Operation
All
S
P Rock Valve Model
s
Startup 250:Users:Danny:Desktop:Operation manuals:line
pumps:All SP Rock Valve models:Frame files:operation.fm
Operation Manual -
97
If you are expecting cold weather for extended periods
of time, such as winter in the northern United States
and Canada, you should change your oil to a thinner
viscosity type, such as an ISO VG 32, which will give
you a lower pour point. Be aware, however, that this oil
cannot protect the components to as high a temperature
as the standard oil shipped with your unit (DTE 15).
Preheating the hydraulic oil
Another option is to preheat the oil before beginning
the pour. This will require that you order a hydraulic
shut-off valve, and install it as shown in Figure 41. The
part number of this valve is 10004680. You will have to
arrive at the job early enough to do the procedure.
Allow about 10 or 15 extra minutes. To preheat the oil:
•
Start the motor, but do NOT rev the engine to
full RPM until the hydraulic oil is warm (at
least 20° Centigrade). If you do, the hydraulic
pumps will not be able to suck the thick oil as
fast as they are turning, resulting in pump
cavitation and damage to the pumps. Leave the
engine at an idle.
•
Close the quarter turn valve.
•
Let the machine idle until the oil is at 20°
Centigrade, then rev the engine to half throttle.
•
Continue heating the oil to 50° or 60°
Centigrade.
•
Open the quarter turn valve.
There’s nothing you can do about a separately laid
pipeline. In most cases, pours that require a separate
pipeline will cancel if it is very cold. If they don’t
cancel, there is a good chance that you will not be able
to get concrete through the line because the slurry will
freeze against the walls of the pipe, then the concrete
will have to be pushed through the pipe dry. This could
result in a blockage. To clear the line, all normal
blockage steps should be taken and additionally, you
have to work fast enough that the concrete doesn’t
freeze before you get it moving.
If the concrete freezes in the pipeline, you are done
pumping until you have warmed up the machine. The
good news is: the concrete will stop setting when it has
frozen. Once you bring the machine into a warm place,
you will be able to clean it.
If the concrete freezes in the hopper, you are done
pumping. Find a warm place to bring the machine and
clean it as it melts.
If the concrete is loaded with calcium chloride, you
will have to keep the concrete alive using the same
techniques used for pumping on hot days. The calcium
chloride accelerates setting, but if it does freeze, the
setting stops. When you do begin to thaw the machine,
the concrete will begin to set again, even more quickly
than on the job, because you are now in a warm area.
Do not waste time when cleaning a machine under
these circumstances.
Be very careful of ice when pumping in cold
conditions. Ice can form on all objects and surfaces.
000174.eps
Motor
A
g
itator quarter turn
shutoff valve (open position)
Figure 41
Quarter turn valve in
s
talled in
the agitator circuit.
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Страница 14: ...Introduction Operation Manual All SP Rock Valve Models 12 revDate NOTES Home TOC TOC Print Print ...
Страница 70: ...Overview Operation Manual All SP Rock Valve Models 68 revDate NOTES Home TOC TOC Print Print ...
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Страница 126: ...Maintenance Operation Manual All SP Rock Valve Models 124 revDate NOTES Home TOC TOC Print Print ...
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