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Hammond T-202 Broken Tonewheel Generator

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  • Hammond T-202 Broken Tonewheel Generator

    http://<a href="</a>

    Hi everyone I'm new to this forum. I recently got a Hammond T-202 that's been unused for years as far as I can tell. There haven't been any awful problems with it apart from the tonewheel generator (which is annoyingly quite important). When the motor turns on it makes a really loud grinding whirring noise (?) it's definitely not caused by the motor or the capacitor and I'm not sure what the issue is. I oiled it yesterday with Hammond Oil so I hope that could alleviate the issue. Please feel free to let me know if you have any ideas or solutions. Thanks!

    There's a youtube video of my tonewheel generator, just click the link above ^

  • #2
    Try this
    Last edited by tpappano; 04-27-2020, 02:03 PM.
    Tom in Tulsa

    Fooling with: 1969 E100, 1955 M3, 1963 M100, Leslie 720


    • #3
      The key statement is "unused for years". Translation is "not oiled for years". Oiling it yesterday will not yield results. It will need to be oiled liberally several times, possibly thinning the oil with Ronson lighter fluid. Better would be applying oil directly to the driest bearings, but patience may work as well. The run capacitor needs to be changed because it will fail as certainly as the sun rising tomorrow. The oil inside will leak or spew out.

      As we all know, the Hammond generator is a mass of precision bearings and gears lubricated by hundreds of cotton thread wicks resting in the trough at the top of the generator fed by the cups into which you had placed the oil. Gravity and capillary action. Be patient.
      Larry K

      Hammond A-3 System, Celviano for piano practice
      Retired: Hammond BV+22H+DR-20, Hammond L-102, M-3, S-6, H-112, B-2+21H+PR-40, B-3+21H, Hammond Aurora Custom, Colonnade.


      • #4
        1. Before you do ANYTHING, replace the motor run capacitor. It is filled with carcinogenic PCB's and is prone to exploding.

        2. Reiterating what others have said: PATIENCE. It will take days, if not weeks for the Hammond oil to work its way through the TWG.
        1971 T-202 with Carsten Meyer mods: Remove key click filters, single-trigger percussion, UM 16' drawbar volume correction. Lower Manual bass foldback.
        Korg CX3 (original 1980's analogue model).
        1967 Leslie 122 with custom inbuilt preamp on back panel for 1/4" line-level inputs, bass & treble controls. Horn diffusers intact.
        2009 Marshall 2061x HW Plexi head into Marshall 4x12 cabinet.

        1964 C3
        196x M-102
        197x X5
        197x Leslie 825


        • #5
          Hello and welcome! You have a nice organ there - oil it liberally and be patient, as others have commented. Once the magic oil has done its thing you will not look back and regret your patience!
          "Don't make war, make music!" Hammonds, Lowreys, Yamaha's, Gulbransens, Baldwin, Technics, Johannus. Reed organs. Details on request... B-)


          • #6
            I agree with everyone; the caveat being that you're undoubtedly going to have to tilt the generator up and deliver oil directly to as many bearings and bushing joints as you can reach. A Que tip dipped in Hammond oil will work, although you might want to find better quality swabs (possibly at a hobby shop) that won't leave stray cotton hairs. Let the TG set for a week and start it up again, and with it again tilted up you can zero in on any still-squealing bearings or bushings and again dab on the oil. DO NOT USE WD-40! As has been stated, this may take a while, so patience is important. After it's up and running oiling once a year is sufficient. Don't be like one of my elderly customers that thought it weekly oiling was required. What a mess that was. :) Best of luck!
            Over the years: Hammond M3, BC, M102, B3, four X77s and three PR-40s, a Thomas Electra and a Celebrity, three Fender Rhodes, Roland HS-10, HP-2000, HP-600, RD-600, JV-880, a thing made by Korg (?), two Leslie 910s, 122, 257, 258, 247, two 142s, and three custom-built Leslies. Wow, way too much money spent!