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Generally speaking, if your jacks are hydraulic, and are not acting properly, lubrication per se is not what is required.
A: check for hydraulic fluid (thin but oily) leakage.
B: What exact model is this? and is it in a stand, or add-on which has the jacks?
Lubrication in the sense of oiling or greasing is not likely to be required. Unless what you call 'jacks' are something else.