O-Ring 0.139IN Thick X 5.734IN ID -256 Cl 5 75 Duro

Enhance your heavy equipment’s performance with the Case Construction O-Ring. Measuring 0.139 inches thick and 5.734 inches in ID, this durable #86012300 O-Ring ensures a reliable seal for optimal operation in demanding environments. Perfect for maintaining efficiency!

Compatible equipment

This part fits CASE LONG TRACK/TURNABLE LEVELER CRAWLER EXCAVATOR, DROTT CRAWLER EXCAVATOR, CASE CRAWLER EXCAVATOR (NORTH AMERICA), CASE CRAWLER TRACTOR, TRENCHER SUPPLEMENT (NORTH AMERICAN HOMOLOGATION), CASE CONSTRUCTION KING LOADER BACKHOE AFTER S/N 3739160 (EUROPE), CASE CONSTRUCTION KING LOADER BACKHOE BEFORE S/N 3739160 (EUROPE), CASE CONSTRUCTION KING LOADER BACKHOE, CASE WHEEL LOADER (PRIOR TO S/N JAK0021701) (NORTH AMERICA), CASE WHEEL LOADER (S/N JAK0021701 & AFTER) (NORTH AMERICA), CASE WHEEL LOADER (NORTH AMERICA), CASE TRENCHER, CASE EXCAVATOR - TILTING TOOL ATTACHMENT W/QUICK COUPLER, CASE/POCLAIN CRAWLER EXCAVATOR (S/N 9501 & AFTER), CASE WHEEL LOADER (S/N 8208732 TO 9808999), CASE WHEEL LOADER (S/N 9809000 TO 9811800), CASE WHEEL LOADER (S/N 9811801 & AFTER), CASE WHEEL LOADER (S/N 17754000 & AFTER), CASE WHEEL LOADER, CASE WHEEL LOADER (S/N 9811301 & AFTER) (NORTH AMERICA) including models 1088, 120, 125B, 1550, 560, 580F, 580G, 621, 621B, 660, 821, 888B, 90BCL, W10B, W10C, W10E, W36, W7, W7E, W8B, W8C, W8E, W9B, W9C, W9E.

Frequently asked questions

What is the part number?

The manufacturer part number is 86012300.

Is this a genuine OEM part?

Yes. Southeastern Equipment stocks OEM and quality aftermarket parts for heavy equipment. Contact us if you need a specific OEM source or aftermarket option.

Will this fit my machine?

See the compatible equipment list above. If your model is not listed, call us with your machine's serial number and we can confirm.

Where does this ship from?

Southeastern Equipment Company ships parts nationwide from our US warehouse. Orders placed before 2 PM ET typically ship same day.

Ships nationwide. In-stock parts ordered before 2:30 PM ET ship the same business day. Your exact shipping cost and delivery estimate are calculated at checkout from your ZIP code and the part’s size and weight; oversized and truck-freight items may need extra transit time and freight charges.

Free branch pickup is also available across Ohio, Indiana, Michigan, and Kentucky — just choose it at checkout.

30-day returns. New, unused parts in original packaging may be returned within 30 days. Some items — including electrical, special-order, and direct-from-supplier parts — are non-returnable. See our full return policy.