Cotter Pin 3mm

Cotter pin 401151 secures the pressure washer wheel on the axle against sliding off. Once inserted through the hole in the axle, the arms spread out and lock the wheel in its installed position. The 3mm diameter corresponds to the hole in the wheel axle used among others on Kranzle Quadro, Therm C, and Therm CA pressure washers.

Application

Component installed in the hole of the pressure washer drive wheel axle. The spread arms of the cotter pin prevent the wheel from sliding off the axle during use and transport of the washer. The part is not visible during normal operation – it only becomes apparent during wheel removal or when damaged and the wheel shows excessive axial play.

Symptoms – When to Replace

• The wheel slides off the axle or has noticeable axial play – the cotter pin is broken, bent, or missing.
• The cotter pin is bent to the point where it no longer holds the wheel in position.
• The cotter pin is damaged during wheel removal.

How to Select the Correct Part

Selection is based on the 3mm diameter and reference number 401151. The cotter pin diameter must match the hole in the wheel axle – a pin that is too thin will move within the hole and will not secure the wheel effectively. If you are replacing the cotter pin without removing the entire axle, visually check the condition of the hole in the axle – a worn hole requires axle replacement, not just a new cotter pin.

Compatibility

Kranzle catalogue part. Fits among others Kranzle Quadro, Therm C, and Therm CA pressure washers equipped with drive wheels on an axle with a 3mm hole. Verify compatibility with other models using reference number 401151.

[faq]

Does a standard 3mm cotter pin from a general hardware supplier fit as a substitute for 401151?|The 3mm diameter is a standard dimension, but the length and arm geometry can differ between manufacturers. A pin that is too short may not reach through the full width of the axle hole. Before purchasing a substitute, check the length of the removed cotter pin and compare it with the available variants.

What should be checked if the wheel still has axial play after fitting a new cotter pin?|Axial wheel play after replacing the cotter pin most commonly results from a worn hole in the axle or a worn wheel hub. The cotter pin prevents the wheel from sliding off, but it does not eliminate play caused by a loose fit of the wheel on the axle. In that case, check the diameter of the hub bore and the external condition of the axle.

Are cotter pins of the same diameter used on wheels across different Kranzle models?|No – depending on the washer model and wheel size, the axle may have a hole of a different diameter. Cotter pin 401151 with a 3mm diameter is correct for the Quadro, Therm C, and Therm CA models. Other Kranzle series may use cotter pins of different diameters – verify by reference number or by the removed part.

Can running the washer without a cotter pin for a short period damage the axle or wheel hub?|Under intensive use or frequent movement of the washer, a wheel without a cotter pin can gradually shift along the axle and wear out the hole in the hub or the edge of the axle. Extended use without a cotter pin typically ends with the need to replace the wheel or the entire axle, not just the cotter pin.

[/faq]