331-8905 / 3318905 Engine Oil Pump – for Caterpillar E330D & E336D Excavators (C9 Engine)
The 331-8905 (3318905) engine oil pump is a high-quality replacement lubrication pump designed specifically for Caterpillar C9 and C-9 diesel engines. It is a direct-fit component for CAT E330D, and E336D hydraulic excavators, as well as other heavy equipment platforms powered by the C9 engine family.
Product Overview
This oil pump functions as a gear-type positive displacement pump, circulating pressurized engine oil to the crankshaft and connecting rod bearings, camshaft, valvetrain components, and auxiliary drive gears. It ensures stable lubrication and reliable oil pressure under demanding operating conditions, protecting critical engine surfaces from wear and heat damage.
Key Specifications
| Parameter | Detail |
|---|---|
| Part Number | 331-8905 / 3318905 |
| OEM / Interchange Numbers | 10R-1984, 211-0546, 210-5522, 195-8098, 331-8906 |
| Product Type | Gear Oil Pump / Low-Pressure Circulation Pump |
| Material | Precision-machined Aluminum Alloy |
| Engine Compatibility | CAT C7, C9, C-9, C9.3 |
| Primary Fitment | CAT E330D, E336D,Excavators |
| Approx. Weight | 3–5 kg (varies by source) |
| Dimensions (L×W×H) | 152.4 × 152.4 × 299.72 mm |
Fitment & Compatibility
The 331-8905 oil pump is compatible with a wide range of Caterpillar machinery, including:
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Motor Graders: 12H, 140M, 160M
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Track-Type Tractors: D6R, D6T, D7R
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Wheel Loaders / Other: 973C, 973D, 816F II
Quality & Performance
This oil pump is manufactured to meet or exceed OEM specifications. The aluminum alloy housing and precision gear set provide consistent oil flow and pressure, supporting long service intervals and dependable engine protection. It is suitable for both original equipment replacement and aftermarket maintenance applications.
Why Choose This Oil Pump
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Direct replacement for CAT part number 331-8905
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Compatible with the widely used C9 / C-9 engine platform
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Precision-machined aluminum alloy construction for durability
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Designed for stable lubrication in excavators and other heavy-duty applications
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Cost-effective alternative to OEM parts without compromising fit or function
Note: Please verify the exact part number on your existing pump before ordering, as Caterpillar uses several interchangeable numbers across different production batches. For bulk orders or wholesale pricing, contact the supplier directly with your specific engine serial number.