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5. Install mechanical seal retaining ring (361D) on shaft (122) in groove near splined end. On
6. Slide rotary unit of mechanical seal (383A) over splined end of pump shaft (122) and
7. With bearing frame assembly in the vertical position, bolt casing adapter (108) to seal
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
12. Install first stage impeller (201) on shaft (122). First stage impeller on the BP20 and 200
13. Set dial indicator as shown in Dial indicator figure. Hold first stage impeller and shaft firmly
Model 3935 Installation, Operation and Maintenance Instructions
1. Drive sleeve
2. Split collet (524)
3. Mechanical seal retaining ring groove (BP40, 70, 100 and 200 only)
Figure 2: Drive collar and split collet installation
BP20 pumps only, this ring (361D) is not required as shaft has a retaining stepped
shoulder.
against retaining ring (361D). Use care to avoid cutting rubber bellows on spline teeth. On
BP20 pumps, the mechanical seal shoulders against the step in shaft.
housing (159). Install O-ring (421K).
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 other diffusers in each pump. In BP200 pumps, all diffusers are the same.
are the same as other impellers in pump. First stage impellers on BP40, BP70, and BP100
are different than other impellers in pump.
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.
Disassembly and reassembly
13
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