Diaphragm

Enhance your heavy equipment performance with the Case Construction Diaphragm #N9521. Designed for durability and precision, this essential part ensures optimal functionality in your machinery, keeping your operations running smoothly and efficiently. Perfect for demanding construction environments.

Compatible equipment

This part fits CASE SERIES-C CONSTRUCTION KING LOADER BACKHOE (S/N 9111009 & AFTER), CASE CONSTRUCTION KING LOADER BACKHOE, CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER) (NORTH AMERICA), CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER), CASE WHEEL LOADER (S/N 9123140 & AFTER) (NORTH AMERICA), CASE WHEEL LOADER (NORTH AMERICA), CASE WHEEL LOADER including models 680CK, 680E, 680G, 680H, 680K, 780B, 780C, W14, W14FL, W14H, W18, W20, W20B, W20C, W24C.

Frequently asked questions

What is the part number?

The manufacturer part number is N9521.

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.