Piston Spring Seat Washer 18mm

Washer 41034 is a thrust element of the piston spring assembly in the Kranzle pressure washer pump, identified by the 18mm dimension. It sits on the cylinder side as the seat for the lower coil of the piston spring – analogous to washer 40513 (ø32mm) in a different pump series. Despite the identical 18mm dimension in the name, it is not a substitute for spring pressure disc 40454 (18mm) – the pressure disc sits on the piston side, the washer on the cylinder side. These are two different components in the same assembly sequence, differing in position within the assembly and in function.

Application

The washer is mounted in the cylinder seat of the pump head as the first component in the piston spring assembly sequence: washer 41034 rests against the bottom of the cylinder seat, the piston spring sits on it, the pressure disc sits on the spring, and the whole assembly is held by the piston secured with a retaining ring. The washer is a stationary component – it does not move during piston operation. It prevents direct contact between the lower spring coil and the head material, distributing the spring load across a larger seat surface.

Replaced during pump head service – when dismantling the piston assembly or replacing the piston spring. Based on the numbering sequence, it likely works together with spring 41033 (3.4x36x58mm).

Symptoms – when to replace

• Visible corrosion, pitting or surface deformation – a mark from the lower spring coil indicating pressure concentration.
• Washer seized in the cylinder seat – cannot be removed without forcing, the result of corrosion at the contact point with the head material.
• Washer loose in the seat – the spring is not centred, operates at an angle and loads the piston unevenly.
• Deformation or cracking of the edge – particularly in an aluminium head, where galvanic corrosion at the contact point with a steel washer can initiate damage.

How to select the right part

Identify by reference number 41034. The 18mm dimension in the name may refer to the piston diameter or the seat dimension with which the washer works – measure the removed washer with a calliper before ordering and compare with the actual dimensions of the component.

Three components in this family have "18mm" in the name and may be confused when purchasing: pressure disc 40454 (18mm, piston side), washer 40513 (ø32mm, cylinder side for a different series), washer 41034 (18mm, cylinder side). During disassembly, mark the position of each component before removal – the assembly sequence is the only reliable identification point when dimensions are similar.

When replacing the washer, assess the condition of piston spring 41033 and the pressure disc at the same time – all three components work together and wear at a similar rate.

Compatibility

Service part for piston pumps of Kranzle pressure washers. Likely works with piston spring 41033 (3.4x36x58mm) – verify this association on the disassembled pump. Not a substitute for pressure disc 40454 (18mm) or washer 40513 (ø32mm). Verify the exact compatibility range by reference number 41034 and the 18mm dimension.

[faq]

How to remove washer 41034 from the cylinder seat if it is seized?

Soak the contact area with penetrating fluid and wait several minutes.

[/faq]