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CA
High-quality piston seal
In wheel loaders, compact tractors, skid steers, and excavators, a worn piston seal often shows up as slow cylinder drift, weak breakout force, overheating fluid, or “no external leak” power loss from internal bypass. Once a hydraulic piston seal loses lip tension or gets nicked by contamination, pressure bleeds across the piston, and your cylinder piston seal can’t hold load.
For that FridayParts focus on correct bore fit, profile type (U-cup/T-seal styles vary by cylinder), material (commonly NBR/PU/PTFE blends), and extrusion control for high pressure. And we offer high-quality parts at affordable prices—so you can rebuild instead of replacing the whole cylinder.
Quick Symptom Guide
This page includes piston seal kits for Yanmar, New Holland, John Deere diff-lock, Liebherr, and Caterpillar.
| Symptom | Common cause | Fix |
| Cylinder drifts | internal bypass | Replace piston seals |
| Slow/weak hydraulics | Worn seal + heat | Install the piston seal kit |
Send me your machine model and cylinder location (arm/bucket/drive). We’ll confirm the right piston seal or other seal kit fast so you can restore pressure, stop drift, and get back to work.