Overview
The ZF 4660.103.004 OUTPUT for WG98 is a critical driveline component engineered to transfer rotational force from the transmission’s planetary gear set to the output flange. Positioned at the rear of the WG 98 series housing, this OEM genuine part ensures precise torque delivery under heavy-duty industrial loads. The SKU 4660.103.004 is manufactured to ZF’s exacting tolerances, featuring hardened steel construction to withstand continuous high-torque applications. This output shaft interfaces directly with the 4660101020: TRANSMISSION HOUSING and the 4660301056: HOUSING II, forming a sealed assembly that maintains oil circulation and gear alignment. When paired with the 0631306174: CYLINDRICAL PIN for precise positioning, this part delivers reliable performance in construction, mining, and marine powertrains.
Symptoms of Failure
- Output flange oil leakage: Worn seals or shaft scoring cause fluid to weep from the rear of the transmission, often visible as drips near the driveline connection.
- Vibration during gear engagement: A failing 4660.103.004 output can produce rhythmic shuddering when shifting between forward and reverse, indicating bearing surface degradation.
- Metallic grinding noise from the tail housing: Advanced wear generates a distinct grinding sound, particularly under load, signaling imminent spline or journal failure.
- Intermittent power loss to the wheels: Slippage at the output interface reduces torque transfer, causing the vehicle to lose speed on inclines or during heavy hauling.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.103.004 |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Overall Length | 312 mm (12.28 in) |
| Shaft Diameter | 65 mm (2.56 in) |
| Spline Count | 21 involute splines |
| Weight | 4.8 kg (10.6 lbs) |
| OEM Reference | ZF 4660.103.004 |
| Seal Surface Hardness | 58–62 HRC |
Compatibility
This output shaft is specifically designed for the ZF WG 98 series, which includes the WG180, WG200, and WG250 models commonly used in off-highway vehicles and industrial equipment. It also fits select WG98 variants in concrete mixers, forklifts, and wheel loaders. For proper installation, ensure the 0769123894: TYPE PLATE is referenced to confirm transmission model and revision level. The 4660.103.004 replaces earlier part numbers 4660.103.001 and 4660.103.002, offering improved spline durability.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Encloses gear sets and supports output shaft bearings |
| 4660301056 | HOUSING II | Rear housing section that aligns output flange |
| 0631306174 | CYLINDRICAL PIN | Locates housing halves during assembly |
| 0769123894 | TYPE PLATE | Identifies transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals oil drain or fill ports in the housing |
| 4660221031 | SUCTION TUBE | Draws oil from sump to pump inlet |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastens housing sections together |
| 0634306311 | O-RING | Seals cap screw threads against oil leakage |
| 4660321029 | FIXING PLATE | Retains output shaft bearing in position |
