Overview
The ZF 4660.013.015 WG 98 TC Powershift Transmission Assembly is a complete, drop-in replacement unit engineered for heavy-duty off-highway applications. This fully assembled transmission integrates the torque converter and all internal clutches, shafts, and valve bodies into a single, pre-tested package. The SKU 4660.013.015 is specifically designed for the WG 98 series, serving as the primary power transfer module between the engine and driveline. It sits directly behind the engine flywheel housing and connects to the final drive via the output yoke. For structural integrity, this assembly mounts securely to the TRANSMISSION HOUSING and the HOUSING II, ensuring precise alignment under extreme loads.
Symptoms of Failure
- Delayed or harsh engagement when shifting from neutral to forward/reverse: Worn clutch packs or a failing torque converter stator within the 4660.013.015 assembly cause sluggish response and jarring shifts, often accompanied by a loud clunk.
- Transmission overheating under moderate load: Internal seal degradation or a slipping torque converter lock-up clutch generates excessive heat, leading to fluid discoloration and a burnt odor.
- Intermittent loss of power or gear slipping during uphill operation: Hydraulic pressure drops due to worn valve body components or a damaged pump drive gear result in the transmission unexpectedly dropping out of gear.
- External oil leaks at the bell housing or output shaft seal area: Cracks in the main case or worn O-rings allow ATF to weep, leaving visible puddles under the vehicle after shutdown.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.013.015 |
| Series | WG 98 TC (Torque Converter) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length (input to output flange) | 620 mm |
| Maximum Input Torque | 1,200 Nm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4660.013.015 |
| Fluid Capacity (assembly) | 18.5 liters |
| Bolt Torque (housing-to-engine) | 120 Nm |
Compatibility
This complete unit is purpose-built for the ZF WG 98 series powershift transmissions. It is directly compatible with the WG 98, WG 98 TC, and WG 98-2 models commonly found in telescopic handlers, wheel loaders, and industrial forklifts from manufacturers such as Manitou, JCB, and Linde. The assembly also fits select WG 180 and WG 200 variants when used with the appropriate adapter plate. For proper installation, ensure the CYLINDRICAL PIN is correctly aligned during mating to the engine bell housing, and verify the TYPE PLATE matches your original unit’s serial number range for warranty validation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets and valve body |
| 4660301056 | HOUSING II | Rear section housing output shaft and parking brake assembly |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-engine mating |
| 0769123894 | TYPE PLATE | Identification plate with serial number and model code |
| 0750100022 | SCREW PLUG | Seals fluid drain and fill ports in the housing |
| 4660221031 | SUCTION TUBE | Draws ATF from the pan to the pump inlet |
| 0634100317 | O-RING | Seals suction tube connection to pump housing |
| 0636103273 | CAP SCREW | High-tensile bolt for securing housing halves |
| 0634306311 | O-RING | Seals cap screw bore to prevent external leaks |
| 4660321029 | FIXING PLATE | Locks output yoke nut to prevent loosening |
