Stability
Stability
Greetings
Instructor
Stuart Quiney
Lesson title: stability
Stability
Link
back
Power lines
Any questions on that lesson
Stability
 confirmation
 1:
what is the minimum height under 275kva
power lines?
 7m
 2 : what is the minimum height under 11kv
power lines?
 5.2m
Stability
Object
of new lesson
 Definitions of lateral and
longitudinal stability
Causes of lateral instability
 Causes of longitudinal instability
 The importance of maintaining
machine stability
Stability
 Introduction
 Why
you need to know about stability
of a forward tipping dumper
 Site conditions change ,
 Routes change,
 Different spoils and materials,
 Live loads .
Stability
 Definitions
of lateral and longitudinal stability
 The definition of lateral stability:
 The stability of a forward tipping dumper from
side to side or from wheel to wheel
 The definition of longitudinal stability:
 The stability of a forward tipping dumper from
front to back or vice versa
Stability
 Causes
of lateral instability
 Lateral instability can be caused by
 Soft tyres, soft ground ,
 trench collapsing ,holes ,
 driving along slopes to fast,
 turning uphill on slopes to fast,
Stability
 Causes
of lateral instability(cont)
 Obstacles , travel with the skip up,
 Shifting loads or live loads (concrete)
 Moving when tipping high tip skips
 Loads sticking in the skip
Stability

Causes of longitudinal instability
 Causes
 travel
 Load
of longitudinal instability can be
up or down a slope wrong direction ,
sticking in the skip when tipping
Stability
 Causes
of longitudinal instability
 Driving
to close to a open trench ,
 Excessive
breaking,
 Overloading,
Stability
 The
importance of maintaining the machine
and load stability
 It
very important to maintain the stability
at all time when operating a loaded and a
unloaded dumper the consequences of not
could lead to death or damage to persons
or property .
Stability
 The
importance of maintaining the machine
and load stability (cont)

the dumper could turn over
 You
could injure yourself ,
 You
could injure others around you,
 You
could loose the load,
Stability
 The
importance of maintaining the
machine and load stability (cont)
 You could damage the dumper
Stability
 Final
 Any
confirmation
questions on the whole of our lesson ?
 1:
Which direction would you travel up a slope with a
empty dumper
 You
reverse up the slope engine is the heavy end
 2:
why would you check the route you are driving a
dumper
 to
reduce chances of compromising you stability
Stability
 Final
 3:
confirmation
what is a live load
A
load that can move within the skip
shifting the weight
 4:
what can happen if a dumpers lateral
stability is compromised

it can turn over sideways
summary
 definitions
of lateral and longitudinal
stability
 Causes of lateral instability
 Causes of longitudinal instability
 The importance of maintaining
machine stability
Look forward
Your
next lesson will be basic
hydraulic system
Thank you