Danfoss PAHT Series Instruction
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Danfoss PAHT Series Instruction

Danfoss PAHT Series Instruction

Paht and paht g 256-308 disassembling and assembling
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Instruction
Disassembling and assembling
PAHT and PAHT G 256-308
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  • Page 1 Instruction Disassembling and assembling PAHT and PAHT G 256-308 danfoss.high-pressurepumps.com...

  • Page 2: Table Of Contents

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Table of Contents Contents Introduction Disassembling the pump Assembling the pump Disassembling and assembling of the swash plate Disassembling and assembling of cylinder barrel and valve plate Changing pistons 6.2. Assembling When should the pistons be replaced Spare parts list for PAHT 256-308...

  • Page 3: Disassembling The Pump

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Disassembling the pump 2. Using a 10 mm combination wrench, unscrew the four bolts from shaft seal flange. 1. Disconnect the pump from the rest of the If shaft seal flange is stuck, screw in two system.
  • Page 4 Instruction Disassembling and assembling PAHT and PAHT G 256-308 8. Using a 13 mm combination wrench, remove all the bolts on the mounting flange except the three shown in the next picture. 9. Unscrew the remaining three bolts. Turn WARNING: each bolt one round at the time to make Do not loosen the two screws keeping sure that the flange is removed as straight...
  • Page 5 Instruction Disassembling and assembling PAHT and PAHT G 256-308 15. Mount a 8 mm eye bolt in the cylinder barrel. Pull straight upwards. A continuous lift will elevate the cylinder barrel out of housing. This can only be done if shaft seal is removed.

  • Page 6: Assembling The Pump

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Assembling the pump WARNING: Important: Do not use silicone when assembling the It is essential that the pump is serviced in pump. Do not reuse disassembled O-rings; conditions of absolute cleanliness. All parts they might be damaged.

  • Page 7: Paht And Paht G 256-308

    10. Unscrew M8 eye bolt. shaft bearing might be damaged. Place the four springs and spring guide in Replacement can only be done at cylinder barrel. Springs must be Danfoss, Nordborg. positioned in the holes. 180R9268 / 521B1236 / DKCFN.PI.011.B3.02 / 01.2015...

  • Page 8: Paht And Paht G 256-308

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 11. Retainer guide, retainer ball and 12. Ensure that retainer plate is oriented retainer plate must be mounted as correctly, i.e. with its slant surfaces indicated in below picture. pointing downwards. 14.

  • Page 9: Paht And Paht G 256-308

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Shaft seal 19. Place stop for shaft seal on shaft. WARNING: Ensure that carbon ring is pointing 18. Place pump horizontally to get access to shaft. outwards. 21. Press new ceramic ring into retainer ring by using plastic tool provided.

  • Page 10: Disassembling And Assembling Of The Swash Plate

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Disassembling and WARNING: assembling of the Make sure that the surface on the swash swash plate plate does not get any marks. 1. Place the swash plate upside down. Remove the 2 bolts holding the swash plate.

  • Page 11: Disassembling And Assembling Of Cylinder Barrel And Valve Plate

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Disassembling and assembling of cylinder barrel and valve plate Mount backup rings first Mount then O-rings 1. Push a screwdriver into the hole between cylinder barrel and valve plate. Carefully push downward the screwdriver so that it 2.

  • Page 12: Changing Pistons

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Changing pistons Note : It is essential that the pump is serviced in conditions of absolute cleanliness. Tools needed: • 13 mm combination wrench • 6 mm allen key • Tool set 180B4347 Stop for retainer ball 6.1 Disassembling...
  • Page 13 Instruction Disassembling and assembling PAHT and PAHT G 256-308 Drain plug 5. If the flange does not move forward - 6. Remove the flange when the remaining loosen the drain plug to empty the pump three screws have been loosened. The from water by releasing vacuum.

  • Page 14: Paht And Paht G 256-308

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 11. WARNING: Ensure that the piston shoes and the piston surfaces are not damaged during removal. It is recommended to place the 12. Remove the retainer ring by sliding it pistons upside down on an even and across the stop for the retainer ball.

  • Page 15: 6.2. Assembling

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 6.2. Assembling 1. Carefully push the retainer ring in place. 2. Insert the pistons randomly. 4. Place the retainer ring in an odd angle corresponding to the orientation of the 3. Remove the stop for retainer ball. swash plate.
  • Page 16 Instruction Disassembling and assembling PAHT and PAHT G 256-308 8. Remove the guide bolt. Mount the three screws. Tighten them to a torque of 30 Nm ± 3 Nm. 7. Mount the three screws as shown above. Connect the pump to the rest of the Tighten them to a torque of 30 Nm ±...

  • Page 17: When Should The Pistons Be Replaced

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 When should the This section provides guidance on, how to determine whether the parts of the pump are pistons be replaced worn and should be replaced. In case of doubt - the pistons must be replaced. The pictures below are meant as a guideline for evaluating the wear of the sliding surface.

  • Page 18: Spare Parts List For Paht 256-308

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Spare parts list for PAHT 256-308 Pos. Qty. Designation Material Designation Material Housing Duplex / PEEK Pin ø6 x 10 AISI 316 Bleeding plug G 1/4" Super duplex O-ring ø11 x 2 Screw M8 x 30 AISI 316 O-ring ø228 x 4...

  • Page 19: Spare Parts List For

    Instruction Disassembling and assembling PAHT and PAHT G 256-308 Spare parts list for PAHT G 256-308 Pos. Qty. Designation Material Designation Material Housing Duplex / PEEK Pin ø6 x 10 AISI 316 Bleeding plug G 1/4" Super duplex O-ring ø11 x 2 Screw M8 x 30 AISI 316 O-ring ø228 x 4...
  • Page 20 Instruction Disassembling and assembling PAHT and PAHT G 256-308 Danfoss A/S High Pressure Pumps DK-6430 Nordborg Denmark 180R9268 / 521B1236 / DKCFN.PI.011.B3.02 / 01.2015...

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Paht g seriesPaht 256-308Paht g 256-308

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