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Author
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Topic: Specto 9.5 gearbox overhaul
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Vic Newey
Film Handler
Posts: 41
From: Worcestershire, England
Registered: Dec 2015
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posted November 03, 2017 04:54 AM
I recently made a thread regarding the rewind lever causing the gearbox to jam, this got slowly worse and the whole mechanism eventually became rather stiff.
Although not recommended by others I decided to open the gearbox as otherwise the projector would be unusable.
After removing the screws it was quite a struggle to loosen the lid by working round it with a knife & flat screwdriver blades to ease it gently upwards and it slowly began to lift, seemingly the static spindles that pass through from side to side are not a reasonable push fit but are fitted under pressure
When at last I got it off I was surprised to see how clean it was inside, I had read of others discovering congealed grease inside which had to be scraped out but this one has never been greased so some confusion there unless later years altered how they were lubricated. I notice on the advertising literature that it boasts an 'oilbath gearbox'
The big gold coloured gear is for the rewind, when you twist the knob it lifts a big flat spring which raises the gear to connect with the rewind pulley via a dog clutch.
The dark red gear is the one that caused the jam as it was exceedingly stiff & took quite some time to free it.
Whilst it was apart I examined it to see how the oil dripped in via the rewind hole would lubricate the entire mechanism, it would fall onto the small helical gear on the shutter spindle directly below and then accumulate at the bottom but unless the oil was around 20mm deep it would not create an oil bath to lubricate the lower gears and this most certainly is what happend in this gearbox
The lower two gears have alignment marks to keep the two cams of the claw mechanism in order
As the paper gasket had disintegrated I used a tube of liquid gasket to reseal, getting it back together however was very difficult due to the tight fit of the non rotating spindles but after a considerable struggle and a bit of reaming it finally closed up with a satisfying snap.
I'm pleased to say the projector now runs perfectly & the troublesome rewind is fixed
[ November 08, 2017, 10:38 AM: Message edited by: Vic Newey ]
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