PAGE 16 — MAYCO LS450 CONCRETE PUMP • OPERATION MANUAL — REV. #2 (02/23/21)
GENERAL INFORMATION
Wet the sponge before placing it in the hose to keep the
slurry from running too far ahead of the concrete, which
will reduce the possibility of separation. When the pump is
stopped, the material can flow slowly down due to gravity
and cause the hose to collapse.
When pumping is resumed, you can expect blockage at
the point of hose collapse. To prevent this from happening,
the hose can be ‘kinked off’ at the discharge end when the
pump is stopped to prevent the gravity flow of the material
in the hose.
The use of stiffer mixes when pumping downhill will
decrease gravity flow of the material in the hose and
will assure a smoother operation between the cam roller
bearing and cam plate. As with any job, make sure that
the hose and the couplings are in good, workable shape.
Vertical Pumping
When pumping more than 40 feet vertically up the side
of a building, the installation of steel pipe—securely
fastened at intervals as necessary to support the pipe—is
recommended. Ninety-degree, long-radius pipe sweeps
should be installed at the top and bottom of the steel line.
Use a 25-foot hose or short section off the pump and use steel
pipe for the balance of the horizontal distance to the vertical
line. This type of installation has been satisfactory on many
jobs being pumped in excess of 100 feet high. Line pressures
are always less using steel pipe as compared to hose.
When pumping vertically using all hose, it is not
recommended to go higher than 50 feet with the hose.
The hose should be tied off at intervals of 10 feet if possible.
Special attention should be given when tying the hose off
at the top as the hose will have a tendency to stretch when
filled with concrete. This will increase the possibility of a
blockage at the point where the hose is tied off. To avoid
this, a long-radius, 90-degree elbow is recommended. The
suggested place to tie off is on the hose, under the clamp.
NOTICE
It is strongly recommended that steel pipe be used
on all vertical pumping for safety and convenience.
Hose Pulsation
A slight pulsation of the hose will always be noticeable near
the pump. Excessive pulsation of the hose near the pump is
normally due to higher than average line pressures caused
by stiff, harsh mixes or extremely long pumping distances.
The use of a 2-1/2" I.D. hose in these extreme cases
reduces line pressures. Or, if permissible, the addition of
slight amounts of water to the mix will allow easier pumping.
The use of certain pumping admixtures may also help.
If excessive pulsation exists in the hose, it is advisable to
use burlap or some other means of wear protection under
the hose at points where the hose may wear through the
outer cover (e.g. over forms, steel, or sharp curbs).
Snap-Joint Couplings
When using snap-joint couplings with gaskets to join hoses,
make sure they are washed clean after each job. Keeping
the hose ends clean (heavy duty) is very important for the
best job setup. A thin coat of grease on the rubber gasket or
dipping both coupling and gasket in water before coupling
the hose will make for easier installation.
Fill the hopper with water after making sure that all sand
and rock have been removed from the manifold. Operate
the pump at full throttle and the 3/8-inch-diameter hole
restriction will create sufficient back pressure to make
thorough inspection of all moving parts.
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