(Topic ID: 76377)

Doctor Who Owners Club.....Time Lords Welcome!

By HoakyPoaky

10 years ago


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4 key posts have been marked in this topic

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Post #194 Link to @pinball_faz 's Time Expander/Mini Playfield Guide Posted by pinball_faz (9 years ago)

Post #491 Link for 3-D Printed Dalek Playfield Posts. Posted by Pinballfantexas (9 years ago)

Post #696 Link to Alternative Whomobile Pinside Thread. Posted by swinks (8 years ago)

Post #1428 ColorDMD install with pics plus other cool things. Posted by ArcadeTechNerd (6 years ago)


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#1233 7 years ago

Hey all, I recently bought a partially working Doctor Who and I need a second opinion before I buy a new motor. The mpf won't move at all, but I can hear the motor working during startup so I've gone and opened the gearbox. I need some opinions on these pics. Hopefully they show well enough on the forum to see what I see. The teeth for the bottom gear should come in contact with the small circle of teeth on the gear above it, but they don't. The teeth for bottom gear sit just under the small set of teeth of the upper gear.

It looks to me like the teeth on the upper gear are supposed to be longer and extend down to the body of the gear, and therefore this setup is toast and time for a new motor assembly, right?

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#1244 7 years ago
Quoted from pinball_faz:

There's a few things about your gear box that don't seem happy.
1) The gear seems completely ground out. Notice how there's a lip on the gear... not supposed to bet there (arrow).

2) The slurry of grease appears to have metal filings mixed in. I think that's the rest of that missing gear.
3) The big gear with the drive arbor does not come off the top of the box (at least I could not get mine off). It's like it's pressed into a bearing. The fact that it came off suggests that the bearing was shot, the arbor started wobbling and that angular motion trashed the softer of the two gears.
Was the gearbox sealed with brass tubular rivet or was it held together with a nut/bolt.
Here's a few pics I took of a box I keep for just such an emergency. Notice the shape of that top gear... it's solid. No lip and the slurry I have is pure grease.

I think you are needing a new gearbox. But keep all the parts... you never know.
faz

Well that's a bummer, thanks for taking a look. Ordering a new motor/gearbox tomorrow. To answer your question, the gearbox was held together with 4 machine screws.

3 months later
#1457 6 years ago
Quoted from Robotworkshop:

If anyone has the glass off the playfield can you take a picture of the front of the apron? Still trying to determine the correct two screws to get. Are the philips heads or 1/4 hex heads? Sheet metal style or machine screw? Also size 6, 8 or something else and how long? If it is in the manual I missed it.

Here's mine. 1.25 inch long.

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#1458 6 years ago

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