Multiquip LS-300 - Manual (Page 29)

MAYCO LS300 CONCRETE PUMP • OPERATION AND PARTS MANUAL — REV. #4 (06/21/10) — PAGE 29
OPERATION
If hoses or lines are blocked for any reason, or if the
lines are kinked when starting up or during the pumping
cycle, the pump pressure could straighten out the kink
or force out the blockage. This rapid surge of material
could cause the lines to
whip or move in a manner
that could cause injury to personnel.
CAUTION - HOSE/LINE BLOCKAGE
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
cavitation.
6. It is important that once the slurry procedure is
completed, and concrete is flowing through the hose,
DO NOT stop the pour until all the slurry is pumped out
and the concrete has reached the end of the hose. The
only time to stop the pump during the priming procedure
is if a blockage occurs.
7. If it is necessary to replace or add a section of delivery
system, after the initial lubrication procedure, wet the
inside area of the hose, pipe or elbow with 5 gallons of
water per 25 foot length, before adding it to the system.
5. Rotate the Volume Control Knob (Figure 27) to the
right to increase the volume to 25-30 strokes per minute.
Place pump control switch in the center “OFF” position.
Slowly discharge the concrete from the ready-mix truck
into the hopper and completely fill it. Place pump control
switch in the local “ON” pumping position. Keep the pump
running continuously until concrete is discharging at the
end of the delivery system. If the pumping operation
suddenly stops with no concrete discharging from the
hose, a blockage may have occurred. Immediately place
the switch in the “OFF” position. Refer to Clearing
Concrete Blockage Section.
Figure 29. Hydraulic Oil Temperature Gauge
4. Let the pump cycle until the hydraulic oil temperature
(Figure 29) is approximately 50° to 60° F.
HYDRAULIC OIL
TEMPERATURE
THROTTLE ON
STROKES: 100
STROKES/MIN 10.0
YDS/HR 0.0 7
Figure 28. Strokes Per Minute Display
3. Scroll through the Digital Readout Screen with the scroll
switch to go to Screen 7 (Figure 28). This screen will show
the volume in strokes per minute.