Multiquip LS-300 - Manual (Page 28)

PAGE 28 — MAYCO LS300 CONCRETE PUMP • OPERATION AND PARTS MANUAL — REV. #4 (06/21/10)
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 CRITICAL 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 REVERSE
position (Figure 25). This will mix the water and cement
into slurry.
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.
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.
OPERATION
Getting the concrete to flow through the
hose at the start of the pumping cycle
can be one of the most critical opera-
tions of the pour.
PUMPING
FORWARD REVERSE
Figure 25. Direction Control Switch (REVERSE)
A thumping sound (cylinder stroke) should be heard. The
thumping sound represents the number of strokes per
minute (volume) of the pump.
2. Use the volume control (Figure 27) to set the pump volume
to approximately 10 strokes per minute. Turning the
volume control clockwise (CW) will
decrease pump volume,
and counterclockwise (CCW) will increase pump volume.
Figure 27. Volume Control
1. Place the Pumping Control Switch to the LOCAL
position (Figure 26) for normal pumping operation.
LOCAL REMOTE
CENTER
OFF
Figure 26. Pumping Control Switch (LOCAL)
Safety glasses MUST be worn at
all times when operating the pump.
Failure to follow safety guidelines
can result in
serious injury.
WARNING - SAFETY GLASSES
A well-planned location of the pump and
routing of the hose before starting a pour may
save subsequent moves throughout the job.