Agilent 5063-6589 PTFE Piston Seal 2-Pack for 1100/1200/1260 HPLC Pump Maintenance

The Agilent 5063-6589 PTFE Piston Seal is a replacement sealing component supplied in a convenient package of two pieces. It is intended for compatible Agilent liquid chromatography pumps and related LC modules, including commonly listed 1100, 1200, and 1260 Series systems. The seal is installed around the reciprocating piston area of the pump head, where it helps contain the mobile phase and maintain dependable liquid delivery during chromatographic analysis.

A worn piston seal may contribute to solvent leakage, unstable pressure, reduced pump efficiency, or inconsistent flow. Replacing the seal during scheduled maintenance can help restore the sealing interface and support normal pump operation. Part number 5063-6589 is identified by Agilent as a replacement PTFE piston seal and is supplied as two seals per package. Buyers should verify the instrument model, pump module number, application chemistry, and existing seal part number before ordering.

Agilent identifies 5063-6589 as a replacement PTFE piston seal for LC pumps and autosamplers. Additional compatibility listings include selected G1310, G1311, G1312, G1376, G2226 and G4302 modules, although final compatibility should always be confirmed against the exact instrument configuration.

An HPLC pump operates through repeated piston movement. During operation, the piston moves through the sealing area while the pump draws in and delivers mobile phase under controlled pressure. The seal is therefore exposed to continuous mechanical movement, solvent contact, pressure cycles and routine system operation.

Over time, the sealing surface may wear or become less effective. Seal condition can also be affected by contamination, deposits, an unsuitable solvent environment, piston damage, improper installation or extended service intervals. Agilent technical material notes that seal design and spring force influence pump-head sealing, air entry, pressure ripple and abrasion between the piston and seal.

The following symptoms may indicate that the pump-head sealing area requires inspection. These symptoms can also be caused by other flow-path components, so troubleshooting should include the piston, check valves, capillaries, fittings, purge valve and solvent-supply path.

Agilent publishes a specific seal-wear procedure for 1260 isocratic and quaternary pumps and lists part number 5063-6589 as the PTFE piston seal used in that service context.

When inspection confirms that the existing seal is worn, contaminated or leaking, replacement with the correct part can restore the sealing interface between the piston and pump head. The 5063-6589 package contains two PTFE piston seals, making it suitable for planned servicing where two sealing positions are involved or where a second seal is required as a maintenance spare, depending on the pump module.

Part number 5063-6589 is described in Agilent service documentation as a standard seal. Agilent also warns that the wear-in procedure intended for 5063-6589 should not be applied to the different normal-phase seal identified as 0905-1420, because the procedure can damage that alternative seal. The installed seal type and application must therefore be confirmed before maintenance.

The manufacturer product page describes 5063-6589 as a replacement PTFE piston seal for Agilent LC pumps and autosamplers. Independent chromatography-parts listings identify the package as two seals per pack.

Compatibility references vary by distributor and service configuration. Buyers should not select the seal only by the general system name. The complete module number, pump type, serial-number range, existing seal number and application should be checked before purchase.

The Agilent 5063-6589 piston seal is used as a service component in compatible liquid chromatography equipment. Its main application is within the pump-head assembly, where stable solvent delivery is essential to the performance of an LC or HPLC method.

The product may be considered when:

• The existing seal carries part number 5063-6589.
• The service manual specifies a PTFE piston seal.
• Solvent is visible around the pump-head sealing area.
• Preventive maintenance is due according to laboratory procedure.
• The piston seal has been removed during pump-head servicing.
• Pump pressure remains unstable after basic priming and fitting checks.
• A maintenance kit requires the 5063-6589 seal.
• A laboratory needs a spare two-piece package for future service.
• An instrument service company is repairing a compatible LC pump.
• The buyer has confirmed the exact pump module and seal specification.

An HPLC pump uses one or more reciprocating pistons to draw mobile phase from the solvent supply and deliver it into the analytical flow path. The piston repeatedly moves through the pump-head sealing area. The piston seal forms a controlled interface around the moving piston so that mobile phase remains within the pump chamber while the piston continues its intake and delivery strokes.

During the intake stroke, the pump chamber receives mobile phase. During the delivery stroke, the piston pressurizes and moves the liquid toward the downstream flow path. The seal must maintain contact with the piston without preventing its repeated movement. A suitable seal therefore contributes to liquid containment, pressure stability and consistent pump operation. Agilent technical information explains that incorrect seal characteristics can contribute to air entering the pump head, pressure ripple or excessive abrasion between the seal and piston.

A piston seal is a small component, but it works directly within the pump’s liquid-delivery mechanism. When the sealing interface is in good condition, the pump can operate with fewer leakage-related interruptions. When the seal becomes worn, the pump may require more frequent priming, cleaning or troubleshooting.

Replacing only the seal may not resolve every pump problem. The piston surface, check valves, purge valve, fittings, solvent filters, capillaries and degassing system may also affect flow and pressure. A complete diagnosis should therefore be performed before replacement, particularly when leakage continues after a new seal has been installed.

Selecting an HPLC piston seal requires more than matching the general instrument series. Similar-looking seals can be designed for different solvents, pressure ranges, pump modules or service procedures.

The most reliable starting point is the number on the existing packaging, maintenance record, spare-parts list or instrument service manual. For this product, the required number must be 5063-6589.

Do not order only by appearance. Different piston seals can have similar dimensions or colors while using different materials and operating requirements.

“1100 Series” or “1260 Series” alone may not provide enough information. Send the complete module number, such as G1311A, G1311B, G1311C, G1312A, G1312B or G1312C, together with a pump nameplate photograph. These module families are commonly included in compatibility listings for 5063-6589.

Part number 5063-6589 is identified as a PTFE piston seal. Agilent distinguishes this standard seal from the different normal-phase seal 0905-1420. The two should not be confused, especially when applying a seal wear-in procedure.

A damaged piston can shorten the service life of a new seal. Before installation, inspect the piston for scratches, residue, chips or visible wear. Replacing the seal without addressing piston damage may result in recurring leakage.

The standard listing for 5063-6589 is two seals per package. Confirm the number of packages required according to the pump configuration, maintenance plan and desired spare inventory.

Before ordering, specify whether your project requires:

Installation should be performed by qualified laboratory personnel or an experienced chromatography service technician. The instrument must be depressurized, disconnected from hazardous solvent sources and serviced according to the applicable manufacturer procedure.

• Confirm the exact instrument and pump module.
• Check that the ordered part number is 5063-6589.
• Prepare clean tools and an appropriate work area.
• Flush hazardous or buffered mobile phase as required.
• Release system pressure completely.
• Wear suitable personal protective equipment.
• Review the applicable pump service documentation.
• Inspect the replacement seals before opening the pump head.

• Avoid scratching the piston or pump-head surface.
• Do not contaminate the functional sealing surface.
• Observe the correct seal orientation.
• Use only the recommended installation tools.
• Inspect the piston before installing the new seal.
• Replace damaged supporting components when necessary.
• Tighten components according to the relevant service procedure.
• Do not mix components from different seal types.

• Prime the pump with a suitable solvent.
• Check all fittings for leakage.
• Follow the correct seal wear-in procedure where required.
• Monitor pressure stability and pump operation.
• Verify normal flow delivery before reconnecting the analytical column.
• Record the maintenance date and installed part number.
• Retain the second seal in clean, identified packaging when it is not immediately used.

Agilent’s 1100 pump support document states that the specified wear-in procedure applies to standard 5063-6589 seals and should not be used for the different normal-phase seal.

For a fast and accurate quotation, provide the following information:

Providing the complete module number helps prevent selection errors and allows compatibility to be checked before shipment.

Agilent 5063-6589 is a replacement PTFE piston seal used in compatible liquid chromatography pump and related module applications. It is supplied in a package containing two seals and is used during preventive maintenance or pump-head repair.

It is commonly listed for 1100, 1200 and 1260 Series systems, as well as selected G1310, G1311 and G1312 pump modules. Compatibility must still be confirmed using the complete module number and existing part number.

The standard package contains two PTFE piston seals. Buyers should order by package quantity rather than assuming that the quoted quantity refers to individual seals.

No. Agilent documentation distinguishes the standard 5063-6589 seal from the normal-phase application seal 0905-1420. The standard-seal wear-in procedure can damage the normal-phase seal, so the seal type must be verified before servicing.

Please provide part number 5063-6589, the complete pump module, instrument series, required quantity, supply preference and a photograph of the module nameplate or old package. This information supports accurate compatibility checking and quotation preparation.

Need a dependable source for Agilent 5063-6589 PTFE Piston Seals and other chromatography maintenance components?

Send us your inquiry with:

• Required part number
• HPLC system series
• Complete pump module number
• Required quantity
• Original or compatible supply preference
• Delivery country and postal code
• Expected delivery date
• Photos of the old part or instrument nameplate

Our sales team will review the information and prepare a clear quotation covering product description, package quantity, availability, shipping options and estimated delivery arrangements.

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