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Service Manual

Service Manual for NR 4...

Manufacturer: WILO EMU GmbH

Heimgartenstraße 1

95030 Hof / Germany

Phone: +49 9281 974-0

Fax: +49 9281 96528

eMail: info@wiloemu.de

Internet: www.wiloemu.com

1 Content1 Content 1

2 Foreword 1

3 Tools 1

4 Dismantle and assembly the submersible pump 1

Dismantling 2

Assembly 6

2 Foreword This manual includes information to observe during dismantling and remounting of the submersible motor.

Before dismantling or remounting this manual should be entirely read by the concerned and responsible mechanics and experts.

Use only water for dismounting and remounting, glycerine or sili-con milk as auxiliary lubricant. Oil and grease are restricted and may not be employed at any case.

Generally, in case of remounting the pump after check up or repair-ing maintenance replace (renew) seal rings.

3 Tools- steel pipe, outside Ø 20 mm, inside Ø 16 mm,

length abt. 350 mm- double head box wrench, size SW 12 x 13 mm- screw driver for cross head screw, size 2- deep offset double head box, size SW 20 x 22 mm- elbow pliers, size 1/2” with plastic insert- key for hexagon socket screws, size 6- vernier depth gauge, measuring range up to 80 mm

4 Dismantle and assembly the submersible pump

ATTENTION

Take care to avoid straining the electric cables

or otherwise damaging them during this work.

It is advisable to lay all parts down according

to the order of their dismantling. The pump

must be placed and secured on a stable

platform. Dismantling must follow exactly the

imagining as in the following pictures.

2

Dismantling

Loosen fixation screw at the cable protection Pull cable protection out of the flap and then remove it

Loosen nut M8 at the fixation strap Remove fixation nut

Pull out fixation strap Remove fixation strap from the slot in the discharge piece

1 2

3 4

5 6

3

Dismantling

Remove discharge piece Remove valve cone

Remove top diffuser Loosen nut of clamping sleeve - size of screw spanner 22 mm

Unscrew nut of clamping sleeve Loosen clamping sleeve by knocking with a steel pipe

7 8

9 10

11 12

4

Dismantling

Lift diffuser incl. impeller - Repeat this up to the bottom guide casing

Remove impeller from the diffuser

Remove pump shaft with NEMA coupling and first impeller Pull impeller from pump shaft

Remove clamping sleeveUnscrew nut of clamping sleeve

13 14

15 16

17 18

5

Dismantling

Impeller with clamping sleeve and fixation nut Lift off the lower diffuser

Remove strainer from suction piece

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21

6

Assembly

Assembly device Attach pump shaft with NEMA coupling

Attach the pump shaft at the special assembly device by means of the fixation screw M8x80 - cylinder head screw with hexagon socket and washer

Attach suction piece

Insert strainer Put lower diffuser on the suction piece

2

4

5 6

1

3

7

Assembly

Push impeller until stop of the lower diffuser Tighten clamping sleeve SW 22 mm - tightening torque 20 Nm - during tightening press impeller down

Put on other diffusers and the impeller and tighten clamping sleeve as described before - repeat this action up to the top diffuser

Put top diffuser on the pump shaft

Insert valve cone Attach the discharge piece

7 8

9 10

11 12

8

Assembly

Cable protection flap must correspond with the cable sheet recess of the suction port

Attach fixation strap

Put threaded bolt of the fixation strap into the provided hole of the suction piece

Attach fixation nuts

Evenly tighten with the double head box wrench on both sides alternately - Attention: Do not distort!

Correctly position cable protection

13 14

15 16

17 18

9

Assembly

Put cable sheet into the flap and screw in fixation screw Tighten the screw of the cable protection sheet with screw driver

Check play of the pump end: Upper tolerance: 39,5 mm – 40,5 mm Lower tolerance: 36,0 mm – 36,5 mm.

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