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C-30HD — PARTS & OPERATION MANUAL — REV. #4 (03/06/01) — PAGE 17
C-30HD OPERATING INFORMATION
12. Slight pulsation of the hose will always be noticeable near
the pump. Excessive pulsation of the hose near the pump is
normally due to higher than average line pressures caused
by stiff, harsh mixes, or extremely long pumping distances.
The use of 2 1/2” I.D. hose in these extreme cases reduces
line pressures or the addition of slight amounts of water to the
mix, if permissible, will permit easier pumping. The use of
certain pumping admixtures may help.
If excessive pulsation exists in the hose, it is advisable to use
burlap or some means of wear protection under the hose at
points where the hose may wear through the outer cover; e.g.
over forms, steel or sharp curbs.
13. If the cam roller does not ride on the cam profile smoothly,
it may be caused by insufficient line back-pressure; e.g., a
wet mix with only 50 feet of hose. Add more hose as necessary.
It can also be caused by cavitation or the passing of over-
sized aggregates through the valving, causing it to skip.
14. When using Snap-Joint couplings with gaskets to join hose,
see that they are washed clean after each job. Keeping the
hose ends clean (heavy duty) is very important for the best
job setup. A thin coat of grease on the rubber gasket or dipping
both coupling and gasket in water before coupling the hose
will make for easier installation.
15. All new pumps are “water pressure tested” at the factory
before shipment. This procedure permits a thorough inspection
of entire drive system and valving under simulated full load
conditions. The pump owner can do the same by attaching
an adaptor to couple to the end of the discharge cone; e.g.,
the use of a standard 2” pipe cap with a 3/8” hole drilled in the
center , screwed on to the end of the hinged cone or reducer
at the pump. Fill the hopper with water after making sure that
all sand and rock have been removed from the manifold.
Operate the pump at full throttle and the 3/8” diameter hole
restriction will create sufficient back-pressure to make a
thorough inspection of all moving parts.
16. Before starting the pumping operation, the following check
list procedure should be followed:
1. Check the engine oil.
2. Check the oil reservoir of the lubrication system to make
sure that it is full.
3. Inspect the chain and belt adjustment.
4. Check the cam oiler.
5. Start and run the engine a minimum of five minutes before
starting the pumping operation.
Note: When the redi-mix truck arrives, it is always a good idea
to check the concrete ticket and make sure you have the
proper mix design.
CLEAN UP PROCEDURE
PART A
1. Ensure that there is no blockage in the hose and line (See
Page 15, Para. 6) or in the manifold (See Page 15, Para. 7). If a
blockage exists, clear it as it dictates how the machine will
pump the next time it is used. At the end of every pour, or
because of long delays during a pour, the pump and delivery
system must be thoroughly cleaned by removing all concrete
material.
2. Proper wash out of all materials or build up within the pump
manifold and hoses following the pumping operation will
prevent problems when starting the next job. After completion
of the pour, pump the remaining concrete in the hopper
through the discharge line.
3. Note: To avoid the possibility of separation during clean-up,
do not pump the concrete below the inlet ball in the hopper. It
is best to leave approximately 3 to 4 inches of concrete above
the inlet ball.
4. Turn the pump engine off before filling the hopper with water.
Engine vibration at idle may “separate” material in the hopper,
causing jamming in manifold when pumping is resumed.
5. Fill hopper with water and resume pumping. The water will
push the concrete through the line. When the water runs clear
at the end of the hose, disconnect lines and shake out all the
sand and sediment so the lines will be clean for the next pour.
6. It is important that the hinged discharge cone on the pump
manifold be opened and all remaining concrete (rock and
sand) be thoroughly washed out. This must be done after each
job to prevent concrete build up in the discharge manifolds
and 3” discharge elbow.