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Automatic Gate Lock (FM143) for Mighty Mule Automatic Gate Openers

4.4 out of 5 stars 141 customer reviews
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List Price: $199.00
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  • The Automatic Gate Lock provides peace of mind and added security for your single or dual gate. Unlocks and locks automatically as the gate is activated.
  • Provides secure protection to withstand up to 2500 lbs. of force, providing stability and security.
  • Easy DIY (Do It Yourself) installation for your Mighty Mule Automatic Gate Opener system.
  • The Mighty Mule Automatic Gate Lock is compatible with all single and dual Mighty Mule or GTO/Pro Automatic Gate Swing Openers.
  • Backed by a 12 month Mighty Mule Warranty and Technical Support.
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$119.00 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Automatic Gate Lock (FM143) for Mighty Mule Automatic Gate Openers
  • +
  • Mighty Mule Wireless or Wired Digital Keypad (FM137)
  • +
  • Mighty Mule Single Button Gate Opener Remote (FM135)
Total price: $179.21
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Product Description

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From the Manufacturer

The Automatic Gate Lock provides maximum stability and security on Mighty Mule Gate systems, recommended for gates over 8 ft. long, high wind areas or additional reinforcement to prevent against unwanted intrusion.

Product Details

Package Quantity: 1
  • Product Dimensions: 7.2 x 12.2 x 2.5 inches ; 5 pounds
  • Shipping Weight: 5.8 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B0009SS13Q
  • Item model number: FM143
  • Average Customer Review: 4.4 out of 5 stars 141 customer reviews
  • Amazon Best Sellers Rank: #10,117 in Home Improvement (See Top 100 in Home Improvement)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Reviews

Top Customer Reviews

Item Package Quantity: 1
This is the best protection against vandals or individuals pushing hard on the gate arm. Most gate arms can take some pushing, but if a vehicle or person pushes hard enough, and if the gate is large, the arms will get damaged and will have to needlessly be replaced. A Gate lock is a must and this new version has a nice powdercoated black finish that blends in nice with most gates.
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I've had my Mighty Mule 350 and latch installed for about two weeks. Gate operator works great. Latch, not so much. Last week, while I was at work, someone tried to access my backyard by pushing in on the gate. The electricians had difficulties installing the latch, so, the latch doesn't. When I closed the gate that morning, I left it as it was...unlatched. As it wasn't evident without very close inspection, I didn't see it as a problem, but I found the gate standing open enough for an average sized person to slide through the opening. After readjusting the opener, I proceeded to work on the latch with no luck. The installers appeared to have installed it correctly.

So, this morning I called the help line. Of all of the help lines I have used over the years, Mighty Mule employs, quite possibly, the rudest and least helpful associate I've ever dealt with. I really want the latch to work. More later after I find the solution.

After some reflection on the unsatisfactory call to the helpline, I called for a Mighty Mule supervisor later in the afternoon and got two! They were very helpful with both the employee situation and my original latch problem, although the problem is not quite solved, as I ran out of time to work on it. The secret appears to be balancing the Stall Force and the Closed Position Limit settings.
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I bought what appears to be the identical lock from Chamberlain (also bought the Chamberlain gate opener, which I highly recommend and reviewed separately). I'm not sure who manufactures the lock, but it appears that a number of companies put their name on it (actually, there is no name at all on my lock; it simply comes with a Chamberlain sticker).
The lock works well, and the only installation issue I encountered was also described by another reviewer. If your gate closing position is set too short (e.g. even with the gate post, instead of just slightly past it by maybe an inch or so), the gate can "bounce" away from the latch, allowing the solenoid to close outside of the latch. Just set your closing position so it "holds" the gate firmly against the post/stop latch when it closes.
I did have one problem with the lock after several months of use. It began sticking open, whereby the solenoid would release the lock plunger properly as the gate closed, but the plunger/latch wouldn't actually close due to being stuck internally. I couldn't see how to fix it without disassembling the lock, so I called Chamberlain. They have great customer service, and they promptly shipped me a replacement. Now I have the old one as a spare, assuming I can fix it after taking it apart.
Anyway, whichever version of this lock you buy, I'd give it a good rating. It's a fairly basic device, and a bit overpriced (I found mine on ebay from someone who bought it but never installed it, and saved big; but that was just luck). But it does the job.
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I bought this lock because my dogs discovered they could worm their way out of the gate and run into the street (when i just had the GT500 opener). I thought this would be perfect to lock the gate in place with no chance of their escape. What I found was after hours of adjustments, it would not time itself correctly to lock when shut and to release when opened. It would try to open even though the latch was still locked (latch would open and close back before the gate would start to open). I finally removed the lock when it malfunctioned so bad, it bent the arm of my GT500 opener. Luckily I bought the opener at a local store and they swapped it out for me. The new opener has worked fine since I took the lock off.
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I have two MM 600 PRO openers.
I am in agreement with the most critical review above. I found the same problem in that the lock released on OPEN and before the gate moves away, the lock CLAMPS the pin before the gate can open. It only releases the pin for about TWO seconds and immediately CLAMPS. I had previously installed a nylon shear pin instead of the steel pin so no damage occurred when the lock CLAMPED the gate closed while trying to open. I disabled the soft start feature hoping that the gate could move out of the lock before it CLAMPED back. I found that if you disable the soft start, the lock only OPENS for about than ONE second. This could easily be fixed with a change to the PROGRAMMABLE CHIP that controls the whole gate, but Mighty Mule has not listened to any feedback to correct this problem. I am surprised that more people haven't reported this same problem. I am able to engineer around this problem with a DELAY ON RELEASE RELAY, but how many homeowners would be able to do this? Should be ZERO stars.

Twenty four hours later--Built a six second delay on RELEASE, meaning that the lock stays open for six seconds as the gate opens, and the lock works perfectly now. Also, when the gate reaches the stop post, bounces around a bit and then settles down, then the latch closes. On OPEN, the latch stays open until well after the gate moves away. This is the kind of simple fix that our software people do on a regular basis. Oh, and I triple protected the PCB from spikes from the large solenoid that releases the latch. I am reasonably sure that many of the failures that occur with this lock can be attributed to the large back EMF spike that the miniature relays can't handle. The lock is WELL MADE and FINISHED WELL and I expect never to have a problem with this lock. With a simple SOFTWARE fix, this would be 5 stars.
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Automatic Gate Lock (FM143) for Mighty Mule Automatic Gate Openers
This item: Automatic Gate Lock (FM143) for Mighty Mule Automatic Gate Openers
Price: $119.00
Ships from and sold by Amazon.com
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