Danfoss PAH Series Manual de usuario
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
3
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
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
7
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
1
2
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
9
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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