John Deere 420 Replacement Engine

The John Deere 420 is a legendary compact utility tractor, prized for its durability, versatility, and classic performance. Whether you're restoring a collector's item or maintaining your daily-use tractor, our replacement engines are engineered to deliver OEM-level performance and reliability.

Contact our expert engine team today to find the right solution for your equipment.

Don't worry if you don't see a dedicated engine replacement listed below— Small Engine Warehouse has a team of experienced specialists ready to help you find the right engine replacement.

Original Engine

• Engine Type: 20 hp Onan B48G
• Displacement: 782cc (47.7 cu in)
• Cooling: Air-cooled with dry filter and pre-cleaner
• Lubrication: Full-pressure with replaceable filter
• Crankshaft: Horizontal alignment
• Fuel System: Pulse pump + fixed jet carburetor
• Ignition: Electronic | Starter: 12V solenoid

 

John Deere 420