PAGE 24 — MAYCO C-30HDNI PUMP — OPERATION AND PARTS MANUAL — REV. #0 (05/15/03)
WARNING
Common sense tells us that if you drive a truck
into a brick wall, something is going to be
damaged. The same holds true with your
concrete pump. If you repeatedly pull the throttle
all the way out and try to force your pump to
push through
blockages due to separation
of material in the hose or manifold, you will
soon have breakdowns and costly repairs which are not covered
under warranty. If a blockage occurs, find where it is and clear it
before further pumping. DO NOT increase the engine speed to
clear the blockage. Increasing the engine speed will only
compound the problem.
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
C-30HDNI PUMP — OPERATING INFORMATION
Pumping Tips
1. The effects of heat and excessive time on concrete: Hot
concrete, commonly referred to as a hot load, is concrete that
has been in the redi-mix truck in excess of 2 to 3 hours. On
a hot day, this amount of time is even less. A brief explanation
of why heat and time affect concrete:
Concrete starts setting by drying up through a chemical
reaction. The catalyst to this reaction is heat. When pumping
a hot load, it is important to remember that when you have
to stop pumping for any reason, add water to the concrete
in the hopper and hand mix and move concrete in the hose
every 5 minutes. If the shut down time becomes too long,
wash out immediately.
2. ADMIXTURES: Remixtures that are designed into the
concrete mix by the redi-mix company or an architectural
engineering company. This section lists common admix-
tures and a brief explanation 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 be-
comes 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.
All admixtures will be shown on the
redi-mix concrete ticket. Before start-
ing 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.
3. 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 cavi-
tation.
4. Leaking manifold seals or hose coupling gaskets which
leak water can cause separation and subsequent jamming
at that point.
5. Damaged hoses with internal restrictions can cause block-
ages.
NOTE
Go to Discount-Equipment.com
to order your parts
