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Hose Lubrication
Before pumping, it is necessary to lubricate the hose.
This procedure prevents separation and blockages in the
hose. Inspect the lines at all times to prevent problems.
Before concrete is discharged into the hopper, it is
suggested that 3 to 4 gallons of water be sprayed into the
hopper, followed by approximately 5 gallons of a creamy
cement and water slurry (1/2 bag of cement to 5 gallons
of water).
Priming The Pump With Slurry Mixture
It is to the successful operation of a concrete
pump that the manifold and all delivery hoses, pipes and
elbows are coated with a film of lubrication BEFORE you
attempt to pump concrete.
Failure to properly prepare the pump and system will result
in a “dry pack” of concrete, blocking the shuttle valve tube
or delivery line.
1. Connect the entire delivery system to the pump. Pour
5 gallons of water and a bag of raw cement into the
hopper.
2. Place the direction control switch to the
position (Figure 26). This will mix the water and cement
into slurry.
Figure 26. Direction Control Switch (REVERSE)
3. Mix the slurry to the consistency of a smooth batter.
4. Position the first ready-mix truck at the hopper. Check
the concrete. DO NOT discharge concrete into hopper
at this time.
NOTICE
Getting the concrete to flow through the hose at the start
of the pumping cycle can be one of the most critical
operations of the pour.
FORWARD
REVERSE
5. Place the direction control switch in the FORWARD
position. This will start the flow of the slurry to the hoses.
6. Keep the slurry flowing until most of it is pumped out.
However, make sure that some slurry is left on the
hopper when concrete is first discharged from the
ready-mix truck.
Pumping
1. Place the pumping control switch in the LOCAL
position (Figure 27) for normal pumping operation.
Figure 27. Pumping Control Switch (Local)
2. Holding the volume control switch (Figure 28) to the
right will increase pumping volume to approximately 10
strokes per minute. Holding the volume control switch
to the left will decrease pumping volume.
Figure 28. Volume Control Switch
3. A thumping sound (cylinder stroke) should be heard.
The thumping sound represents the number of strokes
per minute (volume) of the pump.
Safety glasses and hearing protection
MUST be worn at all times when
operating the pump. Failure to follow
safety guidelines can result in serious
injury.
NOTICE
A well-planned location of the pump and routing of the
hose before starting a pour may save subsequent moves
throughout the job.
LOCAL
REMOTE
CENTER
OFF
INCREASE
VOLUME
DECREASE
VOLUME
+
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OPERATION