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PAGE 24 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)
ST-45 PUMP — OPERATING PROCEDURES
OPERATING SUGGESTIONS
1. A well-planned location of the pump and routing of the hose
before starting a pour may save subsequent moves through-
out the job.
2. Before concrete is discharged into the hopper, it is suggested
that 3 to 4 gallons of water be sprayed into the hopper,
followed by approximately 5 gallons of a creamy cement and
water slurry (1/2 bag of cement to 5 gallons of water). This
procedure lubricates the hose and prevents separation and
blockages in the hose.
Getting the concrete to flow through
the hose at the start of the pumping
cycle can be one of the most critical
operations of the pour. (
Manually
operate the throttle when starting,
NOT REMOTELY)
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.
Inspect the lines at all times to prevent the above conditions
3. It is important that once the slurry procedure is completed,
and you have started concrete 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 at the start is if a blockage occurs.
4. When the pump is stopped for any reason during a pour; e.g.,
moving hose, waiting for redi-mix truck, the following sugges-
tions are offered:
A. Leave the hopper full of concrete at the time of
shutdown. It is important not to let the
redi-mix
driver
wash too much water into the hopper, as this could
cause separation of the concrete in the hopper.
B. If the
shutdown
period exceeds 2 to 3 minutes, turn
off the engine so the vibration does not separate the
mix in the hopper which can cause a blockage in the
manifold when the pump is started.
C. If it is necessary to wait 10 minutes or more for another
load of concrete, it is wise to start the pump and pump
6 or 8 strokes every 5 minutes to prevent setting of the
mix in the system. If waiting time is excessive, it would
be wise to wash out the pump and hoses and start over
when the new truck arrives.
D. When pumping stiff mixes and there is waiting time
between redi-mix trucks, it is advisable to add some
water to the last hopper of material and “hand mix” to
ensure an easier start with the following load.
E. When the pumping job requires a stiffer mix, the
following method is suggested for starting: Take a
water hose with a nozzle on it and apply water with a
fine spray to the concrete as it comes down the redi-
mix chute into the pump hopper after the slurry
procedure is completed and you are ready to start
pumping.
Using this procedure will make it easier to pump
through the clean hose. Note: Once the concrete has
reached the end of the hose, do not apply any more
water in this manner as this procedure is used for
starting only.
F. Hose sizing is very important: We strongly recom-
mend on harsh mixes, vertical pushes, stiff concrete,
shotcrete, long pushes, that a 2 -1/2” line be used as
far as possible. The advantages of using the 2 -1/2” line
are improved pumpability, less pumping pressure and
less wear on the pump.
5. Following the pump operation, proper wash out of all mate-
rials or “build-up” within the pump manifold and hoses will
prevent problems when starting the next job.
6. A thorough inspection of the drive components and greasing
of all bearings after each job will ensure adequate lubrication
and service to the pump which is normally operating in wet,
gritty conditions.
Over-greasing any
bearing
on
your Mayco pump will not damage
the bearing.
NOTE
NOTE
CAUTION