Grundfos NK B Operating instructions

GRUNDFOS
ILLUSTRATED SERVICE INSTRUCTIONS
NK
Model B

2
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

3
Mounting of shaft
1 2
Tools and auxiliary materials
for assembly
1
Fit circlip in bearing housing
2
3 4
Turn around bearing housing
3
Fit shaft with bearings into bearing
housing
4

4
5 6
Tap lightly with a soft-headed hammer
5
Fit second circlip
6
7 8
Fit ball bearing cover
7
Lubricate thrower with soapy water
and fit it on shaft
8
910
Mount second ball bearing cover
at other end
9
Lubricate second thrower with soapy water
and fit it on shaft
10

5
Assembly of mechanical
shaft seal
1 2
Lubricate seat and O-ring for stationary
part of seal with soapy water
1
Fit stationary seal in its seat
in cover for pump housing
2
3 4
Press seal firmly into bottom position
with a soft tool
3
Mount cover for pump housing on
bearing housing
4

6
5 6
Keep drain hole for shaft seal downwards
5
Tighten nuts
6
7 8
Fit protecting sleeve on shaft
7
Lubricate rotating part of shaft seal
with soapy water
8
910
Press shaft seal into bottom position
9
Fit impeller spacer on shaft
10

7
Assembly of stuffing box
1 2
Fit O-ring on shaft
1
Fit sleeve on shaft
2
3 4
Parts for stuffing box
3
Fit first stuffing box packing in bottom
position in cover for pump housing
4

8
5 6
Fit lantern ring in cover for pump housing
5
Fit the last three packings,
openings displaced 90° on all four
6
7 8
Fit studs in cover for pump housing
7
Fit the two gland halves
8
910
Fit nuts loosely
9
Mount cover for pump housing on bearing
housing, keeping drainhole downwards
10

9
Assembly of impeller and
pump housing
1 2
Fit impeller key on shaft
1
Fit impeller
2
3 4
Fit washer
3
Fit spring washer
4

10
5 6
Tighten impeller nut
5
Lubricate O-ring for pump housing and
cover for pump housing with soapy water
6
7 8
Fit O-ring on cover for pump housing
7
Mount pump housing on
cover for pump housing
8
910
Tighten nuts
9
Apply Loctite to plugs
10