Xylem IMDWT R02 Model DWT Deep Well Turbine Pumps - Manual (Page 25)

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INSPECTIoN ANd rEASSEMBLY
INSPECTION AND REPLACEMENT
1. Clean all pump parts thoroughly with a suitable
cleaner.
2. Check bearing retainers for deformation and wear.
3. Check shafts for straightness and excessive wear on
bearing surfaces. Average total runout should be less
than 0.0005” TIR per foot, not to exceed 0.005”
T.I.R. for every 10 feet of shafting.
4. Visually check impellers and bowls for cracks and
pitting. Check all bowl bearings for excessive wear
and corrosion.
5. Replace all badly worn or damaged parts with new
parts. In addition, replace all gaskets and packing as
required.
TURBINE BOWL WEAR RING INSTALLATION
Place chamfered face of the bowl or impeller wear ring
towards the ring seat and press the ring into the seat. Use
an arbor press or equal, making sure the ring is flush with
the edge or the wear ring seat.
INSTALL BOWL AND LINESHAFT BEARING
(Refer to Figure 1 for components numbers)
1. Press bearing (653) into retainer (652) using an
arbor press or equal.
2. Press bearing (690) into suction bowl/bell (688) hub
using an arbor press or equal. The top of the bearing
should protrude above the suction hub equal to the
depth of the counter bore in the sand collar.
3. Place the bowl (670) with the flange downward and
press bearing (672) through chamfered side of bowl
hub until the bearing is flush with the hub by using
an arbor press or equal.
REASSEMBLY THE BOWL ASSEMBLY OF
TAPERLOCK CONSTRUCTION
1. For ease in reassembly apply a thin film of turbine
oil to all mating and threaded parts. Be sure the
shaft has been cleaned and checked for straightness.
2. If the sand collar is not assembled to the shaft,
install the sand collar. The sand collar is attached
to the shaft with a shrink fit. The larger diameter
of the counterbore of the sand collar goes toward
the suction bell bearing. Heat the sand collar until
it slips over the shaft and quickly position it so that
the bottom of the sand collar is set according to the
“X” dimension, before it cools. See Figure 13. See
Table 1 for the “X” dimensions. Slide the plain end
of the pump shaft into the suction bowl/bell bearing
until the sand collar rests against the suction bowl/
bell hub.
Wear protective gloves and use
appropriate eye protection to prevent
injury when handling hot parts.
Figure 14
TABLE 1 Sand Collar Location dimension
Pump Model “X” dim. Pump Model “X” dim.
5C, 5T
1.88" 11A, 11RA 5.31"
5RWA 1.81" 11C 4.88"
6A, 6RA 3.13" 11WA 5.13"
6C 2.25" 12C 5.31"
6DH 3.50" 12DH, 12FD 5.19"
7A, 7RA 3.13" 12FR 6.50"
7C, 7T, 7WA 2.81" 12WA, 12RA 5.00"
8A, 8RA 3.13" 12RJ 4.94"
8DH 4.44" 13A, 13RA 7.19"
8RJ 2.88" 13C 5.13"
9A, 9RA 3.41" 14DH 8.13"
9RC, 9T, 9WA 5.19" 14F, 14H,14RH 7.13"
10A, 10RA 4.31" 14RJ 5.06"
10DH 6.31" 15F Bowl 9.50"
10L 6.25" 16B 6.56"
10RJ 5.00" 16DH Bowl 8.63"
10WA 5.19" 16DM 5.88"
16RG 6.69"
3. Hold the shaft in this position by inserting a long
capscrew (or all thread rod with a hex nut) with an
assembly jig into the bottom end of the suction hub
and secure tight into the threaded hole at the end
of the shaft. Be sure the shaft has been cleaned and
checked for straightness.
4. Slide the first impeller over the shaft until it seats on
the suction bowl/bell.
5. Insert a screwdriver into the slot in the taperlock
(677) spread the slot and slide the taperlock over
the pump shaft. Hold the impeller against bowl and
slide the taperlock into the impeller hub. Be sure the
taperlocks have been cleaned and are dry.
WARNING
X