Overview
The ZF 4681.371.002 SHAFT is a critical internal component engineered for the WG100, WG130, and WG131 series transmissions. This OEM genuine part functions as the primary torque-transfer element within the gear train, connecting the input drive to the planetary gear sets. Machined from high-tensile alloy steel, the shaft ensures precise rotational alignment and distributes mechanical loads evenly across the bearing surfaces. The SKU 4681.371.002 is specifically designed to maintain the exacting tolerances required for smooth power delivery in heavy-duty industrial applications. Without this shaft, the transmission cannot engage forward or reverse gears effectively.
Symptoms of Failure
When the ZF 4681.371.002 shaft begins to wear, operators will notice distinct performance degradation. Below are the most common failure indicators:
- Intermittent gear slipping under load: A worn shaft spline or bearing journal causes the gear sets to lose engagement, resulting in sudden power loss during acceleration or uphill operation.
- Metallic grinding noise from the transmission housing: Excessive play in the shaft leads to metal-on-metal contact between the shaft and the planetary carrier, producing a distinct grinding sound during gear changes.
- Oil contamination with metallic particles: As the shaft surface degrades, microscopic steel fragments enter the transmission fluid, visible as glitter in the oil during routine drain inspections.
- Vibration at specific RPM ranges: An unbalanced or bent shaft creates harmonic vibrations that are most noticeable between 1,200 and 1,800 RPM, often misdiagnosed as engine issues.
Technical Specifications
| Part Number | 4681.371.002 |
| Overall Length | 342 mm (13.46 in) |
| Shaft Diameter (Bearing Journal) | 45 mm (1.77 in) |
| Spline Count | 24-tooth involute spline |
| Material | Case-hardened 20MnCr5 alloy steel |
| Weight | 2.8 kg (6.17 lbs) |
| OEM Reference | ZF 4681.371.002 (Genuine) |
| Surface Treatment | Black oxide corrosion resistance |
Compatibility
This shaft is a direct-fit replacement for the following ZF transmission models. Verify your transmission serial number before ordering.
- WG100 Series: All variants including WG100, WG100A, and WG100B (production years 2005–2018)
- WG130 Series: WG130, WG130C, and WG130D (all sub-generations)
- WG131 Series: WG131, WG131E, and WG131F (including high-torque variants)
- BP 210 Series: Compatible with BP 210, BP 210L, and BP 210X gearbox configurations
- BP 230 Series: BP 230, BP 230S, and BP 230T (when used with the 4681.371.002 shaft kit)
Note: This part is not compatible with WG180, WG200, or WG210 series transmissions. For those models, refer to the ZF 4681.371.003 or 4681.371.004 shaft variants.
