TEST OR INSPECTION
Air pressure is checked by disconnecting air lines at eductor valve and observing air
pressure escaping from air line, when eductor control valve is activated. Air will escape
from the blue air line when FOAM SYSTEM switch is positioned to ON position and
escape from red air line when FOAM SYSTEM switch is positioned to OFF position.
System air pressure may drop below 85 psi (586 kPa) during this procedure.
Disconnect red and blue air lines from eductor valve. While an assistant puts cab or
pump operator's panel FOAM SYSTEM switch to ON and OFF position (WP 0004),
check if air pressure is present at eductor valve.
If there is air pressure, replace eductor valve (WP 0287).