52 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
52 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
52 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
Vertical Turbine Pumps
Repairs
Document Name: 2001299-VTP-IOM-EN Page 52 of 67
Revision 3 Copyright © 2014, Weir Floway, Inc. All Rights Reserved. Issue Date: December 12, 2014
8.10 Tension Nut Assembly and Adjustment
Enclosed lineshaft units use a tension nut which is at the top of the enclosing tube and must be tightened for
proper operation. Refer to Figure 8-3 for general construction.
1. Clean all O-ring sealing surfaces including the groove in the tension plate and oil lightly.
2. After assembling the discharge head to the column, install the tension plate (ensure that both O-rings
are in place), and allow the O-ring to slide down outside of tube adjusting nipple. Lightly oil the outside of
the tube adjusting nipple prior to installation of tension plate.
3. Bolt the tension plate into place.
4. Slide the tension nut over the shaft and thread into inside of the tube adjusting nipple (left hand threads)
until the tension nut is snug against the tension plate. Continue to tighten the tension nut until the
lockscrew slot lines up with the “first” tapped hole in tension plate (1/4 turn maximum).
5. Install the lockscrew and tighten.
6. Proceed to complete the installation.
Figure 8-3: Tension Nut Assembly
CAUTION
DO NOT OVER TIGHTEN THE TENSION NUT
It is necessary that the enclosing tube have tension on it which is accomplished by
tightening the tension nut. However, excess tightening can distort or break the tension nut.
Do not tighten more than 1/4 turn on close coupled pumps.
1
2
3
4
5
6
7
1. Headshaft
2. Lock Screw
3. Tension Plate
4. Tension Plate O-ring
5. Tube Adjusting Nipple
6. Tube Nipple O-ring
7. Tension Nut
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