Cam Roller Bearing - 60x85x7,5mm

The pump drive cam operates under varying radial loads – it is roller bearing 40040 that absorbs these forces and enables smooth rotation of the cam relative to the housing. The dimensions 60x85x7.5mm define the fit within the assembly: internal diameter 60mm, external diameter 85mm, width 7.5mm.

Application

The bearing is installed in the drive cam assembly of the Kranzle high-pressure pump. The cam converts the rotational movement of the shaft into reciprocating motion of the pistons – the roller bearing reduces friction in this assembly and transfers the radial loads generated during operation. The roller type is used where radial loads are high and axial space is limited. The 7.5mm width dimension fits directly into the construction of the drive housing.

Symptoms – When to Replace

• Noise from the drive chamber – humming, knocking, or whining that increases with shaft rotational speed.
• Noticeable runout or uneven cam rotation when turning the shaft by hand after disassembly.
• Elevated temperature of the drive housing in the area of the cam assembly after a short period of operation.
• Radial or axial cam play – movement perpendicular or longitudinal when checked by hand.
• Visible spalling, signs of corrosion, or seizure marks on the raceway or rollers after bearing removal.

How to Select the Correct Part

The bearing is selected based on three dimensions: internal diameter 60mm, external diameter 85mm, and width 7.5mm. All three must match the seat in the housing and the cam journal – a deviation on any dimension will prevent correct seating. Reference number 40040 is the basis for ordering the correct Kranzle catalogue variant. When replacing, also check the condition of the seat in the housing and the cam journal – damaged seating surfaces will shorten the service life of the new bearing.

Compatibility

Kranzle catalogue part. Used among others in Kranzle pressure washers with a pump featuring a cam drive system with a 60x85x7.5mm seat. Verify compatibility with a specific model using reference number 40040 or the pump service diagram.

[faq]

Can roller bearing 40040 be replaced with a ball bearing of the same dimensions?|This is not recommended. The bearing type – roller – is a design selection criterion, not merely a matter of availability. Roller bearings transfer higher radial loads than ball bearings at the same width. Fitting a ball bearing in place of a roller bearing risks overloading it and significantly reduced service life under drive cam operating conditions.

Can contaminated oil in the drive chamber damage the bearing, even though it contains factory-applied grease?|Yes. Bearings in the drive chamber operate in contact with gear oil – its condition has a direct effect on bearing durability. Oil containing metal particles or water acts as an abrasive and washes grease out of the spaces between the rollers. Regular oil changes in the drive chamber extend bearing service life.

How to identify that the noise is coming from the cam bearing rather than another drive component?|Bearing noise intensifies with rotational speed and is continuous in character – a hum or gentle knocking that increases uniformly. Irregular knocking or noise dependent on the phase of shaft rotation more often points to a problem with the cam itself or cooperating components. The most reliable diagnosis is to rotate the shaft by hand after disassembly – a worn roller bearing will noticeably crunch or show radial play.

Is it necessary to replace washer 40039 when replacing the cam bearing?|Not necessarily, but it is worth checking its condition while the assembly is open. Cam washer 40039 functions as a spacer and thrust element in the same drive assembly. If the bearing has seized or operated with play for an extended period, the thrust surface of the washer may have worn. Replacing both components simultaneously makes sense when the washer shows signs of uneven wear.

Can incorrect bearing seating during installation result in rapid failure?|Yes. A roller bearing must be pressed in evenly – installation at an angle causes uneven loading of the raceway and accelerated roller wear. Installation force must be applied to the ring being seated in the housing, not to the free ring. Striking the rollers or raceway directly during installation damages the bearing before its first use.

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