22
10. Mixing time:
After all the ingredients have been added to the
drum, allow time for the material to reach a uniform
color and consistency. Watch the color and consist-
ency of the mixture as the drum is turning. When
the entire mixture becomes a pale green color,
it means the mortar mix is uniformly distributed
throughout the mixture and can be discharged. If
the mixture is not uniform, the mortar will have
weak spots.
11. Emptying drum:
All Mixers are equipped with a lock for anchoring
the drum at the mixing angle. Move the wheelbar-
row or other mortar receiver up to the side of the
Mixer. To empty the drum:
a. Disengage mixing clutch.
b. Release drum lock.
c. Move the wheelbarrow into position.
d. Slowly tilt the drum down.
e. Lift the hinged grill out of the way.
f. Fill the wheelbarrow.
g. Raise the drum back into its mixing position
and lock.
h. Engage mixing clutch.
i. Add half the water and sand for the next
batch. This will help to clean the mixing ele-
ments and inside of the drum.
12. Mixing Elements:
A Mixer can be equipped with paddles or a spiral for
mixing the materials into a uniform mixture. Each
system has adjustable wipers to clean the sides and
ends of the drum. Maintain the wipers at 1/16 to
1/8 inch (1.5 to 3.0 mm) from the drum surface. A
large gap can result in a build-up on the surface.
This build-up will break loose and produce lumps or
chips in the mixture.
13. Preventing Build-up:
To maintain high quality mixing, consistent per-
formance and machine life, thoroughly clean the
mixer inside and out at the end of each day.
Under normal operating conditions, adding water
and sand and some aggregate to the drum immedi-
ately after emptying will wash and clean the mixing
elements and the inside of the drum and keep them
clean providing the wipers are set at 1/16 to 1/8
inch (1.5 to 3 mm) from the drum surface. If a slow
build-up is occurring, add water and coarse sand to
the drum at the end of the working day and let it
run for 15 minutes.
NOTE
The Mixer is equipped with a solid grill
and bag splitter over the drum opening.
Place the bag of material on the grill/split-
ter and let the material fall into the drum.
Repeat with the next bag until the required
amount is added.
Fig. 10 FILLING
14. Removing Build-up:
Always disable the machine by unplugging the
power cord or disconnecting the spark plug wire.
Dried mix should be scraped out as necessary. DO
NOT strike the outside of the drum with a shovel,
hammer or other device to break up and loosen any
build-up, as this will dent and damage the drum.
At the end of the working day, thoroughly wash the
inside of the drum and the outside of the machine to
remove any residue build-up or clumps. Do not get
water on the electric motor or gas engine.
15. Drum speed:
The best mixing action occurs when the mixing ele-
ments are turning 30 to 35 RPM for the paddles and
40 to 45 for the spiral. Do not operate outside of this
speed range. Increasing the mixing element speed
does not signicantly change mixing characteristics.
Mixing time is much more important and the mix-
ture must be thoroughly blended to obtain uniform
and consistent mortar.
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