(Topic ID: 201798)

Tech: GTB Sky Jump drop target teardown & rebuild


By spinal

2 years ago



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  • 94 posts
  • 13 Pinsiders participating
  • Latest reply 2 years ago by spinal
  • Topic is favorited by 4 Pinsiders

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#13 2 years ago

Pro Football, Magnotron/Duotron, and Too Card should be pulled from the list as they dont have drop targets.

#14 2 years ago

If you plan to do many drop target banks a spring hook tool comes in handy for getting the springs back into place.

#23 2 years ago

Don't take the coil mounting bracket off of the main frame. It is factory set for the plunger to correctly bottom out to the coil stop. Once you take it off you will have to make an adjustment that is not totally obvious to get it back correctly.

#36 2 years ago

The one you can't take off is factory. The shaft is peened so you can't.

The other is a Gottlieb stop but the nylon bushing may be a bit small for the hole. Shouldn't matter in the grand scheme of things.

The most you can do is look for a replacement from a spare part. PBR probably won't have it.

#37 2 years ago
Quoted from spinal:

Sorry Mike, already done but at least I took lots of photos (and I think it was level and pushed all the way to one end). Anyway, I know for next time - thanks.

Your goal is to have the plunger bottom out just as the drop targets rise above the frame and catch on top of the frame. Adjust the coil too tall and the targets won't push up high enough to catch. Adjust the coil too low and you run the risk of breaking the stop tab off the bottom of the targets.

You should have some evidence of where the screws were positioned relative to the slotted holes to get them close to where they were to begin with.

Good luck.

3 weeks later
#77 2 years ago

In my tenure in the pinball hobby springs are at the bottom of the list of parts that need changing in an EM pinball machine no matter where applied in the game unless clearly damaged or missing.

Good tutorial.

#83 2 years ago

That's almost too nice to play now, Andy.

Notice I said almost.

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