AM Pump head body

The AM pump head body is the base component of the AM pump’s hydraulic section, forming the working housing for the seats and seating zones of the water-system components. In service, it is replaced when the body is worn or damaged in a way that affects sealing and parameter stability, and seal-only repairs no longer provide a durable result.

MPN / reference: 404511

APPLICATION

The head body is used in typical AM pump service work:

• repair of the hydraulic section when working surfaces are worn,
• pump overhaul when seats and sealing zones are worn out,
• eliminating recurring leaks caused by body damage,
• refurbishment of machines used intensively in workshop and industrial applications.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Head-body replacement is most often considered when there are:

• recurring leaks despite seal replacement,
• unstable pressure resulting from worn seats or working surfaces,
• cracks, pitting, or deformation visible after disassembly,
• difficulty maintaining tightness after reassembly,
• accelerated wear of new seals due to worn base surfaces.

HOW TO CHOOSE THE RIGHT PART

Selection of the body should be unambiguous:

• confirm pump type: AM,
• verify the manufacturer number: MPN 404511,
• compare body geometry with the removed part (channels, mounting points, seating zones),
• base selection on the service documentation for the machine/pump.

For housing/body parts, tolerances and geometry are critical - a similar-looking part may differ in details that affect installation and sealing.

COMPATIBILITY

Select the head body based on MPN 404511 and compatibility with the AM pump and the specific machine variant. Fitment for Quadro 599-799 and Therm 870 should be confirmed in the parts list and by comparing with the removed component.

[faq]

Does “AM” mean a different pump type than AQ or AP?|Yes. It identifies the pump type and implies different body geometry and channel layout. That’s why bodies must not be mixed between pump types - the basis is MPN 404511 and AM pump compatibility.

What wears out most often in the head body over years of operation?|Most commonly the seats, working surfaces, and sealing zones. If the base is worn, new seals may not maintain tightness for long.

Can symptoms of a damaged body “look like” a valve problem?|Yes. Pressure fluctuations and unstable parameters can come from valves or from worn seats in the body. Final assessment is typically made after disassembly and inspection.

How should I prepare the system before installing a new body to prevent rapid wear?|Key points are cleaning the channels, ensuring good water filtration, and checking the condition of mating parts (pistons/plungers, valves, guides). Contamination and worn parts can quickly damage the new surfaces.

How can I be sure the body fits Quadro 599-799 or Therm 870?|Most reliably by MPN 404511, plus comparing geometry with the removed part and the parts list for the specific machine.

[/faq]