When
To install a replacement piston seal after seal removal
Parts required
Piston seal
Support ring that was removed during piston seal removal
The support ring is not a wear part and can be reinstalled. Install a new support ring only when the ring is damaged.
Pump head seals for reinstallation if necessary
Tools and additional items required
Screwdriver, Torx T30
Syringe filled with isopropanol
Cleaning swab
Lint-free tissue
Seal-handling tool
No. | Description |
---|---|
1 | Removal pin |
2 | Insertion pin |
3 | Knurl for opening and closing the seal-handling tool |
Parts affected on the pump head
No. | Description |
---|---|
1 | Pump head |
2 | Piston seal |
3 | Support ring |
4 | Pump head seals (for seal wash plate and seal wash plate screws) |
5 | Seal wash plate |
6 | Screws, seal wash plate (4 screws) |
7 | Piston |
Follow these steps
Clean the support ring from the inside and outside, using isopropanol, a cleaning swab, and a lint-free tissue.
Pipette a few drops of isopropanol into the cavity of the pump head, on the edge on which the piston seal will rest.
Slide the support ring and the piston seal onto the insertion pin of the seal-handling tool. The open side of the piston seal faces away from the tool.
No. | Description |
---|---|
1 | Piston seal (open side facing away from tool) |
2 | Support ring |
3 | Insertion pin, seal-handling tool |
With the insertion pin, push the seal-handling tool into the pump head as far as it goes in and remove the tool. The piston seal and support ring remain in the pump head.
Check that the pump head seals are correctly installed. If the seals came off or if they do not rest properly in the receiving grooves, reinstall the seals. See Installing the Pump Head Seals.
Place the seal wash plate onto the pump head and insert the screws.
With the screwdriver, tighten the screws crosswise.
Tighten the screws crosswise once again.
Install the piston. See Installing the Pistons.
Install the pump head. See Installing the Pump Head. However, before you run the script to test the pump for leakage, operate the pump for 30 minutes with a backpressure of 80 MPa (recommended) to allow the new piston seals to run in.