Check the Hydraulic Fluid Level
When operating a jack with a higher fluid level than normal, the higher than recommended pressure risk blowing out seals, causing internal leaks and resulting in a jack that won’t hold pressure.
Why won’t my floor jack go all the way up?
If the jack does not lift the load or begins to lower after it’s lifted, check the tightness of the release valve. If the tightness of the handle and release valve is correct and then the jack still performs the same way, either a hydraulic malfunction has taken place on the jack or you’re overloading the jack.
Why do hydraulic jacks fail?
Unable to Lift Weight: When a hydraulic jack fails to lift the load, it means that the ram is not working properly. The common reasons for difficulty in lifting the load are overloading, trapped air, lack of lubrication, rust, and high/low oil level.
How do you fix a jack that won’t go down?
You need to bleed or purge the air from the jack, which isn’t difficult once you know how.
Rotate, or spin, handle to the right until it stops.Pump the jack 10-15 times to release trapped air.Turn the handle all the way to the right to close the relief valve. Afterward, jack functionality should be back to normal.
What can be used instead of hydraulic fluid?
“It is a common practice in the construction and mining industries to use engine oil SAE 10, SAE 20 or SAE 30 with the lowest API rating as a substitute for hydraulic oil ISO 32, ISO 46 or ISO 68, respectively for hydraulic systems of heavy equipment.
