RING, PISTON

046 991 98 RING, PISTON is what keeps the pressure where it needs to be inside a hydraulic cylinder or a rock drill's percussion unit. It's not just a spacer; it actually forms a critical seal against the cylinder wall, making sure that when oil or air pushes on the piston, that force gets translated directly into movement or impact, not just leaking past. Think of it as the crucial barrier that prevents internal bypass, ensuring your system actually does the work it's supposed to.

When these rings start to wear out, you'll definitely notice it in the rig's performance. Usually, what happens is you lose efficiency. On a rock drill, that means inconsistent impact, or it might just feel sluggish, like it's not hitting as hard as it should. In a hydraulic cylinder, you might start seeing cylinder drift, where it slowly extends or retracts on its own, even when the control valve is in neutral. Sometimes, you'll even hear a slight hiss if it's an air-over-oil system, indicating internal leakage. The system just can't hold its pressure like it used to.

Replacing these isn't rocket science, but it's critical to get it right for long-term reliability. Always make sure the cylinder bore is clean and free of any scoring or damage before you even think about putting a new ring in. And don't forget to check the piston groove itself for wear too; a worn groove will chew up a new ring in no time, making all your effort pointless. A little bit of clean hydraulic oil or assembly lube on the ring before installation helps prevent damage on initial startup.