Goulds Pumps 3996, Installation, Operation And Maintenance Instructions

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REASSEMBLY
This procedure covers reassembly of pump after complete
disassembly. Make sure all directions in Inspection and
Replacement section have been followed. Refer to Figure
17 for applicable item number.
1. Oil bearing seat on coupling end of shaft (122). Slide
coupling end bearing (112) (double row) on shaft as
far as possibly by hand. Place pipe or driving sleeve
over shaft, making sure it rests against inner race
only. Make sure bearing is “square” on shaft,
especially where it contacts the grease seal.
2. Place lockwasher (382) and bearing locknut (136) on
shaft and tighten firmly. Bend “tang” of lockwasher
into slot in locknut.
3. Slide bearing housing (134) with O-ring (496) in
place, on shaft and over bearing as far as possible.
Do not damage grease seal (332).
4. Insert retaining ring (361) into groove in bearing
housing (134). Flat side of retaining ring must be
against bearing.
5. Oil inboard bearing seat on shaft (122). Slide
inboard ball bearing (168) on shaft as far as possible
by hand. Place pipe or driving sleeve over shaft,
making sure it rests against inner race only. Make
sure bearing is “square” on shaft. Tap or press
evenly until bearing is seated firmly against the shaft
shoulder. Do not mar the shaft, especially where it
contacts the grease seal.
6. Place a small amount of O-ring lubricant on inside of
bearing frame (228) at bearing housing (134) and
inboard bearing seats, on O-ring, and on inboard
grease seal (333). Carefully slide shaft assembly into
the bearing frame as far as possible. Do not damage
inboard grease seal. Be sure O-ring (496) is in place
in groove on housing. Screw bearing housing bolts
(370C) about ½” (12 mm) into bearing frame.
7. Slide deflector (123) on shaft (122).
8. If unit has stuffing box packing:
Place stuffing box cover (184) against frame making
sure that the studs (370H) align with proper holes in
frame. Replace nuts and firmly tighten. Slide sleeve
(126) if any, on shaft (122). Make sure groove in end
of sleeve engages drive pin (496D) on shaft.
9.
If unit has mechanical seal (383):
The following instructions refer to pumps equipped
with mechanical seals, either with or without sleeves.
On units with sleeves, the rotary portion of the seal
may be mounted on the sleeve, and the seal-sleeve
assembly mounted on the shaft as a unit.
Before mounting any seals, wipe the seal faces
carefully with a clean soft cloth and lubricate with
clean oil.
A preliminary impeller adjustment must be
performed to assure proper positioning of the
mechanical seal.
a. Position sleeve (126) if any, on shaft (122) and
engage groove in sleeve with drive pin (469) on
shaft. Place stuffing box cover (184) against
frame (228). Make sure studs (370H) align with
proper holes in frame. Firmly tighten nuts or
bolts.
b. Screw impeller (101) with O-ring (412A) in
place on shaft. Make sure that shaft assembly
extends through stuffing box cover (184) so that
the impeller will NOT contact face of stuffing
box cover.
c. Using impeller adjusting bolts (370C & 370D),
adjust the impeller clearance until a .020” (0.51
mm) feeler gauge can be inserted between the
back of the impeller and the face of the stuffing
box cover.
d. Remove impeller (101) and stuffing box cover
(184).
The following instructions are for three basic seal
types: Inside, Outside, and Double Seals. Refer to
seal manufacturer’s drawing to determine seal type
and positioning dimension. Follow the pertinent
procedures.
Single Inside Seal
1. Assemble the gland (250), gaskets and stationary
seat. If unit has sleeve (126), position sleeve on
shaft (122). Slide gland assembly on shaft or
sleeve.
2. Refer to Section V-D for instructions on proper
positioning of mechanical seals.
3. Place stuffing box cover (184) against frame
(228) making sure that studs (370H) align with
proper holes in frame. Replace nuts and firmly
tighten. Do not allow stuffing box cover to
contact shaft, sleeves, if any, or mechanical seal.
4. Refer to Step 10 for further instructions.
Outside Seal
1. If unit has shaft sleeve (126), slide on
shaft (122).
2. Lubricate rotary portion of seal and slide on
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3996 IOM 9/2010