(Topic ID: 116916)

tech: MM drawbridge only goes half way

By billsfanmd

9 years ago


Topic Heartbeat

Topic Stats

  • 11 posts
  • 5 Pinsiders participating
  • Latest reply 9 years ago by KeithinMI
  • Topic is favorited by 2 Pinsiders

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#1 9 years ago

Have little info but going to help some with a MM this weekend. Says it does go up and down normally but sometimes after it you beat it it only goes half way back....Anything I should look for. He thinks the set screw and gears were looked at are fine....Opto trouble? Anything else that would make it stop in the middle...

Thanks for any help

#2 9 years ago

I just fixed this problem on a MM. It was one of the plastic gears in the raise/lower mech that was missing a couple of teeth.

#3 9 years ago

great....easy or pain in the &^%%^? I suspected gears. He said def has a lot of plays.
should I replace all gears or just the offending gear ?

#4 9 years ago
Quoted from billsfanmd:

great....easy or pain in the &^%%^? I suspected gears. He said def has a lot of plays.
should I replace all gears or just the offending gear ?

If you are going through the trouble of disassembly, I'd replace all the gears. They do get brittle as they get older and while you've got the mechanism apart, you may as well put all fresh gears into it for the extra couple of bucks.

#5 9 years ago
Quoted from KeithinMI:

I'd replace all the gears

Are the gears readily available?

#6 9 years ago
Quoted from KeithinMI:

If you are going through the trouble of disassembly, I'd replace all the gears. They do get brittle as they get older and while you've got the mechanism apart, you may as well put all fresh gears into it for the extra couple of bucks.

Is this relatively easy or a PIA. Doing it for local pin owner.

#7 9 years ago

Relatively easy, but shoot pics of how they are positioned, from all angles.
Better save then sorry

Also look at the axel of the bridge itself, is it moving freely no gunk ..

#8 9 years ago
Quoted from RoyF:

Are the gears readily available?

I am pretty sure Marco carries them.

#9 9 years ago

Looks like problem was a broken bracket. Helped him troubleshoot over phone. passed all tests but bracket is broken.

#11 9 years ago
Quoted from billsfanmd:

Looks like problem was a broken bracket. Helped him troubleshoot over phone. passed all tests but bracket is broken.

bracket is here:

http://www.marcospecialties.com/pinball-parts/04-10987.1

If you're tearing down the assembly, I'd put new gears in just to be sure. But then again, that's just me.

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