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Old 08-20-2015, 02:58 PM   #1
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Velvac 714881 mirror

I have posted this in another forum but I'm hoping to get wider distribution posting here:
===================================

I have the Velvac 714881 mirror and the driver side mirror is wobbling on the shaft that goes into the support. For some reason I cannot loosen or tighten the set screw. Someone could have lock-tighted. I'm afraid to put more pressure than normal for fear of breaking the pot metal that surrounds it.



The set screw goes into a half moon washer that pushes against the pivot. Loosening it would allow the mirror to rotate. The positioning of the mirror is okay but I am worried about the wobble going down the highway. It is at least an 1/8 of an inch or more play. I cannot lift it upward . I tried shimming it with different substances, washers, etc. but I cannot get a substance around the support arm and the upper mirror and if I did the mirror shell is plastic and may crack.



My last resort is Gorilla Tape down the back side of the mirror and around the support arm to keep it from damaging itself ( if it is damaging). That should keep some pressure on it until I can get somewhere that can replace/fix it. Darn mirror cost $350+.



Any suggestions.
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Old 08-20-2015, 04:52 PM   #2
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BP Blaster (my old can says Rust Blaster) from the local hardware store. Several (many) applications over several days then try to remove the screw. Spray down the mount tube also. Or drill it out and tap the hole and put in larger setscrew.

I looked at the guy funny when he showed me the stuff until he said all the farmers around here use it.

Hope ya get it out.
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Old 08-20-2015, 08:48 PM   #3
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Get an impact driver either one you use with a hammer or the new tiny but powerful cordless driver tools and get the exact size bit.

Set torque to smallest setting and try it.

The impact action will get the screw turning with minimal actual force.


Push straight in keeping good pressure and in good straight alignment.

DO NOT USE A LOOSE FITTING DRIVER !!!

Get one rated for impact and use brand new.

Be sure to squirt wd40 or other thin oil of your choice.
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Old 08-20-2015, 08:59 PM   #4
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Aero Kroil is great for loosening frozen threads.
Ot mix up some 50/50 ATF and lacquer thinner
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Old 08-20-2015, 09:28 PM   #5
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All one needs is "time" to do some of those things, or lack of on-hand equipment. So, today I purchased some items and one was the shims one finds in the windows and door frames department of a hardware store. I wedged them in there, marked the spot, used my trusty utility tool on my belt cut, carved and fitted the shims under both sides of the mirror frame and support arm. Wrapped it with extreme tape (good stuff) and it does not wobble. I'll keep my eye on it going down the road and when we get back home I'll have it worked on or replaced.

Thanks for all the information and if we get stopped somewhere that I can use the info, I'll give it a try.
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Old 08-21-2015, 08:51 AM   #6
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If Loctite was used on the set screw, heat will soften the Loctite. The problem is how to heat the screw without damaging the wires running through the post or the finish on the post. I would suggest putting an Allen wrench in the set screw and applying heat to the other end of the wrench with a propane torch. Red Loctite needs to be heated to 500F before the screw can be removed.
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Old 08-21-2015, 10:46 AM   #7
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One of the set screws on my Velvac froze up a couple years back. I applied penetrating oil multiple times, and eventually purchased a suitable size, good quality (for a nice tight fit) Allen head socket so I could apply steady pressure with a long handle wrench. Working it carefully with a lot of pressure in both directions, I was able to get it moving slightly. That enabled the penetrating oil to work deeper and I got it freed up again. Once it was working, fixing the wobble was no problem.

The mirror on the other side always sta at a slight angle from vertical. Never could figure out why the set screw and washer didn't seat straight, so I made a shim from 1/8" aluminum bar stock to solve the problem. It's been in there for several years now.
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Old 08-21-2015, 11:18 AM   #8
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Thanks Joe and Gary. It may have been that several years ago when it was loose I used "Blue" Loctite but I would never use Red Loctite on anything that may have to be adjusted.

The shims seem to be working. If it doesn't wobble it should not loosen up anymore. When I get to a place we are staying longer I'll give it another try with some of the suggestions. I am also leery of applying heat. With my expertise I'd probably set the MH on fire.
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Old 08-21-2015, 07:27 PM   #9
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Heat is a difficult technique to use when the housings are plastic. I wouldn't use anything hotter than a hair dryer and that may not be enough to do the trick.
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Old 08-22-2015, 11:47 AM   #10
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If you get to the point where you want to replace that mirror I found one at this location. RV Doctor George - Parts It was half or less than the cost at other sites. Also lots of other parts available.
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Old 08-22-2015, 11:56 AM   #11
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Thanks Bob, bookmarked it.
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Old 08-23-2015, 09:46 AM   #12
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Wayne I had some problems a couple or three years ago. Needed a base piece that fit on the bottom portion of the mirror on our coach. It had fallen off for some reason. I contacted the Velvac people and asked what I could do to prevent this in the future. They were very helpful with suggestions etc. They ended up saying something to the affect 'tell you what, we are going to send what you need and if it does not fix it, call me and let me know'. No charge! I like that kind of service.
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Old 08-23-2015, 12:29 PM   #13
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Thanks Doc.
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Old 10-09-2015, 06:18 PM   #14
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Just a quick update. The wedges and tape I used a few months ago is still holding. I'll be home Monday and either work on it myself or when it goes in the shop let the "experts" work on it. I'll post the results and what was found.
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