ZF 4660.013.004 WG 98 TC Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4660.013.004 WG 98 TC Powershift Transmission Assembly represents a complete, drop-in replacement unit engineered for heavy-duty industrial applications. This fully assembled transmission integrates the torque converter and gear system into a single, pre-tested module, eliminating the need for piecemeal component assembly. The SKU 4660.013.004 is specifically designed to fit within the WG 98 Series housing architecture, serving as the central power transfer unit that modulates engine torque to the driveline. When installed, this assembly works in concert with the TRANSMISSION HOUSING to ensure precise alignment of internal gears and shafts, while the HOUSING II provides critical support for the rear bearing cluster. The unit also includes a factory-fitted CYLINDRICAL PIN for dowel alignment and a TYPE PLATE for OEM identification.

Symptoms of Failure

• Erratic gear engagement under load: When the WG 98 TC assembly begins to fail, operators often report delayed or harsh shifting, particularly when moving from neutral to forward or reverse. This symptom frequently points to internal clutch pack wear or torque converter stator failure.
• Hydraulic fluid contamination with metallic debris: A common failure mode involves the breakdown of internal bearings or planetary gears, which introduces fine metal particles into the transmission fluid. This can be detected during routine oil changes and often accompanies a whining noise from the transmission housing.
• Torque converter shudder at low RPM: A noticeable vibration or shudder during initial acceleration, especially in construction equipment, indicates that the torque converter lock-up clutch or damper assembly within the 4660.013.004 unit is compromised.
• External oil seepage from the bell housing: Worn seals or gaskets around the input shaft area can cause oil to leak from the joint between the transmission and engine, often mistaken for engine oil leaks. This is a key indicator that the complete assembly requires replacement.

Technical Specifications

Compatibility

This ZF 4660.013.004 assembly is primarily designed for the WG 98 Series transmission family, which includes models such as the WG180, WG200, and WG210. It is also backward-compatible with certain WG 80 Series variants when used with the appropriate adapter kit. The unit is commonly found in ZF’s ERGOPOWER and ECOMID drivelines used in wheel loaders, telehandlers, and industrial tractors. For proper installation, ensure that the TRANSMISSION HOUSING and HOUSING II are inspected for wear, as these components directly interface with the assembly’s mounting points.

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