Cam 12,0

Cam 4102812 with an angle of 12°, made of aluminium, is a drive component of the Kranzle HD 12/130 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° 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 HD 12/130 pump. With each shaft rotation, the cam, set at a 12° angle, moves the pistons via the thrust bearing resting against its surface. The 12° angle determines piston stroke, and through that, the flow rate and pressure characteristics of the HD 12/130 pump.

Replaced during cam assembly repair – after identifying wear on the cam surface, damage to the thrust bearing, or as part of a comprehensive 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 or in the bearing pack.
• Damage to the thrust bearing combined with signs of heating on the cam – bearing seizure frequently causes secondary damage to the cam surface.
• Corrosion or mechanical damage to the aluminium body – particularly at points of contact with the steel components of the bearing pack in the presence of moisture.

How to select the right part

Two parameters must match simultaneously: the 12° angle and the HD 12/130 pump model. Identify by reference number 4102812 – the 41028 series numbering encodes the angle in the last digits of the number, allowing verification: 4102812 corresponds to a 12° angle.

Cam 4102812 (12°, HD 12/130) is not a substitute for the other cams in the 41028 series – neither cam 4102896 (9.6°, 1152 TS/TST) nor cam 410281175 (11.75°, 2160 TS/TST) – despite the shared numbering prefix. Model and angle must both match.

During disassembly, assess the condition of the bearing pack at the same time – both components work together and wear over a similar timeframe.

Compatibility

Cam for the Kranzle HD 12/130 pressure washer pump, angle 12°, aluminium body. Not a substitute for cams intended for other 41028 series models, or for cams from the AQ series (40523) or quadro/Profi series (40460/40473). Verify the exact compatibility range by reference number 4102812.

[faq]

How to identify early wear of an aluminium cam in the HD 12/130 model?|During disassembly of the bearing pack, examine the cam race in raking light – early aluminium wear appears as a dull, slightly concave surface at the bearing contact point, before distinct scoring develops. Check the thrust bearing rotation by hand – resistance or grating indicates damage to one of the components. Also assess the contact between the aluminium and the steel bearing pack components for galvanic corrosion, particularly if the pump was operated with leaking piston seals allowing water into the housing.

When replacing cam 4102812, must the bearing pack be replaced at the same time?|There is no such requirement – if on disassembly the thrust bearing rotates smoothly, without grating or noticeable play, it can be retained. In practice, the cam and bearing wear together since they operate in constant contact. If the pump has several seasons of intensive use behind it or was exhibiting vibration, it is worth replacing both components in a single disassembly – returning to an opened pump a few months later for the bearing alone is impractical.

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