Sharp GF-9797 Cassette Motor Disassembly

Another screechy Sharp GF-9797 motor. Might have to be used in a Sharp GF-9191.
I ended up oiling the bearings with machine oil...sparingly. The motor pulley seemed to have been glued on. It was removed with a heat gun, which took a few minutes. I only attempted to take the motor apart as a last resort, since I was not sure that I would be able to put it back together again. I have tried out the motor, but have not yet put the motor pulley back on permanently. Care must be taken not to bend the contacts.
Tool and materials used: machine oil, needle nose pliers without teeth (2 spoons could also be used to remove the pulley), a screwdriver, and a toothpick. Hot glue or all-purpose glue will probably be used to put the motor pulley back on.

[@eddysokoloff8738]

Fascinating/I use cassette recorders and always wondered how a motor looked like. Thank you.

[@OldSchoolElectronics]

Thanks, for your kind words and for watching.

[@JamesE707]

Well done on getting that back together! The tricky bit was not to let the magnet pull too fast on re-assembly.

[@OldSchoolElectronics]

Thanks for watching and your kind words! Right, that was kinda tricky.

[@stefanBEAR98]

What is that hump on the back contacts brushes called. I mean the part that usually flakes off with age? Is that also called brushes.

[@OldSchoolElectronics]

the black part (carbon) that presses on the commutator?

[@Combattoino]

Good share. What's the Working tension (Volts) of this motor?

[@OldSchoolElectronics]

Thanks for commenting. I think this was 15 volts DC. I don't have the unit any longer, but I think it took 10 1.5 volt batteries.

[@Combattoino]

Thanks

[@tveasy5172]

11,7 v dc

[@HNKaan]

thanks for sharing

[@OldSchoolElectronics]

Thanks for watching.

[@Abhishek99588]

Sir how much RPM is this motor

[@OldSchoolElectronics]

I don't have this player any more, but I thought it was 2400 rpm--on average. Since it used a mechanical governor, speed wouldn't be constant, so the speed would be held on average. The contacts constantly open and close.

[@Abhishek99588]

@@OldSchoolElectronics okk sir thanks for information

[@pliedtka]

The old ones, like this one, are made much better than units made after mid 1990s. Had a few with bearings gone and nothing could be done.

[@OldSchoolElectronics]

Right, the recorders got uglier and cheaper.

[@Rainbow__cookie]

MY motor had brunt up :(

[@OldSchoolElectronics]

Wow, sorry that happened!

[@Rainbow__cookie]

@@OldSchoolElectronics yeah i need to replace it do they still make cassette motors 🤔

[@OldSchoolElectronics]

Hmm...I normally wait until I find a donor unit. Otherwise hard to get. I know sometimes sellers (eBay) in China sell 12 volt motors they call audio motors. But it would take some research. In the old days you could always get an exact replacement, but those days are gone.