Danfoss PAHT G 10 User manual

Instruction
Disassembling and assembling
PAH 10-12.5, PAHT 10-12.5 and
PAHT G 10-12.5
MAKING MODERN LIVING POSSIBLE Lenntech
[e-mail] Tel. [phone]
www.lenntech.com Fax. [phone]
[e-mail] Tel. [phone]
www.lenntech.com Fax. [phone]
Lenntech

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
2180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 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 10-12.5 / PAHT 10-12.5...........................................16
5. Exploded view PAH 10-12.5 / PAHT 10-12.5 ..............................................17
6. Spare parts list for PAHT G 10-12.5 ......................................................18
7. Exploded view PAHT G 10-12.5 .........................................................19
8. Tool sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
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 10-12.5.
Tools provided with tool set 180Z0235:
• Shaft bush, torpedo
• Press bush Ø18 (Plastic)

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 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 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
4180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013 4
11. Remove the spring guide.
7. Remove the housing. 8. Remove the cylinder barrel.
9. Remove the pistons and the retainer plate
from the cylinder barrel.
12. Remove the spring.
10. Remove the retainer guide.

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013
13. Loosen the valve plate using two screw-
drivers. Place one of the screwdrivers in the
slot of the valve plate.
14. Remove 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.

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
6180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013 6
Cylinder barrel
Front cover
Flange
Plugs
Housing with
swash plate
and bearing
Retainer guide
Retainer plate
Spring guide
Spring
Pistons
Shaft seal
Port plate
Front
cover crews
Valve plate with
sealing

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 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 4.1 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 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
8180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013 8
2.3 Cylinder barrel
1. Check the outer bearing surface for large
wear grooves (not critical).
2. Check that the bushings are free from
seizure and large scratches.
3. Ensure that the pistons can move freely in
the bushings.
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).
1
2

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 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 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
10 180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013
3. Assembling
2. Parts and tools required for assembly.
Check that all parts are OK.
Replace all seals.
3. Mount the O-ring on the ange. 4. Mount the port plate in its right position
using the pin as guide.
Guide
pin
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.

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013
10. Mount the spring guide.
7. Check that the gap between the cylinder
barrel and the valve plate is 1.5-2.5 mm.
8. Mount the cylinder barrel in the ange.
9. Mount the spring in the centre hole.
5. Mount the valve plate with seals on the
cylinder barrel.
6. Press the valve plate into the cylinder barrel
using a piece of plastic.

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
12 180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013 12
13. Insert the pistons. 14. All pistons inserted.
11. Mount the retainer guide on the spring
guide.
12. Mount the retainer plate on the retainer
guide. Ensure that the bended surface
points downwards.
15. Place pin and place swash plate ttet on
guide pin and center hole.

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013
18. Mount the pump housing using the pin as
guide.
19. Press the housing down by hand and insert
the screws.
Alignment
hole
Guide pin
16. Place the screw in the center hole. 17. Tighten to a torque of 10 ±1 Nm.
20. Tighten the screws to a torque of 22 Nm. 21. Mount the two O-rings in the ange and
the O -ring on the front cover.

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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22. Wet the shaft seal with water and mount it
in the front cover. Ensure that it is pressed
to the bottom.
23. Mount the washer with the edge pointing
upwards.
24. Mount the spring. 25. Fit the hollow bush onto the shaft.
26. Wet the shaft seal and slide it over the
bush.
27. Use the shaft seal tool when pressing the
shaft seal downwards.

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013
28. Press the shaft seal in position. 29. Remove the bush.
30. Mount the front cover and align it to the
screw holes.
31. Tighten the screws to a torque of 7 Nm.

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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4. Spare parts list for
PAH 10-12.5 / PAHT 10-12.5
180B4105 - Seal set (PAHT 10-12.5) 180B4107 - Cylinder barrel set (PAHT 10-12.5) 180B4113 - Cylinder barrel set (PAH 10-12.5) 180B4108 - Valve plate set (PAHT 10-12.5) 180B4106 - Piston set (PAHT 10-12.5) 180B4114 - Piston set (PAH 10-12.5) 180B4305 - Swash plate set (PAHT 10) 180B4306 - Swash plate set (PAHT 12.5)
Pos. Qnt. Designation Material
1 1 Housing AISI 304 / PEEK
2 1 Pin Ø5 x 10 AISI 316 x
5 4 Screw M8 x 20 AISI 304 x
31 1 Swash plate AISI 431 x x
32 1 Screw M6 x 8 AISI 304 x x
33 1Washer AISI 304 x x
34 1 Pin Ø5 x 10 AISI 316 x x
61 1Cylinder barrel AISI 431 / PEEK x x
62 1Spring AISI 316Ti x x
63 1Spring guide PEEK x x
64 1Retainer ball PEEK x x
65 1Retainer plate AISI 304 x x
66 5 Piston AISI 431/ PEEK x x
67 1 Key 5 x 5 x 20 AISI 316Ti x
91 1 Port plate AISI 304 / PEEK x
92 1 Valve plate AISI 431 x
93 5 Back up ring PTFE x
94 5 O-ring Ø13 x Ø2 NBR x
121 1Port ange AISI 304 / PEEK
122 1 O-ring Ø90 x Ø2 NBR x
123 1 O-ring Ø75,92 x Ø1,78 NBR x
124 1Shaft seal AISI 304 / NBR x
125 1End cover AISI 304
126 1 Pin Ø6 x 10 AISI 316
127 2 Screw M5 x 20 AISI 304 x
136 2 O-ring Ø7 x Ø1,5 NBR x
1Service instruction xxxxxxxx

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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5. Exploded view
PAH 10-12.5 / PAHT 10-12.5

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
18 180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013
6. Spare parts list for
PAHT G 10-12.5
180B4312 - Seal set (PAHT G 10-12.5) 180B4315 - Cylinder barrel set (PAHT G 10-12.5) 180B4313 - Valve plate set (PAHT G 10-12.5) 180B4314 - Piston set (PAHT G 10-12.5) 180B4321 - Swash plate set (PAHT G 10) 180B4322 - Swash plate set (PAHT G 12.5)
Pos. Qnt. Designation Material
1 1 Housing AISI 304 / PEEK
2 1 Pin Ø5 x 10 AISI 316 x
5 4 Screw M8 x 20 AISI 304 x
31 1 Swash plate AISI 431 x x
32 1 Screw M6 x 8 AISI 304 x x
33 1Washer AISI 304 x x
34 1 Pin Ø5 x 10 AISI 316 x x
61 1Cylinder barrel AISI 431 / PEEK x
62 1Spring AISI 316Ti x
63 1Spring guide PEEK x
64 1Retainer ball PEEK x
65 1Retainer plate AISI 304 x
66 5 Piston AISI 431/ PEEK x
67 1 Key 5 x 5 x 20 AISI 316Ti x
91 1 Port plate AISI 304 / PEEK x
92 1 Valve plate AISI 431 x
93 5 Back up ring PTFE x
94 5 O-ring Ø13 x Ø2 NBR x
121 1Port ange AISI 304 / PEEK
122 1 O-ring Ø90 x Ø2 NBR x
123 1 O-ring Ø75,92 x Ø1,78 NBR x
124 1Shaft seal AISI 304 / NBR x
125 1End cover AISI 304
126 1 Pin Ø6 x 10 AISI 316
127 2 Screw M5 x 20 AISI 304 x
136 2 O-ring Ø7 x Ø1,5 NBR x
1Service instruction x x x x x x

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
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180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013
7. Exploded view
PAHT G 10-12.5

Instruction Disassembling and assembling PAH 10-12.5, PAHT 10-12.5 and PAHT G 10-12.5
20 180R9095 / 521B0986 / DKCFN.PI.010.NA3.02 / 09.2013
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice.
This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
8. Tool sets
180Z0235 - Tool set (PAH / PAHT / PAHT G 10-12.5) Qnt. Designation
1 Shaft bush, topedo x
1 Press bush Ø18 (Plastic) x
Lenntech
[e-mail] Tel. [phone]
www.lenntech.com Fax. [phone]
[e-mail] Tel. [phone]
www.lenntech.com Fax. [phone]
Lenntech