Goulds Pumps 3355 - IOM - Manual (Page 44)

Maintenance
2. Mount the intermediate bearing housing (134C) with the bearing bushing (197A) as for
stage casing.
3. Mount the first stage of the pump and then secure the impeller (101) with a washer (199)
and nuts (304).
4. Tighten the first nut (304) securely.
5. Turn the nut back a one-quarter turn and secure it with a counter nut.
6. Mount the suction casing (100F) with an O-ring (412K) and assemble the tie rod (356S) and
nuts (357F) together slightly.
7. Align the bearing surface of the pump feet and place the pump on a flat surface.
8. Tighten the nuts (357F). See the torque values table.
9. Rotate the shaft (122) in order to verify that it turns freely.
Reassemble the discharge end ball bearings for the radial suction
configuration
1. Clean and lubricate the fitting surfaces between the bearing bracket (228C) and the
discharge casing (110D).
2. Preheat the new bearing (409) to a maximum of 230°F (110°C) and slide it onto the shaft
(122).
The variants are:
• Sizes 1.5 x 2.5-7 and 2.5 x 4-8: Roller bearing (409), double row angular ball bearings
(single bearing)
• Sizes 4 x 5-10 and 5 x 6-11: Roller bearing (409), paired angular ball bearings in back-
to-back arrangement
3. Tighten the shaft nut (136A) while the bearing is still hot.
4. After the bearing cools down, pack the bearing completely with grease making sure that
grease gets under the cage.
When the pump is started the bearing will run hot for several minutes until the excess
grease is purged. It will then return to a normal operating temperature. When the bearing is
installed in the bearing housing, the cavities on either side should be filled with grease for
about 1/3 of the volume.
5. Fit the bearing bracket (228C) and screw it on lightly for the time being.
6. Screw the bearing cover (119) to the bearing bracket (228C).
7. Grease the contact surface of the thrower (248) and bring the thrower or heat flinger (123B)
into position on the spacer sleeve (157).
The thrower sits in a groove on the spacer sleeve. Make sure that the heat flinger blades
are positioned approximately 0.75 in. (1.91 cm) from the bearing cover studs (356C).
8. Align the surfaces of the pump feet. Make sure that the pump is on an even surface.
9. Lay the discharge casing (100D) horizontally so that the shaft can be inserted (122).
10. Place the pre-mounted unit on the discharge casing (100D) and tighten the nuts (425)
firmly. See the Torque values table.
11. Rotate the shaft (122) in order to make sure that it turns freely.
12. Mount the coupling half. You might need to preheat to a maximum of 230°F (110°C).
42 Model 3355 Installation, Operation, and Maintenance Manual