Ball Bearing 6206-2Z/C3

Bearing 40538 is a standard ball bearing with dimensions 30x62x16mm (designation 6206), used in the electric motor of the Kranzle pressure washer. The designation 2Z indicates a double metal shield on both sides of the bearing, protecting the rolling elements from contaminants and moisture. The designation C3 means increased internal clearance – a clearance class typically used in electric motors, where the shaft and housing expand thermally at different rates during operation; standard clearance under such conditions could lead to bearing seizure once the motor heats up.

Application

The bearing is mounted on the shaft of the electric motor of the Kranzle pressure washer pump, supporting the shaft and allowing it to rotate freely. The double 2Z shield provides basic protection against dust and moisture present in the washer's operating environment, although it does not replace full lubrication – the bearing has factory lifetime lubrication, sufficient for the entire service life under normal conditions. Increased C3 clearance is important in motors operating cyclically, with alternating heating and cooling.

Replaced during electric motor repair – after identifying noisy operation, shaft play, or as part of a comprehensive motor service combined with replacement of other wear components.

Symptoms – when to replace

• Noisy motor operation – grating, squealing or knocking that changes pitch with shaft speed, particularly intensifying once the motor warms up.
• Noticeable radial or axial play on the motor shaft when moved by hand – the bearing no longer guides the shaft stably.
• Heating of the motor housing in the bearing area beyond normal operating warmth – the result of increased friction from damaged rolling elements.
• Visible discoloration, corrosion or grease leakage on disassembly – indicating overheating or shield damage.
• Resistance or uneven rotation of the shaft after removing the bearing from the housing and manually checking its operation outside the motor.

How to select the right part

Three parameters must match simultaneously: size 6206 (30x62x16mm), shield type 2Z, and clearance class C3. A bearing without the C3 designation – with standard clearance – may operate correctly at lower temperatures, but with the heating cycle typical of a motor it risks seizure after prolonged operation. Do not substitute the clearance class without confirming that the specific motor does not require increased clearance.

The designation 2Z (metal shields on both sides) differs from 2RS (rubber seals) – switching between these variants changes the level of protection against contaminants and slightly alters frictional resistance. When replacing, keep the same shield type unless you have a confirmed reason to change it.

Identify by reference number 40538 or the full designation 6206-2Z/C3 stamped on the housing of the removed bearing. If the marking is illegible, measure the internal diameter, external diameter and width of the bearing with a calliper – these three dimensions unambiguously indicate size 6206.

Compatibility

Electric motor component for Kranzle pressure washers. Verify the exact compatibility range – including motor frame size (BG) – by reference number 40538 and the full designation 6206-2Z/C3.

[faq]

What does clearance class C3 mean, and will a standard bearing (without this designation) work equally well in a washer motor?|Class C3 means internal clearance greater than standard (C0/CN) – it compensates for thermal expansion of the shaft relative to the housing during motor operation. In electric motors, where the shaft heats up faster than the outer bearing housing, standard clearance can reduce to zero or turn into preload once heated – this leads to accelerated wear and bearing overheating. Using a C3 bearing in a position designed for this class is important for motor service life – do not substitute standard clearance without confirming that the motor design allows it.

Difference between a 2Z shield and a 2RS seal – can I use 2RS as a substitute for 2Z in this bearing?|A Z shield is a metal cover plate, lightly touching or close to the inner ring – it provides basic protection against large contaminants, but allows fine dust through and is not a complete barrier against moisture. An RS seal is an elastomeric contact lip seal, providing better protection against moisture and dust, but generating somewhat greater friction and rotational resistance. In motors operating at high speed, the small difference in RS friction can be thermally significant. If the original has 2Z, switching to 2RS is usually safe dimensionally, but assess whether the increased friction will affect the thermal characteristics of the specific motor.

How to check whether a bearing is damaged if it looks fine from the outside and no noise is heard at low speed?|Remove the bearing and check its rotation by hand, holding the outer ring and turning the inner one – it should be smooth, without sticking, grating or any perceptible unevenness throughout the full rotation. Also check radial play by gently moving the inner ring relative to the outer one – perceptible play in a new C3 bearing is normal, but excessive play or absence of play in a C3 bearing indicates wear or an incorrect class selection. If in doubt, compare rotational resistance with a new bearing of the same designation.

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