Danfoss PAH Series Manuel utilisateur

Service guide

PAH, PAHT, PAHT C, PAHT G pumps

PAH 2-6.3/PAHT 2-6.3/PAHT C 2-6.3

and PAHT G 2-6.3

Disassembling and assembling

HPP.danfoss.com

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

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 .............................................................................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 / PAHT / PAHT C 2 ...............................................16

5. Spare parts list for PAHT G 2............................................................17

6. Spare parts list for PAH / PAHT / PAHT C 3.2-6.3 .........................................18

7. Spare parts list for PAHT G 3.2-6.3 ......................................................19

This document covers the instructions for

disassembling and assembling the axial piston

pumps PAH / PAHT / PAHT C / PAHT G 2-6.3.

Tools provided with tool set 180Z0235:

• Shaft bush, torpedo

• Press bush Ø18 (Plastic)

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

1. Disassembling the

pump

2. Remove the parallel key and unscrew the

front cover.

1. Tools required for dismantling.

Caution: Avoid scratching the sealing

surface on the shaft

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.

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

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

10.1.b. Remove the stop.10.1.a. Remove the spring

9. Remove the pistons and the retainer plate

from the cylinder barrel.

NB: Items 10.1.a. and 10.1.b. concern PAH 2, PAHT 2, PAHT C 2 and PAHT G 2 only

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

10.2.a. Remove the retainer guide. 10.2.b. Remove the spring guide.

10.2.c. Remove the spring.

NB: The following items concern PAH 2-6.3, PAHT 2-6.3, Paht C 2-6.3 and

PAHT G 2-6.3 only

NB: Items 10.2.a. through 10.2.c. concern PAH 4-6.3, PAHT 3.2-6.3, PAHT C 3.2-6.3 and

PAHT G 3.2-6.3 only

12. Remove the valve plate.

11. Loosen the valve plate using two

screwdrivers. Place one of the

screwdrivers in the slot of the valve plate.

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

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

back-up O-rings. 14. Remove the port plate from the ange.

15. Wash all parts and replace all seals

(inclusive shaft seal).

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

failure must be found and xed before

the repaired pump is re-installed.

16. Inspect all parts carefully

(see “Inspection”) and replace any worn

parts.

Stop

Spring

Pistons

Retainer plate

Cylinder barrel

Housing with

swash plate

and bearing

Port plate

Valve plate

with sealing

Front cover

Flange

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

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.

PAHT only:

It is acceptable that the (black) treated

surfaces of the pistons are partly worn o.

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 2.85 mm.

2.2. Pistons

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

2. Check that the bushings are free from

seizure and large scratches, and 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

1. Check that the swash plate surface is

smooth and without any big scratches

(depth more than 0.1 mm).

2. Check the bearing (the black part) for

large wear grooves (not critical).

2.4. Housing

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

2.5. Swash plate

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

Guide pin2. 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.

Instruction Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N5.02 / 09.2015

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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