PAGE 18 — MAYCO LS450 CONCRETE PUMP • OPERATION MANUAL — REV. #2 (02/23/21)
GENERAL INFORMATION
Clearing the System After Mix Set-Up
If for any reason the mix should set up in the system, the
following procedure is suggested:
1. Disconnect the hose from the pump and wash the
pump out immediately.
2. Reconnect the hose and fill the hopper with water.
3. DO NOT try to push all the concrete out of all of the
hose lines at one time.
Example: If you had 200 feet of system out, you would
disconnect each hose. Clean it out by pushing water
through the first hose connected to the pump, then
continue progressing through all the hoses, until the
entire system is clean.
4. If waiting time is excessive, it would be wise to wash
out the pump and hoses and start over when the new
truck arrives. This can be avoided by being observant
to the pump and system, also taking into consideration
the above factors (A through D) affecting the mix.
Clearing Concrete Blockage
WARNING
Hose Line Pressure
Use EXTREME CAUTION when disconnecting hoses.
Hoses are under pressure and can whip, causing
severe bodily harm.
NOTICE
If you repeatedly pull the throttle all the way out and
try to force the 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.
If a blockage occurs in a hose, walk the hose until you find
the point of trouble. The hose will be soft immediately past
the blockage. To clear the blockage:
1. Disconnect the hose at the first coupling past the
blockage. Be careful when disconnecting the hose.
The hose is under pressure and could whip and cause
severe bodily harm.
2. Elevate the hose at that point with the blockage area
hanging down.
3. Using a hammer, you can pound the downstream edge
of the packed area until it is free to flow. Shake all of
the sand and gravel out to the end of the hose.
4. Before reconnecting the hose, start the pump and
run a small amount of concrete out to the end of the
hose. This will ensure that all of the separation is out
of the hose.
Clearing Shuttle Tube Blockage
The shuttle tube is blocked if volume at the discharge end
of the hose stops and the hydraulic oil pressure gauge
reads 4,400 psi or more.
Great care must be taken when clearing a blockage in
the shuttle tube, as a dangerous condition will exist from
pressure buildup inside the shuttle tube. With the shuttle
valve, the concrete can be pumped in reverse. Use the
following procedures to clear the shuttle tubes.
NOTICE
Damaged hoses with internal restrictions can cause
blockages.
WARNING
Joint Clamps
DO NOT open any of the delivery system joint clamps
during operation. The clamps are under pressure. If the
clamps are opened during operation, high pressure
material could escape and cause severe bodily harm.
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