Maintenance
Model 3410 Installation, Operation, and Maintenance Manual
66
Group
Pump size
Iron and bronze
Steel
XL
10 x 12-12H
10 x 12-15
0.0055–0.0075 in.
(0.014–0.019 mm)
0.010–0.012 in.
(0.025–0.030 mm)
12 x 14-15
0.0065–0.0085 in.
(0.017–0.022 mm)
0.011–0.013 in.
(0.028–0.033 mm)
Reassembly
Install the impeller
CAUTION:
Check for magnetism on the pump shaft and demagnetize the shaft if there is any
detectable magnetism. Magnetism attracts ferritic objects to the impeller, seal, and bearings
which can result in excessive heat generation, sparks, and premature failure.
NOTICE:
The impeller and wear-ring clearance setting procedures must be followed. Improperly
setting the clearance or not following any of the proper procedures can result in sparks,
unexpected heat generation, and equipment damage.
1. Insert the key (178) into the shaft (122).
2. Determine the correct positioning of the impeller (101) on the shaft (122).
Facing the coupling-end of shaft, determine the proper rotation of the unit.
3. For S group pumps, install the retaining ring (361H) in the inboard (coupling-end) retaining
groove.
4. Slide the impeller (101) on the shaft and drive the impeller flush with the retaining ring
(361H).
5. If you are reinstalling the shaft and impeller, then line up the impeller hub with the mark
made on the shaft during disassembly.
6. Install the shaft sleeve.
Pump group
Instructions
S
1.
Install the retaining ring so that the tapered side is facing the outboard
end of the shaft.
The inward pressure asserted by the double taper automatically centers
the impeller and eliminates lateral play.
The outboard (thrust-end) retaining ring groove and retaining ring (361H)
are tapered.
2.
If the pump does not use the optional sleeve, then you are finished. If the
pump uses the optional sleeve, then continue to complete the following
steps.
3.
Make sure that the shaft is free of dirt, grease, and bonding compounds.
4.
Apply a thin coat of Loctite 635 or equivalent to the shaft sleeve area and
the inside of the sleeve.
5.
Slide the sleeve on the outboard end of the shaft and seat the sleeve
firmly against the shaft shoulder.
M, L, XL
1.
Place the sleeve-to-impeller gasket (428) on the impeller (101).
Make sure that the gasket is aligned with the key (178).
2.
Slide the sleeve (126) onto the shaft.
3.
Slide the O-rings (497) onto the shaft by stretching them over the
threaded end.
4.
Using a spanner or strap wrench to tighten the sleeve nuts (124),
adjusting the impeller to approximate center.
Do not tighten the setscrew. You will need to adjust the impeller again
when the rotating element is placed in the casing.
7. Position the casing wear rings (103) on the impeller.
Make sure that the anti-rotation pins (445A) are seated firmly.
