ZF 4661.002.011 4 WG 90 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4661.002.011 4 WG 90 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the full gear train, clutch packs, and hydraulic control system within a single, ready-to-install package. As a core component of the WG 90 series, it manages torque distribution across four forward and reverse speeds, enabling smooth directional shifts under load. The SKU 4661.002.011 replaces worn or failed assemblies, restoring original performance in wheel loaders, graders, and industrial tractors. For optimal sealing and control, this unit is typically paired with the 4661198001 PERIPHERALS kit and the 0501216064 RANGE SELECTOR valve, which govern clutch engagement timing.

Symptoms of Failure

• Delayed or harsh engagement – When the assembly wears, you may experience a noticeable lag between shifting and gear engagement, often accompanied by a jarring clunk. This indicates internal clutch pack wear or hydraulic pressure loss.
• Oil leaks around the housing – External seepage from the main case or output shaft seal points to degraded gaskets or a cracked 4661101032 TRANSMISSION HOUSING. Left unchecked, low fluid levels accelerate internal damage.
• Intermittent gear slipping under load – The transmission may momentarily lose torque during uphill travel or heavy digging, causing the engine to rev without proportional wheel speed. This is a classic sign of worn friction discs or a failing 4661301047 HOUSING II that houses the planetary set.
• Unusual whining or grinding noises – Metallic sounds from the bell housing or sump area suggest bearing fatigue or gear tooth damage, often requiring immediate replacement of the complete assembly.

Technical Specifications

Compatibility

This complete assembly is engineered for the ZF WG 90 series powershift transmissions. It directly fits models including the WG 90, WG 100, WG 120, and WG 150, which are commonly found in compact and mid-size wheel loaders (e.g., Liebherr L506, L508), telescopic handlers, and backhoe loaders. The unit also cross-references to certain WG 180 and WG 200 variants when used with the appropriate 0501216064 RANGE SELECTOR and 4661198001 PERIPHERALS kit. Always verify the bell housing pattern and input shaft spline count against your existing unit before installation.

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