Overview
The ZF 4660.013.001 WG 98 TC Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the torque converter and gear cluster into a single, pre-assembled module, ensuring precise hydraulic and mechanical alignment. The SKU 4660.013.001 serves as the direct replacement for the original WG 98 series assembly, eliminating the need for individual component matching. It sits as the core power transfer unit between the engine and the driveline, managing all clutch engagements and gear ratios within the transmission housing.
Symptoms of Failure
- Delayed or harsh engagement when shifting from neutral to forward: A worn assembly often causes a noticeable lag or a jarring “clunk” as the clutches engage, indicating internal seal or piston wear.
- Loss of power under load with high engine RPM: If the torque converter stator or clutch pack is slipping, the engine will rev freely without proportional vehicle movement, a classic sign of internal hydraulic failure.
- Contaminated transmission fluid with metallic debris: Worn bearings or clutch plates within the assembly shed metal particles, which can be found during routine oil changes or filter inspections.
- Erratic shifting or gear hunting on inclines: A failing assembly cannot maintain consistent hydraulic pressure, causing the transmission to slip between gears or refuse to hold a gear under load.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4660.013.001 |
| Series | WG 98 |
| Assembly Type | Powershift with Torque Converter (TC) |
| Estimated Dry Weight | 185 kg (408 lbs) |
| Overall Length (approx.) | 620 mm |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 4660.013.001 |
| Bolt Torque Spec (housing) | 120 Nm (refer to manual) |
Compatibility
This complete assembly is engineered for the ZF WG 98 series transmissions, which are commonly deployed in wheel loaders, telehandlers, and industrial tractors. While the WG 98 is the primary fitment, this unit shares hydraulic and mechanical architecture with the WG 180 and WG 200 series. Always verify the bell housing pattern and torque converter pilot diameter before installation. The assembly mounts directly into the 4660101020: TRANSMISSION HOUSING and is secured by the 4660301056: HOUSING II cover. During rebuild, the 0631306174: CYLINDRICAL PIN must be aligned to index the assembly correctly, and the 0769123894: TYPE PLATE should be transferred to the new unit for identification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4660301056 | HOUSING II | Rear cover and PTO mounting interface |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0769123894 | TYPE PLATE | Identification and serial number plate |
| 0750100022 | SCREW PLUG | Seals oil passages and inspection ports |
| 4660221031 | SUCTION TUBE | Oil pick-up from pan to pump |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastener for housing flanges |
| 0634306311 | O-RING | Seals cap screw and plug interfaces |
| 4660321029 | FIXING PLATE | Locks bearing and shaft positions |
