Komatsu mini excavators and Kobelco compact equipment frequently use Yanmar diesel engines as their power units — making Yanmar injector part numbers the correct reference for these machines. The Yanmar 3D84E-3, 3D84N-2, 3D88E-3, 4D84E-3, and 4D88E-3 are compact 3- and 4-cylinder diesel engines powering the Komatsu PC35R-8 and PC45R-8 mini excavators and the Kobelco SK05J-2 skid steer loader. When an injector fails, you'll experience hard starts, rough running, excessive smoke, misfires, and reduced digging or lifting power. This brand-new aftermarket injector is a direct replacement for Yanmar part number YM729503-53100, covering four cross-reference formats across Yanmar OEM and non-prefix numbering.

✅ Direct-Fit Compatibility

• Yanmar Engines: 3D84E-3, 3D84N-2, 3D88E-3, 4D84E-3, 4D88E-3
• Komatsu Mini Excavators: PC35R-8, PC45R-8
• Kobelco Skid Steer Loader: SK05J-2
• Bolt-on replacement — no modifications required

🔧 Product Highlights

• 100% Brand New Aftermarket: Not rebuilt or refurbished — starts with a full service life
• OEM-Spec Fuel Atomization: Precise spray pattern for clean combustion, restored power, and reduced smoke under load
• Targeted Single-Unit Replacement: Ideal when diagnostics confirm one failed injector
• 4 Cross-Reference Part Numbers: Covers Yanmar OEM (YM-prefix) and non-prefix formats for confirmed fitment
• Cross-Brand Coverage: One part number fits Komatsu and Kobelco compact equipment powered by Yanmar engines
• No Dealer Markup: OEM-equivalent quality at aftermarket pricing

📦 What's Included

• 1 × Fuel Injector (YM729503-53100 / 729503-53100)

🔑 Key Specs

• Part Numbers: YM729503-53100, YM72950353100, 729503-53100, 72950353100
• Condition: 100% New Aftermarket
• Quantity: 1 piece (single cylinder replacement)
• Fitment: Yanmar 3D84E-3 / 3D84N-2 / 3D88E-3 / 4D84E-3 / 4D88E-3 engines; Komatsu PC35R-8 / PC45R-8 excavators; Kobelco SK05J-2 skid steer loader

Please verify your engine serial number and existing part number before ordering. Contact us for fitment confirmation if needed.