ZF 4474.393.024 PINION | OEM Genuine Part

Overview

The ZF 4474.393.024 PINION is a critical high-torque gear component engineered for the final drive assembly of heavy-duty construction machinery transmissions. This OEM genuine part, identified by SKU 4474.393.024, serves as the primary interface between the transmission output shaft and the differential ring gear, converting rotational speed into the mechanical force required to move massive loads. Precision-ground helical teeth ensure smooth power transfer under extreme stress, while the case-hardened alloy steel construction resists pitting and deformation in abrasive environments. As a direct replacement for worn or damaged pinions, this component restores driveline integrity and eliminates backlash that compromises machine control.

Symptoms of Failure

When the ZF 4474.393.024 pinion begins to degrade, operators will notice distinct performance issues. Audible whining or howling from the transmission housing during acceleration or deceleration indicates uneven tooth wear or surface spalling. Vibration through the chassis and operator seat at specific road speeds suggests the pinion has developed eccentricity or chipped teeth. Intermittent driveline clunking when shifting between forward and reverse points to excessive backlash caused by pinion tooth profile degradation. Metal particles in the transmission fluid filter confirm active wear debris generation, requiring immediate inspection of the pinion and mating ring gear.

Technical Specifications

Compatibility

This pinion is engineered for integration with ZF’s heavy-duty powershift transmission series commonly deployed in construction loaders, graders, and dump trucks. Primary compatible models include the ZF WG180, ZF WG200, and ZF WG210 series transmissions. It also fits select variants of the ZF Ergopower and ZF Ecolite drivelines used in mid-range wheel loaders. The 4474.393.024 pinion mates exclusively with ring gears having a 47-tooth count and a 3.36:1 final drive ratio. Always verify the transmission serial number and existing gear set pairing before installation, as minor spline variations exist between early and late production units.

Installation Notes

• Requires replacement of the companion ring gear if wear exceeds 0.15 mm tooth clearance.
• Preload adjustment using shims is mandatory to achieve proper bearing contact pattern.
• Use only OEM-grade thread locker on the pinion nut (torque to 450 Nm).