Overview
The ZF 4660.013.016 4 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 (TC) with the four-speed powershift gearbox, serving as the primary power transfer module between the engine and driveline. The SKU 4660.013.016 is a direct replacement for worn or failed assemblies in the WG 98 Series, ensuring seamless integration with existing mounting points and hydraulic circuits. This unit is typically positioned between the engine flywheel housing and the final drive, managing torque multiplication and gear selection under extreme loads.
Symptoms of Failure
- Delayed or harsh engagement: When the transmission hesitates before shifting into forward or reverse, or slams into gear, the internal clutch packs or torque converter stator may be failing. This symptom often accompanies the SKU 4660.013.016 unit nearing the end of its service life.
- Oil leaks at the housing seam: Visible fluid weeping from the joint between the TRANSMISSION HOUSING and HOUSING II indicates seal degradation. Left unchecked, low fluid levels cause gear slipping and overheating.
- Torque converter shudder under load: A vibration or shudder during acceleration, especially at low speeds, points to worn turbine or stator internals within the 4 WG 98 TC assembly.
- Intermittent loss of drive: The machine may suddenly lose forward or reverse motion, then resume after a cooldown period. This is often linked to internal valve body wear or a failing CYLINDRICAL PIN that controls shift timing.
Technical Specifications
| Parameter | Value |
|---|---|
| Assembly Type | 4 WG 98 TC Powershift with Torque Converter |
| ZF Part Number | 4660.013.016 |
| OEM Reference | ZF WG 98 Series |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Housing Material | High-strength cast iron (GGG-40) |
| Torque Converter Diameter | 380 mm |
| Number of Speeds | 4 forward / 4 reverse |
| Max Input Torque | 1,200 Nm (885 lb-ft) |
| Mounting Interface | SAE 3 with 10-bolt pattern |
Compatibility
This complete unit is engineered for the ZF WG 98 Series, specifically the 4 WG 98 TC variant. It is compatible with WG180, WG200, and WG210 transmission models that share the same bellhousing pattern and torque converter pilot diameter. The assembly also fits select WG 98 non-TC models when retrofitting with a torque converter upgrade. Always verify the TYPE PLATE on your existing unit to confirm the exact series designation before ordering the 4660.013.016.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301056 | HOUSING II | Rear section housing output shaft bearings |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0769123894 | TYPE PLATE | Identification plate with serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports |
| 4660221031 | SUCTION TUBE | Oil pickup from sump to pump |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastens housing halves together |
| 0634306311 | O-RING | Seals cap screw bore |
| 4660321029 | FIXING PLATE | Locks torque converter to flex plate |
