Relay

Enhance your heavy equipment performance with the Case Construction Relay #120398A1. Designed for durability and reliability, this essential component ensures optimal functionality in your machinery, keeping your operations running smoothly and efficiently. Perfect for Case equipment maintenance and repairs.

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 LOGGER CRAWLER EXCAVATOR, CASE FELLER/BUNCHER CRAWLER EXCAVATOR, CASE TRACTION KING TRACTOR (AFTER S/N 9806101), CASE TRACTION KING TRACTOR (BEFORE S/N 9806101), CASE TRACTION KING DIESEL TRACTOR, CASE 4-CYL. DIESEL POWER UNIT, CASE DIESEL ENGINE & POWER UNIT (SIZE 111), CASE CABLE LAYER W/301B ENGINE (PRIOR TO S/N 3058169), CASE WHEEL LOADER (BEFORE S/N JEE0135500), CASE WHEEL LOADER (S/N JEE0135501 & AFTER) - ENGINE SUPPLEMENT, CASE WHEEL LOADER - NA (S/N JEE0135501 & AFTER), CASE SKID KING WHEEL LOADER, 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, CASE CONSTRUCTION KING LOADER BACKHOE, CASE CRAWLER TRACTOR (AFTER S/N 7070351), CASE WHEEL LOADER (S/N JEE0155000 & BEFORE), CASE WHEEL LOADER (S/N JEE0155001 & AFTER), MOTOR GRADER TIER 2- BTW 020101-020187, MOTOR GRADER TIER I (BR) - ASN N8AF07000, MOTOR GRADER - TIER 3 (NA) - ASN N7AF03356, MOTOR GRADER - TIER 3 (NA) - ASN N8AF03592, MOTOR GRADER - DIRECT DRIVE - TIER 3 (BR), MOTOR GRADER - TORQUE CONVERTER - TIER 3 (BR), MOTOR GRADER TIER 3 (NEW CAB), CASE CRAWLER TRACTOR (S/N 7073469 & AFTER) (NORTH AMERICA), CASE CRAWLER TRACTOR (UP TO S/N 7073468) (NORTH AMERICA), CASE LONG TRACK CRAWLER TRACTOR, MOTOR GRADER TIER 2 - ASN 022101, MOTOR GRADER TIER 3 (NA), MOTOR GRADER - ASN N5AF04007, MOTOR GRADER - TIER 3 (NA) - ASN N7AF04232 & N6AF04226, MOTOR GRADER TIER 3 (BR) - ASN N8AF04429, MOTOR GRADER TIER 3 (NA) - ASN N8AF04429, MOTOR GRADER TIER 0 - TIER 2 (BR) - ASN N8AF05114, MOTOR GRADER TIER 3 (BR) - ASN N8AF05110, MOTOR GRADER TIER 3 (NA) - ASN N7AF05055, MOTOR GRADER TIER 3 (NA) - ASN N8AF05110, CASE CRAWLER EXCAVATOR (S/N EAC0501122 & AFTER), EXCAVATOR - TIMBER KING SUPPLEMENT, CASE CRAWLER EXCAVATOR (S/N EAC0601026 & AFTER), CASE CRAWLER EXCAVATOR (NORTH AMERICA), CASE STANDARD CRAWLER EXCAVATOR (NORTH AMERICA), CASE LONG REACH CRAWLER EXCAVATOR (NORTH AMERICA), CASE NARROW EXCAVATOR (NORTH AMERICA) ~DAC0721850 & ASN DAC211851, MOTOR GRADER, MOTOR GRADER ASN N8AF06000, MOTOR GRADER TIER 1 - TIER 2 - ASN N8AF00626, VARIABLE POWER MOTOR GRADER, MOTOR GRADER - NEW CAB (BRAZIL), MOTOR GRADER TIER 0 - TIER 2 - ASN N8AF01475, MOTOR GRADER TIER 0 - TIER 2 - ASN N8AF02180, WHEEL LOADER, NH MOTOR GRADER TIER 2 (NA), MOTOR GRADER TIER 3 (NA) - ASN N8AF00625, NH MOTOR GRADER, VP MOTOR GRADER (NA), MOTOR GRADER TIER 2 (NA), MOTOR GRADER TIER 3 (NA) - ASN N8AF02139, WHEEL LOADER (REV 05/2005), QSB - MOTOR GRADER, CASE UNIT LOADER (PRIOR TO S/N 8229367), WHEEL LOADERS (NA), CASE UNIT LOADER, WHEEL LOADER (W130/W130TC) (NA), WHEEL LOADER TIER 3 (NA), WHEEL LOADERS, CASE ARTICULATED WHEEL LOADER (PRIOR TO S/N 9119672) (NORTH AMERICA), CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER) (NORTH AMERICA), CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER), CASE ARTICULATED WHEEL LOADER (PRIOR TO S/N 9119672), CASE WHEEL LOADER (S/N 9123140 & AFTER) (NORTH AMERICA), CASE WHEEL LOADER (PRIOR TO S/N 9123140), CASE ARTICULATED WHEEL LOADER, CASE ARTICULATED WHEEL LOADER (PRIOR TO S/N 9120696), CASE WHEEL LOADER (PRIOR TO S/N 17754000), CASE WHEEL LOADER (S/N 17754000 & AFTER) including models 1080, 1080B, 1085C, 1150, 1150B, 1150E, 1150G, 1155E, 1187B, 1187C, 1200, 1450, 1470, 1550, 301BD, 336BD, 336BDT, 451BD, 451BDT, 475, 504BD, 504BDT, 521D, 600, 621.

Frequently asked questions

What is the part number?

The manufacturer part number is 120398A1.

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.