Nurníkový piest 12mm L-74,1mm

The 12 mm piston (plunger) for the Junior series is a working part of a high-pressure pump, responsible for generating pressure in the system. In service, it is replaced when the working surface is worn, mechanically damaged, or during regeneration of the pump section.

MPN / reference: 43.083

APPLICATION

The plunger is used in service work on pumps in Junior series devices, including:

• replacement of a worn piston/plunger in the working section of the pump,
• pump regeneration after longer operation,
• repairs after pressure parameter drops,
• overhauls in which elements cooperating with seals are verified.

SYMPTOMS - WHEN IT IS WORTH REPLACING

Typical symptoms indicating wear or damage of the plunger:

• drop in working pressure and reduced washer performance,
• jet pulsation and unstable operation of the system (after excluding nozzle/valves),
• leaks in the pump section related to accelerated seal wear,
• unusual friction or noise from the pump area,
• scratches, pitting, or damage of the working surface after disassembly.

HOW TO CHOOSE THE RIGHT ELEMENT

Selection of the piston/plunger should be done precisely, because the element works within tight tolerances:

• by MPN / manufacturer reference: 43.083,
• by working size: 12 mm,
• by comparison with the disassembled part: check diameter, length, and geometry of the element.

Precise matching is crucial for tightness of the pump section and durability of seals.

COMPATIBILITY

The element is described as intended for Junior series devices.
For safe selection, compatibility should be confirmed by MPN 43.083 and pump documentation/parts list. Selection solely by the general “12 mm” description without reference verification is not recommended.

[faq]

Does the 12 mm plunger fit every Junior series version?|Yes. The most reliable method is to confirm compatibility by MPN 43.083 and comparison with the part from disassembly.

When replacing the plunger, is it worth replacing pump seals immediately?|In service practice, often yes, because worn seals can shorten the service life of a new plunger and worsen system tightness.

Can a replacement be used instead of the original part?|A replacement can be considered only with full compatibility of dimensions, geometry, and intended use. In pump working elements, tolerances are critical, therefore the reference point should be MPN and technical documentation.

[/faq]