Exchange the Needle Seat

When

Tools required

Qty.		p/n	Description
1		8710-0510	Open-end wrench 1/4-5/16 inch

Parts required

Qty.		p/n	Description
1		G4267-87012	High Pressure Needle Seat, 0.12 mm (PEEK) OR
1		G4267-87020	High Pressure Seat Assembly 0.075 mm (PEEK) (optional for G4767A, not used for G7167C)

Qty.

p/n

Description

G4267-87012

High Pressure Needle Seat, 0.12 mm (PEEK)

G4267-87020

High Pressure Seat Assembly 0.075 mm (PEEK)

(optional for G4767A, not used for G7167C)

Prerequisites

Finish any pending acquisition job.
Stop the flow at the pump and remove the solvent lines from the eluent bottles to avoid spilling solvent.
Close the shutoff valves at the pump if available.

WARNING

Risk of injury by uncovered needle

An uncovered needle is a risk of harm to the operator.

NOTE

Refer to the Agilent 1290 Infinity II Ultra Low Dispersion Kit Technical Note (p/n 01200-90105) for further details.

In the Local Controller start the maintenance mode and select Change needle/seat function.

OR

In the Agilent Lab Advisor software select Service & Diagnostics in the system screen Maintenance Positions > Change Needle , click Start and wait until the needle assembly is in maintenance position.
Slightly pull (1.) the front clip which holds the needle seat in position. Then carefully lift up (2.) the complete leak tube needle assembly from the holder.
In the Local Controller close Change needle /seat.

OR

In the Agilent Lab Advisor software Change needle click End and wait until the needle assembly is in the needle park position.
Perform a Pressure Test.

NOTE

Always flush the sampler with fresh solvent and perform a pressure test before using the Auto Clean or Prime function after exchanging a needle seat.

21-Jun-2025