EDIT : these comments are from one of the designing engineers of the listed turntables.
The following comment and discussion link* may be of interest to those with vintage Victor and Yamaha GT-2000 direct drive turntables if they haven't seen it already. there are 4 pages of comments re. GT-2000 turntable at his page - see the link at the bottom of each page :
https://37282.diarynote.jp/200708032337340000/
TRANSLATION :
"Today we will discuss maintenance and repair of direct drive motors.
First of all, regarding maintenance, I think you should basically do nothing. (Lol)
Some of you may be worried about replenishing the bearing oil and grease, but if you replenish oil other than the one used by the manufacturer at the time of shipment, the bearing may be damaged in the worst case. There is a possibility.
Even if it seems that there is almost no oil when the spindle is pulled out from the bearing, if oilless bearing is used for the bearing, it is included in the sintered porous bearing, so it may not be necessary to replenish oil There is.
This oilless bearing is used for Victor TT-101, TT-81, etc.
The GT-2000 uses a special thrust bearing (bearing that supports longitudinal load) so that it can withstand heavyweight turntables, so you should avoid disassembling it first.
This thrust bearing is called fluid dynamic bearing (FDB). A spiral groove is provided in the thrust and grease is collected at the center of rotation to support the load by the pressure. You can avoid it. The grease used in this part is a special one, and since many experiments have been repeated and the optimum one has been adopted, it may cause burn-in if it is replaced with something that is irrelevant.
By the way, Kenwood's KP-1100 and KP-9010 use this FDB for the radial bearing (bearing that supports the radial direction), and in this case the shaft is precisely grooved.
Probably the oil should be carefully selected for this bearing as well, so it is better to avoid replacing it with a non-shipping oil."
Any comments welcome.
*This link was originally posted by Jonathan Carr on Audiogon a few years ago.
The following comment and discussion link* may be of interest to those with vintage Victor and Yamaha GT-2000 direct drive turntables if they haven't seen it already. there are 4 pages of comments re. GT-2000 turntable at his page - see the link at the bottom of each page :
https://37282.diarynote.jp/200708032337340000/
TRANSLATION :
"Today we will discuss maintenance and repair of direct drive motors.
First of all, regarding maintenance, I think you should basically do nothing. (Lol)
Some of you may be worried about replenishing the bearing oil and grease, but if you replenish oil other than the one used by the manufacturer at the time of shipment, the bearing may be damaged in the worst case. There is a possibility.
Even if it seems that there is almost no oil when the spindle is pulled out from the bearing, if oilless bearing is used for the bearing, it is included in the sintered porous bearing, so it may not be necessary to replenish oil There is.
This oilless bearing is used for Victor TT-101, TT-81, etc.
The GT-2000 uses a special thrust bearing (bearing that supports longitudinal load) so that it can withstand heavyweight turntables, so you should avoid disassembling it first.
This thrust bearing is called fluid dynamic bearing (FDB). A spiral groove is provided in the thrust and grease is collected at the center of rotation to support the load by the pressure. You can avoid it. The grease used in this part is a special one, and since many experiments have been repeated and the optimum one has been adopted, it may cause burn-in if it is replaced with something that is irrelevant.
By the way, Kenwood's KP-1100 and KP-9010 use this FDB for the radial bearing (bearing that supports the radial direction), and in this case the shaft is precisely grooved.
Probably the oil should be carefully selected for this bearing as well, so it is better to avoid replacing it with a non-shipping oil."
Any comments welcome.
*This link was originally posted by Jonathan Carr on Audiogon a few years ago.
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