Main Shaft Fiat

This Main Shaft Assembly (OEM # 598173, 4985299, 04985299) is a critical drivetrain component for Fiat tractors, responsible for transferring power from the engine to the gearbox and ultimately to the wheels or PTO systems. Crafted from high-strength alloy steel, the shaft undergoes precision forging and heat treatment to withstand torsional stress, heavy loads, and harsh operating conditions. Its splined ends and hardened surfaces ensure seamless engagement with gears and bearings, maintaining smooth power delivery during demanding tasks like plowing, tilling, or hauling. OEM-grade engineering guarantees exact dimensions and compatibility, reducing wear on connected components and prolonging drivetrain life.

The assembly includes multiple part numbers (598173, 4985299, 04985299), which may correspond to variations for different Fiat tractor models or production years. The hardened steel construction resists bending, shearing, and fatigue, making it ideal for tractors operating in rocky, muddy, or uneven terrain. Whether replacing a damaged shaft or upgrading during a transmission rebuild, this component restores factory performance and reliability. Applications include Fiat agricultural tractors used in fieldwork, construction, or forestry, where drivetrain integrity is paramount.

Rigorously tested to meet Fiat’s OEM standards, this main shaft assembly ensures longevity and efficiency. Proper installation requires adherence to torque specifications, alignment checks, and lubrication of splines with high-quality grease. Always verify compatibility using your tractor’s model number, VIN, or consult the service manual. Avoid aftermarket substitutes to prevent drivetrain failure and ensure optimal safety.