REVOX A77 - Replace capstan bearing

[@ScottGrammer]

Your English is just fine. Thanks for the video, I am rebuilding a B77 of my own, and may well need to replace these same bearings. Subscribed.

[@dchatz]

Thank you

[@WestCoastDP]

Good job. That locking slide pin is hard to get on. I found out that using thin nose pliers works great. Just pull the lever up and over the shaft with the pliers. Easy, peasy.

[@dchatz]

Thank you

[@berlewi]

Many thanks for making such a helpful and excellent video!! 🙏

[@lichtbild2740]

Thank you for sharing this ! I have to change my bearings as well … much appreciated

[@dchatz]

Welcome !!

[@garyspencer1711]

Nice Job Chatzman ! Excellent video and audio. We thank you for your hard work. Be Well.

[@dchatz]

Thank you Gary

[@ppeterso22]

Thank you! -getting ready to do this on my A77mkIII as the motor has a slight scraping sound in the bearing.

[@dchatz]

There is always the possibility that the motor has been out of specs after all these years and the tight tolerances are out of limits. If its so your motor might keep on making noises which are not from the bearing but from the shaft being able to move slightly front-back while turning. In that case the motor might need replacing. There are many for sale on ebay. Replacing the bearing is always a cheap and simple job that is worth trying. Don't forget to put thin oil on the front sintered bearing. Put a lot there. It might be totally dry.

[@ppeterso22]

@@dchatz thanks! Let’s hope it all works out. Both bearings have been oils so the front felt is damp with oil

[@ppeterso22]

@@dchatz thanks to your video, replacing the bearing wasn’t bad at all. As you said may happen the motor is noisy unless I tilt the unit back or forward. Should I replace the motor or just the shaft? Thanks

[@dchatz]

@@ppeterso22 i wish i new. I also don't have experience on things going wrong. Im not a technician, just a hobbyist. There is another video in my channel where i remove the whole motor if you need help how to do it but I don't know exactly where the problem might be. Mine is still noisy but I'll leave it like that for now. kzbin.info/www/bejne/gZazfaqHidNrfsk

[@pmscompany]

Your English is like of mine. Lol But my native is Spanish. But the more important is the context of video. Thanks for upload !!!

[@dchatz]

as long as all is understood its OK. Did you know that I have heard a lot that listening to greek or spanish others confuse the two? They say they sound the same to an outsider. Its because the accent is randomly put on a word. French is usually on the last, Italian on the before the last but greek and spanish is random. That is why.

[@haroon1957]

Great video. Motivates me to check my a77 mklll while I am in the recap phase!

[@dchatz]

Thank you. I am very happy to help and motivate others

[@michaelbentley4182]

Excellent!

[@dchatz]

Thank you

[@stevegeorge6131]

What do you use to bypass the AC two pin interlock ( when the unit is running outside of the case)

[@dchatz]

I use a simply 2-pole power plug. Either power plug or splitter can be used. Be careful not to connect electrically the 2 poles.

[@stevegeorge6131]

@@dchatz ...like a Eurostyle power plug?...I'm across the pond in New England

[@stevegeorge6131]

@@dchatz , thanks for your help too. I'm doing the Capacitor upgrade, belt install and end-of-tape resistor fix

[@dchatz]

@@stevegeorge6131 use any plug that fits. Any cylinder thing will do if it fits the diameter of the hole. Again DO NOT connect the 2 holes electrically. And if you use a metal cylinder dont touch it. It is connected to your house power.

[@stevegeorge6131]

@@dchatz Thanks. I opted to drill out the jumper rivets and install that bar back into the unit. I'm waiting on VU lamps now. End of tape lamps are in and new pinch rollers are in. I've also modded the first A77 with the resistor fix for R118

[@brotherspock8180]

Great video.

[@mariosvalavanides6547]

Hi there and thanks for the video. I am located in Athens, Greece, and own a Revox A77 mkIV and a Grundig tk46. I intend to get into a full service of the Revox and a repair of the Grundig (at a later stage). I am not a professional technician - just a hobbyist mechanical engineer. Would like to get into contact to exchange technical details/hints/good proactice etc.

[@dchatz]

@@mariosvalavanides6547 hi, send an email to [e-mail] with your info

[@totallysmooth1203]

What about the front bearing?

[@dchatz]

Front bearing is sintered. Just oiling with mobil dte heavy vg100

[@spitsini]

Great job ! Και το δικό μου θέλει!

[@dchatz]

Now you can do it yourself !!!

[@nagra-ivs5558]

What type of oil do you use ?

[@dchatz]

At first I used thin gear oil but after some time I saw a bit green residue which is a sign of corrosion on the copper sintered bearing (BAD-BAD-BAD). I asked others and was instructed to use the "Mobil DTE Oil Heavy ISO VG 100 Bearing Oil SAE 30". As they say that oil is also proposed by the service manual. So use this. Search it as in the quotes on ebay.