Danfoss PAHT Series Manuale utente

Service guide

PAHT / PAHT G pumps

PAHT 20-32 / PAHT G 20-32Product type -

Disassembling and assembling

hpp.danfoss.com

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3..02 / 01.2016

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

by the warranty.

Introduction

Table of Contents

Contents

Introduction ............................................................................2

1. Disassembling the pump................................................................3

2. Inspection ..............................................................................9

2.1. Valve and thrust plate:...................................................................9

2.2. Swash plate: ............................................................................9

2.3. Pistons: ................................................................................10

3. Assembling ............................................................................11

4. Spare parts list for PAHT 20-32..........................................................20

6. Spare parts list for PAHT G 20-32........................................................21

8. Tool sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

This document covers the instructions for disassembling and assembling the axial piston pumps

PAHT / PAHT G 20-32.

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3.02 / 01.2016

1. Disassembling the

pump

2. Loosen and remove 6 screws.1. Tools required for dismantling the pump.

3. Remove mounting ﬂange.

4. Remove shaft sealing.

Caution: Avoid scratching the sealing

surface on the shaft.

5. Remove spring. 6. Remove 2 guide pins.

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3..02 / 01.2016

7. Remove O-ring. 8. Turn pump upside down.

11. View to pistons and retainer plate.

9. Loosen and remove 10 screws. 10. Remove cover.

12. Remove pistons and retainer plate.

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3.02 / 01.2016

13. Remove retainer ball. 14. Remove retainer.

15. Remove spring. 16. Remove cylinder barrel.

18. Remove 1 guide pin.17.Remove port plate.

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3..02 / 01.2016

19. Turn pump upside down. Loosen and

remove 4 screws. 20. Remove port ﬂange.

21. Remove 1 guide pin.

23. Loosen thrust plate from cylinder barrel.

22. Remove O-ring from port ﬂange.

24. Remove thrust plate.

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3.02 / 01.2016

25. Remove O-rings from thrust plate.

27. Remove 1 guide pin from end cover

plate.

26. Remove backup rings from thrust plate.

28. Loosen and remove screw from swash

plate.

30. Remove 2 guide pins from end cover

plate.29. Remove swash plate.

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3..02 / 01.2016

31. Remove O-ring from end cover plate.

32. Remove shaft sealing from mounting

ﬂange.

33.

34. Pump

disassembled.

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3.02 / 01.2016

1. Neither valve plate nor thrust plate must

show any sign of wear. .

1. Check that surface of swash plate is

smooth and without any large scratches

(depth more than 0.1 mm)..

2. Hold a ruler against surface of plate and

check tightness against a light source..

2. Inspection

2.2. Swash plate:

2.1. Valve and thrust plate:

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

are not broken and do not show severe

wear.

Service guide Disassembling and assembling PAHT / PAHT G 20-32

180R9175 / 521B1108 / DKCFN.PI.012.E3..02 / 01.2016

5. Check main bearing for wear and

scratches.

4. Check bushes in cylinderbarrel for wear

and scratches.

1. Play in ball and socket joint must not

exceed 0.1 mm.

2. Thickness of piston shoes must be at least

4.1 mm.

3. Hold a ruler against surfaces of piston

shoes to check that the surfaces are even

and smooth and without any scratches. It

is acceptable that the (black) treated

surfaces of the pistons are partly worn..

2.3. Pistons:

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