Hydaulic Floor Jack Gradually comes down

[bcossa2001]

I have a Sears Hydraulic Floor jack--when I jack up the car the jack slowly comes down--there is no noise and no sign of any leaking fluid. Can someone tell me what's wrong and how to fix it??

I've had the jack about 4 years--never done anything to the oil and never had any leaks, etc.....

 

[Steve S]

It is leaking internally, probably at the control valve. If there is a seal kit available you would replace all the seals/parts in the kit.

 

[Eddie]

probably the main piston seal. As Steve said, see if a service kit is availiable.