John Deere 4425 Combine Parts

4425 parts and accessories

The John Deere 4425 combine, manufactured from 1981 to 1987, was a popular choice for smaller to medium-sized farms. Powered by a reliable John Deere diesel engine producing around 105 HP, this combine offered efficient grain harvesting. It featured a conventional separator and was available with header widths up to 15 feet, making it well-suited for harvesting wheat, soybeans, and other small grains.

The John Deere 4425 combine was introduced in 1981 as a reliable and affordable option for farmers needing a smaller-class combine. Production continued through 1987. It was powered by a John Deere 4276D 4.5L 4-cylinder diesel engine producing approximately 105 horsepower. The separator used a conventional cylinder system with a 33-inch wide cylinder. This combine offered a grain tank capacity of around 80 bushels with an unloading auger capable of discharging grain at a rate of approximately 30 bushels per minute. Available header widths ranged from 13 to 15 feet. While a chopper was an optional feature, a straw spreader was also available to distribute residue evenly. The cab provided basic operator comfort and controls. This combine was well-suited for harvesting small grains like wheat, oats, and soybeans, particularly on smaller acreages.

Specifications

Engine	John Deere 4276D 105 HP 4.5L Diesel
Separator Type	Conventional - 33-inch Cylinder Width
Grain Tank	80 bushels
Unloading Rate	30 bu/min
Header Widths	13-15 ft
Fuel Capacity	45 gallons
Weight	13,500 lbs
Years Produced	1981-1987

Maintenance Tips

Concave Adjustment: Regularly check and adjust concave clearance to ensure optimal threshing and minimize grain damage.
Belt and Chain Tension: Inspect belt and chain tension frequently. Loose belts and chains can slip, reducing efficiency and potentially causing damage.
Sieve and Chaffer Cleaning: Clean sieves and chaffers regularly to prevent plugging and maintain optimal cleaning performance, especially when switching between crops.
Bearing Greasing: Grease all bearings according to the manufacturer's recommendations to prevent premature wear and ensure smooth operation.

History & Background

The John Deere 4425 was introduced in 1981 as part of John Deere's efforts to provide a compact and efficient combine option. It filled a niche for smaller farms or those needing a secondary combine. While not revolutionary, the 4425 offered reliable performance and simplified maintenance, contributing to its popularity in its time.