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Re: Craftsman floor jack rebuild [Re: i6pwr] #5114660 05/24/19 02:04 PM
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DoubleNickels Offline
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No real answer to that. Different circumstances vary, and there's no guide. Ask an elevator tech, since it's the same hydraulic principal in action. Ask a forklift shop, since it's the same hydraulic system. Ask any auto shop with a lift, how often they change it out.

Re: Craftsman floor jack rebuild [Re: philipp10] #5115903 05/25/19 09:50 PM
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Dave9 Offline
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Originally Posted by philipp10
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

Nonsense.

Jack hydraulic fluid never needs changed, unless you're talking about every 20 years.

I have to wonder if you are posting into the wrong topic and thought we were talking about transmissions instead of jacks.

Last edited by Dave9; 05/25/19 09:51 PM.
Re: Craftsman floor jack rebuild [Re: i6pwr] #5118001 05/28/19 08:47 AM
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NYEngineer Offline
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I have a Craftsman 3 ton jack that I've had for probably 15 years. The all black one. It's been good until recently. It doesn't leak externally but it leaks down.
I also just bought the yellow 3 ton Daytona jack from HF and I love it. I was going to put the Craftsman jack on the curb and go buy another HF jack this past weekend with the 25% off coupon they sent me but when I got to the counter with the jack and presented my coupon, I was told it did not apply to jacks. I left without a jack.
SO... Now I have a newfound interest in fixing my Craftsman jack. Anyone done this? Probably just a seal kit. I've rebuilt forklift rams so this probably isn't a big deal.

Last edited by NYEngineer; 05/28/19 08:48 AM.
Re: Craftsman floor jack rebuild [Re: i6pwr] #5118919 05/29/19 05:50 AM
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HangFire Offline
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If you re-read this thread, you'll see I have done it.

Before rebuilding, check fluid level and do the air bleed procedure, especially if the jack was stored on its side. Jack oil is cheap, and if you do rebuild, you will need it anyway.


Various musings: http://hangfire.net
Re: Craftsman floor jack rebuild [Re: HangFire] #5118925 05/29/19 06:07 AM
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NYEngineer Offline
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Originally Posted by HangFire
If you re-read this thread, you'll see I have done it.

Before rebuilding, check fluid level and do the air bleed procedure, especially if the jack was stored on its side. Jack oil is cheap, and if you do rebuild, you will need it anyway.



Yep. Fluid is full and no air. Jack's also never been on it's side. I'm just going to fix it. Looks like a kit is under thirty bucks.

Re: Craftsman floor jack rebuild [Re: i6pwr] #5118988 05/29/19 07:41 AM
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ccs368 Offline
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I have the 3 ton craftsman floor jack that was seldomly used and about 25+ years old. Last year it was very slow to raise the saddle and took about 30 pumps just to raise several inches. So wasn't confident it was going to raise and hold a car's weight safely for a minute. Carefully removed the cap to the hydraulic cylinder and disabled the valve (counter clockwise) all the way and slowly pumped full lever travel like 50 times. Then I replenished the fluid through that same access hole to just shy of filling by 1/8" with floor jack hydraulic specific oil. Reinstall and engage valve (clockwise) and try to lift a car. After repeating this twice, I can raise the saddle and car to maximum height in 10 pumps and you can feel the resistance in the handle now. The mistake I did was opening and filling the two visible holes in the front which didn't help me solve my issue.

Still no problems today. Same procedure as what was in the YouTube videos.


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Re: Craftsman floor jack rebuild [Re: i6pwr] #5119005 05/29/19 07:55 AM
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WyrTwister Offline
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I have an off brand floor jack that leaks out fluid . Have to add fluid every time or every second time I use it .

Seems like I have read that O-Rings are used to rebuild a floor jack ? Special O-Rings or " standard " O-Rings ? Black or green O-Rings , or does it matter ?


Wyr
God bless
Re: Craftsman floor jack rebuild [Re: i6pwr] #5119228 05/29/19 11:15 AM
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LeakySeals Offline
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I have a 3 year old black craftsman 3 ton. Looks pretty much like that. Was leaking early on but I was able to resolve it. Leaking where you pump the piston with the handle. Whatever that shaft is called. It must remain perfectly clean. No garage debris can get in there or it will cause the seal to leak. The other thing that was causing the seal to leak was air. I found this out because I was unable to find the right parts for that Jack so I tried fixing what was there and it's been good for the past 2 years. I removed the handle and that metal shaft. Pulled the oring out, cleaned everything out and put it back together. Use syl glyde on the oring when reinstalling shaft. Replaced all the jack fluid with the fluid you can buy everywhere . The one with the seal conditioner. Then once it was full the bleeding was critical. Pump it up and down a few times and then push on the rubber seal where you add fluid with a flathead screwdriver. Too much air will cause it to leak out the seals too.

I had given up on the Craftsman and started buying Harbor Freight 3 ton jacks. They are cheap. No problems with those either. What I like about the Harbor Freight Jack is it lifts up quicker then the Craftsman does. But that Craftsman is working fine now so I use the two of them. If I were to replace it I think it's Lowe's now that bought Craftsman but I would just buy more of the Harbor Freight jacks. No point in fixing them anymore they are so cheap

A clean Jack is a happy jack


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