RD 27 Operation
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4.20 Machine Stability
Surface
conditions
Pay attention to changing surface conditions while operating the machine. Adjust
speed and travel direction as necessary to maintain safe operation.
Machine stability and traction may be severely reduced when operating on
uneven or rough terrain, rocky soils, or wet or loosely packed surface material.
The machine may suddenly tip, sink, or fall when moved onto surfaces that have
been newly filled with earth.
Steering angle
An articulated roller is more likely to tip when moving off an elevated surface if the
machine is turned away from the edge.
As shown in the illustration on the right, always turn the machine toward the
edge when moving off an elevated surface.
Travel speed
A fast moving machine is more likely to tip or fall over while making turns or
changing direction.
Reduce travel speed before turning the machine.
Drum
overhang
The machine can tip suddenly if more than half of the drum width extends beyond
the edge of the elevated surface.
Reduce travel speed and watch the drum position carefully when operating
along the edge of an elevated surface.
Keep as much of the drum on the elevated surface as possible.
Vibrating on a
compacted
surface
Activating the vibratory system on a fully compacted surface may cause the drums
to rebound and momentarily lose contact with the ground. If this occurs while the
machine is on an incline, the machine may slide.
If the drums rebound on the compacted surface, reduce vibration speed or stop
vibration entirely.
WARNING
Crushing hazards. Certain job site conditions or operating practices may adversely
affect machine stability.
f
Follow the instructions below to reduce the risk of tipping or falling incidents.
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