevents the tyres being punctured or damaged when the truck crane
is lowered.