Fitment and Service Notes
The 1R-0750 is the final fuel filter the fuel sees before the injectors on most heavy-bore Cat diesels. At 2-micron absolute, the media is finer than the 3-micron rating of the 1R-0749 primary element — that is by design: the primary stage takes out the bulk contamination, the secondary polishes the fuel for high-pressure injectors. On C13/C15 trucks Cat commonly pairs the 1R-0750 with the 175-2949 fuel/water separator as the primary stage instead.
Because the filter base thread size changed across the engine range, the 1R-0750 (1"-14 UN) only fits machines with the 1-inch port — Cat C7/C9 and 3116/3126 engines use the 7/8"-thread 1R-0751. Read the number stamped on your old filter and send it to us with your engine serial; we confirm the variant before anything ships.
Cross-Reference & Pricing
| Brand | Equivalent part number |
|---|---|
| Caterpillar (OEM) | 1R-0750 / 1R0750 |
| Fleetguard | FF5320 |
| Donaldson | P551313 |
| Baldwin | BF7633 |
| WIX | 33528 |
| Hastings | FF1079 |
| Luber-finer | LFF3347 |
| NAPA | 3528 |
| Sakura | FC5507 |
US listings checked August 2026: genuine Cat 1R-0750 elements sell around USD 30 at online parts retailers, with aftermarket equivalents from about USD 20. On our side, order volume is the main lever — tell us your annual consumption and we quote FOB Shanghai pricing, with the 1R-0749 primary bundled at a set price for the pair.
FAQ
Q: Is the 1R-0750 a primary or secondary fuel filter?
A: It is the secondary (final-stage) spin-on fuel filter, fitted after the primary stage and before the injectors, with 2-micron absolute cellulose media. On most Cat applications it is paired with the 1R-0749 Advanced Efficiency element, and the two are changed together.
Q: What thread and dimensions does the 1R-0750 use?
A: The 1R-0750 has a 1"-14 UN thread and measures 7.15 in (181.5 mm) long with a 3.37 in (85.7 mm) outer diameter. It is the heavier-port version of the family — machines with a 7/8" port use the 1R-0751 instead.
Q: Which engines does the 1R-0750 fit?
A: Cat 3208, 3306/3306B, 3406/3406B/3406C/3406E, C10, C11, C12, C13, C15, C16 and C18 engines. On C13/C15 trucks it is frequently paired with the Cat 175-2949 fuel/water separator as the primary stage. Confirm your engine serial number before ordering.
Q: How do I order this filter from CN Machinery?
A: Message us on WhatsApp or email sales@cn-machinery.com with your machine model, serial number and the numbers on your old filters. Stock items dispatch in 3–7 days, FOB Shanghai or CIF to your port, with payment by T/T.
Need This Element for Your Cat?
Send your engine serial and the number on your old filter — we confirm fitment, quote a price (with the 1R-0749 primary if you need the pair) and arrange shipping within 24 hours.
Chat on WhatsApp Email sales@cn-machinery.com