1. Aggregate Scale Calibration
Check the initial feeder calibration prior to starting.
If it has not been set previously, enter the feeder rate of 50 tons per hour onto the monitor for
Set the control gates on the feeders to a five inch opening.
This puts the feed rate for calibration purposes at an approximate value suitable for calibrating
the aggregate scale.
Weight the truck to be used. Follow the instructions regarding truck weighing that appear in
Inspect the feed conveyor.
Verify that all pulleys and return rolls are clean and free from materiel build up.
Inspect the belt to see that it is clean and free from materiel build up.
Remove build up from on any of these components prior to beginning calibration.
Check the belt to see that it is trained and running centered on the pulleys and idlers.
If not, train belt prior to calibrating.
Inspect counter weight on gravity take-up. Remove any materiel build up prior to calibration.
Feeder panel-select DIVERT on the Auto/Divert/Drum selector switch.
Motor control panel-select BYPASS on the Drum Interlock selector switch.
Feeder panel-press START on the Feed Conveyor button. This belt should run for at least fifteen
(15) minutes prior to calibrating.
Back a truck up to the bypass chute on the drum mixer (the extension to the chute must be
installed if not already in place).
Place the deflector gate so that the aggregate falling into the chute is directed into the truck box.
(Be prepared to shovel the materiel from the back of the truck box to the front if necessary.)