Union

Introducing Case Construction Union #504387878, a robust and reliable part designed for heavy equipment performance. Engineered for durability and efficiency, this component ensures optimal functionality, making it an essential choice for construction professionals seeking quality and reliability in their machinery.

Compatible equipment

This part fits COMPACT WHEEL LOADER STD TC - TIER 4, COMPACT WHEEL LOADER STD ZB - TIER 4, COMPACT WHEEL LOADER HS ZB - TIER 4, LOADER LANDSCAPER - TIER 4A ASN NCC570600, BACKHOE LOADER - TIER 4A - FROM PIN NCC560000, BACKHOE LOADER - TIER 4A - FROM PIN NCC564000, BACKHOE LOADER WIDE TRACK - TIER 4A, FORKLIFT - TIER 4A, BACKHOE LOADER - TIER 4A, ENGINE - 5801390423 - 84281067, ENGINE PN 5801473755 - 85KW, ENGINE 5801398328 - 84281129., ENGINE 5801438206 - 84393712., ENGINE PN 5801473756 - 67KW, ENGINE - 5801473761 - 84327790, ENGINE PN 5801473757 - 61KW, ENGINE - 5801842715 - 47651438 - TIER 4A, ENGINE 5801842709 - 47651435 - TIER 4A, ENGINE 5801842710 - 47651437 - TIER 4A, SKID STEER LOADER - TIER 4A, SKID STEER LOADER TIER 4, COMPACT TRACK LOADER - TIER 4A including models 121F, 21F, 221F, 321F, 570NXT, 580N, 580SN, 580SN WT, 586H, 588H, 590SN, F5HFL413A A001, F5HFL413A A002, F5HFL413B A001, F5HFL413B A002, F5HFL413E A001, F5HFL413G A001, F5HFL413H A001, F5HFL463A F006, F5HFL463B F002, F5HFL463C F002, SR250, SV250, TR320, TV380.

Frequently asked questions

What is the part number?

The manufacturer part number is 504387878.

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.