Milwaukee model40 floor jack help

[wookie]

Hi all,

I'm new to this site and have amilwaukee model 40 floor jack that when I got it leake fluid from the piston. I filled it with fluid and it raised and lowered but is still leaking when I leave it up. This jackwas in storage for many years and I would like to repaire it. I was told a person by the name of highbal was the person to talk with. Any help would be great help..

Thanks,
Steve

 

[CamarosRus]

Hello Wookie and welcome aboard...........

I'm sure Hiball (Jack EXPERT) will respond

 

[GeorgiaHybrid]

wookie,

Are you from the BITOG site? If so, welcome to the madness here. I'm sure Hiball will chime in on this thread. He probably has the kit to fix your jack and is one of the nicest guys on here to help out with a jack problem (Elroy is another one that might chime in on this thread also...).

 

[wookie]

Yes, on BITOG site I am bigsteve. Thanks for the welcome!

 

[Hiball]

Sorry about not seeing this post earlier, Is it leaking from the pump Piston or the Ram end? Does it hold up a load? Im guessing a rebuild kit is in order for you if it has any age on it. They are quality jacks and per my supplier the kits are fairly reasonable. My guy is on vacation till after the holidays (must be nice) but i can fix you up.

 

[wookie]

If I jack it up and stand on it (I'm about 250lbs) the jack holds and it is leaking fom the area I think your calling the ram end (Big piston side). The person I got the jackfrom is checking to see if his father in law has the rebuild kit for it also. Is this jack one that can be rebuilt with any special tools?

 

[GeorgiaHybrid]

Can you post some pictures of the jack from different angles and with the arm in the up and down position?

 

[wookie]

I'll take some pictures tomorrow after work and post them.

 

[WinFred]

2 ton or 4 ton jack???

http://blackhawkparts.com/store/page10.html

 

[Hiball]

2 ton or 4 ton jack???

http://blackhawkparts.com/store/page10.html

Its a 4 ton, silly blackhawkparts prices...

Its a fairly easy jack to rebuild with common hand tools, you will need a vise and some wrenches. Being that its leaking around the Ram end and it wont hold a load im guessing its bypassing on the main Ram and the Oring on the end can contain all the oil, therefore its leaking out. You can go to milwaukees website and download the pdf for your jack, It will give you a idea of how things come apart etc.

 

[wookie]

Should I check the piston for any burs or anything like that?

 

[Hiball]

I doubt you will find any burs unless something went seriously wrong and you got Metat to metal contact. I would be more interested in the condition of both pump pistons and the ram piston for excess pitting etc.

 

[wookie]

From what I can see this jack has no pitting just has not been used in decades but stored in doors.

 

[T VETTE]

Would like to tag on to this if possible. Welcome wookie...........

I have a jack made in Japan I bought around 1977 and is a 2 1/2 ton called a fleetwood. Started leaking a few months ago and thought it was time to recycle it. Your thoughts Hiball on rebuild or move on. I can post pic later today. No pits on ram at all, now low on oil and won't go up. Always stored inside and no rust.

 

[GeorgiaHybrid]

I think the "pitting" that Hiball is talking about is on the inside of the cylinder and the piston. You need to disassemble the jack to see the problem.

 

[Hiball]

I think the "pitting" that Hiball is talking about is on the inside of the cylinder and the piston. You need to disassemble the jack to see the problem.

Actually, Inside pitting doesnt occur very often unless it has been left outside in the elements and the inside is completely dry of oil. It doesnt take much of a oil film to prevent inside damage. The Pitting i was referring to is on the outside sealing surfaces of the Pumps and Ram. Even then a little is ok as long as all sharp edges are cleaned up.

Would like to tag on to this if possible. Welcome wookie...........

I have a jack made in Japan I bought around 1977 and is a 2 1/2 ton called a fleetwood. Started leaking a few months ago and thought it was time to recycle it. Your thoughts Hiball on rebuild or move on. I can post pic later today. No pits on ram at all, now low on oil and won't go up. Always stored inside and no rust.

Ive said it many times the older overseas stuff is much better than what you can buy today. There easy to work on, Parts can be found at most hydraulic shops etc. Basically your faced with the option of fixing your current jack or investing in the another overseas jack that might not be as good as the one you currently have.

 

[wookie]

Any brand of hydraulic oil I should use or stay away from?

 

[Hiball]

Any brand of hydraulic oil I should use or stay away from?

Most of them are the same and all carry the anti foaming, rust inhibitor etc....

 

[wookie]

The PO had a new Milwaukee rebuild kit with instructions and gave it to me at no cost. When I disassemble the hudraliic unit to rebuild it do I need to clean it with anything other then hyd fluid? Also should I replece the parts that came in the kit?

 

[Hiball]

The PO had a new Milwaukee rebuild kit with instructions and gave it to me at no cost. When I disassemble the hudraliic unit to rebuild it do I need to clean it with anything other then hyd fluid? Also should I replece the parts that came in the kit?

You can use any kind of degreaser if needed, I like to completely clean my parts inside and out. If you have the kit i would replace everthing in there for good measure including the hard parts balls, springs etc.

 

[wookie]

Would Mineral spirits or Brake parts cleaner in the spray can be one of the cleaners? Also should the seals be lubed with hydraulic fluid before instalation?

 

[wookie]

I took the jack apart today and there was no rust/corrosion problem at all on the ram. The yellow O ring on the ram was hard a brittle and fell apart when I removed it. The original back up washers were made of a felt like material and the replacements were made of rubber. This kit is OEM Milwaukee, are the newer rubber backup rings better then the old style felt ones?
Also are the first 2 numbers in the jack part number the year it was built?

 

[wookie]

If a floor jack doesnt lower smooth does it tell me there is air in the system?

 

[CadiMan]

Hello to all,

Just purchased a used Milwaukee model 40. When I tried it out, I noticed that it will not lift to the advertised height of 24"(it will stop consistently at 19.5 inches). Usually, this indicates low fluid however, I have attempted to fill it 3 times per the maintenance instructions (the last time drop by drop) and it will not accept any more fluid, am I doing some thing wrong, or did I just buy a haunted jack?

Sincerely, CadiMan