Sundyne LMV-313, Instruction And Operation Manual

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Instruction and Operation Manual
29
Pump Assembly and Clearance Adjustments
General Clearance Adjustment
Information
If disassembly of the wet-end is only for minor
maintenance such as a seal change, the original
shims should still be satisfactory. If any of the
major components listed below have been
replaced, changes to the original shimming will
be necessary.
•
Gearbox
•
Seal housing
•
Diffuser
•
Pump case
Impeller Spacer Adjustments
Before proceeding, the gearbox should be fully
assembled. The seal housing (30) and the
thermal barrier gasket (87A) must be installed
also. The diffuser cover (15) and process
mechanical seals as well as all associated o-
rings can be temporarily left off during this
procedure.
Position the exit flow path from the impeller
within the opening of the diffuser annulus by
changing the thickness of the impeller spacer
(158C). Make this adjustment with the thrust of
the output shaft away from the gearbox.
Position the gearbox vertically with the output
shaft up. Install the following components of the
rotating assembly as well as the original impeller
spacer (158C).
•
Shaft sleeves
•
Rotating faces
•
Impeller
There are two methods for setting the impeller to
the diffuser. Both methods require the use of a
shaft loading tool. See Shaft Loading Tool
Installation figure for how to install the shaft
loading tool.
Method 1
Use a dial indicator and surface gauge to
measure dimensions “A” and “B” from the
Impeller Shim Adjustment figure. Record the
readings. Use a depth micrometer to measure
dimensions “C” and “D”. Compare “B” to “C” and
“A” to “D”. Select the spacer thickness that will
place the parts within tolerances for the position
specified in the Impeller Shim Adjustment figure.
Note: Some diffuser openings are much wider
than the impeller openings. The primary
tolerance is the 0.025 ± .020 inch
(0.635 ± 0.508 mm) setting. The
diffuser opening must not overlap the
impeller opening.
Method 2
If the proper tools for measuring dimensions of
“A” and “B” are not available, use this method.
Measure the dimensions for “C” and “D” and
transfer these dimensions to a template. Do this
by scribing position marks to indicate the diffuser
opening. Place the straight edge of the template
on the seal housing and visually adjust the
impeller opening to the scribe marks. To do this
it is necessary to leave the diffuser cover (15)
off. Otherwise it is necessary to put a notch in
the template. An example of a transfer template
can be seen in the Shaft Loading Tool
Installation figure.
After completing either of the two methods,
remove the shaft loading tool. Assemble the
following parts:
•
Process mechanical seals
•
O-rings
•
Shaft sleeves
•
Seal rotating faces
•
Diffuser cover
•
Impeller spacer
•
Impeller
Inducer Housing Shim Adjustments
Reinstall the bolt from the shaft loading tool and
torque the impeller.
Remove the inducer housing (6) and shims
(158F) from the diffuser (13).
Place the diffuser (13) over the impeller allowing
it to rest on the seal housing surface. Make sure
that both surfaces are clean. If using a tapered
inducer, install o-ring (936A) and the diffuser
screws (906F). When using a straight inducer,
leave out o-ring (936A) temporarily.