General Information - MULTIQUIP MAYCO Series Operation Manual

The following operating principles and operating suggestions
should prove helpful in the successful operation of your
concrete pump. Your new "small line" concrete pump has
been designed to give you many years of service when
operated properly. A study of the following paragraphs is
important to the successful operation of your new Direct-
flow Concrete Placer.
All concrete pumps require a high level of operator skill and
more frequent service than most of the other construction
equipment. The highly abrasive nature of concrete under
pressure makes it extremely important that expendable
wear components be inspected at regular intervals between
jobs to prevent having to replace these items during a pour.
Experience has proved that inconsistency of batched
concrete mixes and frequent moving of the line requires the
operator to be readily available at all times during pumping
to stop the pump and prevent abuse to the unit which may
occur if unexpected blockages develop.
PUMP MIX GUIDELINES
When ordering concrete, be certain to advise the concrete
supplier that you require a "pump mix". The Direct-flow
manifold will pump a wide variety of materials, but certain
basic principles must be followed to assure successful
pumping, as follows:
Generally speaking, the washed concrete sand and
#4 aggregate (pea gravel) should conform to A.S.T.M.
standards in regard to sieve analysis. Sands in some areas
are washed clean of the #100 and #200 mesh fines, which
results in separation and jamming in the manifold while
pumping under pressure.
If this condition develops, check with your concrete
suppliers engineers and get their recommendations for
supplementing the lack of the fines. The use of locally
accepted ad-mixes may be required. (For example,
Pozzolith, Bentonite Clay, Plastiments, etc.) When properly
prescribed, additives form the plastic paste sometimes
necessary to hold the cement and aggregate together.
NOTICE
If jamming conditions in the pump or hose occur for
any reason at all, do not attempt to use more power to
correct the condition.
Determine the cause of jamming, correct it and resume
pumping. Trying to force material through under jammed
conditions may result in damage to the drive system, thus
voiding any warranty services
PAGE 14 — MAYCO C30HDGA CONCRETE PUMP • OPERATION MANUAL — REV. #1 (09/09/19)

GENERAL INFORMATION

As a general rule, the use of approximately six sacks of
cement, 70% washed concrete sand and 30% #4 pea gravel
per yard of concrete will result in a pumpable mix. The
ideal nature of sand and rock in certain areas may permit
you to increase the percentage of rock or adjust the mix
considerably to meet the job requirements. When possible,
you may experiment with various mixes in your area to
determine the degree of versatility of the Direct-flow Pump.
Uniform gradation of the washed concrete sand and the
1/2" minus aggregate along with sufficient cement content
and water are important to a successful pump operation.
A recommended pumpable mix design would be 70% sand
and 30% aggregate-cement content to be a minimum of
6 sacks. (564 lbs.)
NOTICE
Your local sand and rock engineers will give you the
S.S.D. weights of sand and rock required in your local
area which will yield one cubic yard per the above
recommendation.
Sample Design Mix - 3000 Psi 3/8 in. Slump 4- 5 in.
Type II Cement 6.49 sack/cu. yd
Sand Sat. Surf. Dry
#4 Gravel Sat. Surf. Dry
#3 Gravel Sat. Surf. Dry
Water 48 Gallons
Total Weight
Admixture WRDA-79
Water
Test laboratory data has proven in many areas that the
above mix guidelines have produced concrete rated at
3000 psi (28 day test) and upwards of 5000 psi with an
increase in cement.
In some areas where the gradation of sand and rock is ideal
and sufficient cement is used along with admixtures, the
Mayco small line concrete pump will handle up to a 50-50
ratio of sand and rock.
When the mix is designed for wet gunning applications, it
is normal to increase the cement (up to 7.5 or 8 sacks) and
change the sand to rock ratio to 85% sand and 15% rock.
The Mayco concrete pump will valve efficiently when using
cellular-foam concrete mixes upwards of 70 lbs. per cubic
foot wet density. Below 70 lbs. materials (roof decks), the
valving becomes inefficient.
611 lbs.
2000 lbs.
864 lbs.
0 lbs.
400 lbs.
3,906 lbs
26 oz.
7.40 gal/sack