ZF 2095.309.066 SUN GEAR SHAFT for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 2095.309.066 Sun Gear Shaft is a critical torque-transfer component located within the planetary gear set of ZF WG-series transmissions. As the central driving element, it meshes directly with planetary pinions to distribute engine power through the differential assembly. This OEM genuine part, identified by SKU 2095.309.066, ensures precise gear alignment and minimal backlash under heavy loads. It works in concert with the 2095109011 DIFFERENTIAL to manage rotational force distribution, making it indispensable for maintaining drivetrain integrity in commercial vehicles.

Symptoms of Failure

• Intermittent gear slipping under load — A worn sun gear shaft loses tooth engagement, causing sudden power loss during acceleration or climbing.
• Metallic grinding noise from transmission housing — Damaged splines or pitted gear teeth produce a distinct whining or grinding sound, especially in lower gears.
• Contaminated transmission fluid with metal particles — Flaking surface material from the shaft mixes with oil, visible as silver or dark debris during fluid changes.
• Erratic shifting or delayed engagement — Excessive play in the sun gear shaft disrupts hydraulic pressure timing, leading to harsh or delayed gear changes.

Technical Specifications

Compatibility

This sun gear shaft is engineered for ZF WG100, WG130, and WG131 transmissions, commonly found in medium-duty trucks, buses, and construction equipment. It also fits select WG180 and WG200 variants when paired with the correct 0750117075 TAPER ROLLER BEARING and 2095209037 DIFFERENTIAL assembly. Always verify your transmission model tag before installation, as the 2095309059 DIFF.HOUSING may require specific shaft variants for proper clearance.

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