Question about Bushnell Voyager 78-4503 (675 x 20mm) Telescope

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Equatorial Mount problem. Gear at latitude adjustment (not the worm gear) is busted. Need a replacement.

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Only Bushnell will have this part. Contact them here:

http://www.opticsplanet.net/bushnell-warranty.html

Posted on Apr 07, 2011

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Replacing the worm gear on a Bell & Howell 16mm film projector is a very long and involved process requiring a complete teardown. It is similar to replacing a blown head gasket in an automobile engine. The worm gear is the heart of the mechanism and takes a lot of time consuming labor just to get to it. In the process you lose a bunch of critical adjustments which require resetting with special Bell & Howell tools/jigs/gauges. Many of these projectors are at least 30 to 40 years old and will also require re-lubrication.
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The ALTITUDE adjustment matches your LATITUDE. I live at 32.5 degrees North latitude. So the scope is first adjusted to 32.5 degrees UP.

Then the Right Ascension is point to Polaris the North star by MOVING the entire scope and mount.

Read my Equatorial mount TIP on my profile page, and read this web site.

http://www.astro-tom.com/tips_and_advice/precision_polar_alignment.htm#Rough%20Polar%20Alignment

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closest I have is 94 explorer. may be similar.

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Item Part Number Description 1 3E501 Steering Gear Sector Shaft Seal 2 3524 Steering Gear Input Worm Gear and Rack 3 3647 Steering Gear Worm Ball 4 3523 Steering Gear Ball Return Guide 5 3A670 Steering Gear Worm Thrust Bearing Adjuster 6 — Locknut (Part of 3577) 7 3571 Steering Gear Worm Thrust Bearing 8 3575 Steering Gear Sector Shaft 9 3524 Steering Gear Input Worm Gear and Rack

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Most of these German Equatorial mounts are sourced from various factories in China and are knockoffs of earlier Japanese models. Konus and other rebranders simply by a lot from one of the factories and do not provide parts or service support. If you have the Konus Newtonian telescope, (200 mm diameter (7.8"), focal 1000 mm.) with heavy-duty equatorial mount, I think that it's made by Jinghua. This is a pretty common mount (Meade sold it for a while and still sells a Jinghua as the LXD-75). Your best bet it to post a wanted ad on Cloudy Nights Classifieds. There are a few of us that keep inventories of spare parts from damaged equipment fro service and repairs. HTH, Geo.

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