Schwing SP 500 - Page 143

143
Appendix
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
licensed, but the work should still be completed by
a competent professional. Under no circumstances
should high-voltage connections be made by a con-
crete pump operator or related personnel.
Maintenance
All procedures for servicing, inspection, and repair of
concrete pumps and related equipment and devices.
Maintenance and inspection are methods of main-
taining the desired state of the equipment. Repair is
the method of restoring the desired state of the equip-
ment.
Maximum Pressure
When talking about a hydraulic system, maximum
pressure refers to the highest pressure that can be
achieved with the settings of the circuit relief valves.
When discussing concrete output, maximum pres-
sure refers to the pressure that will be developed
if the hydraulic system pressure reaches the relief
valve setting. Concrete pressure is always the force
at which the di󰀨erential cylinders are moving, divid-
ed by the cross-sectional area of the concrete cylin-
der. Maximum concrete pressure, then, is developed
when the di󰀨erential cylinders are moving with maxi-
mum force, which is determined by the hydraulic sys-
tem relief valve setting. During normal pumping, the
resistance of moving the concrete through the pipe
or boom creates the pressure needed by the pump
and is well under the maximum pressure. See Also:
Concrete Pressure
Minimum Safety Distance
In this manual, the term “minimum safety distance”
refers to the closest distance that you are allowed
to approach an object or electrical wires while leav-
ing room for errors in human judgment or machine
malfunction. The distance from electrical wires in the
United States is 20 feet, as recommended by the
American Concrete Pumping Association. This dis-
tance may have other values in di󰀨erent countries.
Murphy’s Law
An old adage that says: “Anything that can go wrong,
will go wrong, and at the worst possible moment.”
Operational Area
The area around a working piece of equipment or
point of discharge where dangers can be encountered
because of the nature of the machinery or process in
use. For safety reasons, do not allow unauthorized
presence in the operational area.
OSHA
Occupational Safety and Health Administration. A
branch of the U. S. federal government that deals
with job safety. It establishes and enforces safety reg-
ulations for industry and business. One of the areas
over which it has authority is construction job sites
and workshops.
Personal Protective Apparel
Things you can wear to protect yourself from poten-
tial dangers in a concrete placing environment. Ex-
amples are:
• snug-tting work clothes
• steel-toed work boots
• lime-resistant gloves
• safety glasses
• ear mu󰀨s or ear plugs
• rubber boots - standing in concrete
• hard hat
Point of Discharge
The location on the machine from which concrete is
expelled from a delivery system. This can be the point
of placement (the actual form that is being lled with
concrete) or the cleanout area after completion of a
job.
Pour
Used by the concrete pumping industry and in this
manual as a noun. It is the specic job for the pump
during any given time period, e.g. “We’ll grab lunch
right after the pour.”
Prime Mover
The primary power source for a hydraulic system.
The term “prime mover” denotes neither an internal
combustion engine nor an electric motor.
PTO (Power Take O󰀨)
A switchable output from the transmission or an in-
termediate gearcase. On a concrete pump, the PTO
is used to divert the power from the engine and drive
train to turn the hydraulic pumps.