Overview
The ZF 4681.371.008 SHAFT is a precision-machined internal component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as the primary torque-transfer element within the gear train, ensuring synchronized rotation between the input and output assemblies. Designed to withstand high cyclic loads, the shaft maintains axial alignment and reduces vibrational stress on adjacent bearings and gears. The SKU 4681.371.008 is manufactured to ZF’s original tolerances, making it a direct replacement for worn or damaged units in BP 210 and BP 230 series applications. Without this shaft, the transmission cannot deliver consistent power flow, leading to drivetrain inefficiency.
Symptoms of Failure
When the ZF 4681.371.008 shaft degrades, operators typically notice these specific failure indicators:
- Gear slipping under load – The shaft’s splines wear, causing intermittent disengagement between gears during acceleration or hill climbs.
- Metallic grinding noise from the transmission housing – Worn journal surfaces create metal-on-metal contact, producing a distinct scraping sound at low RPM.
- Oil contamination with metallic particles – Flaking material from the shaft surface mixes with transmission fluid, visible as glitter in the oil pan during drain intervals.
- Vibration in the driveline at cruising speed – Loss of concentricity in the shaft induces harmonic oscillations felt through the chassis at 40–60 km/h.
Technical Specifications
| Parameter | Value |
|---|---|
| Overall Length | 312 mm |
| Outer Diameter (bearing seat) | 45 mm |
| Spline Count | 24 (involute profile) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 2.85 kg |
| OEM Reference | ZF 4681.371.008 |
| Surface Hardness | 58–62 HRC |
Compatibility
This shaft is validated for direct installation in the following ZF transmission models:
- WG100 – All sub-variants (WG100A, WG100B) used in medium-duty trucks.
- WG130 – Standard and heavy-duty configurations for construction equipment.
- WG131 – High-torque variants with reinforced output stages.
- BP 210 Series – Drop-in replacement for shaft positions 1–3 in the gear cluster.
- BP 230 Series – Compatible with both synchronized and unsynchronized versions.
Cross-reference with ZF parts catalogues confirms the 4681.371.008 also fits select WG180 and WG200 units when used with the correct bearing spacer kit. Always verify spline engagement before final assembly.
