Put the spring and plug back where it belongs.
Look along the cylinder part of the floor jack and you will see a rubber
plug that will appear like a small dome about the size of a dime.  Pry this
out with a screwdriver and fill with jack fluid.

Ivan Vegvary

Sounds like when the spring came out, it drag the plastic piece out. I
would just install them in either way and see which would do the lifting.
Fill the other fill hole but filling tends to go fast with the check valve
removed. Spread the lift (jaws are too vague) all the way and keep it
spread with a rod. Analogous to a person manually opening an alligator's
jaw.

Rick

Hey Rick,

I tried using the jack today but it would not lift my truck anymore. so I
tightened the nut that holds the check valve. Opened the jaws and filled
with fluid.

Then It just stood there. So I put my foot on the jack and pressed down. The
little oil cover popped out somewhere and oil gushed everywhere.

Any ideas on how to fix this?

Does the check valve cover need to go all the way down?

I went to the auotoparts store ( pep boys ) and they don't carry any parts.
Any Idea where I can get a replacement?

Thx