Cam 9.5

Cam 4052395 with an angle of 9.5° is a drive component of the Kranzle AQ series pump, designed for the electric motor version. 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 9.5° 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 electric-motor-driven AQ pump. With each shaft rotation, the cam, set at a 9.5° angle, moves the pistons via the thrust bearing resting against its surface. The 9.5° 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 9.5° angle is a critical parameter – do not select a cam by washer model alone without confirming the angle. AQ pumps may be fitted with cams of different angles depending on version and application – installing a cam with the wrong angle changes the pump characteristics.

The designation "for electric motor" indicates that before ordering 4052395 it is necessary to confirm that the pump is driven by an electric motor – the 9.5° angle alone is not a sufficient selection criterion.

Identify by reference number 4052395 and the 9.5° angle. During disassembly, assess the condition of the bearing pack at the same time – these components work together and wear over a similar timeframe.

Compatibility

Drive component for Kranzle AQ series pressure washer pumps with electric motor, cam angle 9.5°. Verify the exact compatibility range by reference number 4052395.

[faq]

How to distinguish whether pump vibration is caused by the cam or by the thrust bearing of the bearing pack?

During disassembly, examine both mating surfaces – the cam and the bearing – in raking light. Seizure, scoring or dull wear marks on the cam indicate cam wear. Grating, resistance when turned by hand, or play in the bearing itself indicate bearing wear. Assess these components together – wear of one accelerates degradation of the other, and replacing only one while the other is worn quickly leads to a repeat service.

How to identify the 9.5° 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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