Multiquip LS-600P - Manual (Page 19)

MaYCO LS600p CONCReTe pUMp • OpeRaTiON MaNUaL — Rev. #0 (05/13/13) — page 19
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. Reconnect the hose and fill the hopper with water.
DO
NOT try to push all the concrete out of all of the hose
lines at one time.
4. For example: If you had 200 ft. of system out, you
would disconnect each hose. Clean it out by pushing
water through the first hose connected the pump, then
continue progressing through all the hoses, until all the
system is clean.
5. 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 actors (A through D) affecting the mix.
Clearing Concrete Blockage
WaRNiNg
Hose Line Pressure
When disconnecting hoses, use extreme CaUTiON.
The hose is under pressure. Hose could whip and cause
severe bodily harm.
NOTICE
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.
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 hose. Hose
is under pressure. Hose 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 assure that all of the separation is out
of the hose.
Clearing Shuttle Tube Blockage
The shuttle tube is plugged if volume at the discharge end
of the hose stops and the hydraulic oil pressure gauge
reads 4400 psi or more.
To clear a plug in the shuttle tube, great care must be taken
as a dangerous condition will exist from pressure build-up
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. The
clamps, if opened during operation could allow high
pressure material to escape and cause severe bodily
harm.