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

2	180R9168 | 521B1099 | DKCFN.PI.012.C3.02 | 06.2017

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

1.Disassembling the pump

1. Tools required for dismantling.

3. Unscrew the screws in the front flange.

4.Remove the shaft seal using two screwdrivers.

Caution: Avoid scratching the sealing surface on the shaft.

2.Remove the parallel key and unscrew the front cover.

4. Remove the front flange.

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

3

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

7.Remove the swash plate using the front screw.

9. Unscrew the six screws in the end cover.

11. Remove the valve plate from the end cover.

8.Remove the cylinder barrel from the housing.

10. Separate the housing and the end cover.

12. Remove the guide pins and the guide.

4	180R9168 | 521B1099 | DKCFN.PI.012.C3.02 | 06.2017

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

13 Remove the pistons.

15.Remove the retaining ball.

17.Remove the ceramic ring from the front flange.

14. Remove the retaining plate.

16.Remove the the thrust plate using two screwdrivers.

18.The ceramic ring removed from the front flange.

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

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