10
Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
It is highly recommended that you resort to the diagram on page 6 to verify the assemblies and
subassemblies whose directions will follow.
1. LEG BRACKET ASSEMBLY
Sets of leg-brackets are optional and can be used to vertically adjust the pump. The size of the
brackets (
209
) and the legs (
207
) depend upon the NEMA or IEC of the motor. First, complete
the primary assembly of the legs and the brackets, using the hexagonal screws (
209A
) to tighten
the legs to the brackets. Next, use the hexagonal screws (
209B
) to tighten the brackets to the
motor (
210
). You may need to lift the motor to complete this part of the assembly.
2. ADAPTER ASSEMBLY
Place the stainless steel adapter on the motor and tighten using four hexagonal screws (
71B
)
with the torque values recommended on
Chart 1
The adapter should be accompanied by two adapter pins, which normally come preinstalled. If
not, insert them in the corresponding drilled holes. These pins serve to set the backplate (
11
) to
the adaptor (
71
), hooking the backplate onto the adapter pins using the two backplate pins (
11F
)
located on the backplate. Depending upon the pump model and seal type, some backplates
do not have pins for reasons of design. The adapter comes with a protective guard (
131
) which
comes attached by an hexagonal screw (
131A
). It is highly recommended for reasons of safety
not to operate the pump if this guard is not placed on the adapter.
3. SPACING OF THE IMPELLER AND STUB SHAFT
To set the stub shaft onto the motor, it is necessary to place it at the proper distance. To find this
position it is necessary to provide a spacing of seventy one-thousandths of an inch (0.070 in.)
between the impeller and the backplate, as shown in
Figure A.
You can make this adjustment using a caliper or spacing gage.
Depending on the pump model and the seal type, the backplate requires
two pins (
11F
), which serve to hold the backplate in place when mounted
on the adaptor.
The backplate pins should always be placed pointing in a counter-clockwise
direction so that the backplate does not slip. When handling the backplate
be careful not to damage the contact surface of the mechanical seal or the
front side of the backplate.
An explanation on how to place the stub shaft onto the motor follows up
next.
Chart 2
BEGINNING THE ASSEMBLY
ASSEMBL
Y