ZF 0631.306.076 CYLINDRICAL PIN for WG100 | OEM Genuine Part

Overview

The ZF 0631.306.076 CYLINDRICAL PIN is a precision-engineered locating and alignment component designed specifically for the WG 100 series transmission family. This OEM genuine part serves as a critical dowel or pivot pin within the planetary gearset and differential assembly, ensuring exact positioning of internal components under high torque loads. The SKU 0631.306.076 is manufactured to ZF’s original tolerances, providing a secure interference fit that prevents rotational movement of adjacent parts. When installed correctly, this cylindrical pin maintains the concentric alignment of the 5838109012: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING, directly influencing gear mesh accuracy and overall transmission durability.

Symptoms of Failure

• Abnormal gear whine or growling during acceleration: A worn or sheared cylindrical pin allows the 2093209023: DIFFERENTIAL to shift out of its designed plane, causing uneven tooth contact and audible noise under load.
• Intermittent gear slipping or delayed engagement: When the pin loses its press-fit integrity, the 5838300626: DIFFERENTIAL HOUSING can experience micro-movement, leading to inconsistent clutch pack application and power loss.
• Metallic debris in transmission fluid: Fretting wear on the pin’s outer diameter generates fine steel particles that contaminate the oil, often first noticed during routine filter inspections.
• Increased backlash in the drivetrain: A fatigued pin fails to maintain zero-clearance positioning, resulting in a noticeable clunk when shifting between forward and reverse gears.

Technical Specifications

Compatibility

This cylindrical pin is primarily designed for the ZF WG 100 series, including models WG100, WG120, and WG150. It is also commonly used in the differential carrier assemblies of WG180 and WG200 transmissions where the same pin diameter and length are specified. The part interfaces directly with the 5838300626: DIFFERENTIAL HOUSING and the 0750117075: TAPER ROLLER BEARING bore. Always verify your transmission’s serial number against ZF’s parts catalog, as later revisions of the WG200 may use an alternative pin length.

Related Components

Frequently Asked Questions

Q: Can I reuse the 0631.306.076 pin after disassembly?
A: No. This is a one-time-use interference-fit pin. Removal damages its surface hardness and diameter tolerance. Always replace with a new OEM pin to prevent premature wear of the differential housing bore.

Q: Does this pin require lubrication during installation?
A: Yes. Apply a thin film of ZF-approved assembly grease (or clean transmission fluid) to the pin’s outer surface before pressing it into the bore. Dry installation can cause galling and misalignment.

Q: How do I know if my WG100 needs this pin replaced?
A: If you observe any of the failure symptoms listed above—especially metallic debris or increased backlash—inspect the pin for fretting wear or shear. It is often replaced proactively during a full differential rebuild alongside the taper roller bearing and thrust washers.