The 14mm AZL piston (plunger) is a working component of a high-pressure pump used in HD series and K 1152 units. It is responsible for generating pressure in the pump section, so its condition directly affects operating stability and system performance.
MPN / reference: 49.021
APPLICATION
The plunger is used in service work on pressure washer pumps, including:
- replacement of a worn piston/plunger in AZL-type pumps,
- regeneration of the pump working section in HD and K 1152 units,
- repairs after pressure parameter drops,
- pump overhauls during which seals and guiding elements are inspected.
SYMPTOMS - WHEN IT IS WORTH REPLACING
Typical symptoms of plunger wear or damage:
- drop in working pressure and reduced performance,
- jet pulsation and unstable pump operation (after excluding nozzle/valves),
- leaks in the pump section area related to accelerated seal wear,
- unusual noise/friction from the pump area,
- scratches, pitting, or damage to the plunger working surface after disassembly.
HOW TO CHOOSE THE RIGHT ELEMENT
Piston/plunger selection should be carried out precisely:
- by MPN / manufacturer reference: 49.021,
- by type designation: 14mm AZL,
- by comparison with the disassembled part: check diameter, length, and geometry.
Accurate matching is crucial for pump section tightness and seal durability - incorrect selection accelerates wear and worsens operating parameters.
COMPATIBILITY
The element is described as intended for use in HD series and K 1152 units.
For safe selection, compatibility should be confirmed by MPN 49.021 and the pump documentation/parts list. Selection based only on the “14mm AZL” description without reference verification is not recommended.
[faq]
Does the 14mm AZL plunger fit every HD and K 1152 version?|Not always. The most reliable selection method is confirmation by MPN 49.021 and comparison with the disassembled part.
When replacing the plunger, do seals also need replacement?|In service practice, often yes, because worn seals can shorten the life of a new plunger and cause leaks.
Can I use a replacement piston/plunger?|A replacement can be considered only with full compatibility of dimensions, geometry, and intended use. In pump working elements, tolerances are critical, so MPN and technical documentation should be the reference point.
[/faq]
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