I-120
GH Pump 120 ā 16.02.EN
24
NOTE
For a cartridge seal, refer to mechanical seal
vendor instructions for proper seal installation
procedure.
11. If applicable, install cartridge mechanical seal
(*90). DO NOT remove seal clip until after pump
assembly is complete.
12. For units with packing (*180), install the packing
retaining ring (*63) into the backcover (11).
Install the lantern ring (*29) on the shaft sleeve
(14) sliding the lantern ring back near the slinger
(40).
13. As applicable, install the mechanical seal
spacer (*68) or packing retaining ring (*63) onto
shaft sleeve (14).
14. Install sleeve gasket (73).
15. Install O-ring (89) on backcover (11).
16. Install backcover (11) on motor adaptor (*71)
and secure with capscrews (601).
CAUTION
During steps 17 through 21b, use old impeller
capscrew (26) to secure impeller (2 or 3). Once
proper impeller clearance is achieved, use a
new impeller capscrew (26) to secure impeller.
During assembly, install new impeller capscrew
(26) with locktite.
NOTE
Impeller gasket installation is critical to Dry
Shaft design. Insufficient gasket thickness may
allow liquid to access the end of the shaft.
Excessive gasket thickness may allow liquid
ingress to shaft area behind the impeller. DO
NOT reuse PTFE gaskets.
17. Install impeller key (32). Coat impeller (2 or 3)
bore with DOW 111 and install impeller. Install
impeller washer gasket(s) (73X) in impeller bore
over the end of the shaft (*6), combining
thicknesses and quantities, as required, so the
outer most gasket face protrudes from the
impeller bore by approximately .02 to .04 inches
when the impeller/sleeve/gasket are lightly
compressed. Install impeller capscrew O-ring
(89C) and impeller washer (28) on impeller
capscrew (26). Install and properly torque
impeller capscrew (26).
CAUTION
Use a two-man lift or suitable lifting device to lift
pumping unit, motor, or assemblies.
18. Install casing (1) to backcover (11) with
capscrews (600).
19. Using appropriate leveling tools, level casing.
Torque capscrews (601), (605), and (600), refer
to Table 5.
NOTE
On pumps equipped with a closed impeller,
omit steps 20 through 21d. Steps 20 through
21d are procedures that describe impeller
clearance adjustment for semi-open impellers
only.
20. Install suction cover (9 or 10) to casing (1). DO
NOT install suction cover gasket (73A).
21. There must be a clearance of 0.010 inches
minimum and 0.020 inches maximum between
open impeller (3) and suction cover (9 or 10). To
check clearance, rotate shaft by hand and listen
for any rubbing noise.
If rubbing noises are present, the clearance
between impeller and suction cover is less than
0.010 inches. To remedy this:
a. Remove capscrews (611) and suction
cover (9 or 10).
b. Install new suction cover gasket (73A)
on suction cover (9 or 10).
c. Install suction cover (9 or 10), securing
with capscrews (611).
d. Recheck the clearance and repeat the
above steps as necessary to correct the
clearance between the impeller (3) and
the suction cover (9 or 10) and there is
no more rubbing. The maximum
number of suction cover gaskets (73A)
to be used is 5. Consult with the factory
if more than 5 are needed.
22. After proper clearance is achieved make sure
that the suction cover (9 or 10) is installed with
the vent hole to the top and tighten capscrews
(611).
23. Complete mechanical seal (*90) or packing
(*180) installation. As applicable, ensure tap
flush lines in gland (*17) is positioned so flush
lines can be connected. Install gland on studs
(630) and evenly tighten gland hex nuts (615)
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