Task Step Key Points
3. Initial ground breaking.
First operate the water blaster from a
distance to wet the ground or completely
wet it with a garden hose. This will
minimise dust generation.
As the ground becomes wetter, bring the
water blaster nozzle closer to the ground
surface, but not too close to cause
extensive splash back.
When loose ground is produced by the
water blaster, vacuum it away with the
vacuum hose nozzle with a maximum of
50% of the nozzle in the material.
DO NOT plunge the nozzle completely
into the ground as this will result in loss of
vacuum and thus no material removal.
REMEMBER!!!
DO NOT suck dry dusty ground
material, otherwise the machine
dust filters will become clogged
resulting in reduced or no
suction.
4. Working the exposed
face.
When the initial section of material has
been removed, it will form an edge.
It is best for the water blaster operator to
blast and break away the exposed edge
whilst the vacuum hose operator sucks
away the loosened material.
Reduced suction 1. Operator notices reduced
or no suction.
ACTIVITY
If reduced suction is noticed,
check the following: -
Suction nozzle is completely
covered. Remove whatever is
covering the nozzle. DO NOT
plunge the complete nozzle in
solids or liquids.
Blocked suction hose. A large
object may have lodged in the
suction hose and a blockage
has built up around it. Shut
down the engine, remove the
suction hose and remove
blockage.
Engine speed has dropped or
stopped. Check if the engine
has run out of fuel.
Full collection drum. Empty the
drum.
Blocked filter. Shut down the
machine, remove and clean the
filter.
Added length of suction hose.
Reduce suction hose length to
standard supplied length.
12
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