Pump Cam 10.8

Cam 40460108 with an angle of 10.8° is a drive component of the Kranzle pressure washer piston pump. Mounted on the main pump shaft, it converts rotary motion into the reciprocating movement of the pistons. The 10.8° angle defines the cam geometry and directly determines piston stroke – and through that, the flow rate and pressure characteristics of the entire pump.

Application

The cam is mounted centrally on the main pump shaft, between the bearing and the cam disc. With each shaft rotation it moves the pistons along the path defined by its angle – the greater the angle, the longer the piston stroke for the same shaft geometry. The 10.8° cam produces a longer stroke, which translates into a higher pump flow rate with the corresponding pressure characteristic.

Service part replaced during cam assembly repair – after identifying wear on the cam surface, cracking, roller bearing seizure, or as part of a comprehensive pump drive overhaul.

Symptoms – when to replace

• Vibration or irregular pump rhythm that is not resolved by replacing seals or valves – suggesting wear of the cam working surface or imbalance following seizure.
• Visible signs of seizure, scoring or pitting on the cam race – where the roller bearing contacts it. Even shallow race damage translates into uneven piston movement.
• Play on the shaft with the cam fitted – cracking in the area of the mounting bore or wear of the tapered surface, if the cam is tapered-fit.
• Damage to the cam roller bearing combined with signs of excessive heat on the cam itself – bearing seizure frequently causes secondary damage to the cam race.
• Replacement as part of a set – if one component of the cam assembly shows significant wear after extended use, the remaining components are usually in a similar condition.

How to select the right part

The cam angle is a critical parameter – do not select a cam by shaft number or washer model alone without confirming the angle. Kranzle 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 and can lead to motor overload or insufficient pressure.

Identify by reference number 40460108 and the 10.8° angle. During disassembly, look for the angle marking on the cam itself – usually stamped or engraved on the side surface. If the marking is illegible, the angle can be measured geometrically after removal, but this requires precision.

When replacing the cam, assess the condition of the roller bearing, cam disc and washers at the same time – these components work together and wear over a similar timeframe.

Compatibility

Drive component for the piston pump of Kranzle pressure washers equipped with a cam assembly at 10.8°. Verify the exact compatibility range by reference number 40460108 and the 10.8° angle.

[faq]

What is the practical difference between a 10.8° cam and, for example, an 8.0° cam (4005580) – can they be used interchangeably?|They cannot be used interchangeably. A larger cam angle – 10.8° instead of 8.0° – means a longer piston stroke for the same shaft. This results in a higher pump flow rate and a different pressure characteristic. Fitting a cam with a different angle than specified for a given pump changes its operating parameters and can lead to motor overload or operation outside the design range. Replacement is only possible with an identical angle.

How to identify the cam angle without removing it from the shaft?|Without disassembly this is difficult or impossible – the angle marking is usually on the side surface of the cam and may not be visible with the bearing or disc fitted. When servicing an unknown pump for the first time, the only reliable method is disassembly and reading the marking. If you have the technical documentation or the nameplate of the washer with the full model number, the cam angle can be determined from the Kranzle parts catalogue for that model.

How to identify early cam race wear before vibration appears?|During disassembly, examine the cam race in raking light – early wear appears as a dull, slightly concave track at the roller bearing contact point, before visible scoring develops. Also check whether the roller bearing rolls evenly along the race when turned by hand – resistance or grating during free rolling indicates damage to the race or the bearing itself. Assess both components together, as wear of one accelerates degradation of the other.

Can the cam be reconditioned by grinding the race, or is replacement necessary?|Grinding the cam race is technically possible, but it alters the cam geometry – particularly at a precisely defined angle of 10.8°. Removing material from the race can change the effective cam angle, and through that, the piston stroke. For a component that determines the operating parameters of the entire pump, reconditioning by grinding is impractical – the tolerances are too tight and the risk of altering the pump characteristic is too high. With a damaged race, replacement with a new cam 40460108 is the safer option.

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