Minnich MINNICH, Operators & Service Manual

Page: 9 / 13

9
GENERAL SAFETY
tach Manual
Connect/start
Storage
If the vibration intensity drops, check that the
filters are not clogged or that hoses are not
kinked.
To properly store unit after use, hang the
vibrator with the head up and set the handle
(variable control assembly) in the open position
to permit the discharge of possible impurities,
contaminants and water.
Placement and consolidation
The force exerted by an internal concrete vibra-
tor is controlled by the weight and the speed
at which the eccentric rotates. The centrifugal
force exerted can be arrived at by various com-
binations of weight (size of eccentric weight)
and the speed at which the weight rotates. For
years the most favorable working speed for a
vibrator was considered to be around 10,200
RPM (VPM) and consequently this figure is used
in many vibrator comparisons. More recently,
the optimum speed for compaction has been
accepted as being between 7500 and 9000
RPM.
∆ CLEAR AIR SUPPLY LINE : Before connecting
vibrator, clear the compressed air supply
line of possible impurities, contaminants and
water.
∆ LUBRICATE : Every day or every four hours
of continuous service, pour a ½ teaspoon
of non-detergent oil into the quick release
coupling. NOTE: An optional oiler/strainer is
available.
∆ The relationship between speed and centrif-
ugal force of a vibrator is not a straight line
function. The centrifugal force varies as the
square of the speed. This results in that a
10% change in RPM will be reflected by a 21%
change in the centrifugal force and a 20%
change in RPM will be reflected by a 44%
change in the centrifugal force.
∆ When concrete, a mixture of cement, sand,
aggregates and water, is placed it contains a
high volume of entrapped air. If the concrete
is allowed to harden in this condition, it will
be porous, non-uniform in consistency and
weak. Therefore, concrete must be consoli-
dated to attain acceptable results. The most
widely used method for concrete consolida-
tion is vibration and for slip form paving this is
accomplished by an internal vibrator.
The hydraulic oil must be filtered to maintain
proper operation and to prevent wear and
damage due to contaminates.
Oil pressure varies depending on oil tempera-
ture, flow rate, oil viscosity and the amount of
hose connected between manifold and vi-
brator. A vibrator in good condition operates
with a pressure of 700…1200 psi at 4 gpm and
140°F.
The hydraulic oil temperature should be main-
tained at 100…180° F with 140° F being opti-
mum.
Oil Filtration
Oil pressure
Temperature
∆ Before Each use, ALWAYS check the equip-
ment to make certain that there are no
damaged parts and that all parts function
properly. If any damage or malfunctioning
parts are found, have them repaired or
replaced by an authorized service facility.
∆ ALWAYS store equipment properly when
it is not being used. Equipment should be
stored in a clean, dry location out of reach
of children and unauthorized personnel.
∆ Use only factory authorized replacement
parts.