Goulds Pumps 3420 - IOM - Manual (Page 58)

LDS, XL, and XXL Group
1. Oil Lubrication: Loosen the set screw (364) in the
dust cover (123A) on the coupling end and slide it
towards the coupling.
Grease Lubrication: Slide the deflector (332) on the
coupling end toward the coupling.
(See Step 15 for optional labyrinth seals).
2. Remove the bearing cap hex nuts (425A) and the
bearing cap (111). Match-mark each bearing cap.
They must be replaced on the same end and in the
same position on the pump during reassembly.
$
CAUTION
Failure to reassemble the pump with the bearing caps in
the correct position could result in damage to the pump.
NOTE: The casing and the bearing caps are machined
as a matched set.
3. Place the sling in position, refer to Fig. 33. Adjust the
sling tension to take weight off of the rotating
element. Make sure all stationary parts of the rotating
element are loose before the rotating element is
removed. It is desirable to rotate the casing wearing
rings (127), stuffing box bushings (125), and the
bearing housings (134 and 134A or 134A and 134D)
180
° to disengage the tongue and groove locks.
4. Remove the element and place it on padded supports.
5. Slide both casing rings off the rotating element.
6. Scribe the coupling position on the shaft (item 122)
and remove the coupling and the coupling key (400).
7. Oil Lubrication: Slide the dust cover (123A) off of
the coucpling end of the shaft.
(See Step 15 for optional labyrinthh seals).
Grease Lubrication: Slide the deflector (332) off of
the cou;ing end of the shaft.
8. Unbolt and remove both bearing end covers (109A
and 119A).
9. Oil Lubrication: Remove the oil rings (114).
10. Straighten the tangs in the lockwashers (382) and
remove both bearing locknuts (136) and lockwashers.
11. Oil Lubrication: Slide the oil ring sleeves (324 and
323) off of the shaft (122).
Grease Lubrication: Remove the grease shield (346A)
and the oil ring sleeves (207 and 208).
12. To remove the bearings (409 and 410), refer the
instruction in Section 5.
13. Slide the bearing housings and the inboard bearing end
covers (109B and 119B) off of the shaft. If desired, at
this time, the inboard bearing end covers can be
removed from the bearing housings in order to replace
the end cover to housing gasket (360N or 360B).
14. Oil Lubrication: Loosen the set screws (364) in the
oil throwers (248) and slide the oil throwers off of the
shaft.
Grease Lubrication: Slide the deflectors (333) off of
the shaft.
(See Step 15 for optional laby seals).
15. With labyrinth seal option (332 Opt, 333 Opt), see
Paragraphs 8, 9, 12 for SX/MX Group bearing
housing disassembly.
DISASSEMBLY OF THE ROTATING
ELEMENT
1. Conventional Mechanical Seals: Slide the gland,
with the stationary seats in place, off of the shaft. Use
care to prevent damage to the seal faces.
Cartridge Mechanical Seals: Slide the mechanical
seal (383) off of the shaft.
Packed Stuffing Box: Slide the glands (107) off of
the shaft. Remove the packing (106), lantern rings
(105), and stuffing box bushings (125).
2. Loosen the set screws (222B) in the sleeve nuts (124).
Using a spanner or strap wrench, remove the sleeve
nuts. Discard the sleeve O-rings (497).
NOTE: One sleeve has right hand threads and one has left
hand threads. The nuts tighten against the pump’s rotation.
3. Smoothe the shaft (122) with a fine emery cloth so
that the sleeves will not bind upon removal.
4. Carefully slide the sleeves (126) off of the shaft.
Discard the impeller O-rings (412A).
NOTE: If the pump has conventional mechanical
seals, the sleeves will still have the stuffing box
bushings and the rotary elements of the mechanical
seals still mounted.
5. Lightly scribe a line on the shaft at the impeller hub
(101). This will determine the proper position of the
impeller on the shaft for reassembly.
6. Press or drive the impeller off of the shaft.
s
! WARNING
Do not damage the impeller hub surface. This is an
O-ring sealing surface. Damage to the hub surface
could result in a failed seal. A failed seal could result
in serious physical injury.
7. Remove the impeller key (178).
54
3420 IOM 8/09