Caterpillar Buna N O-Ring, PAI 321236 (OEM 4L9564), Pack of 5
Used In These Kits
This part is included in 16 engine & overhaul kits — find yours below.
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331128Cat / Caterpillar OVERHAUL GASKET KIT In stock -
331129Cummins OVERHAUL GASKET KIT In stock -
331192Caterpillar 3300 / 3306 Upper Gasket And Sealkit In stock -
331193Cat / Caterpillar 3306 ENGINE UPPER GASKET KIT In stock -
331194Cat / Caterpillar UPPER GASKET KIT In stock -
331195Cat / Caterpillar UPPER GASKET KIT In stock -
331197Cat / Caterpillar UPPER GASKET KIT In stock -
331198Cat / Caterpillar UPPER GASKET KIT In stock -
331199Cat / Caterpillar UPPER GASKET KIT In stock -
331200Cat / Caterpillar UPPER GASKET KIT In stock -
331202Cat / Caterpillar UPPER GASKET KIT In stock -
331206Cat / Caterpillar UPPER GASKET KIT In stock - 331220ENGINE OVERHAUL GASKET KIT View ›
- 331327FUEL PUMP GASKET KIT View ›
- 331328UPPER GASKET KIT View ›
- 331449ENGINE OVERHAUL GASKET KIT View ›
- No kits match that search.
Suggested Additional Parts
Commonly sold with this product. These parts are sold separately.
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321285Caterpillar 3406E/C15/C16/C18 Fuel Injection O-Ring Kit, PAI (OEM 2481394), Pack of 1 In stock -
331210Caterpillar 3406E Segmented Oil Pan Gasket, PAI (OEM 4N1151), Pack of 2 In stock -
331213Cat / Caterpillar TURBOCHARGER OIL PRESSURE GASKET (Pack of 5) In stock -
340632-010Cat / Caterpillar 3406E SERIES INFRAME ENGINE KIT In stock -
042100WATER FERRULE (Pack of 5) Confirm lead time
| Brand | PAI Industries |
| Part Category | Seals & O-Rings |
| Sub-Type | O-Ring |
| Engine Make | Caterpillar |
| Engine Model | 3300 |
| Condition | New |
| Stage / Tier | Standard |
PAI 321236 is a buna n o-ring for Caterpillar applications. PAI specifies Buna N construction. The manufacturer designates product-level OEM 4L9564. PAI cross-references Caterpillar 4L9564. PAI lists these application categories: Caterpillar 3300 Series. Confirm the complete required part number before ordering.
Pack of 5.
Manufacturer product cross-references
Caterpillar 78-5410
Caterpillar 785410
Caterpillar 8T7276
Cummins 145613
PAI Part #: 321236
OEM References:
- CATERPILLAR 4L9564
- CATERPILLAR 78-5410
- CATERPILLAR 785410
- CATERPILLAR 8T7276
- CUMMINS 145613
Applications:
- CATERPILLAR 3300 SERIES
Warranty: 2.0 year(s)
These catalog references may identify this part or components in an assembly. A listed number alone does not confirm whole-assembly interchange or vehicle fitment. Confirm the required part before ordering.
| Number |
|---|
| 4L9564 |
| 78-5410 |
| 785410 |
| 8T7276 |
| 145613 |
| CATERPILLAR 4L9564 |
| CATERPILLAR 78-5410 |
| CATERPILLAR 785410 |
| CATERPILLAR 8T7276 |
| CUMMINS 145613 |
| PAI 321236 |
No cross-reference numbers match that search.
Discovery models are listed below. Confirm the complete application and any ESN/CPL or size restrictions before ordering.
Most PAI parts carry a 2-year unlimited-mileage PAI warranty — 3 years on the High Performance tier, 1 year on Excel by PAI. See Warranty & Returns for full coverage terms, or call a specialist to confirm the exact coverage on this part.
PAI published warranty tiers: High Performance — 3-Year · Genuine PAI — 2-Year · Excel — 1-Year, unlimited mileage. The badge beside the price shows this product's recorded term; when no badge is shown, confirm coverage with a specialist.

















