In part 1 of Vacuum Truck Operation, we learned how to start the truck, open all relief valves, plug in the remote pendant (optional), close all vacuum relief valves, increase RPM’s to the desired level, and begin vacuuming debris or material.
Vacuuming can continue until the debris body capacity is reached. When this occurs, all vacuum operations must stop until the vacuum truck has been properly dumped.
Take caution when vacuuming dry material. Carry-over material can travel through the blower/fan. Running the blower/fan too fast with light material can carry the material into the blower fan. This will cause excessive and premature wear on the truck.
When performing liquid vacuuming operations, the float ball level indicator or the change in the sound of the blower (the float ball will get sucked up) will indicate a full tank and time to stop vacuuming.
In order to check the level of solid debris in the tank, do the following:
- Open all vacuum relief valves
- Reduce the blower RPM
- Open the inspection door at the rear of the debris body
The level of debris can be checked by looking in the tank through the opening behind the inspection door. Use a flashlight to get a clearer view of the content level.
If the debris body is full, vacuuming operations must be stopped immediately.
- Remove the vacuum hose from the work area and allow it to continue sucking air to allow any material left in the hose to travel into the tank.
- Open the vacuum relief valves.
- Reduce the RPM to idling.
- Disengage the blower by following the blower shut down procedure.
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