Why won't the jack lower?

1 Answers
EmilioFitz
07/30/25 5:54am
When a jack won't lower, it's usually due to a stuck check valve, which requires maintenance or replacement. Additional information about jacks: 1. Jack: A compact lifting device that uses rigid lifting components as working mechanisms to raise heavy objects through small movements of either the top support seat or bottom support claws. Jacks are primarily used in factories, mines, transportation sectors for vehicle repairs and other lifting/support tasks. They feature lightweight yet sturdy construction, flexible operation, and can be carried and operated by a single person. 2. Principle: Hydraulic jacks operate on Pascal's Law - equal pressure throughout a confined liquid. In a balanced system, applying small pressure to a smaller piston creates proportionally greater pressure on a larger piston, maintaining liquid equilibrium.
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