8mm Forum: st1200hd belt replacement

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Topic: st1200hd belt replacement

Stephen Svitek
Junior
Posts: 6
From: Canonsburg Pa. USA
Registered: Jan 2008

posted February 03, 2008 09:04 AM

Greetings. As a newbie from Canonsburg Pa., I need to know the procedure for replacing the belts on the Elmo. It looks like you can just stretch them around the pulleys without removing anything if you alternate the positions of the two rubber drive wheels. Is this advisable or will the belts get stretched? Is it necessary to remove any parts first? The belt for the counter looks difficult. The large belt on the back that drives the arms looks pretty simple. I've never had the opportunity to work on a projector before so I'm a little hesitant right now. Thanks in advance!

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Chip Gelmini
Phenomenal Film Handler

Posts: 1733
From: Brooksville, FL
Registered: Jun 2003

posted February 03, 2008 09:12 AM

Steve Osborne of Kettering Ohio should have belts in stock. Good idea when you order, send in the name plate serial number on the back of your gearbox cover so he can match the right belts. There is a difference between the ST1200 and the ST1200HD, for example. The very early ST1200 (before the "D" model I believe used round belts (oh - rings) where later on they changed to square poly v.

You are correct about moving the belts through the other assemblies of the machine. That should work just fine.

If you are not doing any recording you can pull the frame counter belt out completely with needle nose pliers. Of course the counter won't turn when you run the machine if it doesn't have the belt in there. Just make sure that 100% of that belt comes out if it breaks in the process, any fragments could cause jams, I would suspect.

Before you begin, take a digital shot of the old belts still installed. Then when you install the new ones compare to the shot to make sure they are on the right pullies. You can change the speed by mistake of the new belt is installed on the wrong htz pully. It';s been awhile since I've done this job but it is outright simple to do.

CG

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Stephen Svitek
Junior
Posts: 6
From: Canonsburg Pa. USA
Registered: Jan 2008

posted February 03, 2008 11:10 AM

Hi again Chip:
After reading your post, I decided to give it a try. I already had the belt set from Ebay and it turned out to be the right one. The arm belt that I thought was the easiest turned out to be the most difficult for me. Parts had to be removed but after a test, it seems to be running ok. I didn't tackle the counter belt because it really looks difficult. I did have a problem with the green loop button staying depressed but I know that this had been addressed on other posts so I will start searching. Thanks so much for helping me out and just wanted to say that this is one great forum!!! Steve

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