[AT] Hydraulic bottle jack issues

[Steve W.]

David Trompower wrote:
> need your thoughts and help with this. My  old Black jack  brand,
> hydraulic (bottle) hand jack, 12 ton model,   will  raise the ram,
> but not retract the ram.
> 
> 1) Opening the release valve does nothing. 2)  the weight of what I
> have raised with the jack  will not  push the ram back down? 3)  I
> can stand on it  and it will not retrack. 4)  if I hit  the ram  with
> a mallet it will slowly go down, .. an 1/8 of an inch  with each blow
> is all. 5)  Left over night with a load on the ram,  will not cause
> the ram to be retracted by morning. 6)  I opened the filler port
> expecting there is too much oil or excess trapped air.  but neither
> came out?
> 
> What is wrong? What  would you  recommend I do to fix this jack? I am
> stumped.
> 
> 
> R. David
> 
> 

Sounds like the release valve ball is stuck or the passage is blocked. I 
would take it apart and refurbish it.

-- 
Steve W.