Bearing 6205 2Z C3 SKF

Sealed ball bearing, fitted in the BG90 motor on the B side (opposite the fan and coupling). Widely used across many Kränzle models with this motor type.

Application

The bearing supports the motor shaft on the B side, working together with the A-side thrust bearing (7304 BEP) on the opposite end. It ensures smooth shaft rotation and carries the radial loads generated during BG90 motor operation.

Symptoms – when to replace

• Audible rumbling or squealing from the motor during operation, worsening over time.
• Noticeable play in the motor shaft when the fan is moved by hand after removing the cover.
• Motor vibration transmitted to the unit housing, not present on a new machine.
• Overheating of the motor housing near the bearing during extended operation.

How to choose the right part

Selection is based on reference number 43317 and the bearing designation SKF 6205 2Z C3 – the same catalog number is used across many different Kränzle models with the BG90 motor, regardless of the single-phase or three-phase version.

When replacing the B-side bearing, also check the condition of the A-side bearing (7304 BEP, 41.027) – uneven wear on one side often accelerates wear on the other bearing.

[faq]

Does the same bearing fit regardless of whether my model has a single-phase or three-phase motor?|Yes, the B-side bearing is identical in both BG90 motor variants – differences between the versions involve other components (stator housing, rotor, switch), not this bearing.

Do both bearings (A and B) need to be replaced at once, or can just one be replaced?|They can be replaced individually if only one shows signs of wear. However, on a motor with long service life, it's worth assessing both sides while it's already dismantled, to avoid taking the motor apart again soon after.

How can I confirm my model actually has a BG90 motor before ordering this bearing?|The most reliable way is to compare the removed bearing directly or check the marking on the motor's nameplate – reference number 43317 is confirmed widely enough, though, that if in doubt it's simplest to just physically measure the bearing (6205, 2Z series).

The motor still vibrates after replacing the bearing – what else should I check?|Check the condition of the cooling fan (Lüfterrad BG90) and its mounting, as well as rotor balance – persistent vibration despite a new bearing rarely comes from the bearing itself, more often from another rotating component.

[/faq]