✅ Compatibility

• Make: Caterpillar (CAT)
• Engine: Mitsubishi S3Q2 / S4Q2T — compact liquid-cooled diesel
• OEM / Cross Reference Part Numbers:
  • CAT: 280-3784 / 2803784 / CA2803784 / 6110015812544
  • Mitsubishi: M2T66271 — M8T70371 / M008T70371 — M8T71571 / M008T71571 — M8T75171 / M008T75171
  • Mitsubishi (also): 32A66-10100 / 32A66-10101 / 32A6610600 / 32A6620601 / 32A6630600
  • Lucas: LRS02218 / LRS2218 — Farcom: 107711
• Fits Caterpillar Mini Excavators (Mitsubishi S3Q2 / S4Q2T engine):
  • 303.5C — 303.5D — 303C CR — 304C CR — 304D CR
  • 305.5D — 305C CR — 305D CR
• ⚠️ Fitment Note: Verify CAT excavator model, serial number, engine model (S3Q2 or S4Q2T), and existing starter part number before ordering. Contact us to confirm fitment.

🔧 Product Highlights

• Direct OEM Replacement — CAT 280-3784 / Mitsubishi M8T70371 12V 10T 2.2kW Starter for CAT 303–305 Series Mini Excavators: Drop-in fit for all compatible Caterpillar 300-series mini excavators with Mitsubishi S3Q2 / S4Q2T engine — matches original CAT / Mitsubishi starter specifications
• 15+ OEM Cross-References — CAT, Mitsubishi, Lucas, and Farcom: Covers all known CAT and Mitsubishi part number variants — correct identification across all major construction equipment parts catalogs globally
• Mitsubishi S3Q2 / S4Q2T — Mitsubishi’s Compact Diesel Engine Family in CAT 300-Series Mini Excavators: The Mitsubishi S3Q2 and S4Q2T power the most widely used CAT mini excavator range — known for reliability and long service life in compact earthmoving applications
• CAT 303 / 304 / 305 Mini Excavators — Among the Most Widely Used Compact Excavators in Construction and Landscaping: Trusted by contractors, landscapers, utility crews, and rental fleets globally for tight-access excavation, trenching, and grading — large installed base with strong aftermarket demand
• Common Maintenance Item on High-Hours CAT Mini Excavators: Symptoms: slow cranking, grinding on engagement, or intermittent no-start — immediate replacement eliminates jobsite downtime and protects engine starting components

📦 What’s Included

• 1× Starter Motor 12V 10T 2.2kW — New Aftermarket (CAT 280-3784 / Mitsubishi M8T70371)

🔑 Key Specs

• CAT: 280-3784 / 2803784 / CA2803784 / 6110015812544
• Mitsubishi: M2T66271 — M8T70371 / M8T71571 / M8T75171 — 32A66-10100 / 32A66-10101 / 32A6610600 / 32A6620601 / 32A6630600
• Lucas: LRS02218 / LRS2218 — Farcom: 107711
• Voltage: 12V — Teeth: 10T — Power: 2.2kW
• Engine: Mitsubishi S3Q2 / S4Q2T
• Equipment: CAT 303.5C / 303.5D / 303C CR / 304C CR / 304D CR / 305.5D / 305C CR / 305D CR mini excavators
• Condition: New Aftermarket — SKU: 280-3784

⚠️ Verify CAT excavator model, serial number, engine model (S3Q2 or S4Q2T), and existing starter part number before purchasing. Contact us with model and S/N if unsure — we are happy to confirm fitment.