Lenntech Danfoss PAHF Series User manual
521B1121 DKCFN.PI.011.D1.02 11-2009
INSTRUCTION
Servicing PAHF 20-40
180R9180
180R9180
DISASSEMBLY
1. Tools required for dismantling PAHF 20-40
2. Loosen and remove 6 screws
3. Remove mounting ange
4. Remove O-ring
5. Remove 2 guide pins
6. Remove shaft sealing
7. Remove spring
NOTE: Disassembly of the pump within the warranty period
will void the warranty.
Lenntech
info@lenntech.com Tel. +31-152-610-900
www.lenntech.com Fax. +31-152-616-289
info@lenntech.com Tel. +31-152-610-900
www.lenntech.com Fax. +31-152-616-289
Lenntech
2 DKCFN.PI.012.D1.02 521B1121
12. Remove cover
13. Remove pin
14. Remove pistons and retainer plate
15. Remove retainer ball
8. Remove washer for shaft seal
9. Loosen ange (2 screws). Don’t remove yet.
10. Turn pump upside down
11. Loosen and remove 8 screws
521B1121 DKCFN.PI.012.D1.02 3
20. Remove pump housing from rest of the pump
21. Raise pump to vertical position and remove 1 guide pin
22. Remove cylinder barrel
23. Remove valve plate
16. Remove bush
17. Remove spring
18. Place pump horizontally
19. Remove 2 screws
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24. Remove 1 guide pin
25. Remove O-ring from port ange
26. Loosen thrust plate from cylinder barrel
27. Remove thrust plate
28. Remove O-rings from thrust plate
29. Remove back-up rings from thrust plate
30. Remove O-ring from end cover plate
521B1121 DKCFN.PI.012.D1.02 5
31. Remove shaft sealing from mounting ange
32.
33. Pump disassembled
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INSPECTION:
Valve and thrust plate
1. Neither valve plate nor thrust plate must show any sign of wear.
2. Hold a ruler against surface of plate and check tightness against a
light source.
3. Check that both O-rings and back-up rings are not broken and do
not show severe wear.
Swash plate:
1. Check that surface of swash plate is smooth and without any large
scratches (depth more than 0.1 mm).
Bearings
1. Check bearing in swash plate for wear and scratches
2. Check bearing in port ange for wear and scratches
Retainer cone:
1. Check the retainer cone for scratches
521B1121 DKCFN.PI.012.D1.02 7
Pistons
1. Clearance in ball and socket joint must not exceed 0.1 mm.
2. Thickness of piston shoes must be at least 4.1 mm.
3. Hold a ruler against surfaces of piston shoes to check that the
surfaces are even and smooth and without any scratches.
4. Check bushes in cylinder barrel for wear and scratches
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5. Place the port ange on a support (eg. a coupling housing)
6. Mount valve plate. Be aware of orientation/guide pin
7. Mount back-up rings on thrust plate
8. Mount O-rings on thrust plate
ASSEMBLY
1. Tools required for assembly of PAHF 20-40
2. Parts needed for assembly of PAHF 20-40
3. Mount O-ring in port ange
4. Mount 1 guide pin in port ange
521B1121 DKCFN.PI.012.D1.02 9
9. Spray water on cylinder barrel and thrust plate
10. Mount thrust plate on cylinder barrel
11. Press thrust plate into cylinder barrel
12. Spray water on valve plate
13. Mount cylinder in ange
14. Mount pump housing
15. Mount 2 x screws in the bottom
16. Tighten with tool
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17. Mount spring
18. Mount bushing
19. Mount retainer ball on top of the spring
20. Spray with water
21. Take out 2 pistons as showed
22. Mount pistons in housing
23. Mount the 2 last pistons
24. Mount 1 guide pin in pump housing
521B1121 DKCFN.PI.012.D1.02 11
25. Mount O-ring on end cover plate
26. Mount end cover plate in pump housing
27. Mount and cross-tighten 3 screws as showed.
Then mount the last 5 screws.
28. Tighten with 30Nm
29. Turn pump around and tighten 2 screws with 10 Nm
30. Mount the 2 guide pins
31. Mount the O-ring
32. Place special tool on shaft
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33. Mount the washer
34. Mount the spring
35. Mount the shaft seal (smallest diameter pointing down)
36. Mount shaft seal in ange
37. Press in place with special tool
38. Mount ange on shaft (remember to spray with water)
39. Mount the 6 screws.
40. Tighten with 30 Nm
521B1121 DKCFN.PI.012.D1.02 13
Shaft seal kit PAHF 20-40
180B4066
Valve plate kit PAHF 20-40
180B4067
Piston kit PAHF 20-40
180B4068
Cylinder barrel
PAHF 20-40 180B4069
Shaft seal tool set
PAHT/F 20-32 180Z0236
Screw and O-rings kit
PAHF 20-40 180B4070
Pos. Qnt. Unit Designation Material
- 1 Shaft bush, torpedo - X
- 1 Press tool 1 - X
- 1 Press tool 2 - X
1 1 Pc. Housing AISI316
2 2 Pcs. Pin 4 x 14 AISI304 X
32 8 Pcs. Screw M8 x 20 AISI 304 X
35 1 Pc. Bearing PEEK
36 1 Pc. O-ring Ø85 x 3 NBR XX
61 1 Pc. Cylinder barrel 1.4301 X
62 1 Pc. Spring SAF2205 X
63 1 Pc. Retainer PEEK X
64 1 Pc. Retainer ball Stainless steel (1.4057) X
65 1 Pc. Retainer plate 1.4301 X
66 9 Pcs. Piston Stainless steel (1.4057) X
67 1 Pc. Key 8x7x32 1.4571 / AISI316Ti X
91 1 Pc. Valve plate PAHT 20-32 AISI 304 / PEEK X
92 1 Pc. Thrust plate 1.4057/AISI 431 X
93 9 Pcs. Back-up ring PTFE X
94 9 Pcs. O-ring 13.00 x 2.00 NBR X
121 1 Pc. Port ange 1.4404/AISI 316
122 1 Pc. O-ring ø85 x 3 NBR XX
123 1 Pc. O-ring ø59.5 x 3 NBR X
124 1 Pc. Shaft sealing AISI 304 / NBR X
125 1 Pc. End cover 1.4401/AISI 316
126 1 Pc. Pin 5 x 10 AISI 304 X
127 8 Pcs. Screw M8 x70 AISI 304 X
128 2 Pcs. Screw M6 x 35 AISI 304 X
129 2 Pcs. Bleeding screw M6 1.4462
130 2 Pcs. O-ring ø4.5 x 1.5 NBR
131 1 Pc. Plug Polyamid
132 1 Pc. Plug Polymer
135 2 Pcs. Pin 4 x 14 AISI 304 X
136 3 Pcs. O-ring 11.0 x 2.0 NBR
140 1 Pc. Bearing PEEK
143 3 Pcs. Plug AISI 304
1 Pc. Service instruction 180R9180 XXXX X
Service kit list for PAHF 20-40
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EXPLODED VIEW:
