Goulds Pumps 3355 - IOM - Manual (Page 41)

Maintenance
Preassembly inspections
Replacement guidelines
Inspection
Clean and check the condition of all parts that have been removed. In case of doubt, replace
components. You must always replace wearing parts, such as ball bearings, and seals.
Mechanical seal location
Mechanical seals are located on the suction side for the (RS configuration and the discharge
side for the RS and ES configurations.
Shaft sleeve location
Shaft sleeves (104 and 126) and the mechanical seals (383S and 383) are separate
components. Mark the position of these parts so that you can mount them in the same position
during reassembly.
Reassembly
Prepare for reassembly
1. Clean all components and remove any rust.
2. For the RS configuration, screw in and secure the throttling element (252) on the suction
casing (100F).
3. For the RS configuration, provide a bore that is 0.16 in. (0.41 cm) in diameter in order to
ventilate the sealing chamber.
This bore must always be located in the top position. Depending on the location of the
suction casing nozzle, use one of the three cast depressions for this drilled hole.
4. Screw in the stud bolts (356A).
5. ES? Screw in and secure the throttling element (252) (use correct bore) to the discharge
casing (100D).
6. Screw in the stud bolts (356A).
7. Hammer in the pin (445E) of the seal cover (184).
8. Screw in the stud bolts (356C) on the bearing bracket (228C).
9. Screw in the lubricating nipple (193B) of the bearing cover (119).
10. For the ES configuration, press in the bearing bushing (197A) of the intermediate bearing
housing (134C).
11. Clamp the shaft in a vertical position (122) using soft protective wedges. Make sure that the
coupling end points upwards.
Reassemble the shaft seal
CAUTION:Placing the pump in a vertical position is required for assembly.
1. Always use a lubricant when mounting mechanical seals. Do not use mineral grease or oil if
you are not absolutely certain that it is compatible with the O-ring material.
2. Insert the seat ring of the mechanical seal (383 & 383S) in the seal cover (184). Slide the
rotating unit of the mechanical seal (383 and 383S) onto the shaft sleeve (104 and 126)
and secure with set screw (if required).
3. Slide on the O-ring (412F) and apply a lubricating agent, such as silicon grease, using a
brush.
4. Lubricate the shaft sleeve (104 and 126) on the I.D. so that the O-ring groove remains
clean (start approximately ½” inside).
Model 3355 Installation, Operation, and Maintenance Manual 39