Maintenance of a Pump Head with Seal Wash Option (Infinity III Support Ring Design)

When

In case of maintenance or pump head internal leaks

Tools required

Qty.	p/n	Description
1		Hexagonal key, 4 mm
1	01018-23702	Insert tool
1		Screwdriver, small flat head

Parts required

Qty.	p/n	Description
1	5063-6589	Metering seal (pack of 2) for 100 µL analytical head , OR
1	0905-1420	PE seal (pack of 2)
1	5062-2484	Gasket, seal wash (pack of 6)
1	0905-1175	Wash seal (PTFE) , OR
1	0905-1718	Wash Seal PE
1	5063-6586	Sapphire piston, 100 µL

NOTE

Consider replacement of G4220-24134 (Backup Seal) in case of compromised performance (pressure ripple too high).

Prerequisites

Switch off the pump at the on/off switch.
Open the doors of the module.
Use an optional solvent shutoff valve or lift up solvent filters for avoiding leakages.
Remove the Pump Head Assembly.
Remove the wash solvent tubings from the support ring inlet and outlet.

NOTE

Both pump head assemblies use the same internal components. In addition, pump head A is fitted with the purge valve. The following procedure describes the removal and disassembly of pump head A (left). For pump head B (right) proceed in the same way and skip steps that deal with the purge valve.

Loosen the lock screw (two turns).
Install the pump head, see Reinstall the Pump Head Assembly.

21-Jun-2025