Spacer Ring 18mm AP

The 18 mm AP spacer ring is a mounting component used in the pump assembly to maintain the correct distance and position of mating parts. In servicing AP-type pumps, spacer rings are replaced when worn, deformed, or during an overhaul when correct fit and alignment must be restored.

MPN / reference: 410152
Reference dimension: Ø 18 mm

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 spacer element during pump refurbishment,
• reducing play caused by wear of mounting components,
• repair work where spacing affects the stability of the pump’s mechanical operation.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Consider replacing the ring when you notice:

• noticeable play after reassembling the pump unit,
• unstable operation of mechanical parts caused by incorrect spacing,
• wear marks, scratches, or deformation of the ring after removal,
• difficulty seating mating components correctly,
• recurring issues after previous service if the spacer element was left in place despite wear.

HOW TO CHOOSE THE RIGHT PART

Selection of a spacer ring should be unambiguous:

• confirm it is intended for the AP pump,
• verify the manufacturer number: MPN 410152,
• check the reference dimension Ø 18 mm and compare geometry with the removed part,
• base selection on the pump service documentation.

For spacer components, not only diameter matters, but also thickness and profile - even a small difference can change fit and accelerate wear of mating parts.

COMPATIBILITY

Select the ring based on MPN 410152 and compatibility with the AP pump. The Ø 18 mm parameter is a dimensional hint, but the key identifiers are the manufacturer number and comparison with the removed component.

[faq]

Can a spacer ring affect pump noise?|Indirectly, yes. If spacing is incorrect and play or misalignment occurs, noise and vibration increase and wear progresses faster.

Does the spacer ring in an AP pump always have the same thickness?|You shouldn’t assume so. Similar systems can have different variants. That’s why selection should be based on MPN 410152 and comparison with the removed part.

How can I tell spacing is the issue rather than bearings or bushings?|If after assembly there is axial play or parts don’t seat consistently, and the ring shows wear marks or deformation, it’s often one of the main suspects. In service, the whole set of mating parts is assessed.

Can I “patch” a worn ring by adding an extra washer?|That’s a temporary and risky solution because it changes the assembly geometry. In pumps, it’s better to restore factory fit using the correct part with the proper profile.

What should I check when replacing the spacer ring?|Contact surfaces, guiding elements, bushings/washers, and overall alignment of the assembly. If other parts are worn, a new ring may not solve the issue for long.

[/faq]