Diaphragm
Braking System ·15 Fitments
| Machine | Model | Years |
|---|---|---|
| CASE SERIES-C CONSTRUCTION KING LOADER BACKHOE (S/N 9111009 & AFTER) | 680CK | 1968 – 1993 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 680E | 1974 – 1978 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 680G | 1978 – 1981 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 680H | 1980 – 1984 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 680K | 1984 – 1988 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 780B | 1981 – 1985 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 780C | 1981 – 1988 |
| CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER) (NORTH AMERICA) | W14 | 1975 – 1986 |
| CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER) | W14FL | 1975 – 1986 |
| CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER) | W14H | 1980 – 1986 |
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.
- Manufacturer part number
- N9521
- Internal SKU
- IC:N9521
- Brand
- CASE CONSTRUCTION
- Condition
- OEM, new
- Category
- Braking System
- Weight
- 0.32 lb
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.
All 15 fitments
| Machine | Model | Years |
|---|---|---|
| CASE SERIES-C CONSTRUCTION KING LOADER BACKHOE (S/N 9111009 & AFTER) | 680CK | 1968 – 1993 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 680E | 1974 – 1978 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 680G | 1978 – 1981 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 680H | 1980 – 1984 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 680K | 1984 – 1988 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 780B | 1981 – 1985 |
| CASE CONSTRUCTION KING LOADER BACKHOE | 780C | 1981 – 1988 |
| CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER) (NORTH AMERICA) | W14 | 1975 – 1986 |
| CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER) | W14FL | 1975 – 1986 |
| CASE UNIT LOADER W/POD CAB (S/N 9119672 & AFTER) | W14H | 1980 – 1986 |
| CASE WHEEL LOADER (S/N 9123140 & AFTER) (NORTH AMERICA) | W18 | 1976 – 1983 |
| CASE WHEEL LOADER (S/N 9123140 & AFTER) (NORTH AMERICA) | W20 | 1976 – 1983 |
| CASE WHEEL LOADER (S/N 9123140 & AFTER) (NORTH AMERICA) | W20B | 1981 – 1993 |
| CASE WHEEL LOADER (NORTH AMERICA) | W20C | 1982 – 1989 |
| CASE WHEEL LOADER | W24C | 1977 – 1985 |