Danfoss PAH 20, PAH 25, PAH 32 Service guide

Service guide

PAH pumps
PAH 20-32
Disassembling and assembling

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Service guide | Disassembling and assembling PAH 20-25-32

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 25-32 ............................................................................................................14

5. Exploded view PAH 25-32 ................................................................................................................ 15

Introduction

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

This document covers the instructions for
disassembling and assembling the axial piston
pumps PAH 20-25-32

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180R9168 | 521B1099 | DKCFN.PI.012.C3.02 | 06.2017

Service guide | Disassembling and assembling PAH 20-25-32

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 ange. 4. Remove the front ange.

4. Remove the shaft seal using two
screw drivers.

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.

180R9168 | 521B1099 | DKCFN.PI.012.C3.02 | 06.2017

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Service guide | Disassembling and assembling PAH 20-25-32

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.

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180R9168 | 521B1099 | DKCFN.PI.012.C3.02 | 06.2017

Service guide | Disassembling and assembling PAH 20-25-32

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

15.Remove the retaining ball.

17. Remove the ceramic ring from the front

ange.

16. Remove the the thrust plate using two
screwdrivers.

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

180R9168 | 521B1099 | DKCFN.PI.012.C3.02 | 06.2017

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