Goulds Pumps 3355 - IOM - Manual (Page 39)

Maintenance
Drain the pump
CAUTION:
• Allow all system and pump components to cool before you handle them to prevent physical injury.
1. Close the isolation valves on the suction and discharge sides of the pump.
You must drain the system if no valves are installed.
2. Open the drain valve.
Do not proceed until liquid stops coming out of the drain valve. If liquid continues to flow
from the drain valve, the isolation valves are not sealing properly and you must repair them
before you proceed.
3. Drain the liquid from the piping and flush the pump if it is necessary.
4. Disconnect all auxiliary piping and tubing.
5. Remove the coupling guard.
6. Disconnect the coupling.
7. Unbolt the pump from the piping system and the baseplate.
Prepare for disassembly
WARNING:
Make sure that the unit cannot roll or fall over and injure people or damage property.
Before you begin, refer to the appropriate sectional drawing for either the radial suction or end
suction configuration.
1. If you plan to disassemble the entire pump for maintenance work, place the pump in a
vertical position with the suction nozzle facing up.
A workbench with a hole that is approximately 0.50 in. (1.27 cm) larger than the shaft is
helpful in such cases.
2. For pump sizes 1.5 x 2.5-7 and 2.5 x 4-8, place the pump on the coupling guard adapter
(234A).
3. For pump sizes 4 x 5-10 and 5 x 6-11, stand the pump vertically with an additional support.
You must also have a hoist or a second person for disassembly.
Disassemble the discharge end ball bearing for the radial suction
configuration
1. Remove the coupling halves.
2. Remove the flinger guards (499) if applicable.
3. Place the pump in a horizontal position.
4. Raise the discharge casing (100D) with wooden blocks so that the feet of the bearing
bracket (228C) are exposed by approximately 0.50 in. (1.27 cm).
5. Move back the thrower (248) or heat flinger (123B) if applicable.
6. Unscrew the nuts (425 and 427H) and then pull the bearing cover (119) off the bearing
bracket (228C).
7. Remove the bearing bracket (228C) by tapping the bearing flange lightly in an axial
direction.
After the bearing bracket (228C) has been removed, you can freely move the shaft in an
axial direction approximately 1/8 in. (0.30 cm). Standard shaft seals can absorb this
adjustment without their function being impaired. In the case of special shaft seals, follow
the operating instructions of the seal.
8. Unscrew the shaft nut (136A) with a spanner wrench. The shaft nut has a securing device
that prevents it from coming loose.
Model 3355 Installation, Operation, and Maintenance Manual 37