Throttle cable with friction lock

[Rex Havis]

I'm looking for some information about the part or material that is used to provide friction in the throttle cable with a friction lock. Also if you know of a source that i can purchase the part from.

[Hank Jarrett]

Re: Throttle cable with friction lock

Depends a lot on which throttle you have. When you unscrew the friction knob does it actually unscrew? If not it has probably been over tightened and the aluminum threads stripped (had one like that and had to turn a new knob). It was a real bugger to get apart since the friction knob would just turn but not unscrew.

If the knob unscrews look in the opening that was in the hole. If it has a countersink cut into it there should also be one in the bore of the panel part. A lot of these get "fixed" by sticking a rubber "O" ring in them. Don't. It won't work very well. There is supposed to be a piece of split brass tube in the bore around the shaft. When you tighten the knob the countersinks squeeze the tube and it grabs the shaft. If yours has a split tube it may have worn and is too short to be squeezed any more.

They really aren't that hard to rebuild and when fixed correctly are a joy to use again. Mine had the rubber "O" ring when I bought her and it was always stiff when I tried to move it and moving when I wasn't. Real PITA.

Hank

If yours is a different kind post some photos and I am sure we can figure it out.

[Rex Havis]

Re: Throttle cable with friction lock

I'm sorry Hank but I don't know how to post photos. The friction knob does unscrews. the friction lock mechanism
consist of the base which screws onto the cable housing and the fricton knob which screws into the base fitting. Your right about the rubber "O" ring. Bad idea

[Guest]

Re: Throttle cable with friction lock

Here is a picture of a Shakespeare and a Cessna throttle.

The Shakespeare has a rubber ferrule, you can see it and it has ribs on it and is brown in color.

The Cessna one has a nylon ferrule and it has one split in it.

Not sure why there are two threads on this but I will also put this in the other thread.

Dave

[M Towsley]

Re: Throttle cable with friction lock

Dave,

Because some folks aren't aware there is a tab for 'New Posts' which will list all new posts since the last time one has visited. So they put the same posts in a couple of areas, perhaps not knowing how well the 'New Post' button works. I don't search individual forums for new posts, I just use the 'button'. Just FYI for those who may not know.

[Hank Jarrett]

Re: Throttle cable with friction lock

If you look at the ID of the silver one you will see the smooth countersink. There should be another one in the base nut that clamps the unit to the panel. I would guess that the rubber ferrule probably didn't have the "ribs' when it was put in originally and those are threads pressed into the rubber. If you make a short piece of brass tube that is snug on the solid shaft section of the throttle cable and run a split length wise in it when you turn the knob in the countersinks will squeeze the tube tight around the throttle shaft. The only hard part is getting the length of the split tube right. Too long and not enough threads catch. Too short and the threads bottom before the split tube pinches the shaft.

Hank

[Guest]

Re: Throttle cable with friction lock

The rubber ferrule has ribs not thread impressions, they have no pitch and are square.

That's not so clear in the picture I posted.

Anyhow there are some pic of two cable systems.

Dave