Spacer Ring 15mm AP

The 15 mm AP spacer ring is a mounting component used in the pump assembly to maintain correct spacing and position mating parts. In servicing AP-type pumps, the spacer ring is replaced when contact surfaces are worn, the ring is deformed, or during an overhaul when correct fit must be restored and play after reassembly reduced.

MPN / reference: 429041
Reference dimension: Ø 15 mm
Category: pressure-washer parts

APPLICATION

The spacer ring is used in typical pump service work:

• setting the spacing of components in the AP pump,
• restoring correct fit after dismantling the assembly,
• replacing a worn spacer element during refurbishment,
• reducing play in the pump’s mechanical assembly,
• repair work where spacing affects the stability of mating parts.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Consider replacing the ring when you notice:

• axial play or uncertain seating of parts after reassembly,
• uneven mechanical operation caused by incorrect spacing,
• wear marks, abrasion, or deformation of the ring after removal,
• difficulty reassembling the subassembly consistently and maintaining alignment,
• recurring issues after previous repairs if the spacer element was left in place despite wear.

HOW TO CHOOSE THE RIGHT PART

Selection should be unambiguous:

• confirm it is intended for the AP pump,
• verify the manufacturer number: MPN 429041,
• check the reference dimension Ø 15 mm and compare geometry with the removed part,
• base selection on the subassembly service documentation.

For spacer components, not only diameter matters - thickness and profile are also important, as they affect fit.

COMPATIBILITY

Select the ring based on MPN 429041 and compatibility with the AP pump. The Ø 15 mm parameter is a dimensional hint, but the key identifier is the manufacturer number and comparison with the removed component.

[faq]

Is the 15 mm spacer ring responsible for “taking up play”?|Indirectly, yes - its thickness and profile affect how mating parts are positioned. If the ring is worn, play can appear even if the subassembly is tightened correctly.

What marks on the ring indicate it should not be reinstalled?|Most commonly: abrasion on contact faces, deformation, “crushed” edges, or unevenness indicating it has been working under load.

Will replacing the ring solve the issue if guiding components are also worn?|Not fully. If bushings, guides, or contact surfaces are worn, a new ring may improve alignment, but the issue can return. It’s best to assess the entire set of mating components.

Is Ø 15 mm the inner diameter or the outer diameter?|In practice, the “15 mm” designation refers to the ring’s working size in the given assembly, often linked to the diameter of a mating part. The safest confirmation is by MPN 429041 and comparison with the removed part.

What should I check after reassembling the pump following spacer-ring replacement?|That parts seat consistently, there is no axial play, and the assembly runs steadily. In service, it’s also worth checking contact surfaces and other mounting components in the same area.

[/faq]