6.
Slide rotary unit of mechanical seal (383A) over splined end of pump shaft (122) and against retain-
ing ring (361D). Use care to avoid cutting rubber bellows on spline teeth. On BP20 pumps, the me-
chanical seal shoulders against the step in shaft.
7.
With bearing frame assembly in the vertical position, bolt casing adapter (108) to seal housing
(159). Install O-ring (421K).
8.
Slide splined end of pump shaft (122) into splined insert of stub shaft (380).
9.
Install impeller key (178) in shaft (122).
10. Install back washer (546) on all impellers.
11. Install the suction diffuser (151) on the casing adapter (108). Be sure suction diffuser and casing
adapter fits are clean and that the diffuser is free to turn in the casting adapter fit.
NOTICE:
Suction diffusers (150) on the BP20, BP40, BP70 and BP100 pumps are different than the oth-
er diffusers in each pump. In BP200 pumps, all diffusers are the same.
12. Install first stage impeller (201) on shaft (122). First stage impeller on the BP20 and 200 are the
same as other impellers in pump. First stage impellers on BP40, BP70, and BP100 are different
than other impellers in pump.
13. Set dial indicator as shown in
Dial indicator
figure. Hold first stage impeller and shaft firmly in place
and move suction diffuser up and down. The amount of movement as read on the dial indicator is
the
Front Clearance
for this impeller. Add or subtract shims as necessary to obtain the required
Front Clearance
. Required
Front Clearances
are listed in
Impeller Stack Clearance
tables.
7.6 Reassembly of liquid end
Model 3935 Installation, Operation and Maintenance Instructions
21
Содержание GOULDS PUMPS 3935
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