Figure 21. Hydraulic Valve Controls
Figure 22. PVC Valve on Chopper Tube/Wand
18. Adjust engine speed, if necessary, to maintain vacuum during loading.
Ensure that chopper tube/wand remains submerged during loading process to
maintain vacuum. If vacuum drops below a level necessary to evacuate the waste
liquid, close the ball valve on the chopper tube/wand briefly to let the vacuum build
up before re-opening the valve.
By observing the float level indicator you can determine approximately when the
tank is full. When the tank is full, the primary shutoff valve will close and stop the
loading action. This will be noticeable by a drop in engine speed and a decrease of
vacuum indicated on the pressure/vacuum gage. The float level indicator will point
19. When the tank is full as shown on the float level indicator (figure 23, item 1), the primary shutoff
(figure 23, item 2) will stop the filling operation.