Clutch How do I remove the clutch for replacement?

Discussion in 'Transmission / Drivetrain' started by Irish John, Sep 16, 2009.

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  1. Irish John

    Irish John Guest

    I'm trying to take a good clutch out of a bust HT and use it in a good 5 year old Grubee motor that needs a new clutch cos it's worn out.
    Can anyone tell me how I get the big gear wheel with the clutch pads on it off the shaft so I can put it on the good engine. I've attached pics showing what needs to be removed. Grateful for any help here.

    Attached Files:

  2. I don't have experiance with this particular clutch, but it looks like you should be able to get a couple of flat screw drivers/flat pry bars 180 degrees apart and gently pry it off wiggling it side to side. There doesn't seem to be room to get the jaws of a wheel puller behind it and if it is really tight it looks fragile enough that a wheel puller would bend or crack it. I'm not sure but it might warp if you heated it with a torch. Others will have experiance with this.
  3. Al.Fisherman

    Al.Fisherman Active Member

  4. biken stins

    biken stins Member

    A picture is worth a thousand words.
    Your a wise man Al.Fisherman. Good Idea !
  5. Irish John

    Irish John Guest

    Thanks, I used the puller tool to get it off and I've mounted it on the other good old Grubee HT. The hole in the middle was a bit narrower and I had to file it larger to get it to slide onto the shaft plus the shaft key was a stright piece of key and not a woodruff key. The differences between the 5 year old Grubee and the modern ZBox engine I robbed the part from is noticeable - mainly the quality of the old model Grubee is superior but you see what a nice little design these motors are and I feel sad that they are all built so badly that you can only get a short life out of them. The most recent ZBox engines I have been involved with have an appalling record which I'll tell you.
    Out of 9 HT motors in last 12 months - one made it to 8 weeks, one made it to 6 weeks and seven didn't make it to 4 weeks. They all had catastrophic failure - mostly the top or bottom end needle bearings but one had the chrome cylinder lining flake off. That is a 100% total failure rate.
    I do not miss those ZBox motors - they have become total junk and the supplier says nobody complains which is a downright lie.
  6. f4lloutdiablo

    f4lloutdiablo New Member

    Irish john how did you manage to remove the screw on the small bevel wheel??
    I am currently tying to remove mine and have been failing:(
  7. Irish John

    Irish John Guest

    That's the little grub screw on the clutch plate I think you are referring to. You might br having difficulty undong it because it is locked up against the plate holding flange that it prevents from coming undone, Have you tried tapping that either clockwise or anti-clockwise to allow the screw room so you can unscrew it. It is really only held in place by a few treads the thickness of the clutch plate so it shouldn't be hard to unscrew. Use a long handled screwdriver of the right size for the phillips head screw,
    Last edited by a moderator: Sep 20, 2009
  8. Fletch

    Fletch Member

    How did you get the retainer nut off? If I turn the nut with a 19 wrench, it just rotates the clutch and drive sprocket. I've put the removal tool on the sprocket really tight but it just ends up unscrewing itself as I turn the nut because they both thread the same way. It feels like there should be an obvious answer I'm overlooking? If I had a way to hold the 3 shafts on the clutch in place that would work, but I can't figure how.

  9. DuctTapedGoat

    DuctTapedGoat Active Member

    Leave the clutch engaged and try again.

    (When you pull the lever, you disengage the clutch.)
  10. Fletch

    Fletch Member

    I know ;). What I'm talking about is in this attached pic. You can't turn this nut without turning the drive sprocket. You can't engage the clutch because the plate and everything is already off. What I ended up doing which worked great, was wrapping the chain around the drive sprocket and then sticking a small screw driver through the middle of the top and bottom links to hold it in place. I think this should be posted somewhere if it's not because I couldn't find it.

    Attached Files:

  11. DuctTapedGoat

    DuctTapedGoat Active Member

    Ohhh. Yeah, a chain whip is basically all you need. Good stuff figuring it out!
  12. happycheapskate

    happycheapskate Active Member

    or you could wrap a flathead screwdriver in electrical tape, and jam it in between the gears to stop rotation. Try using a big flathead screwdriver (stubby type short one) and a vice grip on the screwdriver. Push down and turn, now you should have it.
  13. relaxxx

    relaxxx Member

    This is where I'm stuck.

    I started getting this bad scraping/rattling sound from my clutch so I'm taking it apart to have a look. My big friction pad plate gear has some play to it, not sure if it's supposed to be like that. I can't get the nut in the smaller hub part off, it moves the drive chain and rear wheel. I'll try to lock up the chain with some wire or something.

    I also don't have that extractor thing... What else to expect? Am I even on the right track??

    I just uploaded a video of me wiggling the clutch:
    Last edited: Jul 14, 2012
  14. Ace2

    Ace2 Guest

    how were you able to wiggle the clutch?