Spacer Ring 14mm AZ

The 14 mm AZ spacer ring (for the piston guide) is a mounting component used in the pump’s piston-guidance assembly, where it provides the correct spacing and positioning of guiding parts. In servicing AZ-type pumps, this part is replaced during guide overhauls, when mating surfaces are worn, or when play and inconsistent piston positioning appear after reassembly.

MPN / reference: 43055
Reference dimension: Ø 14 mm

APPLICATION

The spacer ring is used in typical service work:

• setting spacing in the AZ pump piston-guide assembly,
• restoring correct fit of guiding components after dismantling,
• replacing a worn spacer element during pump refurbishment,
• service work related to the guidance system in K 1150 / K 1151 units (after confirming compatibility by part number).

SYMPTOMS - WHEN IT’S WORTH REPLACING

Consider replacing the ring when you notice:

• play in piston guidance or lack of stable seating of components,
• uneven operation of the guidance assembly caused by incorrect spacing,
• wear marks, scratches, or deformation of the ring after removal,
• difficulty reassembling the guide consistently and correctly positioning the pistons,
• recurring problems after previous service when worn spacer elements were left in place.

HOW TO CHOOSE THE RIGHT PART

Selection should be unambiguous:

• confirm the part is for an AZ pump and for piston-guide use,
• verify the manufacturer number: MPN 43055,
• check the reference dimension Ø 14 mm and compare geometry with the removed part,
• base selection on the service documentation of the subassembly.

In guiding assemblies, spacing affects alignment and wear - a part with a different profile can accelerate guide wear.

COMPATIBILITY

Select the ring based on MPN 43055 and compatibility with the AZ pump and the piston-guide assembly. Treat the K 1150-1151 note as an application area that must be confirmed by part number and comparison with the removed component.

[faq]

Why is this ring described as “for the piston guide”?|Because it works in the assembly that locates and guides the pistons. Its spacing and geometry affect alignment and whether the guide can be reassembled consistently without play.

What symptoms suggest wear in the guidance components rather than just the seals?|Most commonly: play, uneven mechanical operation, the problem returning quickly after seal replacement, or visible wear marks on guiding components after disassembly.

Is Ø 14 mm enough to select the correct ring for AZ?|No. It’s only a dimensional hint. The most reliable selection is by MPN 43055 and comparing the profile to the removed part, because different parts can share the same Ø but have different geometry.

Can I reassemble the guide with a worn ring “because it still looks OK”?|That’s risky. Even small spacing wear can introduce play or misalignment, which accelerates wear of pistons and guides and reduces repair durability.

What should I check together with the ring during a piston-guide overhaul?|The condition of guiding components, contact surfaces, any bushings/washers, and overall alignment after assembly. If other parts are worn, replacing only the ring may not be enough.

[/faq]