Nut Spring

Enhance your heavy equipment performance with the Case Construction Nut Spring #131-637. Designed for durability and precision, this essential part 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 CONSTRUCTION KING LOADER BACKHOE, CASE CONSTRUCTION KING LOADER BACKHOE AFTER S/N 3739160 (EUROPE), CASE CONSTRUCTION KING LOADER BACKHOE BEFORE S/N 3739160 (EUROPE), LOADER BACKHOE (NORTH AMERICA), LOADER BACKHOE (NORTH AMERICA) (ASN JJG0020000), CASE SUPER-K CONSTRUCTION KING LOADER BACKHOE, TURBO LOADER BACKHOE, CASE TURBO HORIZONTAL DIRECTIONAL DRILLING MACHINE, 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 WHEEL LOADER (S/N JEE0155000 & BEFORE) including models 480C, 480D, 480LL, 580C, 580F, 580G, 580K, 580SK, 590, 6010, 621, 621B, 621C, 680K, 680L, 721, 721B, 721C, 780C, 780D, 821, 821B, 821C, 921, 921B.

Frequently asked questions

What is the part number?

The manufacturer part number is 131-637.

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.