Overview
The ZF 4660.013.022 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, ready-to-install package, serving as the core power transfer module in ZF’s WG 98 series. The SKU 4660.013.022 replaces worn or failed assemblies to restore full hydraulic clutch engagement and forward/reverse shuttle operation. It mounts directly between the engine flywheel housing and the final drive, with the 4660101019: TRANSMISSION HOUSING providing the structural envelope for the internal planetary sets.
Symptoms of Failure
- Delayed or harsh gear engagement: When the WG 98 TC assembly loses internal seal integrity, operators experience a noticeable lag when shifting from neutral to forward or reverse, often accompanied by a jarring clunk.
- Torque converter shudder under load: A vibration or shudder during low-speed, high-torque maneuvers indicates worn stator bearings or damaged clutch plates within the assembly.
- External oil leaks at the bell housing: Deteriorated gaskets and seals in the 4660.013.022 unit allow transmission fluid to weep from the joint between the engine and transmission, leaving puddles after shutdown.
- Intermittent power loss during uphill operation: Internal pressure drops cause the clutches to slip, resulting in a sudden loss of tractive effort on inclines without any warning lights.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.013.022 |
| Assembly Type | WG 98 TC Powershift (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| Torque Converter Diameter | 340 mm |
| OEM Reference | ZF 4660.013.022 |
| Bolt Torque Spec (housing) | 120 Nm (class 10.9) |
Compatibility
This complete unit is engineered for the ZF WG 98 series of powershift transmissions. It is a direct fit for the WG 180, WG 200, and WG 211 models commonly found in telescopic handlers, wheel loaders, and rough-terrain forklifts. The assembly also supports the WG 150 variant when used with the correct 4660301056: HOUSING II adapter. For proper alignment during installation, always replace the 0631306174: CYLINDRICAL PIN and affix a new 0769123894: TYPE PLATE for traceability.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101019 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4660301056 | HOUSING II | Rear adapter housing for PTO mounting |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification plate with serial number |
| 0750100022 | SCREW PLUG | Seals oil drain/fill ports |
| 4660221031 | SUCTION TUBE | Oil pickup from pan 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 bolts |
