Danfoss PAH 50 Manuel utilisateur

Service guide

PAH pumps

PAH 50-100

Disassembling and assembling

hpp.danfoss.com

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

NOTE: If the pump is disassembled within the warranty period, the pump is no longer covered

by the warranty.

Introduction

Table of Contents 1. Disassembling the pump ................................................................................................................... 3

2. Inspection.............................................................................................................................................. 7

2.1. Port plate and thrust plate................................................................................................................. 7

2.2. Pistons.................................................................................................................................................... 7

2.3. Cylinder barrel ..................................................................................................................................... 8

2.4. Housing.................................................................................................................................................. 8

2.5. Swash plate .......................................................................................................................................... 8

3. Assembling ........................................................................................................................................... 9

4. Service kit list for PAH 50-100.......................................................................................................... 14

5. Exploded view PAH 50-100 .............................................................................................................. 15

This document covers the instructions for

disassembling and assembling the axial piston

pumps PAH 50-100

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

1. Disassembling the

pump

2. Remove the parallel key and unscrew the

front cover.1. Tools required for dismantling.

3. Unscrew the screws in the front ﬂange. 4. Remove the front ﬂange.

4. Remove the shaft seal using two

screwdrivers.

Caution: Avoid scratching the sealing

surface on the shaft.

6. Remove the guide pin from the housing

and the two guide pins from the

swash plate.

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

7. Remove the swash plate using the front

screw.

8. Remove the cylinder barrel from the

housing.

10. Separate the housing and the end cover.9. Unscrew the six screws in the end cover.

12. Remove the guide pins and the guide.11. Remove the valve plate from the end cover.

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

14. Remove the retaining plate.13 Remove the pistons.

15.Remove the retaining ball.

16. Remove the the thrust plate using two

screwdrivers.

18. The ceramic ring removed from the front

ﬂange.17. Remove shaft sealing from front ﬂange.

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

19. Wash all parts and replace all seals

(inclusive shaft seal).

21. If the pump has failed, the reason for the

failure must be found and ﬁxed before the

repaired pump is re-installed.

20. Inspect all parts carefully (see ”Inspection”)

and replace any worn parts.

Front Flange

Housing with

bearing

Port ﬂange

Screws for ﬂanges

Washer and

screw (for ﬁxing

swash plate)

Key

Five guide pins

Swash plate

Cylinder barrel

Retainer ball

Retaining guide

Thrust plate

with sealings

Port plate

Pistons

Ceramic ring

Shaft seal

Retainer plate

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

2. Hold a ruler against the surface of the

plates and check the tightness against a

light source.

1. Neither port plate nor thrust plate must

show any sign of wear.

3. Check that both O-rings and back-up rings

are not broken and do not show severe

wear.

2. Inspection 2.1. Port plate and thrust plate

3. Hold a ruler against the surfaces of the

piston shoes to check that the surfaces

are even and smooth and without any

scratches.

4. It is acceptable that the (black) treated

surfaces of the pistons are partly worn.

1. The play in the ball and socket joint must

not exceed 0.1 mm.

2. The thickness of the piston shoes must be

at least 4.3 mm.

2.2. Pistons

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

2. Check the bearing (the black part) for

large wear grooves (not critical).

2. Check that the bushings are free from

seizure and large scratches.

3. Ensure that the pistons can move freely in

the bushings.

1. Check the outer bearing surface for large

wear grooves (not critical).

2.3. Cylinder barrel

2.4. Housing

1. Check that the surface of the swash plate

is smooth and without any large scratches

(depth more than 0.1 mm).

2.5. Swash plate

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

1. Lubrication:

• To prevent seizing-up, lubricate all

threads with PTFE lubrication type.

• O-rings inside pump may be lubricated

only with clean ﬁltered water.

• O-rings for port ﬂange, mounting ﬂange

and ﬂushing valve must be lubricated.

• It is important to lubricate ALL parts to

be assembled with clean ﬁltered water

(Especially all PEEK parts).

2. Parts and tools required for assembly.

Check that all parts are OK. Replace all

seals.

WARNING:

Do not use silicone when assembling the

pump. Do not reuse disassembled O-rings;

they might be damaged. Always use new

O-rings.

3. Assembling

Important:

It is essential that the pump is serviced in

conditions of absolute cleanliness. All parts

must be absolute clean before mounting.

4. Mount the valve plate in its right position

using the pin as guide.

3. Mount the O-ring, the guide and the guide

pins on the port ﬂange.

Guide pin

Service guide | Disassembling and assembling PAH 50-100

180R9098 | 521B1072 | DKCFN.PI.011.NC5.02 | 06.2017

5. Mount the housing using the pin as guide.

6. Place housing and port ﬂange near table

edge and mount screws from below.

8. Press the thrust plate into the cylinder

barrel using a table or the like as support.

10. Slide the retaining ball (smallest diameter

pointing upwards) down the shaft.

7. Mount the thrust plate with sealings on

the cylinder barrel.

9. Mount the cylinder barrel in the housing.

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