Overview
The ZF 4681.374.003 SHAFT is a critical rotating component engineered for the internal geartrain of the WG100, WG130, and WG131 transmission series. This genuine OEM part, identified by SKU 4681.374.003, functions as the primary torque-transfer element between the input drive and the planetary gear sets. Positioned within the main shaft assembly, it ensures precise alignment and load distribution under high-stress industrial conditions. Designed to meet ZF’s exacting tolerances, this shaft is essential for maintaining the structural integrity of the BP 210 and BP 230 series gearboxes.
Symptoms of Failure
When the ZF 4681.374.003 SHAFT begins to degrade, operators will notice distinct performance issues. Recognizing these signs early can prevent catastrophic transmission damage.
- Persistent gear slipping under load: A worn shaft spline causes intermittent disengagement, leading to power loss during acceleration or heavy lifting.
- Metallic grinding noise from the bell housing: Bearing surface wear on the shaft creates a distinct, high-pitched grinding sound, particularly in neutral or low gear.
- Oil contamination with metallic debris: As the shaft surface erodes, fine steel particles circulate through the lubricant, visible during routine oil changes.
- Vibration at specific RPM ranges: An unbalanced or bent shaft induces harmonic vibrations that resonate through the driveline, worsening over time.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4681.374.003 |
| Overall Length | 312 mm (estimated) |
| Outer Diameter (Spline) | 38 mm |
| Material | Case-hardened alloy steel (20MnCr5) |
| Weight | 2.85 kg |
| OEM Reference | ZF 4681.374.003 |
| Surface Treatment | Black oxide / Phosphated |
Compatibility
This shaft is precision-machined for direct fitment into specific ZF transmission models. While primarily designed for the WG100, WG130, and WG131 series, it also serves as a direct replacement in the following gearbox families:
- BP 210 Series – All sub-variants using the WG100/WG130 core.
- BP 230 Series – Heavy-duty configurations requiring reinforced shaft geometry.
- WG180 – Select late-model units with compatible spline counts.
- WG200 – Limited to units built after 2015 with the updated input shaft design.
Note: Always verify the spline count and overall length against your existing shaft before installation. Cross-reference with your transmission’s serial number for absolute certainty.
