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Topic: Sankyo 2000H. Calling Dogtor Frank Arnstein
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Barry Fritz
Phenomenal Film Handler
Posts: 1061
From: Burnsville, MN, USA
Registered: Dec 2009
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posted February 13, 2015 06:54 PM
Hi Frank. I removed the screw and washer and found out why the cog was so hard on the shaft. The shaft has a flat spot on it, as does the nylon cog. That is how it keeps from turning on the shaft. Somehow,that nylon cog turned anyway and the flat spot were not aligned anymore. That made the cog extremely tight on the shaft. I had noticed that the cog look slightly out of round and appeared off-center compared to the washer on the end. If you look closely at the pic, you'll notice it. Anyway, got it off and aligned,and lubed but it still doesn't want to move forward on its own. I can get a little probe on it and move it forward so it meshes with the roller cog, and then it is fine going forward. If I put it in reverse, it comes out like it should but then won't go back in on its own. I may need to stretch the spring a bit or carefully enlarge the nylon cog hole slightly. The motor is also acting a little strange in reverse. It seems to slow a bit and then surge back up to speed at times. I appreciate your help Frank. Thanks.
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Barry Fritz
Phenomenal Film Handler
Posts: 1061
From: Burnsville, MN, USA
Registered: Dec 2009
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posted February 14, 2015 11:48 AM
This is getting a bit frustrating. The nylon gear slides freely on the shaft, but is not getting pushed forward enough to engage the roller gear. There is a washer on the shaft behind the spring, so I added another washer to put more pressure in the spring. Still not enough. The gear just barely touches the roller gear and occasionally catches and turns the roller a bit, but then pops out. It is acting like there is simply not enough tension in the spring. I stretched the spring a bit but that did nothing. The only thing else to try, I guess, is to put another washer behind the spring. The only issue with that would be if it was to much tension, it may not disengage the gear when put in reverse. That may not occur however because the gears cannot mesh in reverse. Frank, the gear returned nicely to round once it was off the shaft.
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