Question 4WD Actuator

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Thread: 4WD Actuator

  1. #1
    Lurking Member davvver's Avatar
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    Default 4WD Actuator

    I think the actuator is starting to go on my 2005 DC 4x4. The only reason I think this is because when I put it in 4x4 the light just blinks and does not stay solid. The 4x4 is working find so far and engages and disengages no problem.

    Is this a sign I should it is going? And should i have it replaced now or wait until it stops working?

    The reason I ask this is because I am unsure if it will do damage to the front driveshaft or other parts if it lets go once engaged.

    Thanks for any advice!

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  3. #2
    SAS'ed #5 dyogim's Avatar
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    Default Re: 4WD Actuator

    Is 4HI or 4LO blinking? Either way, the contacts within the actuators (front diff or the transfer case) may not be fully engaging sending false signals. Even though the shift rod is shifting the fork in the diff/xfer case properly. Take the cap off of the actuators and grease the contacts. Cycle it a few times and see if the problem consist.

    Brand new, I believe the dealer wants $600-$800. Best bet is to buy from another tundra, tacoma or sequoia from around the same year. They pretty much share the same actuators.

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    Default Re: 4WD Actuator

    I think you are correct I remember reading in here about a fella who cleaned up the contacts w/ sand paper and then lubed it up well , he stated it was still working and saved a ton of $$ in fixing vs replacing.


    repo

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    Default Re: 4WD Actuator

    regular ol' moly grease?
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    Default Re: 4WD Actuator

    I'd don't recall what he used and can't find the thread....

    I would think using a marine grade white lithium.... but I really have no good answers.

    Talk to your local parts guy:dunno

    Take some pics and start a thread, I know I'll follow and I'm sure there are many others who would too.

    Repo

  7. #6
    SAS'ed #5 dyogim's Avatar
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    Default Re: 4WD Actuator

    Quote Originally Posted by 2003bajatundra4x4ac View Post
    regular ol' moly grease?
    Quote Originally Posted by hilandfrog View Post
    I'd don't recall what he used and can't find the thread....

    I would think using a marine grade white lithium.... but I really have no good answers.

    Talk to your local parts guy:dunno

    Take some pics and start a thread, I know I'll follow and I'm sure there are many others who would too.

    Repo
    Use a dielectric grease. Permatex and loctite make a product for this. Most of the auto parts store should have something available.

  8. #7
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    Default Re: 4WD Actuator

    Quote Originally Posted by dyogim View Post
    Use a dielectric grease. Permatex and loctite make a product for this. Most of the auto parts store should have something available.
    +2. You must use a dielectric grease for lubricating electrical contact surfaces. Any other grease (moly, lithium, etc) will inhibit conduction.
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    Default Re: 4WD Actuator

    Am looking for my 4 wheel drive actuator under my 2000 Tundra. Can anyone give a link or a picture of what I am looking fer? I have the green blinking 4wheel light on my dash.....wanting to lube it up with dielectric grease and see if I can DYI it. Thanks!!!

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    Default Re: 4WD Actuator

    I found the 4 wheel drive actuator under the truck. 3 10mm bolts and one vacuum line later it was open. It was filled with yellow grease (dielectric grease?) I put it back together and snipped off 1 inch of tubing in hopes that it would work. No luck! The 4wheel lights still blink. I tried backing up in 4wheel, turning the wheel left and right down the street. When I pushed the button back into 2wheel I got a clunk when I drove about 20 feet forward. Not sure what that all means.

    Next plan of attack is to check the CV joints. The driver side looks a bit greasy and will have a professional look at it. I do not have a mechanic's greasy thumb.....

    Any further help is appreciated!

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    Default Re: 4WD Actuator

    that clunk is normal on these rigs. best to coast while waiting for them to engage/disengage.
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    Default Re: 4WD Actuator

    Quote Originally Posted by Remmy700P View Post
    +2. You must use a dielectric grease for lubricating electrical contact surfaces. Any other grease (moly, lithium, etc) will inhibit conduction.
    Actually it's the other way around. A dielectric material is an electrical insulator. Dielectric grease is completely non-conductive. The purpose of the dielectric grease is to prevent oxidation or corrosion of the metal surfaces while providing electrical insulation. It's a crap shoot applying other types of grease to electrical contacts as some types of grease are conductive. Moly grease is somewhat conductive, for example, and would be a bad choice for lubricating electrical contacts.

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    Default Re: 4WD Actuator

    I've lost complete faith in Toyota as a result of this issue on my Sequoia. They want 1600 dollars to fix what is clearly a defective part. My 4wd will not engage now as a result. I had a doublecab that succumbed to an early transmission failure and now this on my Sequoia. I'm done with what was once a reliable brand. Unfortunately when you look at the new models from Toyota they appear to have been designed and built by Tonka. The 4runner is hideous, the Tundra is a clone of the F-150, and the Sequoia still looks and feels as cheap as an old Dodge Durango. Step up to the Landcruiser and Lexus LX and it has the same cheaply painted silver plastics that wear off when you look at them that the Toyotas do. Leather is no longer leather and cloth is no longer cloth. Build quality and material quality are horrendous across the board. Am I on an island here or does anyone else agree? What are you buying to replace your Toyotas?

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    Default Re: 4WD Actuator

    sorry for your drama, but maybe a mazda is in your future?
    Last edited by 2003bajatundra4x4ac; 09-27-2014 at 08:18 AM.
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    Default Re: 4WD Actuator

    Hi Guys and fellow sufferers. Having the same problem (as of yesterday) on my 2004 Tundra. Have had no problem until yesterday, when 4wd would not engage when I was bringing my boat out. 2wd did not cut it, wheels spin at the back. Had to get my buddy to come down with his truck and pull the boat out. I use the 4wd a lot so its not a problem due to lack of use. In any case I always use the 4wd at least once a month as a matter of course. Anyways, hoping I can find a solution other than actuator replacement. All I get is the '4HI' light flashing and no satisfying soft clunk as it fails to engage. Could not have happened at a worse time. Will be watching this thread with interest as I really need the 4wd on my truck. Any pointers with cleaning up the switches on the actuator would be appreciated. Soft (or not so soft) tap with a rubber mallet will be a last resort.

    An expensive month, new cat ready to be fitted, and a new set of tires in the mix....never rains etc eh?
    Last edited by Macadian; 09-27-2014 at 05:17 AM.
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