CONCRETE MIXER MOD.: PO 500
GB
Operating maintenance, spare parts manual Rèv. 3 del 12/10/18
Pagina 21 di 40
the material will fall down!
Follow the safety instructions shown in chapter SAFETY PRECAUTIONS
.
Before carrying out maintenance or replacing the components, cut off the power supply.
7.2 Working cycle
Before starting the operation cycle, carry out the following checks/operations:
After the machine has been tooled, the electric and hydraulic system connected and the operator equipped
with the protection equipment (work gloves, safety shoes, ear muffs, dust mask):
Prepare sufficient aggregate and cement in the work area of the concrete mixer;
Start the bucket positioning the drum in vertical position; Put about half the quantity of water needed for mixing into the drum;
Load the bucket with the desired quantity of aggregate and cement; Move the lever of the distributor to raise the bucket and
to discharge the material into the drum; Put the necessary water quantity into the drum; Make the bucket come down to
prepare a new load. Place a crane bucket or a similar container in front of the drum for the mixed concrete;
After mixing of the materials, overturn the drum to unload the material. When unloaded, move the drum in vertical position
After the first mixing, the operator shall repeat the above mentioned instructions and adjust the quantity of components
according to the obtained and the desired product quality;
At the end of work, the operator shall wash the drum inside and the machine outside, stop the machine, disconnect the
electric system and carry out maintenance works. The work shall be done by a single operator.
DISCONNECTING
To disconnect the electric system, press the stop push-button and extract the electric plug.
Follow the safety instructions shown in chapter SAFETY PRECAUTIONS.
In case of activation of the emergency devices, the machine will immediately stop. The machine stops in case
of excessive current absorption and/or incorrect supply voltage.
7.3
Safety precautions
The dangerous areas of the machine are those near the bucket and the drum.
Never introduce objects or your hands inside the protections, while the machine is running.
Do not introduce or stock foreign materials inside the machine, on the protections and on the operating
elements. Pay special attention to high temperature elements (electric motor and hydraulic unit).
Insulating the machine
Before carrying out any operation on the machine (installation, maintenance, replacement
of components, placing, repair, etc.) insulate the machine as follows:
Stop the machine; Cut off electric supply; Make sure the machine is powerless and the complete lack of residual
energies: temperatures, bucket on the ground. Only one operator shall be responsible for the execution of all
these operations. ALWAYS USE THE PROTECTIVE EQUIPMENT DURING INSTALLATION, OPERATION AND
MAINTENANCE OF THE MACHINE: WORK GLOVES, SAFETY SHOES, EAR MUFFS, AND MASKS.
On-site
Ensure sufficient lightening and space for maintenance works and the moving around of the personnel.
Always clean the ground, because dust, water, etc. make the ground become slippery and dangerous.
Wear tight-fitting clothing. Do not wear any jewellery or clothing that can get caught.
Always use the protective equipment.
On the machine, before starting the work
Make sure the motor cooling grating is chipless and free of any dirt.
The concrete mixers are equipped with a magneto-thermal switch with minimum voltage release coil.
In case the supply voltage does not comply with the specifications or after a short-time cutoff , the minimum voltage coilwill
automatically cut off the supply voltage. In such a case you must press the start push-button to restart the machine.
The motor is equipped with an overload protection; the motor stops in case of overheating.
The motor is protected from inopportune starts after cutoff
.
ALL MAINTENANCE AND ASSEMBLING OPERATIONS MUST BE DONE, AFTER HAVING DISCONNECTED THE
POWER SUPPLY TO THE MACHINE.
The machine shall be kept turned off when it is not used. Always carry out a work cycle without material to check good
operation. Ensure the machine devices and the area in front of the drum are proper and free of obstacles.
Ensure all the safety devices, control devices and work devices are well positioned.
During operation Use the prescribed protective equipment.
Never approach the moving and operating elements
with your hands, arms or other parts of your body. Remove rubble with an appropriate device and always with the machine
stopped:
never use your hands!
In case of machine trouble, never work with the machine running, wait for complete
machine stop and finish the work cycle or stop immediately the machine. During the operation of the machine, of its elements
or of its accessories, it is strictly forbidden to remove any protection, like cases, barriers or other protection and safety
elements. Never modify switches or other safety and/or operating cycle control devices, because such an intervention could
seriously damage the mechanical elements of the machine and injure the health of the operator. Pay attention to the
operating and the moving parts. Do not climb or position yourself on or inside the machine. In case of machine trouble, stop
the machine with the emergency push-button and cut off the electric energy supply until the trouble has been eliminated.
It is forbidden to climb or sit on the machine.
During maintenance Before carrying out any maintenance work, insulate the machine as described at the
beginning of this chapter
. In case of mechanical or electrical troubles, get in touch with the authorised personnel.
If the machine is out of service because of troubles, maintenance or repair works, place a sign and padlock the main switch.
Always use the protective equipment during repair and replacement of the machine elements.
All electric operations must be done by experienced and authorised personnel.
