Grundfos NK B Istruzioni operative

GRUNDFOS

ILLUSTRATED SERVICE INSTRUCTIONS

Model B

PAGE

Content

Mounting of shaft ......................................................................................................................... 3

Assembly of mechanical shaft seal............................................................................................... 5

Assembly of stuffing box .............................................................................................................. 7

Assembly of impeller and pump housing ................................................................................... 9

Alignment of pump and motor shafts........................................................................................ 13

Mounting of shaft

1 2

Tools and auxiliary materials

for assembly

Fit circlip in bearing housing

3 4

Turn around bearing housing

Fit shaft with bearings into bearing

housing

5 6

Tap lightly with a soft-headed hammer

Fit second circlip

7 8

Fit ball bearing cover

Lubricate thrower with soapy water

and fit it on shaft

910

Mount second ball bearing cover

at other end

Lubricate second thrower with soapy water

and fit it on shaft

Assembly of mechanical

shaft seal

1 2

Lubricate seat and O-ring for stationary

part of seal with soapy water

Fit stationary seal in its seat

in cover for pump housing

3 4

Press seal firmly into bottom position

with a soft tool

Mount cover for pump housing on

bearing housing

5 6

Keep drain hole for shaft seal downwards

Tighten nuts

7 8

Fit protecting sleeve on shaft

Lubricate rotating part of shaft seal

with soapy water

910

Press shaft seal into bottom position

Fit impeller spacer on shaft

Assembly of stuffing box

1 2

Fit O-ring on shaft

Fit sleeve on shaft

3 4

Parts for stuffing box

Fit first stuffing box packing in bottom

position in cover for pump housing

5 6

Fit lantern ring in cover for pump housing

Fit the last three packings,

openings displaced 90° on all four

7 8

Fit studs in cover for pump housing

Fit the two gland halves

910

Fit nuts loosely

Mount cover for pump housing on bearing

housing, keeping drainhole downwards

Assembly of impeller and

pump housing

1 2

Fit impeller key on shaft

Fit impeller

3 4

Fit washer

Fit spring washer

5 6

Tighten impeller nut

Lubricate O-ring for pump housing and

cover for pump housing with soapy water

7 8

Fit O-ring on cover for pump housing

Mount pump housing on

cover for pump housing

910

Tighten nuts

Apply Loctite to plugs

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