Overview
The ZF 2094.304.080 MAIN SHAFT is a critical rotating component engineered for the WG100, WG130, and WG131 series transmissions. This OEM genuine part transmits torque from the input shaft through the gear train to the output flange, directly influencing shift quality and power delivery. The SKU 2094.304.080 is precision-machined to maintain concentricity under heavy loads, ensuring that the gear sets remain properly aligned during operation. This main shaft interfaces directly with the TRANSMISSION HOUSING and the HOUSING assembly, where it is supported by bearings and sealed to prevent lubricant loss.
Symptoms of Failure
- Gear slipping under load: A worn main shaft spline or bearing journal causes the gear cluster to lose positive engagement, resulting in intermittent power loss during acceleration.
- Transmission oil leaks at the output flange: When the main shaft surface wears or develops scoring, the shaft seal fails, leading to visible drips from the rear of the transmission housing.
- Excessive driveline vibration: A bent or fatigued main shaft creates harmonic vibrations that intensify at highway speeds, often accompanied by a low-frequency hum from the gearbox.
- Difficult gear engagement: Worn splines on the main shaft prevent the synchronizer sleeves from sliding smoothly, causing grinding noises when shifting into forward or reverse gears.
Technical Specifications
| Part Number | 2094.304.080 |
| Overall Length | 480 mm (estimated) |
| Shaft Diameter (bearing journals) | 40 mm / 45 mm (estimated) |
| Spline Count | 16 involute splines (estimated) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 3.8 kg (estimated) |
| OEM Reference | ZF 2094.304.080 |
Compatibility
This main shaft is designed for the ZF WG100, WG130, and WG131 transmission families. It is also compatible with the WG180 and WG200 series when used with the correct bearing set and HOUSING configuration. The part fits both on-highway truck applications and off-highway equipment where these ZF gearboxes are installed. Always verify the housing bore dimensions and the COVER alignment before installation to ensure proper end-play clearance.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101012 | TRANSMISSION HOUSING | Encloses the main shaft and gear train; provides bearing support |
| 2094301036 | HOUSING | Intermediate housing section for auxiliary gear sets |
| 2094298057 | HOUSING | Rear housing adapter for output flange mounting |
| 2094301071 | COVER | Seals the rear housing and retains the output bearing |
| 0750111371 | SHAFT SEAL | Prevents oil leakage at the main shaft output end |
| 0634303085 | O-RING | Seals the housing joint to prevent external contamination |
| 2094301030 | GASKET | Provides a leak-proof seal between housing sections |
| 0631306670 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0636011356 | HEXAGON SCREW | Fastens the housing and cover components |
| 4475280060 | SCREW PLUG | Seals oil passages within the housing |
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