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Replacement Gearbox Cover for Sidewind Bulldog Trailer Jacks with External Gear Boxes

Replacement Gearbox Cover for Sidewind Bulldog Trailer Jacks with External Gear Boxes

Item # BD500205
Our Price: $14.00
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Shipping Weight: 0.41 lbs
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Replaces the gearbox cover for your Bulldog sidewind trailer jack with an external gearbox. Protects the gears from dust, moisture, and damage. Includes the hardware needed to install on your jack. 1-800-940-8924 to order Bulldog accessories and parts part number BD500205 or order online at Free expert support on all Bulldog products. Great prices and Fastest Shipping for Replacement Gearbox Cover for Sidewind Bulldog Trailer Jacks with External Gear Boxes. Accessories and Parts reviews from real customers.
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  • Reviews (24)
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  • Videos (1)
  • Photos

Bulldog Accessories and Parts - BD500205

  • Camper Jacks
  • Trailer Jack
  • Covers
  • Gearbox Cover
  • Bulldog

Replaces the gearbox cover for your Bulldog sidewind trailer jack with an external gearbox. Protects the gears from dust, moisture, and damage. Includes the hardware needed to install on your jack.


  • Replaces the gearbox cover for your Bulldog sidewind trailer jack with an external gearbox
  • Protects the gears from dust, moisture, and damage
  • Includes the hardware needed to install on your jack


  • All Bulldog sidewind trailer jacks with an external gearbox

Diagram pointing to the gear box cover

500205 Replacement Gear Box Cover for Side Wind Bull Dog Trailer Jacks with External Gear Boxes

Video of Replacement Gearbox Cover for Sidewind Bulldog Trailer Jacks with External Gear Boxes

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Bulldog Jacks Replacement Sidewind Gear Kit Review

Today we're going to be taking a look at the rebuild process on the Bulldog 190 Series Square Jack, and the Fulton 5000-pound lift capacity Square Jack. This has an 8000-pound static capacity just like the Bulldog jack does here. These are going to have the 2 inch outer tubes, of course, square. The 2 inch inner tube on both of them there, and the metal cap is going to look like that. It has two bolts that hold it in place. Now, to rebuild our jack we're going to have a few components here.

First, we'll start off with part number BD500156. This is going to be our gear kit. Now, this is kind of a universal gear kit for a lot of the Fulton and Bulldog jacks. Its going to come with two base gears. We'll be using the one with the larger diameter hole in it, and I have a new pin for that to ride on.

Got a new shear pin here for our handle gear. Its what turns that base gear, rotates it, and that what runs our screw up and down, and makes our jack work. We also have a metal bearing. Now, this is kind of an enclosed bearing. You see its got a cap on the top thats going to help keep out any moisture that comes down, and then the bottom, thats going to rotate on our thrust washer there, or on the thrust bearing. That eliminates any of the friction, and its going to help our jack last for a good long time.

Now, the bushing with the larger diameter opening you see here is going to go around the screw in a downward fashion. The bearing kit, that is part number BD500224. You want to get the handle kit, which is part number BD500171. Thats going to have the handle, a new shear pin, and then the flange bushings for either side there. Then if your caps been damaged this is a pretty integral part of the jack. This is whats going to keep the moisture and the dirt out of our gear kit.

Its going to keep it from running down into the inner tube of the jack. This is going to be part number BD500205. Now, the toolkit youre going to need is pretty simple here. Weve got a ratchet. This has an 11-mm socket on it. We also have a hammer. We got a 1/8 inch, and a 5/32 punch, and also a pair of needle nose. It's really all we're going to need to get this done with the exceptions of a little bit of grease. It doesnt have to necessarily be high temp or high load grease, but you do want a quality grease, and some shop towels. Now, the two bolts that pass through the cap, you can see theyve got lock nuts on the end of them there. You can see that ones not even really tightened down. You want to tighten it down at least till it makes contact. We're going to loosen these up. Get those bolts removed. Then our cap should just lift straight off of there. If we rotate it well see our gears there. Got our handle gear there, and you can see its just going to turn that base gear that turns the screw, which causes it to go up and down. Now, lets wipe that grease out of there so we can see where our pins are located. If we rotate our handle, you can see right here theres a little indention in that gear. Thats where that shear pin passes through. What well do is take our hammer. We're going to start to drive that out. Lets bring that out. Well set that aside. Then we can just gently pull back on that handle and it will slide right out of our gear, and thats the hole our shear pin went through, so thats what ties the handle and the gear together. Lift our gear up. Then with the handle kit, these are those replacement bushings. Now, for the base gear all we have to do there is just lift up. You can see thats going to come right off the pin. Then again we've got that larger diameter hole in the gear, so well be using that one. Now, we're going to, of course, just clean these parts up and put them back in. These dont need to be rebuilt. You get the idea of where the replacement parts will come into play. You can probably slide it out by hand, but just grab that pin with needle nose you can pull it right out of there. Next, we got a couple of washers here. You can see that other bushing. Now, well just lift up on that outer tube. Youll see its going to slide right off of our inner tube. We can see that bearing, and that thrust washer. Basically, this washer rides on the outer tube. It sits right here, so as the screw turns, as it goes lower that allows the outer tube to lower down on, and then as it extends, or as it pushes up that bearings just going to spin allowing the rotation, and reducing the friction between that top plate, so really hard to damage the screw portion of the jack. Most of your damage is going to occur if your handle gets in a bind, and you push it too far, something like that, or if the cap deteriorates, and you get moisture down in there. Just a quick, easy rebuild process for you. Well get it put back together now. That thrust washer, and that bearing that came with the kit, so you just want to keep that in mind. Youll slide that new portion down on there. Bring that outer tube right back down over. Youll see that screw just passes right up in there. This plate sets right down on that bearing. Take the flange bushing with the larger diameter hole, and get that lined up, and slide down there. We can replace that flat washer. Now, that thicker diameter pin that was a little bit shorter, just a smooth pin, it's going to fit right in this opening. We want to capture that pin right in that opening on the bottom of the gear just like that. Then we can put our flange bushings back in both sides. We want to take our new handle gear, and place it down and in, so make sure our gears mesh up there. Slide through our handle. Its going to go all the way through. Then the hole in the handle, we need to get that aligned with the opening on our gear, so we can put in our pin. It will be about right there. Take our new shear pin. Place that down and in. Then we can drive it in from that point about midway. All right, now well grab our new grease here, get that spread all around our gears. Certainly, dont want so much that its running out of the cap of the jack or anything, but you can put plenty in there. You aint going to hurt anything. Then with the grease gun, you have a grease Zerk 00:07:40 right there that'll allow you to grease that screw. Now, well just have to slide our new cap on there. You want to place the bolts in with the rounded portion of that carriage bolt facing the handle. We go through the other way youll see that bolt head kind of sticks out there, and we want to reduce that. Thats all there is to it. You can see back nice and smooth operation. We hope that shows you with a little bit of time and a few parts you can rebuild your jack rather than going through a complete replacement process.

Customer Satisfaction Score:

Customer Reviews

Replacement Gearbox Cover for Sidewind Bulldog Trailer Jacks with External Gear Boxes - BD500205

Average Customer Rating:  4.8 out of 5 stars   (24 Customer Reviews)

Replaces the gearbox cover for your Bulldog sidewind trailer jack with an external gearbox. Protects the gears from dust, moisture, and damage. Includes the hardware needed to install on your jack.


no problem at all with my order.
buy from again.


Items were delivered as described and worked perfectly. They were ordered to repair a damaged jack and worked perfect for the use. Sorry didn't get any pictures, but I was told i couldn't repair the jack but E-Trailer and I proved them wrong.


This fit my jack perfectly. Britney was extremely helpful in filling this order which was fairly minimal from a price standpoint. She took it and ran with it and managed to get me the piece that I needed for my jack. I was totally impressed with her professionalism and her effort. This is the first time I order from the trailer but definitely won’t be the last. I was 100% satisfied and then some!


The parts are what I needed to get my jack back a-one shape. Thanks for having Bulldog jack parts in stock and shipping quickly.


Product was exactly as described and was a direct replacement. Thanks for the fas 5t response

Russell A.


Jack is still working as it should.


Exactly what we needed to repair our trailer jack. I was kept up-to-date on when part was being shipped. Very satisfied. Thank you.


Haven't yet used this repair part. Seems like it will work, but might be a little large for my application.


Just like new. Thanks


Good product and fast service.

Derrell F.


Works fine


Good stuff never dissatisfied with etrailer


Order came quick an was what 2 expected.


Made a Perfect repair. Thanks again. r>


Thank You for the quick and professional experience. I’d definitely shop here again


Fast shipment. Fit perfectly.




Process was quick and painless ... awes ome!


Fast, efficient and reasonable!










See what our Experts say about this Bulldog Accessories and Parts

  • Replacement Cap Recommendation for Bulldog Square Jack # BD500205
    You are looking for the Bulldog replacement cap part # BD500205 for your Bulldog Jack part # BD190754.
    view full answer...
  • Replacement Parts for an 8,000 lb. Square Bulldog Jack
    For your 8000 lb. square Bulldog Jack we have the Replacement Thrust Bearing Kit # BD500224 and the Replacement Cap # BD500205 available as replacement parts for a series 190 Bulldog jack which is 8,000 lbs. I am not completely sure what you mean by cover (if it is the cap then you are good), if you could send in pictures or a little more info I would be happy to look further into the cover for you if the cap is not what you meant by cover.
    view full answer...
  • Availability of Replacment Gear Kit for Fulton 5K Heavy Duty Jack
    I spoke with my contact at Cequent and he said if your Fulton 5K HD trailer jack, # HD50000101, has the Bulldog end cap with the hourglass design, part # BD500205, then, yes, you can use the Replacement Sidewind Gear Kit for Bulldog Jacks, part # BD500156. If you are using one of the older models of the Fulton 5K HD jack there is no gear kit available.
    view full answer...
  • Replacement Parts For Fulton 5000lb Jack # 2840025
    Absolutely! I reached out to my contact at Fulton and for your Fulton 2840025 you will need the following parts: Gear Kit # BD500106 Bearing Kit # BD500224 Replacement Handle Kit # BD500171 Replacement Cap # BD500205 The handle kit that was originally on your jack is not sold as a replacement part, but he mentioned that that # BD500171 will work just fine in your jack. I included a video of these parts being used to rebuild a jack for you to take a look at.
    view full answer...
  • Trailer Jack Cap Solution for Top of Bulldog Jack
    I have a couple options. Does your cap look like the part # BD500205 or does it look like the # F0917504-00? These are the two square cap options we have for the jacks made by the same company as Bulldog. Otherwise could you send me a picture of what you have.
    view full answer...
    Image 1 for Image 2 for
  • Replacement Thrust Bearing Options for an Unknown Square Side Crank Camper Jack
    I see that you got the Replacement Cap for etrailer and Ram Square, Sidewind Jacks # TJD-7000S-CP, which indicates that you have a square side crank jack. I have listed the square jack thrust bearings that we have below, along with their OD/ID, we do not have anything that matches perfectly. - Replacement Thrust Bearing Kit for Bulldog Trailer Jacks # BD500224 (ID 0.63" & OD 1.42") - Replacement Bearing for etrailer and Ram Square Jacks # TJD-7000-BR (ID 0.756" & OD 1.519") - Replacement...
    view full answer...

Do you have a question about this Accessories and Part?

Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video Edited:
Kathleen M
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Randy B
Installed by:
Randy B

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