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XJ650 RJ Seca 4ko Rear Drum Brake Sticking

Discussion in 'XJ Technical Chat' started by Rsk_141, Jan 5, 2018.

  1. Rsk_141

    Rsk_141 Member

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    Not sure what "nomenclature" means
    But I suspect your telling me off for callings things by different names.
     
    Last edited: Jan 6, 2018
  2. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    We keep saying the same thing over and over to you........
    So please start all over again, and tell us EXACTLY what is not turning, and what IS turning
     
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  3. Rsk_141

    Rsk_141 Member

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    I think we have a solution, K-Moe has sorted things out. I've been calling things the wrong name.

    Sorry! For the confusion,

    So it's the brake plate that will not rotate, (move) when spindle is tightened. This is Without the stabilizer bar connected.

    The Drum which is in the wheel moves freely.

    Gary.
     
    Last edited: Jan 6, 2018
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  4. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Ok, so--- that's NORMAL. As I said above, you need to loosen things back up so you CAN rotate it enough to hook up the stabilizer bar BEFORE you tighten the axle.

    Order of reinstallation:
    Slip spacer into hub
    Put brake assembly into the wheel
    Put wheel assembly back on splines
    Insert axle, washers, nut ( don't tighten yet)
    Rotate brake plate and reconnect stabilizer
    Re-connect brake rod/spring/barrel/nut/lever
    NOW tighten castle nut to draw axle in snug
    Tighten pinch bolt
    Don't forget cotterpin on stabilizer bolt
    Don't forget cotterpin on axle castle nut

    The axle WILL tighten up the brake plate so you can't move it. BUT-- I'll tell you, it WILL rotate ( and jam everything up) when you step on the brake IF YOU DONT HAVE THE STABILIZER HOOKED UP. SO.... that needs be hooked up FIRST, before tightening the axle.

    So finally, if the brake plate is hooked up to the stabilizer, the brake rod is hooked up, the axle is tightened, then the wheel should be able to rotate, nothing else should move. NOW you adjust the brake pedal travel.
     
    Last edited: Jan 6, 2018
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  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    I'm not telling you off. I'm clarifying so that we are all understanding which parts we're talking about. Without clarity, this problem can't be solved.
     
  6. Rsk_141

    Rsk_141 Member

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    Cheers Guys,
    Thanks for your help,

    Gary.
     
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  7. MattiThundrrr

    MattiThundrrr Not a guru

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    Nomenclature= names and terms. Fancy teacher talk for "words".
     
  8. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Update?
     
  9. MattiThundrrr

    MattiThundrrr Not a guru

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    Sure. It still means the same thing.
     
  10. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    ROTFLMAO
     
  11. Deecat

    Deecat Member

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    I am having trouble with the rear wheel of the bike I have been building which is an XJ750 in scrambler form


    I have put new bearings in the wheel and reassembled it as per the parts digram but when I tighten the wheel to the 77 lb the wheel is solid and will not turn.


    just to try it out I have put the old bearings back in, taken the break shoes but it still locks up.


    I have the spacer in between the two sets of bearing but the only thing that is not to clear is what function does the flange spacer perform, is it just to keep the large spacer central as mine just slides along the length of the tube.


    Unfortunately I took the wheel off about a year ago and can not remember where or which way the flanged spacer was placed .



    I have managed to strip and rebuild the engine and carbs using the excellent write ups on this site so I am hoping that someone can have an answer for this issue
     
  12. XJ550H

    XJ550H Well-Known Member Premium Member

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    all the spacers on the axle keep it from over tightening and locking up the wheel. the spacer flange spacer faces the brake plate helps with axle installation alinement the little spacer flange is mounted on the spacer and has changed sizes over the manufacture process .
     
  13. Deecat

    Deecat Member

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    |I have the tube spacer , a thin spacer which has a turned up edge which slides along the tube spacer and a thick washer that I have put on the outside of the drum .

    Should there be another spacer?

    I have also noted that when I tighten up the spindle the holes in the spindle go half way through the swinging arm near the pinch bolt so you can not get a rod in the hole to stop it moving round if it turns.
     
  14. XJ550H

    XJ550H Well-Known Member Premium Member

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  15. XJ550H

    XJ550H Well-Known Member Premium Member

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    upload_2018-1-17_13-44-2.png upload_2018-1-17_13-43-39.png

    see the 2 spacers (washers)
     
  16. Deecat

    Deecat Member

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    That is the drawing that I have been looking at and I have all the items on the drawing.

    I just can not figure out what is causing the wheel to nip up so tight .

    I did think that the replacement bearings might be slightly different but the same happens when I put the original ones back in.
     
  17. Deecat

    Deecat Member

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    I have built up a spare swinging arm and drive unit to try my wheel in and this also locks up so I am none the wiser.

    Would anyone happen to know if the thin spacer with the flange is supposed to pack out the bearing or just keep the large spacer central within the hub.
     
  18. XJ550H

    XJ550H Well-Known Member Premium Member

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    flange is just keep the spacer from falling flat in the wheel when the axle is removed,
     
  19. Deecat

    Deecat Member

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    Thanks that has solved that issue .I think I will put a shim behind the bearing just to see if that works .

    When I tighten the spindle to 76 lb the brake drum will not move in fact when I try to turn the wheel the spindle starts turning.
     
  20. rocs82650

    rocs82650 Well-Known Member

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    This is the issue. In pic #1 the cotter pin hole is too far through the castle nut. Hope this helps.

    Gary H.
     
    Last edited: Jan 18, 2018

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