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Replacement Gear Kit for Bulldog Sidewind Jacks w/ 12,000-lb Capacity

Replacement Gear Kit for Bulldog Sidewind Jacks w/ 12,000-lb Capacity

Our Price: $72.88
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Replaces the gears for your Bulldog square-tube jacks with 12,000-lb static weight capacity (BD182800, BD182804, BD182805, BD182815, BD182300, BD182304, BD182400, BD182404, BD182411, BD182415, BD182500, or BD182524). 1-800-496-5010 to order Bulldog accessories and parts part number BD500212 or order online at Free expert support on all Bulldog products. Great prices and Fastest Shipping for Replacement Gear Kit for Bulldog Sidewind Jacks w/ 12,000-lb Capacity. Accessories and Parts reviews from real customers.
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  • Reviews (33)
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Bulldog Accessories and Parts

  • Camper Jacks
  • Trailer Jack
  • Gear Parts
  • Gears
  • Bulldog

Replaces the gears for your Bulldog square-tube jacks with 12,000-lb static weight capacity (BD182800, BD182804, BD182805, BD182815, BD182300, BD182304, BD182400, BD182404, BD182411, BD182415, BD182500, or BD182524).


  • Replaces the gears for your Bulldog square-tube jacks with 12,000-lb static weight capacity
    • BD182800, BD182804, BD182805, BD182815, BD182300, BD182304, BD182400, BD182404, BD182411, BD182415, BD182500, or BD182524
  • Includes all that you need to replace or repair gears


  • Large gear dimensions:
    • Height: 1.43"
    • Outer diameter: 3.42"
    • Inner diameter: 0.875"
  • Small gear dimensions:
    • Height: 1.25"
    • Outer diameter: 2.50"
    • Inner diameter: 1.00"
  • Two hex nuts/washers dimensions:
    • Height: 0.50"
    • Outer diameter: 1.5"
    • Inner diameter: 1.00"
  • Washer dimensions:
    • Outer diameter: 1.75"
    • Inner diameter: 0.875"
  • Long roll pin dimensions:
    • Length: 1.50"
    • Diameter: 0.30"
  • Short roll pin dimensions:
    • Length: 1.25"
    • Diameter: 0.25"
  • Spring dimensions:
    • Length: 4.47"
    • Large end outer diameter: 1.45"
    • Tapered end outer diameter: 1.17"
    • Inner diameter: 1.00"


  • Bulldog jacks with 12,000-lb static weight capacity: BD182800, BD182804, BD182805, BD182815, BD182300, BD182304, BD182400, BD182404, BD182411, BD182415, BD182500, and BD182524

500212 Replacement Gear Kit for Bull Dog - 12,000 lbs

Item # BD500212

Customer Satisfaction Score:

Customer Reviews

Replacement Gear Kit for Bulldog Sidewind Jacks w/ 12,000-lb Capacity - BD500212

Average Customer Rating:  4.8 out of 5 stars   (33 Customer Reviews)

Replaces the gears for your Bulldog square-tube jacks with 12,000-lb static weight capacity (BD182800, BD182804, BD182805, BD182815, BD182300, BD182304, BD182400, BD182404, BD182411, BD182415, BD182500, or BD182524).


These parts were a great time and money saver. The tongue jack on this trailer was welded to the trailer cross member by the trailer manufacture, so removing the old jack and welding on a new one was going to be expensive and time consuming; plus the trailer would be out of service for a couple of weeks. With the parts to rebuild the jack, we did the repair in less than two hours. As a bonus, the parts actually arrived two days sooner than promised. Thank you for the great service.


Went to drop my gooseneck horse trailer after use and no-go! Apparently the screw jack became stripped over the years and needed to be replaced. The hardest thing about this project was removing the entire unit from beneath as shown in the pictures. For clearance I had to not only drive the rear wheels onto small ramps but also dig beneath the jack to drop everything out. Everything fit perfectly. The video was great at explaining things. Brendan gave me a few shipping options and items arrived promptly without breaking the bank.


Exact fit parts. Instructions were helpful as were the available videos. Works much better and easier now. The original bulldog hitch worked for almost 20 years.


It works as it should.


Product was delivered quickly and was exactly what we were after. Turns out the kit covered several different versions of the jack assembly, but only minor modification (drilling out the pin hole in the cross shaft) was required for the included parts to drop into place. Great service, great product!!


Did not know the make of the landing gear as all tags were removed when builder painted trailer. James with etrailer was very helpful in figuring out what was needed and the parts are are a perfect replacement for the damaged parts. Parts look to be well made and should last for many years. Thanks James and etrailer for the help.


Just what I needed. Arrived earlier than scheduled also. Two thumbs up!


I had questions if my old jack could be converted to electric and Conner answered
Immediately with how and the part number needed, these folks are spot on.




Great products. Other than a hard time driving out the old pin from sprocket, all parts assembled daily. Better than cutting of old assembly and welding new one one.


Exact replacement


Excellent Product. Very fast shipping. I will buy from etrailer again.


Had just what I needed at a good price. It shipped immediately . . .and my trailer is back in business.


prompt delivery. Still waiting for customer to come in for installation.


Great service great parts


Comments issues what so ever
Perry - 03/11/2022


Product worked exactly as described. I am very pleased, and it has saved my back.


Website was great. Easy to use and full of useful information. Processing was quick and order arrived promptly. I was kept informed all the way through. Will definitely reuse and recommend.


gears were right from casting ,should have been had the gear teeth cleaned and machined smooth. thank you for all the help.


Parts worked out great. Jack back in se rvice.


No problems. ...


The parts were perfect


item just as described.




Product showed up when they said it would.

Show More Reviews

See what our Experts say about this Bulldog Accessories and Parts

  • Heavy-Duty 12000 lb Bulldog Jack Replacement Cross Shaft and Bushings Recommendation
    I have an option for you, but I spoke to my contact at Bulldog to try and get a replacement cross shaft for you and he said they are not available. He said that you will just need to get a 12 inch long section of 1 inch cold rolled steel and then drill a .4 of an inch on either end of the rod 1-1/4 from the ends and then a 1/4 inch hole near the middle of the shaft but not completely centered. To get an idea what I am talking about check out the picture I attached. The Replacement Bulldog...
    view full answer...
    Image 1 for
  • Instructions for Disassembling a 12,000 lb Bulldog Jack
    I attached a picture that details how to disassemble the Bulldog 12,000 lb jacks.
    view full answer...
    Image 1 for
  • How to Install the Replacement Gear Kit for Bulldog Sidewind Jacks Part # BD500212
    In order to remove the .25" diameter pin that is included with the Replacement Gear Kit for Bulldog Sidewind Jacks part # BD500212 you will need to push the spring back to one side with a flathead screwdriver and the pin should fall right out. If it does not you may need to take a hole punch and tap it out. I have attached an install video of this process for you as well. Skip to 1:30 to see the .25" diameter pin removed.
    view full answer...
  • Replacement Repair Parts for 5th Wheel Landing Gear & Replacement Landing Gear Sets
    Since trailer makers don't maintain spec on the jacks they install (especially for a 5th wheel that is close to 17 years old) you'll want to check the jack for any part numbers to help you choose the correct repair kit. We do have bevel gear repair kits for jacks and landing gear from most major makers including Atwood, Stromberg Carlson, Fulton and others. In some cases repair kits for one brand will work fine for another since many of these products do share a common manufacturing origin,...
    view full answer...
  • What is the Purpose of the Spring Inside of a Bulldog 12K Square Jack
    The spring that comes with gear set # BD500212 for Bulldog 12K jacks is a compression spring. It keeps tension on the upper gear to help keep in place and aligned. I have included a picture that shows where the inner pieces go inside the jack.
    view full answer...
    Image 1 for
  • Inside and Outside Diameters of Bulldog # BD500212 Replacement Gear Set
    The # BD500212 Bulldog Replacement Sidewind Jack Gears are compatible with Bulldog-branded sidewind 12K capacity jacks. The larger of the two gears has an OD of 3.42 inches and an ID of .875. The smaller gear has an OD of 2.50 inches and an ID of 1 inch.
    view full answer...
    Image 1 for
  • Replacement Gear Kit for Bulldog 12,000 lb Capacity Sidewind Jack
    We do have the inner workings of a Bulldog 12,000 lb capacity sidewind jack, if you were referring to the gears. If you have a sidewind jack, the correct replacement part is the Replacement Gear Kit for Bulldog Sidewind Jacks with 12,000 lb Capacity # BD500212.
    view full answer...
  • Does Replacement Gear Kit BD500212 Fit 3-Car Trailer Jack
    The Bulldog Replacement Gear Kit # BD500212 will not fit a 3-car trailer jack; this kit is only a direct replacement for Bulldog sidewind jacks with a 12,000 lb capacity. I have added a link below to our entire selection of replacement gears for trailer jacks, though you will need to know the model and capacity of your jack to ensure you get the right replacement.
    view full answer...
  • Replacement Spring for Bulldog Sidewind Jack with 12000-lbs Capacity
    I have a solution for you, but in order to replace the spring component on your Bulldog jack you would need to purchase the entire Replacement Gear Kit for Bulldog Sidewind Jacks w/ 12,000-lb Capacity # BD500212. This would be the only way to get the appropriate spring for this jack. Parts like this do malfunction occasionally, so it might be worth having the extra parts on hand in the event that the gears stripped out at some point in the future. You could also completely change all...
    view full answer...
  • Recommended Rebuild Gear Kit for Bulldog Jack
    Without the spring that holds the shaft pin and gear in place, you likely will need to drive that pin out as it is likely pressed in. If it is really stuck in there, you may need to drill it out to ensure you don't damage the jack. Then you can use the Replacement Gear Kit for Bulldog Sidewind Jacks w/ 12,000-lb Capacity # BD500212.
    view full answer...
  • Bulldog 12k Jack Recommendation where the Pull Pin is on the Same Side as the Crank Handle
    What you would need is a Bulldog Square Jack # BD182804. This jack has the handle on the same side as the pull pin for the jack extension and should be exactly what you need. I attached a review video for this product for you to check out also.
    view full answer...
  • Repair Kit for 12000-lb-Rated Bulldog Square Tube Jack
    The Bulldog Replacement Sidewind Gear Kit # BD500212 that you referenced is the correct repair kit for your Bulldog square tube jack according to my contact at Bulldog. The top cap you can use is part # BD017802. After you repair the jack you will want to apply some general purpose grease and extend and retract the jack fully a time or two to distribute the grease before installing the new top cap.
    view full answer...
  • Are There Replacement Parts for my Frozen 12,000 lb Gooseneck Bulldog Jack
    The gooseneck trailer jacks are repairable. It is hard to say exactly what is wrong with your jack and how difficult it would be to repair, but we sell replacement parts that could fix your jack. We sell a Replacement Screw and Nut Kit, part # BD500217, as well as the Replacement Bulldog Sidewind Gear, part # BD500212, that you referenced. I would recommend that you take yours off and take it apart carefully and see if you can find what is causing the jack to be frozen and then replace...
    view full answer...
  • Replacement Screw for Bulldog 12K Jack with 1 Inch Diameter Rod
    It doesn't sound like you have a 12K Bulldog Trailer Jack as they all used a 1-1/4" diameter threaded rod both pre-2003 and post-2003. Please keep in mind that the rod is measured by the threaded portion. If you can confirm the threaded rod is measured correctly then you would need to look for other identifying marks on the jack. If none are present then the only option I have for you is a full replacement like the Bulldog Square Jack part # BD182701 which has a 12,500 lb capacity and offers...
    view full answer...
  • Gear, Bushing, & Spring Replacement Kit For Jacks Manufactured Before 2003
    On the Bulldog Powered-Drive Kit for Single-Speed Jacks w/ 12,000-lb Capacity # BD1824200100, if your jack was manufactured before 2003, you will need the replacement gear kit for sidewind jacks # BD500212 to complete installation of this drive kit. This maybe the missing piece that will make it work together. This is a gear, bushing, and spring replacement kit. If you have any further issues, I will be happy to help.
    view full answer...
  • Replacement Gears for Bulldog Sidewind Jack BD182701
    We do carry the gears for your Bulldog Jack # BD182701; you need the Replacement Gear Kit for Bulldog # BD500212. The price can be found on the linked product page. I've added a link to a video review for you to take a look at as well.
    view full answer...
  • Is Gear Kit Needed to Install Bulldog Powered-Drive Kit for 12,000 Pound Trailer Jacks
    The Replacement Gear Kit # BD500212 is only needed with the Powered-Drive Kit # BD1824200100 if the jack was manufactured before 2006.
    view full answer...
  • How to Install the Replacement Gear Kit # BD500212
    There is an initial pin that holds the shaft at the top of the jack into place. You will simply need to use a flat head screwdriver to compress the spring that is covering up that pin and the pin should fall right out. From there it is just a matter of pulling the internal gears and equipment out so that you can replace it with the Replacement Gear Kit # BD500212. I have attached a video of this process being done that you can use as a reference. This will then enable you to install the...
    view full answer...
  • Are the Spring Returns of Bulldog Jacks Repairable if the Spring Return Function Stops Working
    It sounds like you have a spring return Bulldog landing gear jack that has a broken spring and now won't retract when you activate the release lever. I spoke to my contact at Bulldog and he said the springs aren't repairable so you would need to replace the jack with something like the part # BD182701.
    view full answer...
  • Replacement Pins for Bulldog Square 12K Jack
    In order to repair a Bulldog 10K/12K Square Jack like part # BD182500 you must purchase the Replacement Gear Kit for Bulldog Sidewind Jacks w/ 12,000-lb Capacity part # BD500212. The individual replacement parts within the gear kit are no longer available separately from the manufacturer unfortunately.
    view full answer...
  • How to Access the Gears for the Heavy-Duty 12000 lb Bulldog Jacks
    To access the gears inside of the heavy-duty Bulldog jacks, like part # BD182415, you simply remove the screws that are holding on the plate covering the top of the jack. Once that plate is removed, the gears, pins and handle should be exposed. We also offer the Replacement Screw and Nut Kit, # BD500217, for the heavy-duty 12,000 lb capacity Bulldog jacks. I have attached two photos that show the inner workings of the heavy-duty Bulldog jacks for you to check out. The cross shaft that...
    view full answer...
    Image 1 for Image 2 for
  • Can The Bulldog Square Jack, # BD182500, Be Rebuilt And Are Replacement Parts Available
    We do sell replacement parts for the Bulldog Square Jack - Fixed Leg - Sidewind, # BD182500. We have the Bulldog Replacement Sidewind Gears, # BD500212, which are the gears located at the top of the jack that the sidewind crank would be connected to. We have a replacement nut and screw repair kit that is for the nut and screw that is located at the bottom of the jack. This is the screw that will raise and lower the leg. The available kit is for jacks manufactured after 2003. The part...
    view full answer...
  • Converting Bulldog Square Jack From Manual to Powered
    Thanks for the photo; we do need to know the landing gear manufacturer to get you the right parts so what I recommend you do is contact the trailer manufacturer and inquire about the landing gear. If you let me know what you have I will be happy to find out what motor could be added.
    view full answer...
    Image 1 for
  • Bulldog Jack Gear Compatibility With Stallion Brand Jack And Electric Conversion Kit
    The Bulldog Powered-Drive Kit for Single-Speed Jacks w/ 12,000-lb Capacity # BD1824200100 will allow a single speed jack with 12K capacity to become a powered drive jack. The Replacement Gear Kit for Bulldog Sidewind Jacks w/ 12,000-lb Capacity # BD500212 may work with your Stallion brand spring loaded drop leg jack, but I can't confirm it will work without replacing the screw and nut kit # BD500217. I know customers have changed this screw and nut assembly on a stallion jack without...
    view full answer...

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