Description
Pair of new motor bearings for the cassette decks using motor type MMX-5D2RSC (part # 8400101) in the following Bang & Olufsen models:
Beocord 6000
Beocord 6002
Beocord 8000
Beocord 8002
Beocord 8004 (HX-PRO)
Beocenter 5000
Beocenter 7000
Beocenter 7002
Beocenter 7007
Beocenter 7700
If the original bearings are renovated properly in time (before the motor starts running uneven or rough, starts whining or screeching, starts slowing down intermittently, starts running warm and becomes unable to keep correct speed) they should be able to perform fine for yet a lot of years.
If, however, the motor ran with dry oil or no oil at all, even for only a brief moment (and it’s usually first when things no longer runs fine that owners first begin to think about it), it’s fairly safe to say, that the delicate bearing bronze material with the pores containing the essential oil will have been damaged. The soft material will have been “smeared out” and the pores containing the oil will be closed. This typically results in audible wow and flutter (speed fluctuations).
In severe cases of dried lubricants, the motor can be difficult to rotate by hand or have seized altogether.
Bearings damaged by running with dry – or no – lubricants usually cannot be rescued.
Even a fresh oiling will in these cases only make the motor run fine for a short time, – perhaps a few days, – perhaps merely an hour or two.
Any attempt to polish or sand the running surfaces of the bearings will only add to the damage in that it will smear out more material and clutter up pores with debris.
The only “guaranteed” solution is to replace the bearings.
The safe solution is always to fit new bearings.
This is a set containing both bearings needed.
Custom manufactured by Danish Sound Parts, these bearings are direct replacements for the original parts.
The bearings are pre-oiled (impregnated) and ready to fit. They will arrive oily and should not be wiped or dried before fitting.
It is recommended to clean the motor spindle using a soft lint-free cloth with isopropanol alcohol to remove fingerprints and remains of old lubricants before fitting in the new bearings.
Note:
The job of replacing the bearings is for a skilled DIY’er or tech person.
Note:
It is perfectly normal, that new bearings may need a run-in period in order to build up an even oil film, settle their position and adapt to the spindle.
MP-027
