ZF 2093.303.040 COUNTERSHAFT for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 2093.303.040 COUNTERSHAFT is a critical torque-transfer component engineered specifically for the WG100, WG130, and WG131 transmission series. As an OEM genuine part (SKU: 2093.303.040), it serves as the primary intermediary shaft that distributes rotational force from the input shaft to the output assembly, ensuring synchronized gear engagement under heavy loads. This countershaft works in concert with the 5838109012: DIFFERENTIAL to maintain precise power flow within the drivetrain. Precision-ground gear teeth and induction-hardened journals allow this component to withstand continuous high-torque operation in commercial vehicles and industrial machinery.

Symptoms of Failure

• Growling or whining noise during acceleration — Worn countershaft bearings or damaged gear teeth produce a distinct metallic sound that intensifies under load, often mistaken for differential noise.
• Intermittent gear slipping or jumping out of gear — Excessive axial play in the countershaft causes misalignment, leading to incomplete gear engagement and sudden loss of drive power.
• Metal particles in transmission fluid — Flaking or pitting on the countershaft surface sheds debris into the oil, visible during routine drain intervals and indicating imminent failure.
• Vibration through the gear lever or chassis — A bent or unbalanced countershaft creates rhythmic shuddering that worsens at specific RPM ranges, affecting shift quality.

Technical Specifications

Compatibility

This countershaft is designed for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with select variants of the WG180 and WG200 series where the countershaft length and spline count match. For proper installation, the 0750117075: TAPER ROLLER BEARING must be replaced simultaneously to maintain correct preload. The countershaft interfaces directly with the 2093209023: DIFFERENTIAL and is housed within the 5838300626: DIFFERENTIAL HOUSING assembly. Always verify your transmission serial number against OEM fitment charts before ordering.

Related Components

Frequently Asked Questions

Q: Can the ZF 2093.303.040 countershaft be installed without replacing the taper roller bearing?
A: No. The 0750117075: TAPER ROLLER BEARING must always be replaced with the countershaft to maintain correct preload and prevent premature wear. Reusing the old bearing risks misalignment and rapid failure.

Q: How do I identify if my WG130 transmission uses this specific countershaft?
A: Check the stamped part number on the shaft body near the splined end. The OEM number 2093.303.040 should match. Additionally, measure the overall length (385 mm) and gear diameter (95 mm) to confirm compatibility with your housing.

Q: What is the typical service life of this countershaft under normal operating conditions?
A: With proper lubrication and regular fluid changes, the ZF 2093.303.040 typically lasts 300,000 to 500,000 km in highway applications. Heavy off-road use or frequent shock loading can reduce this interval significantly.