Multiquip LS-50TD - Manual (Page 31)

MAYCO LS-40D/LS-40TD/LS-50TD PUMP — OPERATION AND PARTS MANUAL — REV. #11 (09/16/11) — PAGE 31
LS-40D/LS-40TD/LS-50TD PUMP — OPERATING PROCEDURES
All admixtures will be shown on the redi-mix
concrete ticket. Before starting the pumping
job, ask the driver of the redi-mix truck to see
the concrete ticket and note the admixtures
that exist and take the proper action.
When pumping long distance or pumping stiff mixes, you can
expect a drop in volume compared to shorter lines and wetter
mixes due to the change in valve efficiency or cavitation.
REMIXTURES
Remixtures that are designed into the concrete mix by the
redi-mix company or an architectural engineering company.
This section lists common admixtures and a brief explana-
tion of their functions:
A. Pozzolith 300 – or the equivalent acts as a water
retarder and a lubricant. On a lean mix, long pushes,
stiff mixes, and vertical pushes, Pozzolith 300R
helps pumpability.
B. MBVR – air entraining, acts as a lubricant.
C. Calcium Chloride – commonly referred to as C.C.,
is used as an accelerator. When pumping a load with
calcium chloride, it is recommended that you wash
out if the waiting time between delivery trucks
becomes too long.
D. Super Plasticizers – acts as an accelerator. The
concrete will look very wet after the super plasticizer
is added, but will begin to set up very fast. Wash out
immediately if you do not have a truck waiting. Super
plasticizers are used mainly on commercial jobs.
E. Red Label – acts as a water retarder and an
accelerator. Red label will be used mainly on com-
mercial jobs.
F. Fly Ash – is used to help increase the strength of
the concrete and decrease the cement content per
yard. This is one of the most common admixtures
used.
Leaking manifold seals or hose coupling
gaskets which leak water can cause separa-
tion and subsequent jamming at that point.
It will be necessary at times to move your pump from
one job site location to another. Before moving the
pump, make sure to pump the remaining concrete out
of the hopper. Moving the pump with a
full hopper of
concrete can cause severe damage or breakage of
the axle and axle springs, excess strain and pressure
on the hub and bearing assembly.
WARNING - TRANSPORTING PUMP
If hoses or lines are blocked for any reason, or if the
lines are kinked when starting up or during the pumping
cycle, the pump pressure could straighten out the kink
or force out the blockage. This rapid surge of material
could cause the lines to
whip or move in a manner
that could cause injury to personnel.
CAUTION - HOSE/LINE BLOCKAGE
7. It is important that once the slurry procedure is
completed, and concrete is flowing through the hose,
DO NOT stop the pour until all the slurry is pumped out
and the concrete has reached the end of the hose. The
only time to stop the pump during the priming procedure
is if a blockage occurs.
8. If it is necessary to replace or add a section of delivery
system, after the initial lubrication procedure, wet the
inside area of the hose, pipe or elbow with 5 gallons of
water per 25 foot length, before adding it to the system.
6. With the pump in FORWARD at 25-30 strokes per minute,
slowly discharge the concrete from the ready-mix truck
into the hopper and completely fill it. Keep the pump
running continuously until concrete is discharging at the
end of the delivery system. If the pump is stopped during
this procedure, a blockage may occur.