MAYCO C-30HDNI PUMP — OPERATION AND PARTS MANUAL — REV. #0 (05/15/03) — PAGE 25
6. 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. If this happens at the start, disconnect the hose
at the first coupling past the blockage.
Elevate the hose at that point with the blockage area
hanging down.
Note: Use extreme care! The hose line is
under pressure and can cause serious injury. Using a
hammer, you can pound the down-stream 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. 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.
7. The manifold is plugged if the volume at the discharge end
of the hose stops, and the hose is soft. The drive belts will
start to slip and the engine will lugdown.
To clear a plugged
manifold, great care must be taken as
a dangerous condition will exist due to pressure build-up
inside the manifold. Follow steps 7A through 7J to un-plug
a clogged manifold.
C-30HDNI PUMP — OPERATING INFORMATION
A. STOP the pump. Switch OFF the engine.
B. DO NOT open any of the delivery system joint
clamps.
C. The
senior operator must warn all others to stand
at least 20 feet away from the pump and turn their
heads away from the manifold.
D. The operator must position himself/herself away
from the hinged side of the manifold.
E. Wearing safety glasses, grasp the clamp arm
weldment and carefully pull it open to the primary
(safety) position. STOP count to 20. This will allow
the pressure to release.
F.
After the pressure has been released, open the
clamp arm weldment and swing the hinged dis-
charge cone open.
G. Remove blockage with a round 2-foot length of
reinforcing steel rod. Flush the manifolds with water.
Make sure the (3” x 2”) reducer is clear of any
blockage before closing the discharge cone.
H. After the blockage has been cleared and the pump
manifold has been thoroughly flushed with water,
close the hinged discharged cone and lock into
place.
I.
Before reconnecting hose to the reducer, start the
engine and pump two or three shovels of concrete
through the reducer. This will insure that all the
blockage has been cleared.
J.
Shake out around 2 feet of concrete before recon-
necting hose to pump. After this is done, connect
hose to pump and resume the pumping operation.
8. If it is necessary to wait 1/2 hour or more for another load of
concrete, and to prevent setting of the mix in the system, it
is advisable to consider the following factors (8A through
8D) affecting the concrete :
A. How old is the concrete?
B. Is there an accelerator, calcium chloride, red label,
etc., in the concrete?
C. The temperature of the day, 80, 90, degrees?
D. How much system you have out and how stiff was the
mix you were pumping?
If, for any reason, the mix should set up in the system, the
following procedure (
8E through 8I) is suggested:
When disconnecting hoses, use
EXTREME CAUTION! The hose is
under pressure!
E. Disconnect the hose from the pump and wash the
pump out immediately.
F.
Reconnect the hose and fill the hopper with water.
G. 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.
H. 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 off the pump, then continue
progressing through all the hoses, until all the system
is clean.
I.
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 (E through H) affecting the mix.
NOTE
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