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Old 08-23-2020, 02:23 PM
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Default Leaky Floor Jack

I have a Big Red (Torin) 3.5 ton floor jack that has been getting the job done for several years now. I noticed a while ago, that sometimes a pump stroke would only result in a partial lift in height, but alway something. It seems to be more of an issue when close to the top. More recently, I’ve noticed it leaking oil after use, either when left not fully lowered or after use when pushed back into its storage location.

This was a $200 (on sale $99) jack, so extremely likely it uses o-ring seals versus u-cups.

I have several of the multi-size o-ring kits so there is a chance I would already have a suitably sized replacements .

I believe I have two issues, one on the pump piston and another on the ram. Probably both failing O-Rings. Any good resources to point me to before I tear into it? Or better to wait for a sale and just replace it?

Thoughts? Getting tired of oil pools and topping it up.




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  #2  
Old 08-23-2020, 04:24 PM
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o help on resources, but sounds like it ought to be a fairly simple repair project to replace a couple O rings.
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Old 08-23-2020, 04:36 PM
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Ace hardware has been a source of o rings in the past .
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Old 08-23-2020, 05:56 PM
slip knot slip knot is offline
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youtube has lots of videos on rebuilding floor jacks. Not really all that complicated. I've resealed a few and it took the standard o-rings from my assorted sets.
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Old 08-31-2020, 05:42 PM
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So what oil goes back in my floor jack? What came out looked almost like gear oil - which is not what I was expecting to find.

A quick look at the fluids shelf spotted
5w20, 10w30 and 15w40 motor oil
Various gear oils 90w through 80w130
hydraulic oils - "normal" and JD Lo-Vis
ATF - Mercon V
plus all kinds of other obviously non-suitable stuff from brake fluid through chain oil.
With probably 50 gallons of fluids there - almost certain the answer is going to be none of the above
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Old 08-31-2020, 06:22 PM
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Quote:
Originally Posted by Big_Eddy View Post
So what oil goes back in my floor jack? What came out looked almost like gear oil - which is not what I was expecting to find.

A quick look at the fluids shelf spotted
5w20, 10w30 and 15w40 motor oil
Various gear oils 90w through 80w130
hydraulic oils - "normal" and JD Lo-Vis
ATF - Mercon V
plus all kinds of other obviously non-suitable stuff from brake fluid through chain oil.
With probably 50 gallons of fluids there - almost certain the answer is going to be none of the above
I have used ATF and seems to work fine for me. Suppose hydraulic jack oil would be the thing.
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Old 09-01-2020, 02:28 AM
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GWIZ GWIZ is offline
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Quote:
Originally Posted by Big_Eddy View Post
So what oil goes back in my floor jack? What came out looked almost like gear oil - which is not what I was expecting to find.
Not to long a go I purchased some Jack oil, STP 32oz for about $6.50 from a local auto parts store, it was the last one they had
seems stores are running out of quite a few things I suggest you call first if its out of your way.

In my case a small cheap floor-jack leaked from day one only used it about 15 times over 15 years.

same as the thread about cleaning out the horizontal band-saw gear box.
The jack was full of grit, sand, cast-iron filings ......
I changed the ram O-ring to stop the leak but there is quite a bit of wear on the cup piston seal.

The issue is a floor jack lays horizontal and any grit that is in the cylinder also lays on the bottom of the cylinder and any grit will saw into the low-side of the cup seal.

I would suggest to everyone check the oil
Shake their jack around mix-up the oil and then take out the filler cap and check the color of the oil
my old oil should have been a light blue and clear.
it came out cloudy gray and silver, and about a teaspoon of grit.

the STP jack oil is clear and very thin.

I'm also thinking if it is a good idea or not, set the floor jack in the vertical position once in a while and cycle the jack
thinking it may move any grit, water back into the reservoir.
my jack has a filter but the cylinder was full of machining chips.
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Old 09-01-2020, 03:13 AM
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Quote:
Originally Posted by milomilo View Post
I have used ATF and seems to work fine for me. Suppose hydraulic jack oil would be the thing.
Yeah, me too, anytime they needed topped off. High detergent ATF seems to work just fine..
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Old 09-01-2020, 09:18 PM
slip knot slip knot is offline
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I used the same hydraulic oil I run in the tractor hydraulics.
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  #10  
Old 10-20-2020, 04:53 AM
bunkclimber bunkclimber is offline
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Default leaky floor jack

Quote:
Originally Posted by GWIZ View Post

I would suggest to everyone check the oil
Shake their jack around mix-up the oil
Milwaukee 8000lb floor jack..at 200lbs are you out of your mind
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