Danfoss PAH 50 Manuale utente

521B1072 DKCFN.PI.011.NC3.02 09 -2013

INSTRUCTIONS

Servicing PAH 50 - 100

180R9098

Note:

If the pump is dismantled during the warranty

period, the pump is no longer under warranty.

Dismantling:

1. Tools required for dismantling the PAH 50 - 100 pump.

2. Remove parallel key and unscrew front screw M6 (10 mm key).

3. Unscrew screws in front ange.

4. Remove front ange.

5. Remove shaft seal using two screwdrivers.

6. Remove guide pin from housing and the two guide pins from

swash plate.

DKCFN.PI.011.NC3.02 521B1072

7. Remove swash plate using the 4 mm front screw.

8. Remove cylinder barrel from housing.

9. Unscrew the eight screws M8 in port ange (6 mm key).

10. Separate housing and port ange.

11. Remove valve plate from port ange.

12. Remove guide pins and guide.

521B1072 DKCFN.PI.011.NC3.02

13. Remove pistons.

14. Remove retaining plate.

15. Remove retaining ball.

16. Remove thrust plate using two screwdrivers.

17. Remove shaft sealing from front ange.

18. The ceramic ring removed from the front ange.

19. Wash all parts and replace all seals (inclusive shaft seal).

20. Inspect all parts carefully (see "Inspection") and replace any worn

parts.

21. If the pump has failed, the reason for the failure must be found

and xed before the repaired pump is re-installed.

DKCFN.PI.011.NC3.02 521B1072

Housing with bearing

Washer and screw

(for xing swash plate)

Retaining ball

Shaft seal

Thrust plate

with sealings

Pistons

Retaining plate

Cylinder barrel

Port ange

Key

Screws for anges

Ceramic ring

Retaining guide

Port plate

Five guide pins Swash plateO-rings

Front ange

521B1072 DKCFN.PI.011.NC3.02

Inspection:

Port plate and thrust plate

1. Neither port plate nor thrust plate must show any sign of wear.

2. Hold a ruler against surface of plate and check tightness against a

light source.

3. Check that both O-rings and back-up rings are not broken and do

not show severe wear.

Pistons

1. Play in ball and socket joint must not exceed 0.1 mm.

2. Thickness of piston shoes must be at least 4.4 mm.

3. Hold a ruler against surfaces of piston shoes to check that the

surfaces are even and smooth and without any scratches.

4. Pumps for technical water only:

It is acceptable that the (black) treated surfaces of the pistons are

partly worn.

DKCFN.PI.011.NC3.02 521B1072

Cylinder barrel:

1. Check outer bearing surface for large wear grooves (not critical).

2. Check that bushings are free from seizure and large scratches.

3. Ensure that pistons can move freely in bushings.

Housing:

1. Check bearing (black) for large wear grooves (not critical).

521B1072 DKCFN.PI.011.NC3.02

Swash plate:

1. Check that surface of swash plate is smooth and without any large

scratches (depth more than 0.1 mm).

DKCFN.PI.011.NC3.02 521B1072

Assembly:

1. Parts and tools required for assembly.

2. Check that all parts are OK. Replace all seals.

3. Mount O-ring, guide and guide pins on port ange.

4. Mount valve plate in its right position using pin as guide.

5. Mount housing using pin as guide.

6. Place housing and port ange near table edge and mount screws

from below.

7. Mount thrust plate with sealings on cylinder barrel.

521B1072 DKCFN.PI.011.NC3.02

8. Press thrust plate into cylinder barrel using a table or the like as

support.

9. Mount cylinder barrel in housing.

10. Slide retaining ball (smallest diameter pointing upwards) down the

shaft.

11. Mount retaining plate (smallest centre diameter pointing upwards).

12. Mount pistons.

13. Mount ceramic ring on the tool.

14. Mount ceramic ring by pressing tool as far down in front ange as

possible.

DKCFN.PI.011.NC3.02 521B1072

15. Push tool through front ange.

16. Mount shaft seal (carbon surface pointing downwards), spring, and

washer (edge pointing downwards) by sliding them over the tool.

17. Mount swash plate on front ange using pins as guide.

18. Press swash plate against front ange and screw tools together.

19. Mount O-ring on front ange.

20. Mount washer and screw in front ange to x swash plate.

21. Tighten screw to a torque of 8 Nm and remove tool.

Shaft seal

Washer

Spring

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