72
Operation
SPB Operation Manual
Do not drag system with boom
All of the strength of the boom is in the vertical direc-
tion. For this reason, never drag anything with the boom
from side to side. If it would get caught on anything,
there is a good chance that you could bend the boom
or guide levers. When this happens the boom will no
longer fold up into its original position and is no longer
structurally sound.
Blockages
If you have a blockage in your pipeline that you cannot
remove by the backward / forward rocking motion, you
will have to disassemble the pipeline to find it. You will
almost always find the blockage in a reducer, hose or
elbow unless one of the delivery pipes has a hole in it or
one of the clamps has a bad gasket. Before you disas-
semble the pipeline, you must relieve the pressure by
pumping in reverse for several strokes.
Expulsion hazard. Never open a
pressurized pipeline.
To disassemble the pipeline:
1. Pump in reverse for several strokes to relieve the
pressure in the line.
2. Use your hammer to locate the blockage by tap-
ping the pipeline. (“Tapping” is the key word here.
You can damage the pipe by striking it hard.) A
pipeline that has been relieved sounds different
when tapped than a pipe that is pressurized. An
empty pipe has a definite reverberating “tong”
sound, a relieved pipe has a meaty “thak” sound,
and a pressurized pipe has a thin “tick” sound be-
cause the forces on the steel do not allow the pipe
to vibrate. Consider tapping your pipeline in each
of these configurations when there is no blockage,
just to become familiar with each sound.
3. After locating the blockage and relieving the pres-
sure, carefully remove the clamps from the blocked
pieces. If you are not wearing a full face shield,
turn away from the clamp as you pull the handle.
If you have relieved the pressure, there should be
no problem; however, some blockages can store
pressure or trapped air if there is another blockage
somewhere else in the line. After the clamps have
been removed and concrete is flowing from the
force of gravity, the danger of excessive pressure
is past.
4.
Remove the blockage from the affected piece of
system by elevating it and tapping on the pipe or
hose again, being careful not to hit the piece hard
enough to cause damage.
5. After the blockage has been removed, clean up
the clamp, gasket, and pipe end. If you must wipe
off the concrete with your hands, be sure to wear
gloves. If your hands come in contact with con-
crete, wash it off immediately.
6. Reassemble the pieces, and pin the clamps.
7. Begin pumping in the forward position, slowly
at first, until you are sure that there are no more
blockages.
Do not use air to remove a blockage. Your concrete
pump has much more pressure available than an air
compressor. In addition, air that is compressed builds a
reservoir of pressure that will continue to be dangerous
even when the compressor is shut off.
Figure 40
Wash system as it’s removed
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