29
IMPERIAL TRUCK MOUNTED VACUUM TANKER MANUAL
disassembly.
Changing rotor vanes includes the following general steps:
1. Drain and remove the oil tank from the pump.
2. Remove the oil pump (Note: on some pumps the
oil pump and mounting fl ange may be removed
as one unit - see your OEM instructions).
. Remove the oil pump mounting fl ange or housing.
★
IMPORTANT: The rotor bearings will usually
remained pressed into the mounting fl ange upon
removal. Be careful when pulling the bearings free
of the rotor shaft that the rotor does not fall down
inside the pump housing. It may be necessary to
provide a means of support for the rotor, such as
a block of wood under the rotor shaft.
4. Remove the end plate from the pump.
5. Remove old vanes and replace with new vanes
that have been dipped in oil.
★
IMPORTANT: Always replace vanes in sets.
6. Before reassembling, inspect the rotor bore, bearings,
seals, and gaskets, and replace as necessary. Seals
should be soft and pliable, gaskets should not be
of the rotor.
4. Place a scriber mark on the rod at the level of the
plug tap-hole.
5. Next, manually turn the rotor so that the blunt
point of the measuring rod drops into one of the
rotor slots. Make another mark on the measuring
rod at the level of the tap-hole, and then measure
the difference between the two marks on the rod.
The difference between the two marks on
the measuring rod can be up to ¼” before the
rotor vanes must be replaced (Figure 4.12).
6. After checking the vane wear, replace the plug in
the checking port and tighten it.
★
IMPORTANT: Be sure to replace the plug in the
vane wear checking port after performing a check.
Failure to replace the plug will result in lower pump
vacuum and suction capacity of the tank.
Replacing Rotor Vanes
When changing the rotor vanes in your vacuum
pump, follow the specific instructions in your
OEM pump manual. This is essential because the
procedure for changing vanes varies based on the
pump design and the manufacturer.
The procedure outlined below provides a general
overview of the process of replacing vanes.
If you are replacing rotor vanes with the pump
mounted to the truck, use the appropriate safety
precautions as outlined below and in the safety
section of this manual beginning on page 5.
DANGER
:
Stop the truck motor, remove all
persons from the truck cab, and chock the truck
tires before servicing any component under
the truck; this includes changing rotor vanes.
Contact with a rotating mechanism can cause
entanglement that can lead to death. A truck
that begins to roll is a crushing hazard that can
lead to death.
WARNING: Wear protective gloves, eye
protection, and appropriate clothing when working
with sewage effl uent or septage. These materials
may contain hazardous chemicals, disposed of
through the drain, which can cause severe injury
or even death due to contact. These effl uents also
contain bacteria that can be a source of infection,
especially if exposed to open cuts or sores.
★
IMPORTANT: When replacing rotor vanes, be
sure to have replacement gaskets, O-rings, and
seals on hand in case any of these items should
need replacing and/or be damaged during
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