Danfoss PAH Series, PAHT C Series, PAHT Series, PAHT G Series, PAHT 2-6.3 Service Manual
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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
2
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
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
screw drivers.
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
4
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
5
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
6
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
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