PRINCIPLES OF OPERATION 20
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION
CLEANING THE DEBRIS TANK:
Connect the handgun to the quick disconnect at the 1/2” hose reel. Engage the water pump. Increase
the engine RPM with the throttle until the water pressure reaches 800 PSI on the pressure gauge.
Do not exceed this pressure setting when operating. The handgun should also be used to flush the
cyclone and hopper.
HELPFUL HINTS FOR USING YOUR HYDROEXCAVATION UNIT
WATER LEVEL INDICATORS:
It is important to pay attention to the amount of water remaining in the fresh water tanks when using
the hose reel. There are two ways of determining the amount of water remaining:
1. The sight level tube located on the water tanks which shows water level in both tanks.
2. Low water warning light, will come on when there is approximately 3 minutes of operation time
remaining. (Optional)
COLD WEATHER STORAGE:
The following procedure is required to prevent damage to the water pump and water system during cold
weather conditions.
1. Open the drain in the water tank cross-over line, under truck chassis, behind the rear axle.
Leave the drain cap off until the machine is ready to be used.
2. Drain water from tanks by tipping the tank slightly. Once the water is removed, lower the tank.
3. Remove the suction line filter, gasket and cover.
4. Turn the 3 way ball valve at rear reel water manifold to the “Hose Reel” position.
5. Engage water pump in accordance with normal procedure and run pump approximately 15
seconds.
6. Apply 75 to 100 PSI of air pressure, from an external source, to the air valve on the water pump
to force the water from the water pump and hose reel. Do this until a solid stream of water no
longer comes out of hose.
7. Tie or wire the sewer cleaning hose end securely to reel and rotate clock-wise as if
retrieving the hose from sewer. Make certain the nozzle is removed. Rotate until water no
longer comes out.
8. Open valve for handgun and push ball on male quick connect.
9. If equipped with cold weather recirculation option, open the ball valve to drain the water
from the return line. Leave this valve open until ready to use again.
Caution!
The implementation of this procedure must be performed immediately
after hydro excavating operation or cold weather recirculation
operation.
Caution!
If general circumstances lead to the interruption of the procedure and
there is a presumption of ice formation in the system, move to the unit
to a heated garage immeadiately, let thaw out, and then proceed with
the
above
steps.
