F-1031, Section 4202
Page 6 of 10
Installing Undersize Wear Rings
Replacement rings are available as follows:
•
0.025 in. undersize
•
0.050 in. undersize
•
0.075 in. undersize
If inspection shows that the wear ring clearances are excessive or the im
peller hubs are scored or grooved, turn the impeller hub on a lathe to an
acceptable dimension.
Table 1 shows the original hub dimensions for each impeller and the re
work dimensions for each degree of undersize.
Flame plated impeller hub wear ring clearance is usually restored by
installing a replacement wear ring with the same dimensions as the origi
nal wear ring since most wear occurs on the wear ring, not the impeller
hub. Flame plated impellers are the numbers with the “T” suffix.
Table 1. Impeller and Wear Ring Repair Dimensions
Impeller Number
Original HUB Diameter
Original Wear Ring Number
Reworked HUB Diameter
New Wear Ring Number
7309-F
70690
4.623 / 4.621
61269
4.598 / 4.596
4.573 / 4.571
4.548 / 4.546
61269-25
61269-50
61269-75
70423
70689
5.5015 / 5.4995
61029
5.476 / 5.474
5.451 / 5.449
5.426 / 5.424
61029-25
61029-50
61029-75
71887
71899
5.500 / 5.498
62363
62364
5.492 / 5.494
5.467 / 5.469
5.442 / 5.444
62363-25
62363-50
62363-75
62364-25
62364-50
62364-75
Keep the hub diameters within 0.015 in. TIR of the impeller shaft bore. If
the impeller hubs do not clean up at first undersize dimension, turn the
hub down to the next degree of undersize. Replace the impeller if the hubs
do not clean up at the last undersize dimension.
Before pressing new wear rings in place, remove all corrosion from body
and head counterbores and apply a generous amount of lubriplate or simi
lar lubricant to the outer ring surfaces. With a suitable arbor, carefully
press the rings into the body and head counterbores. Make sure the rings
are seated firmly against the counterbore shoulders.
Reassembly
Reassembly of the CG and CGVG pumps is essentially the same as the
disassembly procedure, except it is reversed. Note that if undersize wear
rings are required, they should be installed during reassembly. Also, if a
new impeller is needed, install new standard size wear rings for the impel
ler.
Mechanical Seal
CAUTION
The mechanical seal primary and stationary rings are made of brittle ma
terial. The material can be cracked or chipped. Extra care must be taken
when handling these rings.
NOTE: If Waterous Mechanical Seal Lubricant part no. 52608 is
not available, P80 rubber lubricant, straight dish soap or glycerin
may be substituted.
1.
Install mechanical seal after volute body has been reattached to trans
mission.
