ZF 2093.303.051 COUNTERSHAFT for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 2093.303.051 COUNTERSHAFT is a critical torque-transfer component engineered for the WG100, WG130, and WG131 series transmissions. This OEM genuine part serves as the primary intermediate shaft that distributes rotational force from the input gearset to the output assembly, ensuring smooth power delivery in heavy-duty industrial drivetrains. The countershaft works in concert with the 5838109009: DIFFERENTIAL to manage load distribution across the axle system. Manufactured from case-hardened alloy steel, SKU 2093.303.051 is precision-ground to OEM tolerances for minimal backlash and extended service life in demanding applications such as construction loaders and agricultural tractors.

Symptoms of Failure

• Gear grinding or whining noise during acceleration — Worn countershaft splines cause misalignment, producing a distinct metallic grinding sound under load. This often indicates the need for immediate replacement of the countershaft along with the 0750117075: TAPER ROLLER BEARING that supports it.
• Intermittent gear slipping under heavy torque — As the countershaft surface wears, it loses its ability to maintain constant gear mesh engagement, leading to sudden power loss during uphill climbs or loaded operation.
• Metallic debris in transmission oil — Flaking or pitting on the countershaft surface sheds fine steel particles into the lubricant, visible during routine oil changes. This debris can damage the 2093209023: DIFFERENTIAL if not addressed promptly.
• Excessive axial play at the shaft end — A worn countershaft bearing journal allows lateral movement, causing the shaft to contact the 5838300626: DIFFERENTIAL HOUSING and generating heat and vibration.

Technical Specifications

Compatibility

This countershaft is specifically designed for ZF WG-series transmissions. Verified compatible models include: WG100, WG130, WG131, WG180, and WG200. It also fits select WG121 and WG150 variants used in off-highway vehicles. Always cross-reference your transmission serial number with the OEM parts catalog to confirm fitment. The countershaft interfaces directly with the 5838109009: DIFFERENTIAL assembly and requires the 0750117075: TAPER ROLLER BEARING for proper installation.

Related Components

Frequently Asked Questions

Q: Can the 2093.303.051 countershaft be used in a ZF WG180 transmission?
A: Yes, this countershaft is compatible with WG180 models. However, always verify the spline count and overall length against your existing shaft, as minor revisions exist between early and late production runs.

Q: What other parts should I replace when installing a new countershaft?
A: We strongly recommend replacing the 0750117075: TAPER ROLLER BEARING and all associated thrust washers (5838300811, 5838300753, 5838300818) simultaneously to prevent premature wear on the new shaft.

Q: How do I identify a genuine ZF 2093.303.051 part?
A: Genuine OEM parts feature laser-etched part numbers on the shaft body and a matte finish from the case-hardening process. Counterfeit parts often have rough spline edges and inconsistent hardness markings.

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