Goulds Pumps 3498 - IOM - Manual (Page 47)

12. Remove gland plates (107) at both ends. Be careful not
to damage the static seal ring which is mounted inside
the gland plate. Refer to mechanical seal supplier’s
drawing and instructions for details.
13. Before removing the rotating assembly of mechanical
seal, note and mark its axial position on shaft sleeve.
For mechanical seal to work properly, installation
distance from the face of stuffing box is important. See
mechanical seal drawing for dimension. Remove
mechanical seals.
14. Remove sleeve nuts (124 & 130) using a proper “C”
wrench. Watch for LEFT HAND thread on one of
them. Hand of the thread is decided by shaft rotation,
refer to Pump Assembly Pix drawing. For CCW
rotation (124) is RH thread, (130) is LH thread. For
CW rotation (130) is LH thread, (124) is RH thread.
15. Remove outboard sleeves and keys from each end. To
remove the impeller and the inboard sleeves, hold the
shaft vertically and allow it to drop on a block of wood
a number of times. The weight of the impeller will
force it and the shaft sleeves off. If this does not work,
apply a light press. Before removing impeller, record
Dimension “A” from impeller hub face to thrust
bearing shoulder (see Fig. 14) to facilitate assembly.
16. Wear Rings
!
The impeller and wear ring clearance setting
procedures must be followed. Improperly setting the
clearance or not following any of the proper
procedures can result in sparks, unexpected heat
generation, and equipment damage.
When the rings are worn to twice the original
clearance, they should be replaced. The rings on the
impeller can be cut in two with a cold chisel and
removed. Heat each new impeller wear ring to 270° -
300°F and slide it onto the impeller. Hold rings against
the impeller shoulder until they cool.
ASSEMBLY
(Refer to Pump Assembly Pix Drawing)
1. All O-rings, seals, and gaskets should be replaced with
new parts during assembly. All reusable parts should
be cleaned of all foreign matter before reassembling.
The main casing joint gasket should be made using the
upper half as a template. Lay the gasket material on the
casing joint and mark it by pressing it against the edges
of the casing. Trim the gasket so that it is flush with
the inside edges of casing.
2. Install impeller key on shaft. Using Dimension “A”
recorded when dismantling, (See Fig. 14) install
impeller on shaft.
3. Install spacer sleeves, O-rings, stuffing-box sleeves,
and shaft sleeve nuts. Install mechanical seals on shaft.
4. Install casing rings (See Fig. 15).
5. Install bearing seals (333A & 332A) and bearing
endplates onto shaft.
6. Install thrust bearing (410) on shaft complete with lock
washer and locknut (382 & 136).
7. Install radial bearing (168).
8. Install pump coupling half and key per coupling
supplier’s instructions.
9. Assembly rotating element in lower half casing.
Locate casing rings over pins in lower half casing.
10. Bolt down bearing housings caps.
11. Lower upper half casing in place and locate using the
taper dowels. Install casing main joint studs/nuts.
Torque uniformly the casing main studs/nuts according
to the torque valves as indicated on the respective
Section Assembly Pix drawing.
12. Rotate shaft by hand to assure that it turns smoothly
and is free from rubbing and binding.
13. Tighten mechanical seal glands (107).
14. Install coupling, check alignment to driver and correct
if necessary.
44
3498 IOM 12/04
Fig. 15