John Deere Engine Oil Pump Drive Gear, 20-Tooth Press Fit, for 4020 Tractor

Fits Models At A Glance:

John Deere Tractors:

• 400

• 3010 Before Serial Number 280000 with 4.270 4 Cylinder and Early Power Booster

• 3020 with 4.270 4 Cylinder and Early Power Booster

• 4000 Before Serial Number 335845 with 6.404D 6 Cylinder

• 4010 Before Serial Number 214999 with 6.404D 6 Cylinder

• 4020 Before Serial Number 335845 with 6.404D 6 Cylinder

John Deere Industrial & Construction:

• 500 Before Serial Number 280000 with Early Power Booster and 4.270

• 500C After Serial Number 280000 with 4.270 4 Cylinder,

• 510 After Serial Number 280000 with 4.270 4 Cylinder

• 600 Before Serial Number 335845 with 6.404D 6 Cylinder

John Deere Engine Applications:

• 6404 Before Serial Number 214999, 6.404D Early Power Booster 6 Cylinder

Common Use Case or Symptoms:

Use when oil pressure drops at idle, the pump drive is worn or spun on the shaft, or the gear teeth are chipped — a slipping oil pump drive gear starves the bottom end and does not announce itself first.

Key Notes:

• Part Numbers: R45134, 156260
• Weight: 3.02 lbs
• Application: Engine oil pump drive gear
• Dimensions: 20 tooth
• Style/Type: Late style, press fit, without keyway
• Serial Number Notes: The 4.270 machines split at Serial Number 280000 and the 6.404D machines at Serial Number 335845, with the 4010 and the 6404 engine at Serial Number 214999. A & I also lists an all-models entry for tractors Before Serial Number 214999 with the 6.404D early power booster engine — confirm your engine before ordering.
• Manufacturer: A & I Products
• Replacement Part for John Deere Equipment

Why Choose Broken Tractor:

• ✅ Press Fit Without a Keyway: This is the late style gear. The early gear is keyed, so the shaft you are fitting decides which one you need — look before you order.
• ✅ Engine, Not Just Model: Fitment turns on the 4.270 four cylinder or the 6.404D six, and both are named against every machine above.
• ✅ Twenty Teeth, Stated: The tooth count is the quick confirmation once the gear is off the pump shaft.