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FDP Forum / Rock-it 88's - Keyboard Forum / Hammond Tonewheel Generator Bearing Replacement

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:52 PM   Edit   Profile   Print Topic   Search Topic

I produced these videos for another Forum, but some of you might be interested in old Hammond organs.

I have a 1951 RT-2 Console that I fixed up and was using until the Tonewheel Generator started acting up. It turned out one of the tonewheel bearings was worn out. Replacing a bearing plate requires almost complete dis assembly of the unit.

I used a bearing plate out of a Hammond spinet organ, which just so happens to have the same plates inside.

It's a series of about 10 videos taken during the repair process. They are all on YouTube.

Bad Tonewheel Bearing

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:53 PM   Edit   Profile   Print Topic   Search Topic

Parts donor dis assembly

Parts donor dis assembly

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:54 PM   Edit   Profile   Print Topic   Search Topic

A look at the pickups

A look at the pickups

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:55 PM   Edit   Profile   Print Topic   Search Topic

A look at the tonewheels

A look at the tonewheels

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:55 PM   Edit   Profile   Print Topic   Search Topic

A look at the tonewheel design

A look at the tonewheel design

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:56 PM   Edit   Profile   Print Topic   Search Topic

The bad tonewheel bearing

The bad tonewheel bearing

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:57 PM   Edit   Profile   Print Topic   Search Topic

Tonewheel Generator with bearing replaced

Tonewheel generator with bearing replaced

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:58 PM   Edit   Profile   Print Topic   Search Topic

Close look at the bad bearing

Close look at the bad bearing

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 04:58 PM   Edit   Profile   Print Topic   Search Topic

Loosening stuck pole pieces

Loosening stuck pole pieces

ECS-3
Contributing Member
**********

USA / Virginia

Oct 4th, 2015 05:00 PM   Edit   Profile   Print Topic   Search Topic

Re-assembly and initial output calibration

Re-assembly and initial output calibration

Ramblin Rhodes

Sportsman's Paradise

Doin' Bruin
Oct 9th, 2015 08:21 PM   Edit   Profile   Print Topic   Search Topic

This series of videos is absolutely amazing..!!
The technical expertise required to repair this antique is outstanding..
Kudos to ECS3 for restoring an iconic instrument...and sharing the knowledge needed for others that are as highly motivated to attempt such an endevour.l!!

Ramblin Rhodes

Sportsman's Paradise

Doin' Bruin
Oct 9th, 2015 08:26 PM   Edit   Profile   Print Topic   Search Topic

...can you tell me the symptoms that alerted you to the fact that one of the tone wheel bearings was bad..??
Was there noise in the output...???
...or just mechanical noise from within the console...??

ECS-3
Contributing Member
**********

USA / Virginia

Oct 10th, 2015 05:44 AM   Edit   Profile   Print Topic   Search Topic

The tonewheel generator started squealing, and two tones on the organ started running way below normal pitch. I looked up the two tones in the Hammond Service Manual and saw they were both on the same tonewheel. So I knew I had a problem with that tonewheel pair.

Old Hammonds squealing is not uncommon but normally when they are oiled the noises fix themselves after the oil has time to work itself thru the oil wicks to the bearings.

Once I got the generator out of the console and looked at the underside that's when I realized I had a serious bearing failure.

I'm hoping that series of videos can help someone else rescue another old Hammond console like I did.

ninworks
Contributing Member
**

Tennessee

Too Much GAS
Oct 11th, 2015 05:57 AM   Edit   Profile   Print Topic   Search Topic

You are far braver than I. I would never tackle something of that magnitude. I once had a M3 spinet that I removed the scanner to free it up and had to re-solder a couple of wires on the generator but that's as far as I'm going to go.

I love my RT-3 but if it got worn to that point I would either sell it or have someone else repair it.

ECS-3
Contributing Member
**********

USA / Virginia

Oct 11th, 2015 03:03 PM   Edit   Profile   Print Topic   Search Topic

Here's me clowning around in my basement after I got the console back together. It's connected to a modified Leslie 900U. I played the bass guitar part and the melody line on the RT-2 Console.

Youtube linkage

FDP Forum / Rock-it 88's - Keyboard Forum / Hammond Tonewheel Generator Bearing Replacement




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