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Unread 12-31-2012, 06:12 PM   #1
msprooch
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Replacing the vacuum motor with an electric one?

I am very comfortable with electronics and was going to do the posi-lock mod when I put in my auto locker but I was wondering just how the vacuum motor worked in combination with the shift fork? And how it physically moved the fork? I would like to make a "electronic posi-lock" and was wanting to toss the idea out to you guys who are more experienced then I am.

Thanks!

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Unread 12-31-2012, 06:19 PM   #2
jbolty
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The vacuum motor just slides the shift fork from side to side. I would not be too hard to rig up a solinoid, if you had the parts. But, getting rid of the whole thing and putting in a TJ or XJ solid shaft is a lot easier.
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Unread 12-31-2012, 07:15 PM   #3
msprooch
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Quote:
Originally Posted by jbolty View Post
The vacuum motor just slides the shift fork from side to side. I would not be too hard to rig up a solinoid, if you had the parts. But, getting rid of the whole thing and putting in a TJ or XJ solid shaft is a lot easier.
I agree but I want to retain control of locking my shafts for turning radius and if I drive with 4wd in the snow.

So does the shaft slide itself with the fork attached to the shaft?
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Unread 12-31-2012, 07:23 PM   #4
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http://www.jeepforum.com/forum/f12/c...works-1349980/
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Unread 12-31-2012, 07:57 PM   #5
msprooch
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Quote:
Originally Posted by jbolty View Post
I see now that the shaft moves and the fork stays stationary on the shaft.
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Unread 12-31-2012, 08:54 PM   #6
NonRubicon
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I have also considered doing a electronic posi-lok. It would require a solenoid with the correct throw to match the range of movement of the shift fork. From there, if you were to place the solenoid directly on the axle housing to actuate the shift fork, the solenoid and all electrical connections would need to be completely waterproof. Another option would to have a cable combined with a remote solenoid, kind of like what OX offers for their cable based lockers.

To start on this, you'll need to know the throw distance of the shift fork and find a solenoid that matches that. From there it's just a matter of figuring out how to transfer the solenoid action to the shift fork.
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Unread 12-31-2012, 09:23 PM   #7
ROWA
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You could try something like this from McMaster-Carr.
http://www.mcmaster.com/#electric-ac...e6u:2thumbsup:
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Unread 12-31-2012, 09:31 PM   #8
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Just lock it over...
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Unread 12-31-2012, 10:41 PM   #9
Old4X
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http://www.a1electric.com/catalog/cat_trunk.htm

Hmmmm..... I might just find something here that will do it. I already have an electro/vac setup All electric appeals to me as well.
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Unread 01-01-2013, 07:20 AM   #10
90DesertTanYJ
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Those are interesting, it has my wheels turning. GM uses an electric hydraulic plunger where oil in a cylinder is heated expands and a rod is forced out. OEM replacements are pretty expensive but one from a JY or if you could get a similar style actuator maybe something would work. The GM actuators arent the best and I am thinking between it and the Jeep style, PosiLok came into being!
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Unread 01-01-2013, 08:38 AM   #11
JohnRodriguez
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I had used a diesel fuel shut off solenoid from a CAT 3208 motor to move the fork. I'll try and post some pick of it this evening when I get off work
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Unread 01-01-2013, 07:55 PM   #12
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2008 wrangler x unlimited. Stone white. Motech 5.3L LS Chevy
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Unread 01-01-2013, 08:24 PM   #13
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Is there a lot of give with the electric actuator or is it just a lot of torque? I would think without some freeplay, the splines would chip or the fork would crack when trying to line up the splines
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Unread 01-01-2013, 09:22 PM   #14
JohnRodriguez
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what I don't show in the pictures is that inside of the boot is a spring to keep the fork in the free wheel side of the axle sleeve when their is not power to the solenoid.. Solenoids are not a high torque electrical component and you can burn them out if they don't have movement in the axle shaft to get the sleeve to move over freely. I burned out the first one I had made when I actuated it without the jeep in motion.
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Unread 01-01-2013, 09:36 PM   #15
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Good to know.
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