Craftsman 4 Ton Floor Jack Rebuild Kit

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Craftsman Flooring Jack Rebuild? (2 Viewers)

• Thread starter 1973Guppie
• Start date November 23, 2009
• Watchers 2

1973Guppie

• #1

I have a 3.5 ton craftsman floor jack that is nearly 16 years old. Near six months ago, it started not working and I put some more than oil in it and information technology worked alright once again. Lately it but will elevator a load upwardly to most 1/3 height it used to. I am wondering if this affair is even worth rebuilding? When I pump information technology up with no load it pumps up prissy and loftier, but with a machine nether it, information technology volition only lift upward so high, which is getting very annoying as I utilize it oft. Has anyone rebuilt these and practise they reccomend doing and then? I am thinking that there is a seal going bad as it just seems to not hold any weight anymore.

thx, Noah

pb4ugo

• #ii

Has it leaked any oil?

I had a sometime floor jack that slowly leaked down and didn't go upwards all the way too, merely never leaked fluid.
I was because rebuilding it, until I found a web site that mentioned w/these charachteristics
that the valve was probably chock-full. The set as I call back is. West/the jack downwardly shut the valve and lift upward the arm all the way up. It should stay up nearly of the way. Put weight on the jack/arm(I but stood on information technology,240lbs) and release the valve quickly. I did this a couple of times and at present it works well. I notwithstanding leaks down ever so slowly, but mode better than information technology was b4 and goes up to full height. Good Luck!

Final edited: Nov 24, 2009

1973Guppie

• Thread starter
• #3

weird matter is that it never has leaked oil before, only I went to fill information technology up with oil and it took a bunch to make full information technology upwards and so ? works fine now, only used gear oil, which I know is not right, but the jack is and then old whatsoever, I was out of hydraulic oil, I will use it till it finally craps out on me, xvi years and going.......

Blue77FJ40

Joined

Nov 30, 2004

Letters

2,628

Location

Md

• #4

The Otto Service Company, Hydraulic Jacks Home Folio has a great site with a lot of info on all types of jacks. Years ago, I bought a rebuild kit from them for a small Walker bottle jack and rebuilt it per their instructions, so far, and then good. I don't think that they sell parts anymore, but jacks.

1973Guppie

• Thread starter
• #v

I looked for parts on sears website and they are no longer available, it still works simply I only bought a harbor freight ane for like lx bucks on sale, we live in a throwaway order now, don't hold with it simply it is what it is......

FJ40Jim

The Cruiser Whisperer

• #6

I searched for info on repairing the common Craftsman (China) floor jack, didn't find much in the How-To department.

Mine was leaking fluid when parked, so bad that in a twenty-four hour period or ii information technology would just be able to lift a few inches, which is worthless for picking up a Cruiser. I got tired of filling it with oil (and mopping up nether it the next day) every time it was needed. Before I went down to Horrible Freight to buy another china junk jack, I decided to dismantle and see what I could see.

The hydraulic ram assembly was easily removed from the bottom of the frame. And so it was clamped upright in the vise. A 54mm hub socket and inpact gun removed the big hexnut from the top of the cylinder. Within the hex is the o-ring that seals the piston. The o-band had been improperly installed by the goatherder who built it, and so it was twisted in it'south groove. The jack has worked fine for several years, but the twisted o-ring finally decided to tear where it was wrinkled in the groove.

A trip to the parts store with seal nut & ram piston in hand turned upward a perfect replacement o-ring- 1-5/8 OD x i/8 section. The scratches and rust spots were polished off the piston, then everything was cleaned & slicked up westward/ vaseline. Assembly was reverse of removal, except I did not use the impact, merely a long 1/two"ratchet.

The first few uses of the jack had actually bad lifting performance, simply now it seems to have bled out the air pockets and is working proficient as new. No leaking out the ram o-band, and lift operation is strong from height to lesser.

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