Cam 12,0

Cam 40523120 with an angle of 12.0° is a drive component of the Kranzle AQ series pressure washer pump. Mounted on the pump shaft, with a thrust bearing pack underneath it and the pump housing further down. The rotary motion of the motor turns the cam – its 12.0° angle generates the motion transferred through the bearing onto the pump pistons, converting shaft rotation into their reciprocating movement.

Application

The cam is mounted on the shaft of the AQ pump. With each shaft rotation, the cam, set at a 12.0° angle, moves the pistons via the thrust bearing resting against its surface. The 12.0° angle determines piston stroke, and through that, the flow rate and pressure characteristics of the pump. The component operates within the bearing pack, which provides correct seating and axial clearance on the shaft.

Replaced during cam assembly repair – after identifying wear on the cam surface, damage to the thrust bearing, or as part of a comprehensive AQ pump drive overhaul.

Symptoms – when to replace

• Vibration or irregular pump rhythm not caused by piston seals or valves – suggesting wear of the cam working surface or thrust bearing.
• Visible signs of seizure, scoring or dull wear marks at the contact surface between the cam and the bearing.
• Axial play on the shaft with the cam fitted – wear of the component at the mounting position.
• Damage to the thrust bearing of the bearing pack combined with signs of heating on the cam – bearing seizure frequently causes secondary damage to the cam surface.
• Replacement as part of the pack – if one component of the cam assembly shows wear after extended use, the remaining components are usually in a similar condition.

How to select the right part

The 12.0° angle is a relevant parameter, but not sufficient on its own for selection – AQ pumps may have several cam variants with an identical angle, differing in shaft mounting geometry. An identical angle does not guarantee interchangeability.

Identify by reference number 40523120. During disassembly, assess the condition of the bearing pack at the same time – these components work together and wear over a similar timeframe. If you are unsure about the pump drive type – verify on the disassembled machine or in the model documentation before ordering.

Compatibility

Drive component for Kranzle AQ series pressure washer pumps, cam angle 12.0°. Not a substitute for AQ cams with other angles (9.5° – 4052395, 10.8° – 40523108). Verify the exact compatibility range by reference number 40523120.

[faq]

The AQ series includes cams of 9.5°, 10.8° and 12.0° – does a larger angle always mean a "better" or "stronger" pump?|Not in a general sense – a larger angle means a longer piston stroke, and through that, a higher water flow rate at the same shaft speed. Whether this is "better" depends on the application: a pump with a 12.0° cam delivers more water, but at the same motor power this can mean a lower maximum pressure than with a smaller angle – the manufacturer matches the cam angle to the overall pump characteristic, not a single parameter. A 12.0° cam in a pump designed for 9.5° will not "improve" it – it will push the parameters outside the design range.

How to identify the 12.0° angle on the cam without disassembling the entire bearing pack?|The angle marking is usually located on the side or front surface of the cam and may not be visible with the bearing fitted. When servicing an unknown AQ pump for the first time, the only reliable method is disassembling the bearing pack and reading the marking on the cam. If you have the full pump or washer model number, the cam angle can be determined from the Kranzle parts catalogue for that model without disassembly.

How to identify early cam wear before noticeable pump vibration appears?|During disassembly of the bearing pack, examine the contact surface between the cam and the bearing in raking light – early wear appears as a dull, slightly uneven surface at the contact point, before visible scoring or wear marks develop. Also check whether the thrust bearing rotates evenly on the cam surface when turned by hand – resistance or grating indicates damage to one of these components.

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