Multiquip LS-600P - Manual (Page 20)

page 20 — MaYCO LS600p CONCReTe pUMp • OpeRaTiON MaNUaL — Rev. #0 (05/13/13)
Reverse Pumping Procedure
1. Switch the pump into reverse. With pump speed at a
medium-slow (approx. 12 strokes per min.) try to pull
the “pack” back into the hopper with 5 or 6 reverse
strokes.
2. Remix the concrete in the hopper.
3. Switch the pump into forward. If it is still plugged, repeat
“Reversing” procedure three times.
4. If concrete still does not move, proceed to the Shuttle
Tube Inspection Procedure.
Shuttle Tube inspection procedure
1. Stop the pump. Turn off the engine.
2. The senior or most experienced operator must warn all
others to stand at least 20 feet away from the machine
and turn their heads to face away from the pump.
3. The operator will position himself beside the reducing
elbow at the pump outlet. Wearing safety glasses, slip
the end of a pry bar (24" length of reinforcing steel rod)
under the latch of the hose clamp and flip it up.
4. Carefully knock the end of the hose away from the
reducer.
5. Chip the concrete out of the reducer with the pry bar.
DANGER
Accumulator Pressure
Make sure the accumulator pressure
gauge reads ZERO psi. prior to
performing any maintenance or
inspection.You must follow lock
out-tag out procedures. Improper
accumulator pressure can result in
an explosion causing serious injury
or death.
GEnERAL InfORMAtIOn
6. Remove the reducer. From the discharge end, chip
the concrete out of the shuttle tube with the pry-bar.
If concrete cannot be loosened from the outlet of the
shuttle tube, remove the clean-out plug on the bottom
of the hopper to discharge the concrete.
7. Chip the blockage out with the pry-bar.
8. Flush the shuttle tube with water.
9. Before resuming operation of the pump, perform the
“Reverse” Pumping Procedure to relieve pressure on
the shuttle tubes.