O-ring

Enhance the performance of your Case Construction equipment with the durable O-Ring #86977781. Designed for optimal sealing and reliability, this essential part ensures efficient operation, reducing downtime and maintenance costs in heavy-duty applications.

Compatible equipment

This part fits CASE CRAWLER EXCAVATOR, CASE CRUZ-AIR WHEELED EXCAVATOR, CASE TORQUE CONVERTER CRAWLER TRACTOR (BEFORE S/N 7109000), CASE TORQUE CONVERTER CRAWLER TRACTOR (S/N 7109000 TO 7110299), CASE TORQUE CONVERTER CRAWLER TRACTOR (S/N 7110300 & AFTER), CASE CRAWLER TRACTOR, CASE UNI-LOADER SKID STEER LOADER, CASE UNI-LOADER SKID STEER LOADER (NORTH AMERICA), BACKHOE, CASE GAS & DIESEL WHEEL TRACTOR, CASE WHEEL TRACTOR, CASE TRENCHER, DROTT SERIES-E CRAWLER EXCAVATOR (S/N 6271140 & AFTER), DROTT SERIES-B FELLER/BUNCHER CRAWLER EXCAVATOR, DROTT SERIES-A CRAWLER EXCAVATOR, DROTT SERIES-B CRAWLER EXCAVATOR, CASE SKID STEER LOADER, CASE CRAWLER TRACTOR (S/N 3012301 & AFTER), SKID STEER BSN 430 NA N7M479683 430 EU N7M479546, CASE CONSTRUCTION KING WHEEL TRACTOR, CASE CRAWLER TRACTOR (PRIOR TO S/N 3038436), CASE CRAWLER TRACTOR (S/N 3038436 TO 3060306), CASE CONSTRUCTION KING LOADER BACKHOE, CASE SERIES-E CRAWLER EXCAVATOR (S/N 6280543 & AFTER), WHEEL LOADER - TIER 4B (NA), CASE LONG TRACK CRAWLER TRACTOR, IND - CASE CRAWLER TRACTOR, LOADER LANDSCAPER, SERIES 3 LOADER LANDSCAPER TIER 3 - ASN N8C510600, LOADER LANDSCAPER - LIVERY - TIER 4B, LOADER LANDSCAPER - TIER 4B, LOADER LANDSCAPER - TIER 4A ASN NCC570600, CASE CONSTRUCTION KING FORKLIFT, CASE CONSTRUCTION KING TRACTOR (BSN 8685800) (NORTH AMERICA), CASE CONSTRUCTION KING TRACTOR W/SHUTTLE TRANSMISSION, LOADER BACKHOE (NORTH AMERICA), LOADER BACKHOE (NORTH AMERICA) (ASN JJG0020000), SERIES 2 LOADER BACKHOE - ASN JJG0239360, LOADER BACKHOE (NA) - ASN JJG0285001, SERIES 2 LOADER BACKHOE TIER 2 (NA) - ASN N4C303000, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N8C500000, BACKHOE LOADER (LIVERY) - TIER 3 NRC, BACKHOE LOADER (LIVERY) - TIER 4B, BACKHOE LOADER - TIER 3 NRC, BACKHOE LOADER - TIER 4A - FROM PIN NCC560000, BACKHOE LOADER - TIER 4B, BACKHOE LOADER 2WD - TIER 3 NRC - MY18, BACKHOE LOADER 2WD - TIER 3 NRC - MY19, BACKHOE LOADER 2WD - TIER 4B - MY18, BACKHOE LOADER 2WD - TIER 4B - MY19, BACKHOE LOADER 4WD - TIER 3 NRC - MY18, BACKHOE LOADER 4WD - TIER 3 NRC - MY19, BACKHOE LOADER 4WD - TIER 4B - MY18, BACKHOE LOADER 4WD - TIER 4B - MY19, LOADER BACKHOE (TIER 3), LOADER BACKHOE - TIER 3 NRC, CASE SUPER-K CONSTRUCTION KING LOADER BACKHOE, LOADER BACKHOE - BSN JJG0239361, SERIES 2 LOADER BACKHOE TIER 2 (NA) - ASN N4C304000, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N8C5040000, SERIES 2 LOADER BACKHOE TIER 2 (NA) - ASN N4C307000, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N8C508000, BACKHOE LOADER - TIER 4A - FROM PIN NCC564000, LOADER BACKHOE - TIER 3, BACKHOE LOADER (LIVERY) - WIDE TRACK - TIER 3 NRC, BACKHOE LOADER (LIVERY) - WIDE TRACK - TIER 4B, BACKHOE LOADER - WIDE TRACK - TIER 4B, BACKHOE LOADER 4WD - WIDE TRACK - TIER 3 NRC - MY18, BACKHOE LOADER 4WD - WIDE TRACK - TIER 3 NRC - MY19, BACKHOE LOADER 4WD - WIDE TRACK - TIER 4B - MY18, BACKHOE LOADER 4WD - WIDE TRACK - TIER 4B - MY19, BACKHOE LOADER WIDE TRACK - TIER 3, BACKHOE LOADER WIDE TRACK - TIER 3 NRC, BACKHOE LOADER WIDE TRACK - TIER 4A, CASE FORKLIFT, SERIES 3 FORKLIFT TIER 3 - ASN N8C510000 (NA), FORKLIFT - LIVERY - TIER 4B, FORKLIFT - TIER 4A, FORKLIFT - TIER 4B, TURBO LOADER BACKHOE, LOADER BACKHOE, SERIES 2 LOADER BACKHOE - ASN JJG0210575, SERIES 2 LOADER BACKHOE TIER 2 (NA) - ASN N4C309000, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N8C508500, SERIES 3 LOADER BACKHOE TIER 3 (NA) - ASN N7C431854, BACKHOE LOADER - TIER 4A, 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 WHEEL LOADER, WHEEL LOADER TIER 3 (NA), WHEEL LOADER - TIER 4 (NA), WHEEL LOADER - TIER 4 / TIER 2 (NA), CASE SKID STEER LOADER - ASN JAF0318922 (NA) JAF0352169 (EU), CASE SKID STEER LOADER - ASN JAF0352234 (NA) JAF0352715 (EU), CASE SKID STEER LOADER - ASN JAF0320050 (NA) JAF0274262 (EU), CASE SKID STEER LOADER - ASN JAF0311357 (NA) JAF0274360 (EU), CASE BACKHOE, DAVIS FLEETLINE 30 4 TRENCHER, DAVIS FLEETLINE 40 4 TRENCHER, SKID STEER LOADER, TRACTOR - TIER 4A (NA) - S/N ZXXT5XXXX, COMPACT TRACK LOADER, CASE UNIT LOADER including models 1080, 1085B, 1085C, 1086B, 1150, 1280, 1280B, 1450, 1840, 1845C, 31, 320, 320B, 360, 40, 40BLC, 40EC, 40XT, 40YC, 420B, 420BD, 420C, 430, 430CK, 450.

Frequently asked questions

What is the part number?

The manufacturer part number is 86977781.

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.

Free pickup at any of our 17 branches across Ohio, Indiana, Michigan, and Kentucky. Select your preferred branch at checkout.

30-day no-fault returns. Bought the wrong part? Send it back for a full refund — no restocking fees, no minimums.