I-120
GH Pump 120 – 16.02.EN
27
4. Install gland (17) on shaft (6), slide back
towards slinger (40).
5. Install casing (1) to bearing frame (19) or motor
(200), clamping bracket (131A) with capscrew
(601).
6. Lubricate outside of shaft sleeve (14) to
facilitate mounting of mechanical seal (90).
Install mechanical seal rotating elements on
shaft sleeve.
7. Coat shaft sleeve (14) bore with DOW 111 and
install shaft sleeve over O-ring (89) onto shaft
(6).
8. Slide gland (17) with stationary elements of
mechanical seal (90) onto studs (630) and
secure finger tight with gland hex nuts (615) and
washers (645). As applicable, ensure tap flush
lines in gland (17) is positioned so flush lines
can be connected.
9. Reassemble pump per Section XI, Paragraph D,
steps 15 through 28.
G. REPLACEMENT OF OPTIONAL WEAR RING ON
PUMP EQUIPPED WITH ENCLOSED IMPELLER. If
your pump is equipped with an enclosed impeller, it may
have an optional, replaceable wear rings (7 and 7X) in
the suction cover (9) or backhead (11). If your pump is
equipped with the optional wear rings (7 and 7X), use
the following instructions, Table 8 and Figure 6 for wear
ring replacement.
NOTE
Stainless fitted and all iron pumps are not fitted
with a separate wear ring when new from the
factory. Stainless fitted and all iron pumps
when rebuilt can use separate wear rings to
restore wearing surface in the backhead or
suction cover.
The clearance between the wear rings (7 and 7X) and
impeller (2) hub will increase with wear. Internal leakage
will result and pump performance will decrease.
Table 8. Impeller/Wear Ring Matching Materials
All Iron & Stainless Fitted
To replace the wear ring, follow the disassembly
procedures in Paragraphs A and B of this section to the
point where the backhead or suction cover has been
removed and the wear ring is accessible. Once the wear
ring is accessible, use the following procedures:
1. Remove wear ring (7) from suction cover (9).
This can best be accomplished on a lathe.
2. Inspect impeller (2) hub for damage.
3. Press new wear ring (7) into suction cover (9).
Beveled edge of wear ring (7) is installed toward
impeller (2).
4. Place impeller (2) on an arbor and mount
between centers in a lathe or a grinder. Indicate
back of impeller (2) hub to within 0.002 T.I.R.
maximum to be sure arbor and impeller (2) are
running square.
5. Turn wearing surface of impeller (2) until a 63
RMS or better finish is obtained.
6. Measure outside diameter of front impeller (2)
hub and record the value.
7. Mount suction cover (9) with new wear ring (7)
installed in a lathe. Indicate male rabbet to
within 0.002 T.I.R. maximum.
8. Bore wear ring (7) to within specified tolerance
(listed in Table 6) over recorded size of outside
diameter of front impeller (2) hub.
CAUTION
Use removable thread locker when installing
impeller capscrew.
H. MOTOR. The motor should be maintained in
accordance with the manufacturer’s instructions.
I. CHECK VALVE. If applicable, the check valve
should be maintained in accordance with the
manufacturer’s instructions.
XII. PARTS LISTS AND DRAWINGS.
This section contains listings of parts and corresponding
drawings. Table 9 notes the recommended spare parts
for this pumping unit. Refer to Figures 9 and 10, for the
location of parts identified by item numbers.
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