Description
When hydraulic cylinders start weeping, fuel systems develop drips, or your cooling system won’t hold pressure, the culprit is often a worn-out O-ring. These simple rubber rings keep fluids where they belong and prevent contamination that ruins expensive components. This 4-5/8 inch ID size fits larger hydraulic fittings and system components found on mid-size to heavy agricultural equipment.
What You’re Getting
- 70 durometer Buna-N rubber that handles hydraulic fluid, fuel, and oil without swelling
- Precise 4-5/8 inch inside diameter and 1/8 inch cross-section for proper fit in grooves
- Temperature resistance from -40°F to 250°F covers your operating range
- 10-pack quantity keeps spares on hand for field repairs and maintenance
- Chemical resistance to agricultural fluids, lubricants, and common solvents
Built for Real Farm Work
This size O-ring shows up in hydraulic systems on larger tractors, combines, and implements where substantial sealing is needed. You’ll find them in loader valve assemblies, three-point lift cylinders, transmission cooler connections, and heavy hydraulic fittings. Whether you’re running a 100-horsepower row crop tractor or a big self-propelled sprayer, these rings handle the pressure and vibration that comes with serious farm work.
Made to Last
Buna-N rubber resists the petroleum products and hydraulic fluids your equipment uses daily. The 70 durometer rating provides the right balance of flexibility to seal properly while staying firm enough to resist extrusion under pressure. These rings maintain their shape through thousands of pressure cycles and temperature swings from winter storage to summer fieldwork.
Good to Know
Always replace O-rings when disassembling hydraulic connections – even if the old one looks okay, rubber hardens with age and won’t seal like new. Clean the groove thoroughly and check for nicks or scratches that could cut the new ring. A light coat of hydraulic fluid on the O-ring makes installation easier and prevents damage during assembly. Keep the extras dry and away from solvents until needed.
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