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Craftsman floor jack rebuild #5113488 05/23/19 01:14 PM
Joined: May 2008
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i6pwr Offline OP
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Surely enough as I'm nearing the end of my rod bearing replacement, my floor jack decides to start leaking down.

This is the jack, has anyone rebuilt these and/or replaced any seals?

I can crank the handle down as hard as I can but it will slowly drop with weight on the cup.

I don't think its low on oil, but possibly.

All input appreciated.

Screenshot_20190523-140510_Gallery.jpgScreenshot_20190523-140528_Gallery.jpg
Re: Craftsman floor jack rebuild [Re: i6pwr] #5113499 05/23/19 01:25 PM
Joined: Jan 2017
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maxdustington Offline
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Check out the jack repair threads on The Garage Journal. Import jacks seem to be fairly generic, so you can probably rebuild it. Old imports might be worth it (1970s-1980s), but new ones probably aren't unless you are looking for a project. You might need a pin spanner to get the tank nut off, but this one might not require that tool.


97 GMC RCLB K2500LD L30/4L60
Re: Craftsman floor jack rebuild [Re: i6pwr] #5113528 05/23/19 01:46 PM
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Touring5 Offline
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That looks exactly like my (leaky) Craftsman jack. I got mine around 2003? I happened across a video that explained how to replace the o-rings, but I could never get the nut off the cylinder. I believe these jacks are examples of how far Craftsman had fallen - just Chinese jacks painted and labeled for Sears. As I recall the jack only had a 90-day warranty.


https://m.youtube.com/watch?v=vIp8GO5PIFA



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Re: Craftsman floor jack rebuild [Re: i6pwr] #5113582 05/23/19 02:33 PM
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Dave9 Offline
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^ How far they've fallen? I consider it reasonable service life to get 16 years out of a *budget* jack before it needs repaired.

I have an older version of that C-Man, back when they made them just as sturdy but were rated for only 2.(something) tons and were light silver with a black handle.

I do recall that once I had my C-Man on its side or upside down or something (I was cleaning it, IIRC) and had to bleed air out and top off the fluid to get it to stay up, and it has worked fine since then.

Definitely try to bleed it and top off the oil before planning a rebuild. It also looks like it could use some cleaning and lubing from the second pic.

Re: Craftsman floor jack rebuild [Re: i6pwr] #5113585 05/23/19 02:36 PM
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DoubleNickels Offline
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Hydraulic fluid is not leaking. Maybe it's all leaked out.

First, purge air from the system. Then top off fluid. Now clean off exterior and lubricate all moving parts. If all is well, it will work. If not, you will see the leak. If there's a leak, you will need new seals, gaskets, and o-rings.

Re: Craftsman floor jack rebuild [Re: i6pwr] #5113611 05/23/19 03:05 PM
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i6pwr Offline OP
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I agree it's not the cleanest, I had just finished R&R my oil pan to replace rod bearings, and the jack has seen its share of fluids from the vehicle during the whole process.

It will lift all the way up, just won't hold a reasonably heavy load...over maybe 100 lbs. It will very, very slowly leak down, holding up a crossmember under the trans, it leaks down about maybe 1/4" per second.

It has a rubber plug on the cylinder and if I try to pry it up I can hear air either escaping to trying to enter.

Re: Craftsman floor jack rebuild [Re: i6pwr] #5113635 05/23/19 03:20 PM
Joined: May 2014
Posts: 4,294
Yah-Tah-Hey Offline
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You can find rebuild kits on the internet. I have a Craftsman 2 ton floor jack purchased in the 1980. Have changed fluid regularly. One thing I have noticed is the jack will puke oil out the fill plug if filled with too much oil. Search for repair kits by entering your jack's model number.

Re: Craftsman floor jack rebuild [Re: i6pwr] #5113660 05/23/19 03:43 PM
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CT8 Offline
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Buy a new jack.


2015 F150 2.7
2018 F350 6.2
Re: Craftsman floor jack rebuild [Re: Touring5] #5113774 05/23/19 05:36 PM
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maxdustington Offline
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Originally Posted by Touring5
That looks exactly like my (leaky) Craftsman jack. I got mine around 2003? I happened across a video that explained how to replace the o-rings, but I could never get the nut off the cylinder. I believe these jacks are examples of how far Craftsman had fallen - just Chinese jacks painted and labeled for Sears. As I recall the jack only had a 90-day warranty.


https://m.youtube.com/watch?v=vIp8GO5PIFA
They were rebranding Japanese jacks as early as the late 1960s IIRC. 1970s for sure.


97 GMC RCLB K2500LD L30/4L60
Re: Craftsman floor jack rebuild [Re: i6pwr] #5113779 05/23/19 05:41 PM
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Posts: 392
KJSmith Offline
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Last edited by KJSmith; 05/23/19 05:44 PM.
Re: Craftsman floor jack rebuild [Re: i6pwr] #5113791 05/23/19 06:01 PM
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OnTheRocks Offline
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Start with cleaning and lubricating. Get fresh fluid. Be sure to buy hydraulic fluid sold as jack oil. Do not substitute with transmission fluid, motor oil, brake fluid, or anything else you think will work. Drain the jack. Add fresh fluid. Purge air. Then top off the jack. You may not need to rebuild at all. Plenty of videos online showing you how to purge the air and refill the jack.







Re: Craftsman floor jack rebuild [Re: i6pwr] #5113844 05/23/19 06:52 PM
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HangFire Offline
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In rebuilt my 3-ton, 1990's, Japan built floor jack over the New Year's holiday. Half the battle is identifying the right parts kit. It will come with extra parts, for similar jacks, which always makes it interesting. For my jack, the main problem was the large seal at the end of the ram had shrunk over time. I replaced everything soft, and the ball bearings. Should be good for another 30 years.

I got my kit from Lazzar's Floor Jack aka HCRCnow.com. If you can't identify the jack from their website and your jack markings, give them a call.

When my jack started bleeding down, everything in my garage ground to a halt. I almost purchased a HF jack, glad I didn't. I spent $60 for a rebuild kit, would have spent $90 for a HF jack, but it wouldn't be the rebuildable plate steel 85 pound beast that this thing is.

jackfix_10x7_143552095.jpgjackfix_10x7_144734453.jpgjackfix_10x7_175237323.jpgjackfix_10x7_175243948.jpgrings_10x7_BURST001.jpg

Various musings: http://hangfire.net
Re: Craftsman floor jack rebuild [Re: i6pwr] #5113880 05/23/19 07:21 PM
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OnTheRocks Offline
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At the heart of almost every piece of hydraulic lift equipment - pallet jack, floor jack, et cetera - there is a simple bottle jack or similar operating system. Fluid in one reservoir, gets pumped into another reservoir, whereby pushing a piston. Almost every one I've seen is the same. Those pieces all have gaskets, seals, and o-rings. These wear items eventually give out, and fluid leaks. Even if you can't find your jack model - and you should be able to since that Craftsman jack is so common that hundreds of thousands were probably sold - you can always take any jack apart, then order the seals, gaskets, and o-rings by diameter size. Parts sellers will have a whatever diameter gasket, if you ask for it. A gasket, seal, or whatever, will work in any and every jack, as long as you are using the correct size.

Re: Craftsman floor jack rebuild [Re: i6pwr] #5113959 05/23/19 08:30 PM
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philipp10 Offline
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oh I'm sure if you had changed the oil on a regular basis you wouldn't be having these issues.....but don't go and have a flush now....much too risky... crush

Last edited by philipp10; 05/23/19 08:30 PM.
Re: Craftsman floor jack rebuild [Re: i6pwr] #5114112 05/23/19 11:52 PM
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Gasbuggy Offline
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How often should you change the hydrauilic fluid?


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