Goulds Pumps 3393 - IOM - Manual (Page 83)

Maintenance
NOTICE:The impeller and wear ring clearance setting procedure 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.
3. Check the suction casing and diffuser wear rings (103) runout and distortion by measuring
the bore at three (3) locations 120
O apart with inside micrometers or vernier calipers.
Replace the impeller wear rings (Optional - may not be on all pumps)
Impeller wear rings are an option. A press fit and three tack welds hold the impeller wear rings
(142) in place.
1. Remove the impeller wear rings (142) by grinding out the tack welds and using suitable pry
or puller tools to force the wear rings from the impeller. If this is impractical, the wear rings may
be ground off.
2. Clean the impeller hubs thoroughly to make sure they are smooth and free of scratches
3. Heat the new impeller wear rings to between 180
O F (82 O C) and 200 O F (93 O C) using a
uniform method for heating, such as an oven, and place them on the impeller (101) hub in the
correct location..
4. Tack weld each ring in three places 120
O apart.
Note: It may be necessary to replace the impellers.
Reassembly
Preliminary work
WARNING:
Make sure that the unit cannot roll or fall over and injure people or damage property.
Ensure that there is adequate space to safely work on the pump. Make sure pump is stable and
secured from tipping over. Insure all parts are available and that any parts being reused are
clean and dry.
Assembly of suction end bearing
End suction pump - item 117 (sleeve bearing)
Do not reuse 505D (tolerance ring) or 412K (o-ring).
1. Clean the fitting surfaces between the bearing sleeve (197A) and suction casing (100S).
2. Coat the casing bearing bore and the outside of the stationary bearing (197A) with Loctite
635
3. Insert bearing sleeve (197A) into the casing. This can be facilitated by placing the bearing
sleeve in a freezer for approximately one hour and heating the suction casing with hot
water. When the casing has been heated, insert the bearing sleeve into the casing bore.
The greater the temperature difference between the bore and the sleeve, the easier it will
be to insert the bearing sleeve. An assembly fixture that can aid in this portion of the
assembly can be made or can be purchased from Goulds.
4. Replace tolerance rings (505D) and sleeve bearing (117) on the end of the shaft
5. Replace cap screw (469Y) and retaining plate (467) on the end of the shaft.
6. Place o-ring (412K) in position on the diffuser.
7. Replace suction casing (100S) and align with the shaft.
8. Reinstall tie rod nuts (357F) and tie rod washers (437A) on tie rods and tighten to correct
torque values as noted in Appendix A. Tighten in sequence and increments as noted in
Appendix D.
Model 3393 Installation, Operation, and Maintenance Manual 81