(Topic ID: 266623)

Stern auto-plunger problems


By ShooterMcD

75 days ago



Topic Stats

  • 24 posts
  • 11 Pinsiders participating
  • Latest reply 71 days ago by Captainhook
  • Topic is favorited by 1 Pinsider

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    #1 75 days ago

    Seeking some help from all you excellent people. Something is up with my Ghostbusters auto-plunger. The mech is shared across multiple games and I’ve read some previous posts but I’m still struggling.

    The power is weak and will not make it up the ramp most of the time. About 20% of the time it launches fine. If it has to launch repeatedly during multi-ball, it will never have enough power and all balls collect in the lane.

    I’ve tried/investigated:
    Coil stop- not mushroomed. Also Hard to replace as it’s tied to the entire mech bracket.
    Coil - replaced. No change.
    Switch to trigger ball launch looks acts fine.
    Mech moves freely. Nothing is binding. Tried a different spring but no change.
    Tried multiple adjustments of ball contact points on the auto plunger with no change.

    Thoughts or recommendations?

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    #2 75 days ago

    Does the manual shooter rod work normally?

    Any chance you have a cliffy on the shooter lane. I’ve had the same problem when one gets out of alignment and the ball Hangs up on it.

    #3 75 days ago

    Thanks for the reply. No Cliffy on the shooter lane and shooter rod works fine. It’s not inhibiting the auto-plunge in any way.

    #4 75 days ago

    Check to see if both fingers of the auto plunge are hitting the ball squarely so it sends the ball out straight. Next check the lane guide of the ball launch to make sure it’s not effecting the trajectory and adjust if needed.

    #5 75 days ago

    Is the plunger bracket bent? I’ve got an AFMr on route. Same problem. Manually works fine. It’s smooth. Everything looks good. Then I notice the bracket is bent. Doesn’t seem like much but I straighten it by hand, and it makes the launch 100% of the time.

    #6 75 days ago

    yuriijos
    The fingers look good and I’ve tried to bend them a bit but no change depending on how they are aligned. Both are flush with the ball. Lane looks clear but I’m going to check that again.

    ryanbrooks
    You’re talking about the hanging bracket holding the coil and mech? Where would I look for a bend?

    Thanks guys. This game has been unplayable for the last week or two while I’ve been messing with this and waiting for the replacement coil (which didn’t help).

    #7 75 days ago

    I'm having the same problem on my Bksor. It worked fine until this lockdown we've had. I've taken everything apart cleaned it and replaced the coil sleeve, now sometimes it works sometimes it doesn't. The power is maxed out.

    #8 75 days ago

    I feel your pain. Maxing our the power doesn’t seem to make much of a difference. I even reflashed the code just to try something different.

    #9 75 days ago

    It really becomes a pain in the butt when you get six multi balls going.

    #10 75 days ago

    Check if shooter rod tip is centered in-between forks of plunger and not close to either side. You said you changed coil but did sleeve get replaced? Sometimes just cleaning inside the sleeve with 90% alcohol with a piece of scotch-brite pad and also the plunger rod will make a big difference.

    #11 75 days ago

    Check to see if there’s a crack in this anywhere.
    6B2E679A-51F5-4DA4-9518-B42DA3A10F10 (resized).jpeg. I’ve had a couple of these go from cracked to totally broken within a few games.

    #12 75 days ago

    Wow! What a pita this thing is. It’s a seriously finicky mech.

    I think I fixed it... after some bending and tweaking, what seems to have made all the difference is having the plunger force the ball about 1/8-3/4 ahead of the forks. The ball seems to have been coming back towards the mech a bit too far and sometimes conflicting with how the switch was being triggered.

    Hope this helps someone else out there.

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    #13 75 days ago

    SMH. Spoke too soon. Still having the same problem. It really seems like a coil power issue... going to investigate the switch further.

    #14 75 days ago
    Quoted from ShooterMcD:

    Wow! What a pita this thing is. It’s a seriously finicky mech.
    I think I fixed it... after some bending and tweaking, what seems to have made all the difference is having the plunger force the ball about 1/8-3/4 ahead of the forks. The ball seems to have been coming back towards the mech a bit too far and sometimes conflicting with how the switch was being triggered.
    Hope this helps someone else out there.[quoted image]

    Forks should be touching the ball and not as spread out, surprised your not having issues still but if it's working now then I would just leave it.

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    #15 75 days ago

    If you have any velcro with the sticky backing, you can cut a small piece and put it between bottom of playfield and where linkage contacts it making the forks not rest so far back like yours are. See the picture in post #11, area I'm talking about is to the far left of the circle in the picture.

    #16 75 days ago

    I had a similar problem on my Family Guy, that auto plunge would work erratic, the washer around the shooter rod next to the spring was beat up, it would bind on the rod and hold it in too far after the manual plunge and keep the ball too far ahead.

    #17 75 days ago

    Here's a picture of the area I'm talking about and the thread it came from.

    https://pinside.com/pinball/forum/topic/tech-help-please-acdc-autofire-plunger-getting-weaker-and-weaker

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    #18 75 days ago

    Ok. Thanks for all the help guys.

    I bent the forks in quite a bit and also used the felt/Velcro trick. Seems to back in business for now. I played about 3 full games without an issue.

    Still seems crazy to me the way this mech has so much slop in it and little tweaks can have such a big effect.

    #19 74 days ago

    I still can't get mine to work consistent.

    #20 71 days ago

    I was asked to post a picture. Hope this helps.

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    #21 71 days ago
    Quoted from ShooterMcD:

    Mech moves freely. Nothing is binding. Tried a different spring but no change.

    I had something similar happen. first time I looked everything checked out, worked perfectly. Then someone said it was messing again up a week later, I checked it and found a screw that was somewhat loose causing it to bind every so often.

    #22 71 days ago

    There was an older post about this problem, What is holding your shooter spring on?
    The problem on the old post was that the e-clip stuck out just enough that it impeded the auto plunger.

    #23 71 days ago

    There are two bushings on the pivot point. I had issues with mine, inspection showed the bushings were: 1. worn. 2. the other shot. Replaced them both and bought extra spares. 545-5352-00 NYLINER, 3/16" SHAFT, 545-5423-00 NYLINER, 1/4" SHAFT, 4L1-FF

    #24 71 days ago

    Adding velcro, bending the bracket so it touches the ball evenly on both sides seems to be working so far. Thank you.

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