8. To drain tank under pressure, proceed as follows:
a. Open the drain valve (DISCHARGE) hydraulic control knob (figure 36, item 1).
b. Place hydraulic pump selector lever (figure 36, item 2) so it is pointing away from the pump
handle (figure 36, item 3).
Operate hydraulic hand pump (figure 36, item 3) until drain valve fully opens.
d. Place vacuum pump control handle (figure 36, item 4) in neutral position.
Figure 36. Hydraulic Valve Controls and Vacuum Pump Control
e. Ensure red emergency shutoff button (figure 37, item 1) on the control panel is pulled out.
Turn engine ignition key (figure 37, item 2) to the first position (between RUN and START) to
g. When preheat light (figure 37, item 3) goes out, start engine by placing key (figure 37, item 2)
momentarily on START position (figure 37, item 4) until engine starts (key will automatically
return to RUN (figure 37, item 5) position). Regulate engine idle speed to 850 RPM with throttle.
h. Regulate engine speed with throttle (figure 37, item 6). Set not to exceed 2200 RPM. (Operating
RPM range between 2200 to 2800).