Film-Tech Forum ARCHIVE: Problem with a Prevost P93

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Topic: Problem with a Prevost P93

Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002

posted 08-11-2002 01:43 AM

The original complaint was that the film wasn't running at the right speed (too slow). Also, the motor had to be given a "running start"...the operator would have to spin the flywheel by hand or else it would not start.

We changed out the start capacitor and the motor started up just fine. But after a while the speed would change and gradually, the film would slow down. Eventually, the film stopped altogether.

Next we went to look at the intermittent and discovered that the upper sight glass was busted and so oil wasn't getting distributed to the gears (or the intermittent).

I really do not have a lot of experience dealing with this model. This location is the only one that uses a non-Century projector.

Is there anything else to check while I'm looking at this thing? I reckon there could easily be other damage here after the oil problem.

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Richard Fowler
Film God

Posts: 2392
From: Ft. Lauderdale, FL, USA
Registered: Jun 2001

posted 08-11-2002 07:09 AM

You probably have bearing problems since it has been running dry so long. P60 and 70 are tanks and run forever, the P93 is less forgiving.
Richard Fowler
TVP-Theatre & Video Products Inc. www.tvpmiami.com

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Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002

posted 08-12-2002 06:24 AM

Richard:

Thanks for responding. Which bearing(s) in particular are you talking about? I really don't know a whole lot about the interior of these machines.

Thanks,
Manny.

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Rick Long Jr
Expert Film Handler

Posts: 211
From: Toronto, Canada
Registered: Jul 2000

posted 08-12-2002 07:59 PM

Not sure if this helps, but I've replaced LOTS of gears on Prevost P-55 models. The gear compartment ran in an oilbath with steel on either nylon or phenolic gears. I would assume that the P-93's are similar. Does anyone know for sure? If so, The gears were usually the lower sprocket main drive gear or the intermediate shutter drive gear. They are held onto the shafts with a collar and pins through the shafts. BIG fun without a pinpress.
If the machine has suffered a stripped gear, clean out the sump thoroughly. The P55 didn't use bearings, but oilfed bushings Like a Simplex.

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Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002

posted 08-12-2002 10:44 PM

Yes, IIRC they are nylon and steel. They do not appear stripped. I think it just came to a halt gradually instead of a sudden jolt.

I have already removed the intermittent and sent it back for repair or replacement (not sure which).

As for the similarity to the P55...the P93 sits in an oil bath, too. Actually, it's more like a shower when you consider that the pump gets the oil where it needs to go. There's this creepy-looking "tree" that feeds the oil to each pair of gears.

The oil pump has a screen at the base to filter out any debris that might be in there. As a precaution, I have already drained the oil and cleaned the chamber and I will replenish it with fresh oil whenever it's ready to go again.

I will snap a pic next time I'm over there and email it to you if you're interested in seeing the interior of the chamber. (If anyone else is interested then it might make sense to post it here.)

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