Overview
The ZF 4660.013.013 WG 98 TC Powershift Transmission Assembly is a complete, ready-to-install unit designed for heavy-duty industrial and construction machinery. As a core component of the WG 98 Series, this assembly integrates the torque converter, planetary gear sets, and hydraulic control system into a single, robust package. The SKU 4660.013.013 serves as the direct replacement for original equipment in ZF powershift transmissions, ensuring seamless power delivery and clutch modulation under high-load conditions. This assembly sits at the heart of the drivetrain, converting engine torque into controlled wheel or track motion, and is engineered to withstand extreme thermal and mechanical stress in applications such as wheel loaders, forklifts, and material handlers.
Symptoms of Failure
- Delayed or harsh engagement when shifting gears: Worn clutch packs or valve body issues within the 4660.013.013 assembly cause hesitation or abrupt engagement, often accompanied by a noticeable “clunk” during direction changes.
- Torque converter shudder at low speeds: Internal wear leads to vibration or shuddering when the machine is under load at low RPM, indicating degraded stator or turbine components inside the WG 98 TC unit.
- Hydraulic oil contamination with metallic debris: As internal friction materials break down, metal particles appear in the transmission fluid, often visible during routine oil changes or filter inspections.
- Loss of power under load or transmission overheating: Slipping clutches or a failing torque converter cause the transmission to run hot, with the oil temperature gauge rising rapidly during normal operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4660.013.013 |
| Series | WG 98 (WG 98 TC) |
| Type | Powershift Transmission Assembly (Complete Unit) |
| Weight (approx.) | 185 kg (408 lbs) |
| Housing Material | Cast Iron / Aluminum Alloy |
| OEM Reference | ZF 4660 013 013 |
| Torque Converter Type | Single-stage, 3-element |
| Max Input Torque (est.) | 980 Nm (723 lb-ft) |
| Fluid Capacity (est.) | 18-22 liters (4.8-5.8 gallons) |
Compatibility
This complete unit is specifically engineered for the ZF WG 98 Series of powershift transmissions. It is a direct fit for models including the WG 98 TC, WG 180, and WG 200 variants commonly used in telehandlers, wheel loaders, and industrial tractors. The assembly also integrates with earlier WG 98 iterations and is backward-compatible with certain WG 100 series housings when paired with the correct 4660101020: TRANSMISSION HOUSING. For proper sealing and alignment, the 4660301056: HOUSING II must be installed to secure the rear cover. Additionally, the 0631306174: CYLINDRICAL PIN is required for precise dowel alignment during assembly, while the 0769123894: TYPE PLATE provides essential identification for service history.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4660301056 | HOUSING II | Rear housing cover for torque converter section |
| 0631306174 | CYLINDRICAL PIN | Dowel pin for precise housing alignment |
| 0769123894 | TYPE PLATE | Identification plate with serial number |
| 0750100022 | SCREW PLUG | Seals oil passages and drain ports |
| 4660221031 | SUCTION TUBE | Oil pickup tube for hydraulic pump |
| 0634100317 | O-RING | Seals suction tube connection |
| 0636103273 | CAP SCREW | Fastener for housing and cover plates |
| 0634306311 | O-RING | Seals cap screw and hydraulic ports |
| 4660321029 | FIXING PLATE | Retains clutch pack and valve body |
