Goulds-pumps 3311 - IOM User Manual download pdf (Page 27)

7.4.3.2.6. Dismantling of hydraulic unit

Dismantle bearings in accordance with 7.4.3.2.3 a) or b)

Dismantle shaft seal in accordance with 7.4.3.2.4 a) or b)

Dismantle balancing device in accordance with 7.4.3.2.5

- Remove key 940.2

- Release nuts 920.1

- Remove tie bolts 905

- Support stage casing 108.1

- Remove delivery casing 107

- Remove, from stage to stage, impeller 230, key 940.1,

stage casing 180.1 with diffuser 171.1, in that order

7.5 Work after disassembly

- Clean all parts.

- Clean the clearances and sealing surfaces.

The following pump components, if existing, must be

checked:

Mechanical seal

If the running faces are damaged or worn, replace the

mechanical seal.

Clearances

The diameter difference between impeller clearance area

and casing or cover clearance area of a new pump is

between 0.3 and 0.6 mm, depending on size and material.

In the case of excessive wear in the clearance area, wear

rings must be installed.

Shaft

Carry out a concentricity check.

7.6 Assembly

CAUTION

• The assembly work must be based on good

engineering practice.

- Use no force.

- Heavy parts must be supported during assembly.

- Before assembly, apply a layer of an appropriate

erection substance on the fitting points. Observe

instructions with regard to cleanliness and safety.

- The properties of new pump components must not be

changed without our head office's consent.

- All parts must be clean and free from chips or dust.

- The unit may be re-assembled in the reverse manner to

disassembling.

- Observe the tightening torques specified.

- Quick-sticking glues are not permitted.

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Goulds-pumps 3311 - IOM User Manual Page 27

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