Overview
The ZF 4681.373.007 SHAFT is a critical internal component engineered for the WG100, WG130, and WG131 series transmissions. This genuine OEM part functions as the primary torque-transfer interface between the input drive and the planetary gear sets, ensuring precise rotational alignment and load distribution under high-stress industrial conditions. As a hardened steel shaft, it directly supports the clutch packs and synchronizer assemblies within the BP 210 Series and BP 230 Series gearbox architectures. The SKU 4681.373.007 is specifically machined to OEM tolerances to prevent axial play and maintain hydraulic pressure integrity within the valve body circuit.
Symptoms of Failure
When the ZF 4681.373.007 SHAFT begins to degrade, operators will notice distinct operational anomalies. Below are the most common failure indicators:
- Erratic gear engagement under load: A worn shaft spline or bearing journal surface causes the transmission to slip out of gear when climbing grades or carrying heavy payloads. This is often misdiagnosed as a clutch pack issue.
- Persistent oil seepage from the bell housing: Micro-cracks or surface scoring on the shaft’s seal land area allow transmission fluid to bypass the input seal, leading to low fluid levels and eventual overheating.
- Metallic grinding noise during neutral-to-drive shifts: As the shaft’s hardened surface wears, metal particles contaminate the hydraulic circuit, producing a distinct whine or grind that intensifies with RPM.
- Increased vibration at the shift lever: A bent or unbalanced shaft transmits harmonic vibrations through the driveline, felt distinctly in the operator’s cab during acceleration or deceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Overall Length | 342 mm (13.46 in) |
| Journal Diameter (Input Side) | 45.0 mm (1.772 in) |
| Spline Major Diameter | 38.0 mm (1.496 in) |
| Material | Case-hardened 20MnCr5 alloy steel |
| Surface Hardness | 58–62 HRC |
| Weight | 2.85 kg (6.28 lbs) |
| OEM Reference | ZF 4681.373.007 |
Compatibility
This genuine ZF 4681.373.007 SHAFT is precision-machined for direct replacement in the following transmission models. While primarily designed for the WG100, WG130, and WG131 series, it also serves as a retrofit component in earlier WG180 and WG200 units where the input shaft carrier has been upgraded. Cross-verification with the BP 210 and BP 230 gear families confirms fitment in all variants using the 38 mm spline pattern. For WG250 or WG300 applications, consult the ZF parts catalog for the corresponding heavy-duty shaft (part number 4681.373.011).
Supported Transmission Models
- ZF WG100 (all sub-variants)
- ZF WG130 / WG131 (standard and high-torque)
- ZF WG180 (with input carrier modification)
- ZF WG200 (select production years 2015–2020)
- BP 210 Series (A, B, C revisions)
- BP 230 Series (D, E revisions)
