When to Replace and When to Repair a Hydraulic Hose
https://fluidpowerjournal.silverstonebrief.com/posts/when-to-replace-and-when-to-repair-a-hydraulic-hose
You'll want to replace a hydraulic hose when you see bulges, cuts, or leaks, or if it's flattened or stiff from age or chemical damage. But if it's just a loose fitting or a minor surface abrasion, repairing it by tightening the connection or adding a sleeve can save you money and hassle. Always check manufacturer guidelines for pressure ratings and compatibility before deciding.