Marshalltown 600CM Mixer - Manual (Page 7)

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STORAGE
For short term storage, clean the mixer and store in a dry place. If the mixer is not to be used for an extended period of
time, service mixer completely and store it in a dry place.
1.
Refer to motor/engine instructions for storage instructions.
2. Cover exposed metal surfaces with a thin coat of SAE 30 engine oil.
3. Lubricate per instructions under LUBRICATION & STORAGE section.
GETTING READY FOR MIXING
Lay out forms for your concrete floor, patio, driveway, sidewalk, etc. The quality of concrete is directly related to the quality of
the cement paste. The quality of the paste, in turn, is directly related to the amount of water mixed with the cement. For a
given amount of cement, as the amount of mixing water is reduced, the strength of the paste increases, making the concrete
stronger and more durable. Calculate the proportions of your mix components (cement, sand and coarse aggregate)
according to the job specifications.
LOADING THE MIXER
Start the mixer. Refer to motor/engine instructions. After drum has started rotating, pour about half of the water in the drum.
NOTE: The drum my leak slightly when first used. This will stop after a few batches. Add aggregate (gravel) first then
cement and last sand.
MIXING INSTRUCTIONS
1. Start the drum rotating.
2. Add water.
3. Add cement and one shovelful of coarse aggregate. The coarse aggregate will break up any lumps in the cement.
4. Add remaining aggregate: crushed stone, pit-run gravel or sand.
5. Mix batch for approximately one minute. Drum speed should be about 25 r.p.m.
UNLOADING THE MIXER
Refer to Fig. 1
Allow the entire mixture to mix for one full minute. Do not stop mixer from rotating.
Hold the tilt handle and unlock the stop lever. Dump concrete to either side by tilting
the tilt handle in the direction required. Before reloading the mixer, slowly pour a pail
of water over the lip of the drum, permitting water to clean the inside of drum. Mix
batch for approximately one minute. Drum speed should be about 25 r.p.m. When
cleaned, dump water. Now you are ready for your next batch.
CLEANING THE MIXER
After each run of concrete has been poured, do the following: With the drum rotating, spray water into drum permitting the
water to run down the inside and outside of drum. Add one shovel full of coarse aggregate and permit this mixture to scour
the inside of drum for about two minutes. This practice will help keep the drum clean, which is essential in obtaining the best
mixing result. Never permit concrete to harden on either the inside or outside of drum.
EXTENSION CORDS-ELECTRIC MOTOR
The following size extension cords should be used for this mixer: length of cord, up to 100 ft-14 gauge wire; up to 200 ft-12
gauge wire; up to 300 ft – 10 gauge wire; up to 400 ft – 8 gauge wire.
CARE OF MIXER
It is important to keep the inside of the mixing drum free of hardened concrete. After discharging the last batch of concrete
each day, add a pailful of water and two shovelfuls of gravel to the drum. This will scour the inside of the drum. Mix for
about two minutes, discharge and rinse the drum with water.
Fig. 1