Cam Washer 62x85x4,75mm

In the pump drive system, the cam transfers rotational movement of the shaft into reciprocating motion of the pistons. Washer 40039 functions as a spacer and thrust element for the cam – it maintains the correct axial position of the cam and absorbs longitudinal forces generated during pump operation.

Application

The washer is installed in the drive cam assembly of the pump. The 62mm internal diameter defines the fit on the shaft or seat, and the 4.75mm thickness determines the axial clearance of the cam within the housing. The component works directly with the cam and adjacent drive elements – its condition affects the uniformity of piston movement and the durability of the entire assembly.

Symptoms – When to Replace

• Axial cam play – noticeable longitudinal movement when attempting to displace the cam by hand after disassembly.
• Cam runout during operation – uneven piston movement or pronounced pump vibration.
• Visible wear or pitting on the thrust surface of the washer.
• Deformed geometry – the washer does not lie flat or has altered thickness at contact points.
• Noise or knocking from the drive assembly with correct oil level and functional bearings.

How to Select the Correct Part

Selection is based on three dimensions simultaneously: internal diameter 62mm, external diameter 85mm, and thickness 4.75mm. A deviation in thickness directly affects cam axial play – a washer that is too thin will introduce play; one that is too thick may prevent correct assembly of the unit. When replacing, compare the new washer with the removed one, paying attention to uniform thickness and the condition of the thrust surfaces. Reference number 40039 is the most reliable basis for ordering the correct variant.

Compatibility

Kranzle catalogue part. Used among others in Kranzle pressure washers equipped with a pump featuring a cam drive system with the specified seat dimensions. Exact model compatibility depends on the pump version – verify using reference number 40039 or the service diagram.

[faq]

Is the 4.75mm washer thickness critical, or are deviations acceptable?|The thickness directly affects cam axial play. The 4.75mm dimension is a design value – a washer of a different thickness will alter the axial clearance and may introduce play or excessive tension in the drive assembly. In cam systems, axial play translates into uneven piston operation, so the thickness dimension should not be treated as approximate.

Does washer wear always manifest as axial play, or can there be other symptoms?|Not always. Uniform wear across the entire surface reduces washer thickness and introduces axial play. However, uneven wear – pitting or localised wear – can cause cam runout without any clearly measurable longitudinal play. During diagnosis it is worth checking both the axial play and the uniformity of the washer thrust surface after disassembly.

Should other drive assembly components be replaced at the same time as the cam washer?|It depends on the condition of the assembly. If the washer shows clear signs of wear, it is worth inspecting the cam, bearings, and oil seals at the same time – these components work together and their wear often progresses in parallel. Replacing the washer alone makes sense when the remaining components are in good condition and the washer is the sole source of the problem.

What can cause accelerated cam washer wear?|Primarily incorrect oil level or condition in the drive chamber – insufficient lubrication increases friction on the thrust surfaces. A second factor is contaminated oil containing metal particles, which acts as an abrasive. Operating the pressure washer with a damaged bearing also accelerates washer wear through uneven loading of the thrust surface.

Can washer 40039 be replaced with a washer of the same internal and external diameter but different thickness?|This is not recommended. The internal and external diameters define the fit and thrust surface, but it is the 4.75mm thickness that sets the axial cam clearance within the housing. Using a washer of a different thickness will alter the drive assembly geometry and may result in incorrect pump operation or accelerated failure of adjacent components.

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