Overview
The ZF 4660.013.011 WG 98 TC Powershift Transmission Assembly represents a complete, drop-in replacement unit engineered for demanding off-highway applications. This fully assembled transmission integrates the torque converter and all internal gear sets into a single, pre-tested package. The SKU 4660.013.011 is the core rotating assembly within the WG 98 series, responsible for transferring engine torque to the driveline through multiple hydraulic clutch packs. It sits directly between the engine flywheel housing and the output flange, serving as the central power distribution module. For proper sealing and structural integrity, this assembly must be mounted within a compatible TRANSMISSION HOUSING and mated to a HOUSING II to enclose the clutch packs.
Symptoms of Failure
- Delayed or harsh engagement when shifting between forward and reverse: Worn clutch discs or degraded seals inside the 4660.013.011 assembly cause hydraulic pressure loss, resulting in a noticeable lag or a jarring shift. This is a common complaint in ZF WG 98 transmissions operating under heavy load cycles.
- Torque converter shudder during low-speed maneuvering: Internal wear of the stator or turbine components within this complete unit produces a vibration or shudder, particularly when creeping in construction or material handling equipment.
- Chronic transmission overheating with no external leaks: A failing 4660.013.011 assembly often generates excessive heat due to internal slippage. The oil may appear dark or burnt, even if the external CYLINDRICAL PIN and housing seals remain intact.
- Intermittent loss of drive in specific gear ranges: When the planetary gear sets or clutch packs within this assembly wear unevenly, the transmission may suddenly lose power in one or more gears, requiring immediate replacement of the complete unit.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4660.013.011 |
| Assembly Type | WG 98 TC Powershift (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-Grade Aluminum Alloy |
| Torque Converter Diameter | 380 mm |
| OEM Reference | ZF 4660.013.011 |
| Bolt Torque (Housing) | 85 Nm (63 ft-lbs) |
| Fluid Capacity (unit only) | 12.5 L |
Compatibility
This complete transmission assembly is specifically designed for the ZF WG 98 series, which includes the WG180, WG200, and WG210 models commonly found in telescopic handlers, wheel loaders, and industrial tractors. The 4660.013.011 unit is a direct replacement for earlier WG 98 variants and is compatible with both SAE 3 and SAE 4 bellhousing patterns. It integrates seamlessly with the TYPE PLATE for identification and requires the use of a CYLINDRICAL PIN for precise alignment during installation. Do not attempt to use this assembly in WG 120 or WG 150 series transmissions without verifying housing dimensions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Encloses and supports the main gear train |
| 4660301056 | HOUSING II | Rear housing covering clutch pack area |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification and rating plate |
| 0750100022 | SCREW PLUG | Seals fluid passages in the housing |
| 4660221031 | SUCTION TUBE | Oil pick-up tube for pump inlet |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastener for housing assembly |
| 0634306311 | O-RING | Seals cap screw bore |
| 4660321029 | FIXING PLATE | Locks clutch pack retaining nuts |
