|
| |
TM 5-4210-233-14&P-1
Table 4-2 Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
FIREFIGHTING SYSTEM - Continued
14
DISCHARGE HOSE WON'T DE-PRESSURIZE
Check drain valve for blockage.
Clean dirt/blockage from drain hole.
15
NO FOAM DISCHARGE AT ANY NOZZLE
Step 1. Check if foam valve set OPEN.
Set foam valve to OPEN.
Step 2. Check if foam proportioning valve (in cab or on structural panel) closed.
Set foam proportioning valve to required percentage.
Step 3. Check if foam tank empty or content diluted.
Drain tank and/or refill tank as required.
16
EXCESS FOAM FROM NOZZLE
Check percentage setting on foam metering valve with chart.
Reset from metering valve. If condition continues, refer to Direct Support Maintenance.
17
FOAM ENTERING WATER TANK
Check if tank fill/recirculating valve is open or partially open.
Close valve.
18
WATER ENTERING FOAM TANK
Defective 1-1/2" check valve in foam system piping.
Replace 1-1/2" check valve (see para 4-37).
4-57
|
