Goulds Pumps 3640 - IOM - Manual (Page 73)

Maintenance
b) Chill the new bushing (125, 125A) using dry ice or other suitable chilling substance, and
install the bushing into the fit of the case (100) and head (184).
Be prepared to tap the bushing in place with a hardwood block or soft-faced hammer.
WARNING:
Dry ice and other chilling substances can cause physical injury. Contact the supplier for information and
advice for proper handling precautions and procedures.
c) Tack weld the bushing in place at three equidistant places.
Replace the wear rings
The casing and head wear rings (164, 164A), impeller wear rings (142, 144), and spacer
bushing (206) are held in place by a press fit and three setscrews (320).
1. Remove the wear rings:
a) Remove the setscrews.
b) Remove the wear rings from the casing (100), the impeller (101), and the head (184).
Use suitable pry or puller tools to force the rings from the fits.
You can also machine the rings for removal.
CAUTION:
Excessive machining can damage ring fits and render parts unusable.
c) Remove the spacer bushing (206) from the casing spacer (443D).
2. Install the wear rings:
a) Thoroughly clean the wear-ring seats, and make sure that they are smooth and free of
scratches.
b) Heat the new impeller wear rings to 180°F–200°F (132°C–143°C) using a uniform
method for heating, such as an oven, and place them on the impeller (101, 145) wear-
ring seats.
WARNING:
Wear insulated gloves when you handle rings. Rings will be hot and can cause physical injury.
Model 3640 Installation, Operation, and Maintenance Manual 71