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Discussion Starter #1
I have been wanting a floor jack to keep in my trailer for a while and these harbor freight coupons keep tempting me so I went and picked one up.

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It seems to be pretty well built and it picked up a front corner of my D-max without too much trouble so I figure it will be fine for my buggy. Only problems with it are it does not lift very high and it does not roll on dirt very well. I decided some mods were in order.

I started with the front end, these things come with a little 1.5" dia roller as a front wheel. That was not going to cut it in the dirt so I picked up a pair of 8" solid rubber tires from harbor for $6 each.

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To put the bigger tires on I needed a new front axle. The axle is made from 5/8" solid rod, I welded a washer to one end and drilled/tapped the other for a 3/8" bolt.

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Next up I drilled the holes in the jack out to 5/8 to accept the new axle

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Discussion Starter #2
I needed a center spacer and some little spacers to go between the side plates and the new wheels so I whipped some up out of 7/8"x.120 DOM

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The side handle was in the way of the new tired so I flipped it around and drilled one new mounting hole

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Now that the front sits 3" higher I needed to lift the rear and I also wanted to upgrade the tiny little rear castors. I dug up some bigger casters that I kept off an old dead jack, just drilled the holes a little bigger and bolted them on. It still sits a little high in the front but it works. One of these days I will make some new brackets to level it out

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Here it is all done, it lifts 3" higher, is much wider/more stable, and it rolls over grass and dirt super easily

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Here are some rough measurements on the parts. You have to be very careful not make the axle too short, if the axle is too short it will put a side load on the bearings in the new wheels and bind them up. Also pay attention to the wheels, the hub is not centered, I installed mine offset out (it will make sense when you see them)

Axle-10"
Center spacer- 4.7"
Side spacers- .300"
 

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Discussion Starter #3
After modding the jack I had the old front "wheel" laying around so I turned it into a roller stand to hold long tubes when cutting them on my horizontal band saw
 

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Interesting. I keep wanting one of those little jacks for similar reasons - easy to throw into a vehicle and take to CL deals, etc where the seller has been too lazy or stupid to pull wheels they're selling, or other reasons you might need to elevate a vehicle slightly
 

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are you planning on blocking under the jack, or letting the weight sit on those huge wheels?

Be careful, I can see the jack tipping over or those wheels folding up if side loaded.


I've been wanting to build one on a ski for lifting ice shacks on the lake.
 

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Discussion Starter #7
are you planning on blocking under the jack, or letting the weight sit on those huge wheels?

Be careful, I can see the jack tipping over or those wheels folding up if side loaded.


I've been wanting to build one on a ski for lifting ice shacks on the lake.
As far as tipping over goes it is more stable than it was stock. It just came with a roller between the side plates, I doubled it's width by putting the tires outside the side plates. The tires are solid rubber so there is virtually no "squish" to them

I picked up my D-max with it after the mods and nothing failed so I think it will be fine for my 2700lb buggy. I would not get under anything held up by it just like I would not get under something held up by any other floor jack.
 

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Nice kit Andrew. Are you selling these or just giving us the info? I have a 3 ton Alum Jack that I would like to do that to, wheels are getting beat up and hard to roll.
 

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Discussion Starter #10
Thanks Tom, just sharing the info. It is pretty easy to do and I don't plan on making a kit or anything. I am sure you could do something similar on 3 ton but I don't know if these wheels would actually hold up to that much weight. I have lifted around 2000lbs with it and they held up fine, just not sure what their real world limit is
 

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Discussion Starter #13
This jack is on sale again. Amy updates on this? Ever level out the back?
Still working good. One of the tires split but I think it was a bad batch of rubber rather than overloading. They are only $6 so I just threw a new one on.

I have not leveled it out yet. I just got a mill and it is on my list of shit to make with it once I get it set up.
 

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I saw this at EJS a few years ago. Thought it was neat.
That's a great idea when your hub is laying on the ground, or the tire is airless, and you need to jack up the axle :flipoff2:
 

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I've seen a bunch of them with the wheels removed and a skid plate installed on the bottom the jack, no wheels to try and roll and they work in the rocks. I think I saw a thread with a guy selling them, built out of the HF aluminum race jacks.
 

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Alot of neat Ideas here but I hate the small HF Race jacks cause the frames always seem to twist and then are worthless .. I have 2 of them that are broke from the frames twisting .. I just upgraded to the bigger model and love them so much better..
 
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