TM 5-3825-229-14&P
2-21. GRAVITY DRAINING OF TANK
WARNING
Do not stand in the path of water when removing the protective cap from the suction line.
Personal injury could occur from the force of water.
a.
To drain tank without using pump, remove drain plug from line between suction valve and tank.
b.
Remove drain plug from bottom of pump case.
c.
Install drain plug in line between suction valve and tank when all water has drained.
d.
Install drain plug in bottom of pump case.
2-22. PUMPING OUT DISCHARGE HOSE WITHOUT TRUCK-TRACTOR CONNECTED
The solenoid-actuated valves that control the flow of water to the spray nozzles rely on air pressure to keep the valves
closed during pumping operations not involving the spray nozzles. This air pressure is obtained from the air brake
system when a truck-tractor is connected to the semitrailer. It is also possible to operate the water distributor without a
truck-tractor connected. If necessary to pump water out the discharge hose when a truck-tractor is not readily available
(for emergency firefighting or other uses), the four small manual valves must all be turned 1/4 turn (900) as shown.
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