Had a similar problem with a 20 plus year old triolley jack just recently. I
took the whole lot apart using an adjustable wrench and a vice - its no big
deal, no special tools, gave it a thorough clean up with some turps and
meths - amazing the amount of crud in the bore that builds up over that time
period. I took the seal to the local auto repair shop (REPCO in Aus) and
they had a seal off the shelf. The old seal had a definite flat spot on the
bottom of it where the muck in the bore had been. I replaced the oil using
some nice thick engine oil and its been working fine since.
I repaired three jacks about 20 years ago, I found them VERY hard to
take apart, I ended up at a jack repair place and had them break the
threaded joint with their tools ( a LARGE vice and a 10-foot cheater
on a special wrench), I had bought the repair kits from them and they
were very good-natured about my chagrin from being unable to
dissassemble the jack with my Sears vice and 18" pipe wrench.
Having just done a trolley jack the other day, they are pretty easy.
You will need to pull the jack out of the frame - mine had 6 allen
screws holding it in.
There is a BIG nut on the top of the ram shroud. in my case the ram
shroud was a piece of pipe which also threaded into the main body.
Remove both the nut and the pipe - you will need a big spanner, a
solid vice and a Stilson and rags to clean up spilt oil ;-)
Go to local seal and bearing emporium and for $NZ10.58 (~$US6.60)
they can match you up another one. Take the ram so they can check the
size. New Zealanders can go to Seal House, East Tamaki. You may need
to buy a bit of jack oil as well, although I have head of people using
ATF or hydraulic oil.
"assembly is the reverse of the previous section"
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