Overview
The ZF 4660.013.012 WG 98 TC Powershift Transmission Assembly represents a complete, ready-to-install unit engineered for demanding industrial drivetrains. This fully assembled component integrates the torque converter and gear cluster within a single housing, serving as the core power transfer module in ZF’s WG 98 series. The SKU 4660.013.012 is specifically designed to replace worn or failed assemblies, restoring original equipment performance in wheel loaders, forklifts, and heavy construction vehicles. When paired with a robust TRANSMISSION HOUSING, this unit ensures precise alignment of planetary gears and clutch packs, minimizing energy loss during high-torque operations.
Symptoms of Failure
- Erratic gear engagement or slipping under load: A failing WG 98 TC assembly often causes delayed shifts or complete loss of drive in forward gears, particularly when the transmission is hot.
- Torque converter shudder during acceleration: Worn internal clutches or a damaged stator produce a distinct vibration or “shudder” at low speeds, indicating imminent assembly failure.
- External oil leaks near the bell housing: Degraded seals within the 4660.013.012 unit allow transmission fluid to escape, often pooling beneath the vehicle after extended operation.
- Metallic grinding noises from the transmission pan: Debris from failing bearings or gear teeth contaminates the oil, causing audible grinding during gear changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.013.012 |
| Assembly Type | WG 98 TC Powershift (Complete Unit) |
| Dry Weight (approx.) | 145 kg (320 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-Grade Cast Iron |
| Torque Converter Diameter | 340 mm |
| OEM Reference | ZF 4660.013.012 |
| Bolt Torque Spec (Housing) | 120 Nm (88 lb-ft) |
Compatibility
This complete unit is engineered for ZF WG 98 series powershift transmissions, including models such as the WG180, WG200, and WG211. It directly replaces the original assembly in vehicles like the ZL50 wheel loader and various telescopic handlers. The 4660.013.012 assembly interfaces with the HOUSING II to secure the valve body and oil channels. For proper installation, technicians must also replace the CYLINDRICAL PIN that aligns the assembly to the engine flywheel housing. After installation, affix the new TYPE PLATE to the housing for accurate future identification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4660301056 | HOUSING II | Secondary housing for valve body |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for assembly |
| 0769123894 | TYPE PLATE | Identification and rating plate |
| 0750100022 | SCREW PLUG | Seals oil drain and fill ports |
| 4660221031 | SUCTION TUBE | Oil pickup from pan to pump |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastens housing sections |
| 0634306311 | O-RING | Seals cap screw passages |
| 4660321029 | FIXING PLATE | Secures torque converter stator |
