Danfoss PAH 2-6.3 Manuale utente

danfoss.high-pressurepumps.com

Instruction

Disassembling and assembling

PAH 2-6.3, PAHT 2-6.3 and

PAHT G 2-6.3

MAKING MODERN LIVING POSSIBLE

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

2180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

Table of Contents 1. Disassembling ..........................................................................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 .............................................................................9

3. Assembling ............................................................................10

4. Spare parts list for PAH 2 / PAHT 2 ......................................................18

5. Exploded view PAH 2 / PAHT 2..........................................................19

6. Spare parts list for PAHT G 2 ............................................................20

7. Exploded view PAHT G 2 ...............................................................21

8. Spare parts list for PAH 4-6.3 / PAHT 3.2-6.3 .............................................22

9. Exploded view PAH 4-6.3 / PAHT 3.2-6.3 ................................................23

10. Spare parts list for PAHT G 3.2-6.3 ......................................................24

11. Exploded view PAHT G 3.2-6.3..........................................................25

12. Tool sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Note:

If the pump is dismantled during the warranty

period, the pump is no longer under warranty.

This document covers the instructions for

disassembling and assembling the axial piston

pumps PAH / PAHT / 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 and PAHT G 2-6.3

180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

3. Dismantle the front cover using a vice. 4. Remove the shaft seal using two screw-

drivers.

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.

2. Remove the parallel key and unscrew the

front cover.

1. Tools required for dismantling.1. Disassembling

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

4180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

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

9. Remove the pistons and the retaining plate

from the cylinder barrel.

NB: Items 10.1.a. and 10.1.b. concern

PAH 2, PAHT 2 and PAHT G 2 only

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

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

180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

NB: Items 10.2.a. through 10.2.c. concern

PAH 4-6.3, PAHT 3.2-6.3 and

PAHT G 3.2-6.3 only

10.2.a. Remove the retaining 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 and PAHT G 2-6.3 only

11. Loosen the valve plate using two screw-

drivers. Place one of the screwdrivers in the

slot of the valve plate.

12. Remove the valve plate.

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

6180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

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.

Port plate

Stop

Spring

Valve plate

with sealing

Pistons

Retaining plate

Cylinder barrel

Front cover

Flange

Housing with

swash plate

and bearing

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

180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

2. Inspection 2.1 Port plate and valve plate

1. Neither port plate nor valve plate must

show any sign of wear.

2. Hold a ruler against the surface of the

plates and check the tightness against a

light source.

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

are not broken and do not show severe

wear.

2.2 Pistons

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.

3. Hold a ruler against the surfaces of the

piston shoes to check that the surfaces are

even and smooth and without any scratches.

4. PAHT only:

It is acceptable that the (black) treated

surfaces of the pistons are partly worn o.

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

8180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

2.3 Cylinder barrel

1. Check the outer bearing surface for large

wear grooves (not critical).

3. Ensure that the pistons can move freely in

the bushings.

2. Check that the bushings are free from

seizure and large scratches.

2.4 Housing

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).

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

180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

2.5 Swash plate

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

2. Remove swash plate and guide pin. Guide pin

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

10 180R9094 / 521B0985 / DKCFN.PI.011.N4.02 / 09.2013

3. Assembling

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.

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).

Important:

It is essential that the pump is serviced in

conditions of absolute cleanliness. All parts

must be absolute clean before mounting.

3. Mount the O-ring on the ange. 4. Mount the port plate in its right position

using the pin as guide.

Guide

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