Goulds Pumps 3640 - IOM - Manual (Page 83)

Maintenance
NOTICE:
Make sure that the expulsion port is at the 6 o'clock position and is properly seated.
2. Place the inboard oil rings (114) on the shaft.
3. Assemble the thrust bearings (112A) in a back-to-back arrangement onto the shaft (122):
The bearings are interference fit.
a) Preheat the bearings to 250°F (120°C) with an induction-type bearing heater.
Be sure to also demagnetize the bearings after heating.
CAUTION:
• Wear insulated gloves when you use a bearing heater. Bearings get hot and can cause physical
injury.
NOTICE:
Do not use a torch and do not force.
b) Install the bearings (112A), the oil ring sleeve (443B), and the bearing locknut (136)
onto the shaft.
c) While the bearings are hot, tighten the locknut by hand with a spanner wrench until the
bearing is snug against the shaft shoulder.
d) Allow the bearing assembly to cool slowly to room temperature.
Do not rapidly cool the bearings with compressed air or other means.
e) When the bearing assembly is fully cooled, remove the locknut, install the lockwasher
(382), and install the locknut.
f) Hand-tighten the locknut with a spanner wrench. Do not over-tighten the bearing. Tap
the end of the spanner wrench with light strikes from a dead blow hammer while you
note the location of the next available lockwasher tab that aligns with the slots in the
locknut.
The turning resistance of the nut increases as it tightens. Plan the alignment of the
lockwasher tab with the locknut fully tightened. If the locknut is still turning with light
strikes with the hammer, then continue to tighten the locknut until the next available tab
is aligned with a slot. Do not use heavy strikes with the hammer. If it is not possible to
reach the next tab, then loosen the locknut to align with the previous tab.
g) Check the condition of the outer races by rotating the bearings by hand in opposite
directions:
• The outer races generally cannot be counter-rotated by hand, but if they do move,
the resistance must be high.
• If the outer races are loose, the bearing is not properly seated and must be
retightened.
h) When you have achieved the proper bearing assembly, set the lockwasher tab in the
slot in the locknut.
4. Lift the lower half of the bearing housing (134A) into place, positioning the two inboard oil
rings (323) in the bearing housing grooves.
5. Place the installed inboard labyrinth seal (333A) in the lower housing.
6. Finger tighten the lower housing to the head-bearing flange with the head-to-bearing
housing studs (371T) and nuts (427J).
7. Install the sleeve bearing (117):
a) Place the lower half of the sleeve bearing (117) onto the shaft (122) and slide it around
the shaft into the lower bearing housing, moving the oil rings accordingly. Position the
inboard oil rings (323) in the grooves on the sleeve bearings.
Model 3640 Installation, Operation, and Maintenance Manual 81