16
IMPERIAL TRUCK MOUNTED VACUUM TANKER MANUAL
★
IMPORTANT: After operating your pump at
high in./Hg vacuum levels, dry the pump interior
out using the procedure outlined above. Water in
your vacuum pump can cause sludge formation
and freeze up in cold weather.
Unloading
You have two options when unloading your tank,
gravity dumping or pressure dumping. Either
method will effectively empty the tank; however,
pressure dumping increases discharge fl ow rate.
Begin the unloading procedure by placing the
vacuum pump control handle into neutral to relieve
any vacuum in the system, then use one of the
following procedures.
For gravity dumping, use the following
procedure:
1. Set the control handle on the pump to the
“pressure” mode.
2. Open the dump valve.
For pressure dumping, use the following
procedure:
1. Set the control handle on the pump to the
“pressure” mode.
2. Engage the tractor PTO to start the pump, and run
up to the recommended RPM for your vacuum
pump model.
. Open the dump valve to begin unloading when
the pressure reaches the desired level (up to the
maximum psi set on the pressure relief valve).
OPERA
TION
WARNING: Do Not exceed the maximum
pressure of 15 psi with your vacuum tank.
Exceeding 15 psi pressure could cause the tank
to rupture, resulting in serious injury or death to
persons in the area.
After unloading the tank, disengage the PTO and
close the dump valve. It is important to disengage
the PTO before closing the valve to avoid pressure
buildup in the system.
Hydraulic Components
Imperial Truck Mounted Vacuum Tankers are
available with a variety of hydraulic operated and
driven components. Some of these components
include hydraulic hoists, hydraulic hatches, and
hydraulic pump drives.
Use the toggle switch mounted inside the truck
cab to actuate the hydraulic components on your
vacuum tanker, except for hoist cylinders.
On trucks with air brakes, use the air feathering
control lever mounted on the fl oor of the truck cab
to operate the hoist cylinder. On trucks without air
brakes, a feathering control cannot be installed.
These trucks use a non-feathering lever control to
activate the hoist cylinder.
Hoist Vacuum Tankers
Use the control lever mounted in the truck cab to
raise the tank for dumping sludge or other solids
from your hoist tanker. Before dumping the solids
from the tank, drain all liquid from the tank.
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