Searching for a heavy-duty 1786539 or 178-6539 oil pump replacement? This critical lubrication component is engineered for CAT 3306 and 3304 series diesel engines. As a primary Procurement Search Term for fleet managers, this pump ensures consistent oil flow to crankshaft bearings and turbochargers, preventing premature engine wear in high-load construction environments.
Our OEM-standard replacement is built to handle the rigorous demands of CAT D6R, D7R, and 330B series machinery, offering the reliability of original parts at a competitive price point for global overhaul projects.
| Technical Attribute | Specification Details |
|---|---|
| Part Number | 1786539 / 178-6539 |
| Engine Models | CAT 3306, 3306B, 3304, 3304B |
| Compatible Machine Models | Excavators: 330, 330B, 330L, 350, 235 Track-Type Tractors: D6R, D7R, D6G, D6H, D7H Wheel Loaders: 966F, 966G, 970F, 972G Motor Graders: 12H, 14H, 140H, 143H, 160H, 163H Compactors: 815B, 816B |
| Product Name | Engine Lubrication Oil Pump Assembly |
| Condition | Brand New, OEM Standard Replacement |
| MOQ | 1 Piece |
| Delivery Methods | Express: DHL Fedex EMS UPS or by Air/Sea |
| Packaging | Industrial Export Packing |
| Stock Status | In Stock / Fast Dispatch |
| 6 Core Procurement Points | Standard Aftermarket | Our OEM-Standard Replacement |
|---|---|---|
| 1. Casting Quality | Standard Cast Iron | High-strength Alloy Casting for Thermal Stability |
| 2. Gear Precision | General Tolerance | Micron-level Precision Machining for Maximum Flow |
| 3. Pressure Rating | Variable at high temp | Sustained High-Pressure Output (OEM Spec) |
| 4. Seal Integrity | Nitril Rubber | High-temperature Viton/Advanced Composite Seals |
| 5. Direct Fitment | Modifications might be needed | 100% Bolt-on Compatible for CAT 3306 Engines |
| 6. Fleet Reliability | Short-term Fix | Long-term Durability for Mining and Heavy Construction |
In many cases involving the 3306 engine, worn oil pump gears or a stuck relief valve in the 1786539 assembly is the culprit. If you notice a sudden drop in pressure during operation, inspect the oil pump immediately to avoid catastrophic engine seizure. Replacing with a new 178-6539 unit is often more cost-effective than attempting a rebuild of a scored pump body.
This pump is designed for specific 3306 and 3304 configurations found in earthmoving equipment. Always verify your engine serial number prefix. We support identifying potential risks during maintenance to ensure you get the exact replacement parts required for your specific build.
Our units feature an OEM-standard tri-metal structure and are trusted by repair shops and equipment fleets globally for their reliability in high-dust and high-heat environments.
Not sure how this issue affects your equipment?
Our technical team helps operators manage their maintenance cycles effectively:
Identify potential risks during maintenance (Pump wear, filter debris)
Recommend suitable replacement parts if needed (1786539, 178-6539)
Support both inspection advice and parts supply for 3306 engine series
Using the correct 1786539 replacement prevents unplanned downtime and extends the service life of your CAT motor grader or excavator.
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Visit Our Facebook ProfileWe are a specialized supplier for Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, and Weichai engines. We provide complete engine solutions from small seals to full engine assemblies.
Main Engine Products: Cylinder Liners, Pistons, Piston Rings, Main Bearings, Con Rod Bearings, Thrust Washers, Overhaul Gasket Kits, Fuel Injection Pumps, Injectors, Crankshafts, Turbochargers, Water Pumps, Oil Pumps, Cylinder Blocks, Cylinder Heads, and Connecting Rods.
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