Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual page 203

7.6.3.1 Disassembling the Pump Head and Removing the Piston Seals
1. To remove the pump head, follow the steps in section 7.6.2.1 (→ page 188).
Tip: Never disassemble the pump head with bare hands and place the
components only on a clean surface.
Put on a pair of clean room gloves to prevent contamination on the pump parts.
Even minute particles may cause damage to the system and result in poor pump
performance.
2. Remove the plate of the rear seal wash system if required.
Rear seal wash body
(pump head bushing)
Support ring
3. Remove the rear seal wash body (pump head bushing) from the pump head.
4. First, remove the support ring.
Tap the pump head on a surface to make the support ring drop out. If this does not
remove the support ring, push the seal insertion tool into the pump head and remove the
tool. The support ring is removed together with the tool.
Tip: Do not use the seal removal tool for the support ring because the ring can
be removed from the tool only with difficulties.
5. Remove the piston seal from the pump head.
Push the seal removal tool into the pump head as far as it goes in.
Seal removal tool
6. Remove the tool from the pump head. The piston seal is removed together with the
tool. The piston seal will be destroyed and cannot be reused.
Operating Instructions
Fig. 69: Pump head removed
Fig. 70: Piston seal removal and insertion tool
UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Plate of the rear
seal wash system
Rear seal wash body (pump head bushing)
Seal insertion tool
Piston
Page 195