Yes, that's correct, I took it all apart again and through trial and logic figured out that the pressure release valve must have a spring. All working as should. Thank you for your reply.
Looked on various websites and have found nothing...I've looked on YouTube and found a similar jack, Shinn Fu.
The 3holes shown on the photo are numbered as I believe the parts should be fitted, the YouTube video shows the non return valve as number 2.
I've put the jack together in this way and...
Hi, I have an old blue and white floor jack, I believe it's an old sears model.
I recently decided to rebuild it as it wasn't holding pressure and it was leaking.
Anyway after changing the main piston seal I stupidly turned the jack upside down and managed to empty the two chambers on the main...