This one isn't really a problem, but it could be. When Rudy's jaw closes, the motor keeps
running for a few seconds, making a grinding noise. On a normal Funhouse, there's a
stop on the jaw gear sector that keeps the motor from turning any further, when the
jaw is fully open or fully closed. One of those stops is broken off, so the drive gear
runs off the end of the teeth on the gear sector, and rattles on the last tooth as the
jaw springs try to keep things engaged. The possible problem is that if the drive gear
doesn't catch the first tooth when the jaw tries to open, it might not open.
Here's the motor/gear/sector assembly. To get this on your workbench, you have
to unbolt this assembly from the playfield, and then unhook the jaw link from the
gear sector. There's a key on the sector (lower right corner of this photo) that
has to line up with a keyway hole in the jaw link, and then the two slip apart.
Remove three screws that hold the side plate on, and everything slides off.
New parts are great! The part probably could have been glued together, maybe reinforced
with a bit of brass rod after drilling holes in each plastic part, but for $2.60 I
just bought a new gear sector and popped it on. As long as things were apart, I wiped
down all the pieces to get the flipper dust off. Turns out flipper dust is magnetic,
so there was a neat pattern in the dust on the outside shell of the motor. As always,
don't oil these parts (or any pinball parts!) because the oil will collect any floating
dust, and turn into a sticky abrasive mess that'll wear things out quickly.
Back to the Funhouse Restoration homepage.