OPERATION ON SLOPE
The operation on slope of cranes that travel with a freely suspended loads should be
avoided if at all possible (refer to AS 2550.5). Mobile Cranes are primarily designed to
operate on firm, flat, level ground - within a 1% gradient (refer to AS 1418.5 (2002)).
Any deviation from this requires that the Rated Capacity shall be reduced (derated)
accordingly.
If it is necessary to operate on slope the
precautions listed below must be taken.
REMEMBER
that surface depressions and
potholes will create the same effect as a
sloping surface.
Ensure the ground condition is
FIRM
enough to support the axle loads.
Ensure the tyres are inflated to the correct
operating pressures.
Keep the load on the
UPHILL
side of the
crane where possible.
REMEMBER
the
working Load Radius will increase if the
load is suspended in the downhill position.
NOTE:
The MAC 25 crane must at no time be
operated on a slope greater than
5
(8.75% gradient).
In order to determine the slide slope of a
particular site the crane’s LMI can be used to
give an approximation. Before commencing
the lift, drive the un-laden crane slowly across
the sloping surface and note the maximum
slope displayed. Take the reading when the
crane’s articulation is zero (straight ahead)
and with the boom (fully retracted) in its
lowest position practical.
The MAC 25 is fitted with an LMI that
calculates the rated capacity for the crane
when the crane tilts in any direction.
SLOPE RATED CAPACITY
The degree of tilt of the front body results from a number of factors. Articulation of the
crane induces tilt as does working on a slope. In combination the body tilt is
increased when the load is on the DOWNHILL side of the crane (when the crane
articulation direction is down a side slope).
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