Bearing And Seal Replacement - Goulds Pumps 3935 Installation, Operation And Maintenance Instructions

16. Install O-rings (412K) on the discharge head (152) and diffusers with approximate spacing
17. Slide casing (100) over assembly and screw onto casing adapter (108). O-rings should be
18. Screw discharge head (152) into casing (100).
19. Replace pump foot (131). Tighten cap screw (371U) finger-tight. Tighten after start-up
20. Lay pump in horizontal position. Place a heavy bar or pipe through the bearing frame to
21. Plug unused opening in seal housing. Openings are required only for special seals. Refer
22. Bolt motor to frame (228 or 228A). For NEMA 444 TCS and 445 TCS motors, an adapter is
23. Pump is now ready for reinstallation. Follow applicable installation, lubrication and start-up

Bearing and seal replacement

1. Bearing Replacement
2. Mechanical Seal Replacement
Model 3935 Installation, Operation and Maintenance Instructions
shaft. Add shims as necessary under the last spacer (157) until end of spacer covers
approximately ½ of shaft retaining ring groove. Enter the shaft retaining ring over the shaft
and press it down until it snaps in the groove.
of every 16 stages for BP20 and every 8 stages for BP40 thru 200.
lubricated to aid in assembly.
when pump has reached operating temperature.
hold frame. Do not allow bar to contact stub shaft. The discharge head must be tightened to
the following minimum torque values:
BP20
BP40, 70, 100, 200 series
NOTICE: Operation of pump without proper torque on discharge head (152) can result in
damage to the pump.
to seal drawing for special seals and flushing or cooling requirements.
supplied.
procedures.
a) Lock out power and remove motor from pump.
b) Support liquid end and remove the bearing frame assembly from the pump by removing
cap screws (371L).
c) Follow instructions for the appropriate bearing frame for removal and replacement of
bearings (See Disassembly of pump
11).
a) Lock out power and remove motor from pump. Remove bearing frame assembly from
pump by removing cap screws (371L).
b) Access to seal is obtained by removing seal housing (159) and the stationary seat
mount (158). Seal (383A) will then slide off shaft.
c) Slide new rotary unit over splined end of pump shaft (122) and against retaining ring
(361D). Use care to avoid cutting rubber bellows on spline teeth. On BP20 pumps, the
seal shoulders against the step in the shaft. When reassembling unit, be sure O-rings
(412L) are not cut and that they are seated securely.
400 ft-lbs.
600 ft-lbs.
(page 10) and Reassembly of power end
Disassembly and reassembly
542 newton-metres
813 newton-metres
(page
15