Contact Bearing 7306 B TVP FAG

Bearing 40704 is an angular contact ball bearing (Schrägkugellager) size 7306, used in the BG100 motor of the Kranzle quadro TST pressure washer. The full designation 7306 B TVP FAG specifies the construction: letter B denotes a 40° contact angle – larger than the standard 25° in bearings of this series, increasing the ability to carry axial loads. TVP denotes a ball cage made of plastic (fibreglass-reinforced polyamide) instead of metal – lighter and quieter running at high motor speeds. FAG is the bearing manufacturer.

Application

The bearing is mounted on the shaft of the BG100 motor, supporting it and carrying both the radial and axial loads generated during pump operation. The angular contact design with a 40° contact angle is appropriate for this mounting position – in the BG100 motor working with a piston pump, where axial forces from the drive mechanism act on the shaft, not just the weight of the rotor. The TVP plastic cage reduces internal friction and operating noise compared to metal cages at the speeds typical of the BG100 motor.

Replaced during motor repair – after identifying noisy operation, shaft play, or as part of a comprehensive quadro TST motor service.

Symptoms – when to replace

• Noisy motor operation – grating, squealing or knocking that changes pitch with rotation speed, intensifying once the motor warms up.
• Noticeable axial play on the motor shaft when moved by hand – the 40° contact angle of this bearing is critical for axial stiffness, and its wear shows specifically as play along the shaft axis.
• Heating of the motor housing in the bearing area beyond normal operating warmth.
• Visible discoloration, corrosion, or a melted or cracked plastic cage on disassembly – the result of overheating or bearing overload.
• Resistance or uneven rotation after removing the bearing from the housing and manually checking its operation outside the motor.

How to select the right part

Four parameters must match simultaneously: size 7306, contact angle B (40°), cage type TVP (plastic). Substituting the standard 25° contact angle (designation without letter B) reduces axial load-carrying capacity – in the BG100 motor this can lead to accelerated wear under normal pump operation.

The TVP cage (plastic) differs from a metal cage (e.g. designation M) in its operating characteristics at high speed – substitution is technically possible, but changes the noise and friction characteristics. When replacing, keep the same cage type unless you have a confirmed reason to change it.

Identify by reference number 40704 or the full designation 7306 B TVP stamped on the housing of the removed bearing. If the marking is illegible, measure the internal diameter, external diameter and width with a calliper – these dimensions confirm size 7306, but not the contact angle or cage type, which require a legible marking or comparison with documentation.

Compatibility

Component of the BG100 motor in the Kranzle quadro TST pressure washer. Verify the exact compatibility range by reference number 40704 and the full designation 7306 B TVP.

[faq]

How does angular contact bearing 7306 B (40° angle) differ from the standard 7306 (25° angle), and can they be interchanged?|The contact angle determines the proportion in which the bearing carries axial loads relative to radial loads – the larger 40° angle (designation B) increases axial load-carrying capacity at the cost of slightly reduced radial stiffness compared to the standard 25°. In the BG100 motor working with a piston pump, where axial forces from the drive mechanism are significant, the 40° angle is selected intentionally. Substituting the standard 25° is physically possible (same external dimensions), but changes the load distribution and may shorten bearing life under typical operation of this motor.

What does the TVP cage mean, and does its damage always force replacement of the entire bearing?|TVP is a ball-separating cage made of plastic – its function is to maintain even spacing between the balls and reduce internal friction. The cage is an integral part of the bearing – it is not available or replaceable as a separate component. Cracking or melting of the cage (e.g. from bearing overheating) disqualifies the entire bearing, even if the races and balls appear sound – a damaged cage will not maintain correct ball spacing and will quickly lead to further failure.

Can a FAG bearing be replaced with an equivalent from another manufacturer (e.g. SKF, NSK) with the same 7306 B TVP designation?|The designation 7306 B TVP is a dimensional and structural standard used by many bearing manufacturers – equivalents with an identical designation from other reputable manufacturers are generally interchangeable in terms of dimensions and operating parameters. Differences may concern manufacturing tolerances, cage material quality and factory grease. For a motor operating in demanding industrial or workshop conditions, it is safer to purchase a bearing from a trusted manufacturer with the full, matching designation – not merely a matching size.

How to check whether a bearing is worn if it looks fine from the outside and no noise is heard at low speed?|Remove the bearing and check its rotation by hand – it should be smooth, without sticking or grating throughout the full rotation. With an angular contact bearing, also check axial play by gently moving the inner ring along the axis relative to the outer ring – noticeably excessive play indicates wear of the race at the contact angle. Inspect the TVP cage for cracks, discoloration (a sign of overheating) or deformation. If in doubt, compare rotational resistance and play with a new bearing of the same designation.

[/faq]