Maintenance of a Pump Head with Seal Wash Option

For bio-inert modules use bio-inert parts only!

When

In case of maintenance or pump head internal leaks.

Tools required

Qty.		p/n	Description
1			Wrench 1/4 inch
1			Hexagonal key, 4 mm

Parts required

Qty.	p/n	Description
1	01018-23702	Insert tool
1	0905-1175	Wash seal (PTFE) , OR
1	0905-1718	Wash Seal PE , OR
1	0905-1731	Bio-Inert Wash Seal
1	5062-2484	Gasket, seal wash (pack of 6)
1	5063-6589	PTFE seal (pack of 2) , OR
1	G5611-21503	Seal PTFE (Bio-inert) OR
1	0905-1420	PE seal (pack of 2)
1	5063-6586	Sapphire piston, 100 µL , OR
1	5067-4695	Sapphire piston (Bio-inert)
1	8660-0852	Abrasive Mesh (Micro-Grit Paper)

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

G5654A only: G5611-60016 (Seal Holder (Bio-inert)) consists of two separate parts: seal holder and backup seal. Make sure to install the backup seal in the correct way as described below in order to avoid damaging the piston seals.

NOTE

G5654A only: Consider replacement of G4220-24134 (Backup Seal) in case of compromised performance (pressure ripple too high).

Loosen the lock screw (two turns).
CAUTION
G5654A only: Seal life time
Wrongly inserting the backup seal will strongly reduce the life time of the seals and the pump head parts.
- Note the correct installation of the backup seal inside the support ring.
If the backup seal has been removed from the seal holder, insert it in the correct orientation. Please ensure that the cut end faces the seal holder.
Place a seal wash gasket in the recess of the support ring. Use a matching orientation of gasket and support ring. Put the seal holder on top of the gasket.
Install the pump head, see Reinstall the Pump Head Assembly.

21-Jun-2025