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Chapter 14 Miscellaneous Equipment
Mobile Concrete Mixer Plant - 14081_385

Equipment Operator Basic - Beginning construction equipment operators manual
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preferably round-bottomed, and large enough to guard against  overflow  (fig.  14-2). The   maximum   or   minimum   slope   should   be determined   by   the   condition   of   the   concrete   as discharged from the chute. Quality control personnel on  the  jobsite  should  provide  guidance  in  this  area. When possible, you should install a downpipe on the end of the chute to help keep the concrete from segregating when coming off the end of the chute. OPERATION Be sure to read the operator’s manual for the type of  concrete  mixer  you  are  operating. Give special attention  to  the  following: 3. Check the water tank and meter valves of the on-board water system for the following: operating condition, clean tank, and all valves are clear. Cleaning Give special care to cleaning the transit mixer. At the beginning of each workday, the mixer should be coated with form oil to prevent cement and concrete from sticking to the paint or bare metal. After the load of  concrete  is  discharged  from  the  mixer,  the  operator should wash off all excess concrete in the mixer drum and  blades,  the  discharge  chute  opening,  and  the discharge  chute  before  it  has  a  chance  to  harden. Spraying 15 to 25 gallons of water into the drum while it is rotating will clean the inside of the drum as well as remove all grout which may have collected in the water nozzle during discharge. A washdown hose is provided on the mixer to clean areas accessible from the outside. 1. Ensure the chain drip oiler is filled and turned on  at  the  beginning  of  operation. CAUTION 2. Check the oil level in the hydrostatic drive unit Consult  your  supervisor  about  any at the sight glass. environmental   regulations   that   require Figure 14-2.-Chutes used for discharging concrete. 14-2







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