Danfoss PAH Series Bedienungsanleitung

Servie guide

PAH, PAHT, PAHT G pumps

PAH 10-12.5, PAHT 10-12.5 and

PAHT G 10-12.5

Disassembling and assembling

hpp.danfoss.com

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

2180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 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 valve plate .................................................................................................................7

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

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

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

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

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

4. Spare parts list for PAH 10-12.5 / PAHT 10-12.5 ...........................................................................15

4.1. Exploded view PAH 10-12.5 / PAHT 10-12.5..................................................................................16

5. Spare parts list for PAHT G 10-12.5.................................................................................................17

5.1. Exploded view PAHT G 10-12.5 .......................................................................................................18

This document covers the instructions for

disassembling and assembling the axial piston

pumps PAH / PAHT / PAHT G 10-12.5.

Tools provided with tool set 180Z0235:

• Shaft bush, torpedo

• Press bush ø18 (Plastic)

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 06.2017

1. Disassembling the

pump

2. Remove the parallel key and unscrew the

front cover.1. Tools required for dismantling.

3. Dismantle the front cover using a vice.

4. Remove the shaft seal using two

screwdrivers.

Caution: Avoid scratching the sealing

surface on the shaft.

5. Remove the two small O-rings from the

ange. Remove the seal from the front

cover using a screwdriver. 6. Unscrew the four screws for the housing.

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

4180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 06.2017

7. Remove the housing. 8. Remove the cylinder barrel.

10. Remove the retainer guide.

9. Remove the pistons and the retainer plate

from the cylinder barrel.

12. Remove the spring.11. Remove the spring guide.

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 06.2017

14. Remove the valve plate.

13. Loosen the valve plate using two

screwdrivers. Place one of the

screwdrivers in the slot of the valve plate.

15. Remove the ve O-rings and the ve

back-up O-rings. 16. Remove the port plate from the ange.

17. Wash all parts and replace all seals

(inclusive shaft seal).

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

failure must be found and xed before the

repaired pump is re-installed.

18. Inspect all parts carefully (see

“Inspection”

)

and replace any worn parts.

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

6180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 06.2017

Front cover

Flange

Plugs

Front

cover crews

Valve plate with

sealing

Cylinder barrel

Housing with

swash plate

and bearing

Retainer guide

Retainer plate

Spring guide

Spring

Pistons

Shaft seal

Port plate

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 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 valve 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 valve 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.

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 4.1 mm.

2.2. Pistons

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

8180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 06.2017

2. Check the bearing (the black part) for

large wear grooves (not critical).

1. Check that the swash plate surface is

smooth and without any big scratches

(depth more than 0.1 mm).

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

2. Unscrew center bolt from the swash plate.1. Mounted swash plate:

2.5. Swash plate

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 06.2017

Guide pin1. Remove swash plate and guide pin.

1. Lubrication:

• To prevent seizing-up, lubricate all

threads with PTFE lubrication type.

• O-rings inside pump may be lubricated

only with clean ltered water.

• O-rings for port ange, mounting ange

and ushing valve must be lubricated.

• It is important to lubricate ALL parts to

be assembled with clean ltered 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.

Service guide | Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5

10 180R9095 | 521B0986 0 | DKCFN.PI.010.NA4.02| 06.2017

4. Mount the port plate in its right position

using the pin as guide.3. Mount the O-ring on the ange.

Guide pin

6. Press the valve plate into the cylinder

barrel using a piece of plastic.

5. Mount the valve plate with seals on the

cylinder barrel.

8. Mount the cylinder barrel in the ange.

7. Check that the gap between the cylinder

barrel and the valve plate is 1.5-2.5 mm.

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