Figure 3-14. Air Shutoff Valve.
(4) Close the four draincocks and four vents, but leave the drain valve open (fig. 3-12 and 3-13).
If it is necessary to flush the liquid admix systems, refer to para 3-8 b, then repeat
steps 1 thru 4
b. Empty the Aggregate Bins. This prevents moist aggregates from freezing into chunks in the bins.
(1) Lift the locking arm on the cement clutch (fig. 3-15). Pull the clutch lever to the right to disengage the clutch.
(2) Loosen the stopscrews on the sand and stone controls (fig. 3-16). Turn the handwheels clockwise as far as
they will go. Tighten the stopscrews.