Step 11. Pump the tank unit full of water to the desired level. Remove the hopper-blender cover.
Observe the water level on the tank liquid level indicator to see that it is satisfactory. Refill the prime-
detergent tank with water. Replace the cover and lid.
The tank now contains the desired quantity of water for spraying equipment, showering personnel, or
Learning Event 2
PUMP WATER FROM A NATURAL WATER SOURCE WITHOUT LOADING THE TANK
Situations will arise in which you will be required to pump water from a natural water source using the
M12A1 PDDA, without filling the tank. Such a requirement would occur when large numbers of
vehicles are to be washed.
To pump water from a natural water source without filling the tank, perform the before-operation checks
end services described in Lesson 2, Learning Event 1. Next, follow the same procedures (Steps 1 thru
10) specified in Learning Event 1 of this lesson as if you were loading the tank with water drawn from a
natural water source; all steps are the same except that in Step 3 the protective cap from the upper
discharge connector should not be removed and the blender hose should not be connected to the upper
discharge hose connector on the pump unit and the agitator connector on the tank unit. (Since the tank is
being bypassed there is no need to make these connections. Water will instead be discharged through
valves 2 and 3 to the reel assembly plumbing and then to the discharge hoses.) When you have started
the engine, proceed through the following steps.
Step 1. Adjust the throttle to idling speed until you are ready for spraying.
Step 2. Connect the gun assemblies to the upper and lower reel hoses as described in Lesson 1,
Learning Event 1.
Step 3. Be sure the pump is still primed. Open
the pump drain valve briefly. If the pump is
primed, water will exit the drain valve under
pressure and the pressure gage will show a
reading of between 60 and 120 psi. Close the
pump drain valve.
Step 4. Prepare for spraying by opening either
or both valves 2 and/or 3. Open valve 2 to spray
with the lower reel hose, valve 3 to spray with
Figure 30. Open ball valve.
the upper reel hose, both to use both hoses.