High-pressure pumps by Danfoss, world leading manufacturer | Danfoss
User Guide for Danfoss models including: PAHT 20-32, PAHT G 20-32, PAHT 20-32-PAHT G 20-32 High Pressure Pumps, PAHT 20-32-PAHT G 20-32, High Pressure Pumps, Pressure Pumps
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DocumentDocumentService guide PAHT / PAHT G pumps PAHT 20-32 / PAHT G 20-32 Disassembling and assembling hpp.danfoss.com Service guide | Disassembling and assembling PAHT / PAHT G 20-32 Table of Contents 1. Disassembling the pump..................................................................................................................................... 3 2. Inspection.................................................................................................................................................................. 9 2.1. Valve and thrust plate: .......................................................................................................................................... 9 2.2. Swash plate: .............................................................................................................................................................. 9 2.3. Pistons:......................................................................................................................................................................10 3. Assembling ............................................................................................................................................................. 11 4. Spare parts list for PAHT 20-32 ........................................................................................................................20 5. Exploded view PAHT 20-32 ...............................................................................................................................21 6. Spare parts list for PAHT G 20-32 ....................................................................................................................22 7. Exploded view PAHT G 20-32...........................................................................................................................23 8. Tool sets....................................................................................................................................................................24 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 PAHT / PAHT G 20-32. 2 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 1. Disassembling the pump 1. Tools required for dismantling the pump. 2. Loosen and remove 6 screws. 3. Remove mounting flange. 4. Remove shaft sealing. Caution: Avoid scratching the sealing surface on the shaft. 5. Remove spring. 6. Remove 2 guide pins. 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 3 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 7. Remove O-ring. 8. Turn pump upside down. 9. Loosen and remove 10 screws. 10. Remove cover. 11. View to pistons and retainer plate. 12. Remove pistons and retainer plate. 4 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 13. Remove retainer ball. 14. Remove retainer. 15. Remove spring. 16. Remove cylinder barrel. 17.Remove port plate. 18. Remove 1 guide pin. 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 5 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 19. Turn pump upside down. Loosen and remove 4 screws. 20. Remove port flange. 21. Remove 1 guide pin. 22. Remove O-ring from port flange. 23. Loosen thrust plate from cylinder barrel. 24. Remove thrust plate. 6 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 25. Remove O-rings from thrust plate. 26. Remove backup rings from thrust plate. 27. Remove 1 guide pin from end cover plate. 28. Loosen and remove screw from swash plate. 29. Remove swash plate. 30. Remove 2 guide pins from end cover plate. 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 7 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 31. Remove O-ring from end cover plate. 32. Remove shaft sealing from mounting flange. 33. 34. Pump disassembled. 8 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 2. Inspection 2.1. 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. 2.2. Swash plate: 1. Check that surface of swash plate is smooth and without any large scratches (depth more than 0.1 mm).. 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 9 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 2.3. Pistons: 1. Play 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. It is acceptable that the (black) treated surfaces of the pistons are partly worn.. 4. Check bushes in cylinderbarrel for wear and scratches. 5. Check main bearing for wear and scratches. 10 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 3. Assembling WARNING: Do not use silicone when assembling the pump. Do not reuse disassembled O-rings; they might be damaged. Always use new O-rings. Important: It is essential that the pump is serviced in conditions of absolute cleanliness. All parts must be absolute clean before mounting. Lubrication: · To prevent seizing-up, lubricate all threads with PTFE lubrication type. · O-rings inside pump may be lubricated only with clean filtered water. · O-rings for port flange, mounting flange and flushing valve must be lubricated. · It is important to lubricate ALL parts to be assembled with clean filtered water (Especially all PEEK parts). 1. Tools required for assembly of the pump. 2. Parts needed for assembly of the pump. 3. Mount 1 guide pin in housing. 4. Mount O-ring in port plate. 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 11 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 5. Mount port flange on housing. Use pin as guide. 6. Mount 4 screws (M8x50). 7. Tighten screws to 30Nm. 8. Turn pump upside down. 9. Mount 1 guide pin inside the housing on the back side of the port plate. 10. Mount port plate. Be aware of orientation/ guide pin. 12 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 11. Mount backup rings on the thrust plate. 12. Mount O-rings on the thrust plate. 13. Spray with water on cylinder barrel and thrust plate. 14. Mount thrust plate on cylinder barrel. 15. Press thrust plate into cylinder barrel. 16. Mount cylinder barrel in housing. 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 13 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 17. Mount spring. 18. Mount retainer on top of the spring. 19. Spray with water and mount retainer ball. 20. Place retainer plate on top of retainer ball. 21. Spray with water and mount pistons. 22. Spray with water and mount O-ring on end cover. 14 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 23. Mount 2 guide pins on endcover. 24. Mount swash plate. 25. Mount screw (M8x16). 26. Tighten screw to 30Nm. 27. Mount 1 guide pin on housing. 28. Spray piston shoes with water. 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 15 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 29. Mount endcover on the housing. 30. Mount 10 screws (M8x16). 31. Tighten 10 screws to 30Nm. 32. Turn pump upside down and mount 2 guide pins. 33. Spray with water and mount O-ring. 34. Spray shaft sealing with water before mounting. 16 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 35. Use tool and press shaft sealing into place. 36. Mount metal ring. 37. Mount spring. 38. Mount special tool on shaft. 39. Spray with water. 40. Mount sealing (smallest diameter pointing down). 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 17 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 41. Mount mounting flange. 42. Mount 6 screws. 43. Tighten screws to 30Nm. 18 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 Finished. 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 19 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 4. Spare parts list for PAHT 20-32 180B4055 - Seal set (PAHT 20-32) 180B4054 - Cylinder barrel set (PAHT 20-32) 180B4052 - Valve plate set (PAHT 20-32) 180B4053 - Piston set (PAHT 20-32) 180B4251 - Swash plate set (PAHT 20) 180B4254 - Swash plate set (PAHT 25) 180B4257 - Swash plate set (PAHT 32) Pos. Qnt. Designation 1 1 Housing 2 2 Pin Ø4 x 14 5 10 Screw M8 x 16 9 1 O-ring Ø102 x 3 11 1 End cover CW 31 1 Swash plate 32 1 Screw Ø8 x 16 34 2 Pin Ø4 x 14 61 1 Cylinder barrel 62 1 Spring 63 1 Retainer 64 1 Retainer ball 65 1 Retainer plate 66 9 Piston 67 1 Key 8 x 7 x 32 91 1 Port plate 92 1 Valve plate 93 9 Back up ring 94 9 O-ring Ø13 x 2 121 1 Port flange 122 1 O-ring Ø102 x 3 123 1 O-ring Ø59,5 x 3 124 1 Shaft sealing 125 1 End cover 126 1 Pin Ø5 x 10 127 6 Screw M8 x 60 128 4 Screw M8 x 50 1 Service instruction Material AISI 316 AISI 304 AISI 304 NBR AISI 316 AISI 431 AISI 304 AISI 304 AISI 431 AISI 304 PEEK AISI 304 1.4301 AISI 431 / PEEK AISI 316Ti AISI 304 / PEEK AISI 431 PTFE NBR AISI 316 NBR NBR AISI 304 / NBR AISI 316 AISI 304 AISI 304 AISI 304 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 20 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 5. Exploded view PAHT 20-32 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 21 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 6. Spare parts list for PAHT G 20-32 180B4333 - Seal set (PAHT G 20-32) 180B4335 - Cylinder barrel set (PAHT G 20-32) 180B4337 - Valve plate set (PAHT G 20-32) 180B4336 - Piston set (PAHT G 20-32) 180B4323 - Swash plate set (PAHT G 20) 180B4324 - Swash plate set (PAHT G 25) 180B4325 - Swash plate set (PAHT G 32) Pos. Qnt. Designation 1 1 Housing 2 2 Pin Ø4 x 14 5 10 Screw M8 x 16 9 1 O-ring Ø102 x 3 11 1 End cover CW 31 1 Swash plate 32 1 Screw Ø8 x 16 34 2 Pin Ø4 x 14 61 1 Cylinder barrel 62 1 Spring 63 1 Retainer 64 1 Retainer ball 65 1 Retainer plate 66 9 Piston 67 1 Key 8 x 7 x 32 91 1 Port plate 92 1 Valve plate 93 9 Back up ring 94 9 O-ring Ø13 x 2 121 1 Port flange 122 1 O-ring Ø102 x 3 123 1 O-ring Ø59,5 x 3 124 1 Shaft sealing 125 1 End cover 126 1 Pin Ø5 x 10 127 6 Screw M8 x 60 128 4 Screw M8 x 50 1 Service instruction Material AISI 316 AISI 304 AISI 304 NBR AISI 316 AISI 431 AISI 304 AISI 304 AISI 431 AISI 304 PEEK AISI 304 1.4301 AISI 431 / PEEK AISI 316Ti AISI 304 / PEEK AISI 431 PTFE NBR AISI 316 NBR NBR AISI 304 / NBR AISI 316 AISI 304 AISI 304 AISI 304 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 22 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 Service guide | Disassembling and assembling PAHT / PAHT G 20-32 7. Exploded view PAHT G 20-32 180R9175| 521B1108 | DKCFN.PI.012.E5.02 | 08.2019 23 180Z0236 - Tool set (PAH / PAHT / PAHT G 20-32) 8. Tool sets Qnt. Designation 1 Shaft bush, topedo x 1 Press tool 1 x 1 Press tool 2 x Danfoss A/S High Pressure Pumps DK-6430 Nordborg Denmark © Danfoss | DCS (im) | 2019.08 180R9175 | 521B1108 | DKCFN.PI.012.E5.02 | 24