Danfoss PAH 2, PAHT 2, PAHT C 2, PAH 3.2-6.3, PAHT 3.2-6.3 Service guide
...
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
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Service guide | Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3
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
4.1 Exploded view for PAH / PAHT / PAHT C 2 ...............................................17
5. Spare parts list for PAHT G 2 ............................................................18
5.1 Exploded view for PAHT G 2 ............................................................19
6. Spare parts list for PAH / PAHT / PAHT C 3.2-6.3 .........................................20
6.1 Exploded view for PAH / PAHT / PAHT C 3.2-6.3 .........................................21
7. Spare parts list for PAHT G 3.2-6.3 ......................................................22
7.1 Exploded view for PAHT G 3.2-6.3 ......................................................23
Introduction
NOTE: If the pump is disassembled within the warranty period, the pump is no longer covered
by the warranty.
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)
2
180R9094 | 521B0985 | DKCFN.PI.011.N6.02 | 06.2017
Service guide | Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3
1. Disassembling the
pump
1. Tools required for dismantling.
Caution: Avoid scratching the sealing
surface on the shaft
2. Remove the parallel key and unscrew the
front cover.
4. Remove the shaft seal using two
screw drivers.
Caution: Avoid scratching the sealing
3. Dismantle the front cover using a vice.
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.
180R9094 | 521B0985 | DKCFN.PI.011.N6.02 | 06.2017
3
Service guide | Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3
7. Remove the housing. 8. Remove the cylinder barrel.
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
10.1.b. Remove the stop.10.1.a. Remove the spring
4
180R9094 | 521B0985 | DKCFN.PI.011.N6.02 | 06.2017
Service guide | Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3
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
10.2.a. Remove the retainer guide.
10.2.c. Remove the spring.
10.2.b. Remove the spring guide.
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
11. Loosen the valve plate using two
screwdrivers. Place one of the
screwdrivers in the slot of the valve plate.
180R9094 | 521B0985 | DKCFN.PI.011.N6.02 | 06.2017
12. Remove the valve plate.
5
Service guide | Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3
13. Remove the ve O-rings and the ve
back-up O-rings. 14. Remove the port plate from the ange.
Flange
Front cover
Valve plate
with sealing
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.
Housing with
swash plate
and bearing
Cylinder barrel
Retainer plate
Pistons
Port plate
Spring
Stop
6
180R9094 | 521B0985 | DKCFN.PI.011.N6.02 | 06.2017
Service guide | Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3
2. Inspection 2.1. Port plate and valve plate
2. Hold a ruler against the surface of the
1. Neither port plate nor valve plate must
show any sign of wear.
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.
PAHT only:
It is acceptable that the (black) treated
surfaces of the pistons are partly worn o.
180R9094 | 521B0985 | DKCFN.PI.011.N6.02 | 06.2017
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Service guide | Disassembling and assembling PAH 2-6.3, PAHT 2-6.3, PAHT C 2-6.3 and PAHT G 2-6.3
2.3. Cylinder barrel
2. Check that the bushings are free from
seizure and large scratches, and ensure
1. Check the outer bearing surface for large
wear grooves (not critical).
2.4. Housing
that the pistons can move freely in the
bushings.
1. Check that the swash plate surface is
smooth and without any big scratches
(depth more than 0.1 mm).
2.5. Swash plate
2. Check the bearing (the black part) for
large wear grooves (not critical).
1. Unscrew center bolt from the swash plate.Mounted swash plate:
8
180R9094 | 521B0985 | DKCFN.PI.011.N6.02 | 06.2017
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