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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA
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 Posted: Sun Apr 17, 2011 2:25 pm Post subject: "Worn Out" CT-Q67 Cable Assembly (Warning!) |
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Dear Listers,
At 170 hours on my RV-8 now, the Prop control had become increasing more difficult to move starting around 100 hours. The Mixture and Throttle have worked fine and continue to. All three controls use the standard "Green" control cables from Vans, typically a "CT-Qxx" part.
A couple of weeks ago, I disassembled the Governor end of the assembly and made sure that there was no binding or issues on that end. I even lightly lubed up the various moving bits. Yesterday, the Prop control became so difficult to move that I had trouble cycling the prop during run up. I pulled the whole throttle quadrant installation apart today to have a look. I got the cable completely out of the airplane and there are NO outward signs of wear or abuse of *any kind*. But even with the cable completely out of the plane and nothing connected to either end, it is almost impossible to move the cable!! I have a new CT-Q67 cable assembly for my front-mounted governor installation and I'm going to install that next.
But, I wanted to give everyone a heads up on these CT-Q controls. These things are built like they go on a Caterpillar Tractor, so I can't figure out why they would wear out like this.
If one of these controls starts getting stiff and tight, its probably not going to get any better. Replace it before it becomes a safety issue! Not a big deal on the Prop control, but on a throttle or mixture it could be a serious concern.
Best regards,
Matt
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Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours Total Time Since May 2 2010 Test Flight!
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d-burton(at)comcast.net
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| Posted: Mon Apr 18, 2011 10:53 am Post subject: "Worn Out" CT-Q67 Cable Assembly (Warning!) |
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Hi Matt,
One thing that can cause this is a sharp bend radius. You may want to disassemble the cable to try and determine if it was a lubrication issue or if you have a failure in one area. That may give you an indication of where the issue was.
Good luck,
David
(I replaced one that was many years old and I think failed due to lubrication. It got progressively harder to move, but so slowly that it took a long while for me to realize that it was getting too tight. The new one sure was a big improvement)
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Mon Apr 18, 2011 1:49 pm Post subject: "Worn Out" CT-Q67 Cable Assembly (Warning!) |
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Matt:
Years ago I had a very strange problem similar to what you describe. NOW! This is really crazy but check it out anyway.
The GROUND SYSTEM failed and GROUND was being made through the cable... It started off just like yours - A little Stiff - and became worse... What happened was the cable WELDED itself, Cable to Sleeve. I found it by doing a test that was totally off the wall and should not have been done or conceived. I measured the resistance between cable and sleeve. It was zero ohms AND the cable was frozen/welded.
New Cable and New Ground Connections and the problem was solved.
Also - What kind of cable end are you using? If it is a banjo type are you also using the Cone Washers? ==/ \== They look something like that.
If the trailler hitch type make sure the locking clip is in place and safety it with a ty-wrap so the clip does not slide. Check them for ware and grease them.
Barry
On Sun, Apr 17, 2011 at 6:23 PM, Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)> wrote:
[quote]--> RV6-List message posted by: Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)>
Dear Listers,
At 170 hours on my RV-8 now, the Prop control had become increasing more difficult to move starting around 100 hours. The Mixture and Throttle have worked fine and continue to. All three controls use the standard "Green" control cables from Vans, typically a "CT-Qxx" part.
A couple of weeks ago, I disassembled the Governor end of the assembly and made sure that there was no binding or issues on that end. I even lightly lubed up the various moving bits. Yesterday, the Prop control became so difficult to move that I had trouble cycling the prop during run up. I pulled the whole throttle quadrant installation apart today to have a look. I got the cable completely out of the airplane and there are NO outward signs of wear or abuse of *any kind*. But even with the cable completely out of the plane and nothing connected to either end, it is almost impossible to move the cable!! I have a new CT-Q67 cable assembly for my front-mounted governor installation and I'm going to install that next.
But, I wanted to give everyone a heads up on these CT-Q controls. These things are built like they go on a Caterpillar Tractor, so I can't figure out why they would wear out like this.
If one of these controls starts getting stiff and tight, its probably not going to get any better. Replace it before it becomes a safety issue! Not a big deal on the Prop control, but on a throttle or mixture it could be a serious concern.
Best regards,
Matt
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
r> s.com/Navigator?RV6-List" target="_blank">http://www.matronics.com/Navigator?RV6-List
ronics.com/" target="_blank">http://forums.matronics.com
-Matt Dralle, List Admin.
=====
[b]
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