danfoss PAHT G 50-90 High-Pressure Pumps Instruction Manual
- June 3, 2024
- Danfoss
Table of Contents
Danfoss PAHT G 50-90 High-Pressure Pumps
Introduction
NOTE: If the pump is disassembled within the warranty period, the pump is
no longer covered by the warranty. Tools required for dismantling the pump
Disassembling the pump
- Loosen and remove 4 screws.
- Remove mounting flange.
- Remove spring.
- Remove shaft sealing. Caution: Avoid to scratch the sealing surface on the shaft.
- Remove 2 guide pins.
- Remove O-ring.
- Turn pump upside down.
- Loosen and remove 10 screws.
- Remove cover.
- Remove pistons and retainer plate.
- Remove retainer ball
- Remove retainer
- Remove spring
- Remove cylinder barrel.
- Remove port plate.
- Remove 1 guide pin.
- Turn pump upside down and remove 2 washers.
- Loosen and remove 6 screws.
- Remove port flange.
- Remove 1 guide pin.
- Remove O-ring from port flange.
- Loosen thrust plate from cylinder barrel.
- Remove thrust plate.
- Remove O-rings from thrust plate.
- Remove backup rings from thrust plate.
- Remove 1 guide pin from end cover plate.
- Loosen and remove screw from swash plate.
- Remove 2 guide pins from end cover plate.
- Remove O-ring from end cover plate.
- Remove shaft sealing from mounting flange.
- Remove shaft sealing from mountingflange.
Pump disassembled
Inspection
Valve and thrust plate
-
Neither valve plate nor thrust plate must show any sign of wear.
-
Hold a ruler against surface of plate and check tightness against a light source.
-
Check that both O-rings and back-up rings are not broken and do not show severe wear.
Swash plate -
Check that surface of swash plate is smooth and without any large scratches (depth more than 0.1 mm). Pistons
-
Play in ball and socket joint must not exceed 0.1 mm.
-
Thickness of piston shoes must be at least 4.4 mm.
-
7. 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.
-
Check bushes in cylinderbarrel for wear and scratches.
-
Check main bearing for wear and scratches.
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).
- Tools required for assembly of the pump.
- Parts needed for assembly of the pump.
- Mount 1 guide pin in housing.
- ount O-ring in port flange.
- Mount port flange on housing. Use pin as guide.
- Mount 6 screws (M8x55).
- Tighten screws to 30Nm.
- Turn pump upside down.
- Mount 1 guide pin inside the housing on the back side of the port plate.
- Mount port plate. Be aware of orientation guide pin.
- Mount backup rings on the thrust plate.
- Mount O-rings on the thrust plate.
- Spray with water on cylinder barrel and thrust plate.
- Mount thrust plate on cylinder barrel.
- Press thrust plate into cylinder barrel.
- Mount cylinder barrel in housing.
- Mount spring.
- Mount retainer on top of the spring.
- Spray with water and mount retainer ball.
- Place retainer plate on top of retainer ball.
- Spray with water and mount pistons.
- Spray with water and mount O-ring on end cover.
- Mount 2 guide pins on endcover.
- Mount swash plate.
- Mount screw (M8x20).
- Tighten screw to 30Nm.
- Mount 1 guide pin on housing.
- Spray piston shoes with water.
- Mount endcover on the housing.
- Mount 10 screws (M8x20).
- Tighten 10 screws to 30Nm.
- Turn pump upside down and mount 2 guide pins.
- Spray with water and mount O-ring.
- Spray shaft sealing with water before mounting.
- Mount shaft sealing.
- Use tool and press shaft sealing into place.
- Mount transparent ring.
- Mount metal ring.
- Mount spring.
- Mount special tool on shaft.
- Spray with water.
- Mount sealing (smallest diameter pointing down).
- Mount mounting flange.
- Mount 4 screws.
- Tighten screws to 30Nm.
- Finished.
Spare parts list for PAHT 50-90| 180B4196 – Seal set (PAHT 50-90)|
180B4195 – Cylinder barrel set (PAHT 50-90)| 180B4192 – Valve plate set
(PAHT 50-70)| 180B4193 – Valve plate set (PAHT 80-90)| 180B4194 –
Piston set (PAHT 50-90)| 180B4252 – Swash plate set (PAHT 50)|
180B4255 – Swash plate set (PAHT 63)| 180B4258 – Swash plate set (PAHT
70)| 180B4253 – Swash plate set (PAHT 80)| 180B4256 – Swash plate
set (PAHT 90)
---|---|---|---|---|---|---|---|---|---|---
Pos.| Qnt.| Designation| Material
1| 1| Housing| AISI 316| | | | | | | | | |
2| 2| Pin ø4 x 14| AISI 304| x| | | | | | | | |
5| 10| Screw M8 x 16| AISI 304| x| | | | | | | | |
9| 1| O-ring ø135 x 3| NBR| x| | | | | | | | |
11| 1| End cover CW| AISI 316| | | | | | | | | |
31| 1| Swash plate| AISI 431| | | | | | x| x| x| x| x
32| 1| Screw M8 x 20| AISI 304| | | | | | x| x| x| x| x
34| 2| Pin ø4 x 14| AISI 304| | | | | | x| x| x| x| x
61| 1| Cylinder barrel| AISI 431| | x| | | | | | | |
62| 1| Spring| 1.4462| | | | | x| | | | |
64| 1| Retainer ball| AISI 431| | | | | x| | | | |
65| 1| Retainer plate| AISI 304| | | | | x| | | | |
66| 9| Piston| AISI 431/ PEEK| | | | | x| | | | |
67| 1| Key 8 x 7 x 32| AISI 316Ti| x| | | | | | | | |
70| 1| Washer| Polypropylen| x| | | | | | | | |
71| 1| Retainer| AISI 304 / PEEK| | | | | x| | | | |
91| 1| Port plate| AISI 304 / PEEK| | | x| x| | | | | |
92| 1| Valve plate| AISI 431| | | x| x| | | | | |
93| 9| Back up ring| PTFE| | | x| x| | | | | |
94| 9| O-ring ø18,3 x 2,4| NBR| | | x| x| | | | | |
121| 1| Port flange| AISI 316| | | | | | | | | |
122| 1| O-ring ø135 x 3| NBR| x| | | | | | | | |
123| 1| O-ring Ø65 x 5| NBR| x| | | | | | | | |
124| 1| Shaft sealing| AISI 304 / NBR| x| | | | | | | | |
125| 1| End cover| AISI 316| | | | | | | | | |
126| 1| Pin ø6 x 10| AISI 304| | | x| x| | | | | |
127| 6| Screw M8 x 70| AISI 304| x| | | | | | | | |
128| 4| Screw M8 x 55| AISI 304| x| | | | | | | | |
| 1| Service instruction| | x| x| x| x| x| x| x| x| x| x
Exploded view for PAHT 50-90 ****
7. Spare parts list for
PAHT G 50-90
| 180B4341 – Seal set (PAHT G 50-90)| 180B4339 – Cylinder barrel set
(PAHT G 50-90)| 180B4340 – Valve plate set (PAHT G 50-70)| 180B4344
– Valve plate set (PAHT G 80-90)| 180B4343 – Piston set (PAHT G 50-90)|
180B4326 – Swash plate set (PAHT G 50)| 180B4327 – Swash plate set
(PAHT G 63)| 180B4328 – Swash plate set (PAHT G 70)| 180B4329 –
Swash plate set (PAHT G 80)| 180B4330 – Swash plate set (PAHT G 90)
---|---|---|---|---|---|---|---|---|---|---
Pos.| Qnt.| Designation| Material
1| 1| Housing| AISI 316| | | | | | | | | |
2| 2| Pin ø4 x 14| AISI 304| x| | | | | | | | |
5| 10| Screw M8 x 16| AISI 304| x| | | | | | | | |
9| 1| O-ring ø135 x 3| NBR| x| | | | | | | | |
11| 1| End cover CW| AISI 316| | | | | | | | | |
31| 1| Swash plate| AISI 431| | | | | | x| x| x| x| x
32| 1| Screw M8 x 20| AISI 304| | | | | | x| x| x| x| x
34| 2| Pin ø4 x 14| AISI 304| | | | | | x| x| x| x| x
61| 1| Cylinder barrel| AISI 431| | x| | | | | | | |
62| 1| Spring| 1.4462| | | | | x| | | | |
64| 1| Retainer ball| AISI 431| | | | | x| | | | |
65| 1| Retainer plate| AISI 304| | | | | x| | | | |
66| 9| Piston| AISI 431 / PEEK| | | | | x| | | | |
67| 1| Key 8 x 7 x 32| AISI 316Ti| x| | | | | | | | |
70| 1| Washer| Polypropylen| x| | | | | | | | |
71| 1| Retainer| AISI 304 / PEEK| | | | | x| | | | |
91| 1| Port plate| AISI 304 / PEEK| | | x| x| | | | | |
92| 1| Valve plate| AISI 431| | | x| x| | | | | |
93| 9| Back up ring| PTFE| | | x| x| | | | | |
94| 9| O-ring ø18,3 x 2,4| NBR| | | x| x| | | | | |
121| 1| Port flange| AISI 316| | | | | | | | | |
122| 1| O-ring ø135 x 3| NBR| x| | | | | | | | |
123| 1| O-ring Ø65 x 5| NBR| x| | | | | | | | |
124| 1| Shaft sealing| AISI 304 / NBR| x| | | | | | | | |
125| 1| End cover| AISI 316| | | | | | | | | |
126| 1| Pin ø6 x 10| AISI 304| | | x| x| | | | | |
127| 6| Screw M8 x 70| AISI 304| x| | | | | | | | |
128| 4| Screw M8 x 55| AISI 304| x| | | | | | | | |
| 1| Service instruction| | x| x| x| x| x| x| x| x| x| x
Exploded view for PAHT G 50-90 ****
| ****
180Z0237 – Tool set
(PAH / PAHT / PAHT G 50-90)
---|---
Qnt.| Designation
1| Shaft bush, topedo| x
1| Press tool 1| x
1| Press tool 2| x
Danfoss A/S
High Pressure Pumps danfoss.com+45 7488 2222.highpressurepumps@danfoss.com Any information, including, but not limited to information on selection of product, its application or use, product design, weight, dimensions, capacity any other technical data in product manuals, catalogues descriptions, advertisements, etc. and whether made available in writing, orally, electronically, online or via download, shall be considered informative, and is only binding if and to the extent, explicit reference is made in a quotation or order confirmation. Danfos cannot accept any responsibility for possible errors in catalogs, brochures, videos and other material. Danfoss reserves the right to alter its products without notice. This also applies to products ordered but not delivered provided that such alterations can be made without changes to the form, ht or function of the product. All trademarks in this material are property of Danfoss A/S or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.
© Danfoss | DCS-SGDPT/SI | 2022.10
180R9172 | 521B1092 | AX234886U502908en-000402 | 24
References
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