Goulds Pumps 3393 - IOM - Manual (Page 64)

Maintenance
To dismantle the whole pump for maintenance work, place it in a vertical position with the
suction nozzle facing upwards. It is important that the pump is secured and stable and
supported without damaging the bearing housing. A workbench with a hole approximately 1/2”
larger than the shaft is helpful in such cases. A hoist or a second person is required for a safe
disassembly.
WARNING:
Make sure that the unit cannot roll or fall over and injure people or damage property.
NOTICE:
The pump must be dismantled and assembled in the vertical position.
1. Loosen tie rod nuts (357F) at both ends and remove tie rods (356J). Note: the tie rods are
threaded into the discharge casing and must be removed by unscrewing the tie rods using
the flats machined into their surface.
2. Remove suction casing (100S) and remove o-ring (412K).
It is not recommended to remove the product lube bearing unless worn or damaged.
3. Loosen retaining ring set screw (352F) and remove the retaining ring (361H) and split ring
(214B).
4. Remove impeller (101), impeller key (178), stage casings (100G) and final stage casing
(100H) along with stage casing o-rings (412K) and discharge casing o-ring (497D). This
step must be done stage by stage down to the discharge casing (100D). Do not reuse o-
rings.
5. Invert the pump so the bearing housing (228C) faces upward position.
6. Remove seal guards (499).
7. Remove cooling fan (392) by loosening set screw (222V) if applicable.
8. Disconnect any flush piping from the mechanical seal gland.
9. Unscrew nuts (425) and back off the bearing bracket (228C) using the jacking screw (418).
10. Unscrew capscrews (371C) and confirm that the bearing housing cover (119) is free to
move.
11. Remove bearing bracket (228C).
IMPORTANT: After the bearing bracket (228C) has been removed, the shaft can be moved
freely in an axial direction approximately 1/8”. Standard shaft seals can absorb this
adjustment without their function being impaired. For special shaft seals, follow the
Operating Instructions of the seal.
12. Remove the bearing housing cover o-ring (412). Do not reuse the o-ring.
13. Bend back the lock washer tab (382) and remove the bearing nut (136A) and the lock
washer (382).
14. Remove ball bearings (409) with the bearing puller.
15. Remove the mechanical seal and gland as noted in the instructions for removal of the
mechanical seal.
16. Remove the seal chamber (184) and seal chamber o-ring (412H) from the discharge
casing (100D).
Pull the housing toward the shaft end axially.
17. Remove cap screws (372H) that hold the balance drum locking plate (519) to the balance
drum (300).
18. Remove balance drum locking plate and balance drum locking plate key (178R).
19. Use a permanent marker to place an alignment mark on the shaft and balance drum.
20. Brace the shaft to prevent it from rotating. Insert threaded rods in the balance drum holes
and rotate the balance drum by 30º to clear the locking tabs on the shaft.
21. Remove balance drum and balance drum o-ring (412X) using the threaded rod. Do not
reuse balance drum o-ring.
62 Model 3393 Installation, Operation, and Maintenance Manual