Hydraulic Rod Buffer Seal, 85 x 100.5 x 6.3mm, PTFE (3.346" x 3.957" x 0.248") - Replacement Cylinder Seal

FINAL SALE - NO RETURNS. THIS IS A STANDARD CATALOGUE SIZE; CONFIRM YOUR DIMENSIONS AND MATERIAL BEFORE ORDERING.

Because standard sizes are chosen by measurement rather than by machine model, they ship as final sale. If we send the wrong item, or it arrives damaged or defective, we replace it free of charge, and that never changes.

Is a hydraulic cylinder drifting down, leaking at the rod, or losing force? Worn rod and piston seals are the usual cause, and replacing them restores holding power without buying a new cylinder.

This Beaver Island Parts Company part is a hydraulic cylinder seal that holds pressure between the rod or piston and the cylinder wall, measuring 85 x 100.5 x 6.3mm (3.346" x 3.957" x 0.248"), made with PTFE.

Specifications

What It Fits

Used in hydraulic cylinders on loaders, excavators, tractors, log splitters, dump bodies, presses, lifts and industrial machinery. If your parts list or the old seal reads 85 x 100.5 x 6.3mm, this is the size.

Design and Material

PTFE is chemically inert and will not swell, harden or degrade in fluids that attack rubber.

You Can Do This Repair

Disassemble the cylinder, clean every groove, and inspect the rod and bore for scoring. Warm polyurethane seals in hot water so they flex, use a blunt pick (never a screwdriver) to seat them, and orient U-cup lips toward the pressure. Lubricate with clean hydraulic oil before reassembly.

Pro Tip: Replace the wiper, rod seal and piston seal together. A new seal next to an old one will usually be the next leak.

Shipping: This part is special-ordered and packed for you. It ships from our facility in about 10 business days, then transits by the carrier service you choose at checkout. The estimated delivery date shown on this page includes that lead time.

Why Buy From Beaver Island Parts Company

• Every dimension published. Size, material, hardness and temperature rating are listed up front so you can confirm fit before you buy, not after.
• Inspected, packed and labeled by us. Each order is checked and repacked in a bag labeled with the part's size and material, so it never gets lost in a parts bin.
• Real people who answer fitment questions. We are an American family-owned and operated small business. Send us your measurements or model number and we will help you confirm the right part.
• Replacement guarantee. If we ship the wrong item, or it arrives damaged or defective, we replace it free of charge.

Frequently Asked Questions

Q: How do I know this is the right size?
A: Seals are sized by measurement: inside diameter, outside diameter and height. Measure the shaft and bore, not just the old seal, which may be worn or distorted. This part measures 85 x 100.5 x 6.3mm.

Q: Can I do this repair myself?
A: Yes, with basic hand tools and patience. Clean everything, work without sharp tools near the sealing lips, lubricate before assembly, and press seals in square. The installation notes above walk through the key steps.

Q: When will it ship?
A: It ships from our facility in about 10 business days, then transits by the carrier service you choose.