O-Ring Seal

Ensure optimal performance of your Case Construction equipment with the O-Ring Seal #J678603. Designed for durability and precision, this essential part prevents leaks and maintains hydraulic integrity, keeping your machinery running smoothly on the job site.

Compatible equipment

This part fits CRAWLER DOZER TIER 2, CASE IH AXIAL-FLOW COMBINE (NA), CASE IH AXIAL-FLOW COMBINE (NA) BTW HAJ292001&HAJ300000, CASE IH AXIAL-FLOW COMBINE (NA) BSN JJC0276540, CASE IH AXIAL-FLOW COMBINE (NA) BTW HAJ292001 & HAJ300000, CASE IH AXIAL-FLOW COMBINE (RU) ASN HAJ300001, AXIAL-FLOW COMBINE (NA) ASN HAJ0300001, CASE IH AXIAL-FLOW COMBINE (NA) ASN HAJ300001, PATRIOT SPRAYER, CASE IH COTTON EXPRESS COTTON PICKER, COTTON EXPRESS COTTON PICKER, AXIAL-FLOW COMBINE (NA), SERIES 2 LOADER BACKHOE - ASN JJG0239360, LOADER BACKHOE (NORTH AMERICA), MODULE EXPRESS COTTON PICKER, 8304 275HP - ENGINE, 8304 305HP - ENGINE, 9004 350HP - ENGINE, CASE WHEEL LOADER (S/N JEE0155000 & BEFORE), CASE WHEEL LOADER (S/N JEE0155001 & AFTER), CASE IH COTTON PICKER, COMBINE, COMBINE ENGINE - 9L PRIOR TO PIN HAJ111001, CASE STANDARD CRAWLER EXCAVATOR (NORTH AMERICA), CASE LONG REACH CRAWLER EXCAVATOR (NORTH AMERICA), CASE CRAWLER EXCAVATOR (NORTH AMERICA), FLOATER, FLOATER - 1999, FLOATER - 2002, WHEEL LOADER, TRACTOR (NA), TRACTOR (EMERGING MARKET), CASE IH MAGNUM TRACTOR (NORTH AMERICA), CASE IH MAGNUM TRACTOR NA, CASE IH MAGNUM TRACTOR (P.I.N. JJA0105000 & AFTER), CASE IH MAGNUM TRACTOR (PRIOR TO P.I.N. JJA0105000), IRRIGATION POWER UNIT, SPRAYER, 4WD TRACTOR (ASN Z6F105001) (NA), 4WD TRACTOR, CASE IH 4WD TRACTOR, CASE IH 4WD TRACTOR (BTW Z6F100023 - Z6F105001), TRACTOR, 4WD TRACTOR ASN, TRACTOR (NORTH AMERICA) including models 1850K TIER 2, 2366, 2377, 2388, 2577, 2588, 3185, 420, 420 TIER 3, 4420, 5088, 580SL, 580SM, 590SM, 6088, 620, 625, 6TAA, 7088, 821C, CPX420, CPX610, CPX620, CR9040, CR9060.

Frequently asked questions

What is the part number?

The manufacturer part number is J678603.

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.