Hydraulic jacks are rugged tools that can lift cars, trucks and even houses. There are a couple of things that can go wrong that will cause the jack to fail and that the average do-it-yourselfer can fix on their own at home.
One issue that can occur is air getting mixed into the hydraulic oil. A second issue could crop up when you have an internal or external oil leak. Both of these issues will prevent a necessary pressure buildup that the hydraulic system requires to lift items up.
Removing the air from the hydraulic system is fairly easy. All you have to do is refill the reservoir with hydraulic jack oil. Do not use motor oil, brake or transmission fluids in the reservoir. These types of oils can harm the internal parts of the cylinder, with a few exceptions. You should check the manufacturer’s specifications if you are unsure about what type of oil to use.
Find and open the oil filler port and pour fluid into the jack. You need to make sure you only open the port filler and not the cap for the overload valve. The overload valve is a safety feature, and it stops the jack from exceeding its PSI limit. Once the oil cap is off, pump the jack handle a couple of times to push the air out, and then fill the reservoir with new oil.
Fixing a leak often requires taking apart the cylinder to get at the internal parts. These parts include
You don’t have to search all over for parts for hydraulic jacks. Sears PartsDirect has all the parts you need for Companion, Craftsman and Test Rite hydraulic jacks. At Sears PartsDirect, we care about you and can answer any questions you have on how to fix your hydraulic jack.