Multiquip ST70 - Manual (Page 26)

PAGE 26 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
14. Vertical and down-hill pumping are more difficult than
horizontal pumping. Vertical pumping requires higher
pumping pressure. Down-hill pumping can cause
separation of the concrete, which can cause a blockage.
Back pressure must be kept in the line at all times during
down-hill pumping.
15. When the pump is parked in the street, position it so that the
control panel (right side) is closest to the curb. – ALWAYS
THINK SAFETY!
16. Lower and lock the rear jackstands in place before any
concrete is discharged into the hopper.
17. THE DELIVERY SYSTEM
To successfully pump concrete it is critical to use the correct
size and type of delivery system.
The rules that govern the size of the delivery system apply
to all concrete pumps, not just Mayco pumps.
The inside diameter of the hose and pipe must be three to
four (3 to 4) times the size of the largest aggregate in the mix
that is to be pumped.
Example:
1-1/2" rock (8 to 10% max. content by weight) requires
a 5" dia. concrete delivery system.
1" rock (10 to 15% max. content by weight) requires a
4" dia. concrete delivery system.
¾" and under rock (10 to 15% max. content by weight)
requires a 3" dia. concrete delivery system.
The rock size and percentage shown is of the total rock content
in the mix. The balance of the rock must be properly blended
down through all of the smaller sizes.
The same applies to the sand portion of the mix.
Consult the ready-mix company and ensure that they are willing
and able to deliver properly blended aggregates in their
concrete. 3" inside diameter is the smallest system of hose,
pipe and elbows that is recommended for pumping “Hard Rock”,
large aggregate concrete.
Remember – The larger the size of the delivery system, the less
pressure required to move the concrete.
Use this information in conjunction with “Concrete Mix Design”
on pages 12 thru 17.
Important Rules for the Setup and Operation of
Mayco Model ST-70 Hydraulic Concrete Pump
1. The Mayco pump must be operated by experienced
operators, who are qualified with the particular model being
used, or students under the direct supervision of an
experienced operator. The operator is in complete charge
of the pump and delivery system. Know and warn all others
of the DANGERS that are present when using, maintaining
or being around this pump and delivery system. KNOW
YOUR MACHINE!
2. The operator must become familiar with the controls and
gauges by a careful study of the owners manual.
3. The operator must become aware and understand the
danger involved in the operation and maintenance of the
pump.
4. The operator must know the limitation of the pump described
in this manual.
5. The concrete pump is capable of developing high pressures
on the concrete. Proper care must be used in the
maintenance of pipes and hoses and hose couplings for
safe operation.
6. Only experienced operators, or students under the direct
supervision of an experienced operator shall perform any
maintenance, cleaning, repair or setup operations.
7. Unauthorized persons must not be permitted to assist or
remain in the immediate vicinity of the unit while it is in
operation.
8. The Mayco pump must not be operated by individuals who
cannot read and understand the owners manual in the
language in which it is printed.
9. The Mayco pump must not be operated by anyone under
the age of 18 years.
10. The Mayco pump must not be operated by anyone under
the influence of alcohol or drugs.
11. Locate the pump in an area as level as possible, where two
or more ready-mix trucks will have access to the hopper.
12. Begin pumping by placing the hoses or pipe at the farthest
point of discharge.
13. Concrete will flow with less back pressure through pipe
than through hose. Bends in hose or pipe will also require
more pressure. The operator should take these facts into
consideration when laying out the system.
ST-70 — OPERATING PROCEDURES