TEST OR INSPECTION
Ensure system air pressure is at least 85 psi (586 kPa) during this procedure. System air
pressure is required to activate valves.
Do not engage water pump engine during this procedure, except when performing
complete system checks. Valve operations can be checked without water pump
Valve operations can be checked by observing valve shaft rotation. Valves are open when
tabs or yellow paint tabs are aligned with direction of fluid flow.
Open pump house panel A (WP 0539). While an assistant puts and holds pump
operator's panel FOAM TANK switch to "A" position (WP 0004), check if foam A shutoff
valve operates to open position.
If foam A shutoff valve operates to open position, repair wire 2842 (red) in
main wire harness if repairable (TM 9-2320-325-14&P), or replace main wire
harness (WP 0455).