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Base Alliance HD-73 Refresh

Discussion in 'CB Antennas' started by 357, Apr 10, 2018.

  1. 357

    357 Walkin' the dog

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    I will be posting some images and tips for doing some maintenance on the HD73.
    In particular the direction pointer potentiometer gear.
    I plan on flipping the metal gear so the contact is higher or lower.
    I have 2 hd73's, one came in a tower, one off ebay that has the stripped teeth on the aforementioned gear.



    IMG_2953.JPG IMG_2952.JPG IMG_2948.JPG IMG_2949.JPG IMG_2951.JPG IMG_2947.JPG IMG_2954.JPG
     
    #1 357, Apr 10, 2018
    Last edited: Apr 11, 2018
    Shadetree Mechanic and Marconi like this.

  2. 357

    357 Walkin' the dog

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    and there we have it...
    Line the little tit and the zero to reassemble


    IMG_2956.JPG
    IMG_2955.JPG
    IMG_2959.JPG
     
  3. 357

    357 Walkin' the dog

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    Clean the bearing races.
    Use dish soap and water, paper towel, sos pads and lots of elbow grease.

    IMG_2962.JPG
     
    murdog likes this.
  4. 357

    357 Walkin' the dog

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    Time to start lubing. Lay a bead of lithium grease in the "bowl" race and put in 50 ball bearings. (after you scrubbed them with carb cleaner and polished each one with paper towel.)

    IMG_2976.JPG IMG_2977.JPG IMG_2964.JPG IMG_2965.JPG IMG_2963.JPG IMG_2978.JPG IMG_2967.JPG IMG_2969.JPG

    Then put some grease on the gears, remember it isn't a 5 speed trans. or a 350 chevy, it only spins at 1 rpm for the most part, what I have is plenty.
    Then lay a bead on the internal gear race and the gears and lay it on top of the bearings, lining up the notch to the "tit".
    Put some grease under the full stop lever
     
  5. 357

    357 Walkin' the dog

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    Now the pain in the ass part.
    The potentiometer for the dirction needle needs to be alligned.
    When you line the notch in the gear ring, the pot needs to be all the way to the left or right to where it stops, then spin the motor gears by hand and while rocking the "pot" gear, keep checking for slack in it and rotate the ring gear so the slot lines up with the outside the the stop lever, lift the ring gear and rotate the pot gear so that its all the way full stop, then wire the rotor to the control box and start turning back the other way from where the full stop was on the pot. Keep going from the S all the way 360 to the other S on the control box.
    Slide the stop lever to the other full stop position and slowly inch the slot back to the tit, while rocking the pot gear to make sure it doesn't come to the end of its travel.

    It should line up again with the slot and the center of the stop lever, you get about a "tooth" of overshoot on the pot on each full rotation left then right, if you dont you got to lift the side of the ring gear and position the pot gear to give 1 tooth of overshoot.

    When you have gone full rotation both ways a few times and the needle is lining up and the pot gear isnt binding, put the to cover on.


    IMG_2968.JPG IMG_2980.JPG IMG_2979.JPG IMG_2970.JPG IMG_2968.JPG
    IMG_2983.JPG IMG_2971.JPG IMG_2989.JPG IMG_2992.JPG IMG_2990.JPG
     
    #5 357, Apr 11, 2018
    Last edited: Apr 11, 2018
  6. 357

    357 Walkin' the dog

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    Then lay a bead in the clamp ring race and put in the remaining 50 bearings.
    Lay a bead on top of the bearings and then put the ring in a open part of your table.

    IMG_2985.JPG IMG_2972.JPG IMG_2973.JPG IMG_2986.JPG

    *The top cover should already be on and aligned at this point.

    Now put the rotor in the center and lift the clamp ring up and align the bolt holes and start feeding bolts to it to keep the ring from falling or tilting and spilling bearings on the floor and under the stove.

    IMG_2987.JPG IMG_2974.JPG
     
    #6 357, Apr 11, 2018
    Last edited: Apr 11, 2018
  7. 357

    357 Walkin' the dog

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    Done. Do some final tests and tighten the bolts up tight.
    I did 2 of these today.


    IMG_2993.JPG
     
    #7 357, Apr 11, 2018
    Last edited: Apr 11, 2018
  8. 357

    357 Walkin' the dog

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    All the images.

    Code:
    https://imgur.com/a/kagrO
     
  9. BigJ373

    BigJ373 Member

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    turning the house around big time ! sweet
     
    357 likes this.
  10. Hurricane145

    Hurricane145 Well-Known Member

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    What did you use to clean up the outside of the rotor (if you did)? I have three of them to go through ...someday!
    I would like to clean up the outside of them as they look pretty grubby. You mentioned SOS pads for some internal parts. I hadn't thought of that for cleaning up the outside. It might work pretty well.
    The HD73 was only $100 when they came out so it was a good price at the time. Not a very strong rotor though for even the usual tribander antenna. They break a lot. That piece that your two white nylon or plastic gears that were stripped sit on breaks a lot. I think it is just a pot metal piece.
    Nice job on yours! Good tutorial!
     
  11. 357

    357 Walkin' the dog

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    Thanks! I didn't really clean the outside but that acid stuff for magwheels would probably get it looking good.

    73's
     
  12. Hurricane145

    Hurricane145 Well-Known Member

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    That sounds like another good idea. I would try that first. I get too stuck on media blasting, hot tanks and things like that which are more expensive to get done and not as readily available as your ideas.
     
  13. BigJ373

    BigJ373 Member

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    BRINE TIME!!!!!!!!!!!!!!!!!!!!
     
    357 and Shadetree Mechanic like this.
  14. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    Holy rotor goodness, how did I miss this? Good stuff!
     
  15. 357

    357 Walkin' the dog

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    still never got to use the rotor.
    Its just sitting here...
     
    Shadetree Mechanic likes this.

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