ZF 4644.303.099 SPUR GEAR for WG181 | OEM Genuine Part

Overview

The ZF 4644.303.099 SPUR GEAR is a critical power transmission component engineered specifically for the WG 181 series transmission. This OEM genuine part functions as a precision-machined gear that transfers rotational force between shafts within the planetary gearset, ensuring smooth torque delivery and load distribution under high-stress industrial conditions. The SKU 4644.303.099 is positioned in the intermediate shaft assembly, directly meshing with adjacent planetary gears to maintain correct gear ratios. When paired with a robust TRANSMISSION HOUSING, this spur gear provides the durability required for heavy-duty applications in construction, mining, and material handling equipment.

Symptoms of Failure

• Audible gear whining or grinding noises during acceleration or deceleration, indicating worn tooth profiles on the spur gear.
• Intermittent gear slipping under load, often accompanied by vibration, which signals that the gear teeth have lost their precise engagement tolerances.
• Metallic debris in transmission fluid during routine oil changes, a clear sign of spalling or pitting on the spur gear surface.
• Erratic shifting or delayed engagement when the transmission is cold, pointing to excessive backlash caused by gear wear.

Technical Specifications

Compatibility

This spur gear is primarily designed for the ZF WG 181 series transmission, but it also fits select models in the WG 180, WG 200, and WG 210 families due to shared planetary gear architecture. It is commonly used in off-highway vehicles such as wheel loaders, dump trucks, and agricultural tractors. For proper installation, ensure the gear is paired with a compatible HOUSING and secured using a THREADED BUSH. Always verify the TYPE PLATE on your transmission to confirm model-specific fitment before ordering.

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