Spacer Ring 20mm AQ

The 20 mm spacer ring for the AQ pump is a mounting part used in the pump assembly to maintain the correct distance and positioning of cooperating components. In pressure washer service work, spacer rings are replaced when worn or deformed, or during a pump overhaul when proper alignment and fit must be restored.

MPN / reference: 40507
Reference dimension: Ø 20 mm

APPLICATION

The spacer ring is used in typical pump service work:

• setting spacing and positioning of components in the AQ pump,
• restoring correct fit after pump disassembly,
• replacing the spacer element during component regeneration/overhaul,
• eliminating play or incorrect positioning caused by wear of mounting parts.

SYMPTOMS - WHEN IT IS WORTH REPLACING

Consider replacing the ring when the following occur:

• noticeable play in the pump assembly after reassembly,
• uneven operation of mechanical components caused by incorrect spacing,
• wear marks, deformation, or cracks visible on the ring after removal,
• difficulty seating cooperating components correctly,
• 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 an AQ pump,
• verify the manufacturer number: MPN 40507,
• check the Ø 20 mm reference dimension and compare thickness and geometry with the removed part,
• base selection on the pump service documentation.

With spacer components, even a small dimensional difference can change fit and affect the service life of cooperating parts.

COMPATIBILITY

Select the ring based on MPN 40507 and compatibility with the AQ pump. Treat Ø 20 mm as a dimensional hint, but the primary identifier is the manufacturer number and comparison with the removed part.

[faq]

Why is a spacer ring used in the pump?|To maintain correct spacing and positioning of cooperating parts. This affects alignment, fit, and stable operation of the pump mechanics.

Can a worn spacer ring affect washing performance (pressure/flow)?|Indirectly, yes. If incorrect spacing causes play or improper mechanical operation, it can accelerate wear and degrade pump performance.

Can I choose the ring only by “Ø 20 mm”?|Not recommended. The safest method is selecting by MPN 40507 and comparing the geometry with the removed part, because different rings may share the same reference diameter but have different thickness or profile.

What should be checked together with the ring during an AQ pump overhaul?|Inspect cooperating parts: mating surfaces, bearings, bushings/washers, and the general condition of the pump mechanics—wear in one component often affects the others.

How to tell after assembly that spacing is correct?|The assembly should operate without excessive play, and parts should seat securely and repeatably. In practice, after reassembly, check correct fit and stable operation under load.

[/faq]