ZF 4651.033.009 3 WG 100(300) Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4651.033.009 3 WG 100(300) Powershift Transmission Assembly | Complete Unit is a fully assembled drop-in replacement for heavy-duty off-highway vehicles. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control system into a single, pre-tested assembly. As the core power transfer module in the WG 100 series, it converts engine torque into controlled wheel or driveline motion. The SKU 4651.033.009 is engineered to match OEM specifications, ensuring direct fitment without modifications. When installed, it works in tandem with the TRANSMISSION HOUSING to provide structural integrity and oil containment.

Symptoms of Failure

• Delayed or harsh shifting under load: Worn clutch discs or piston seals cause hesitation when engaging forward or reverse gears, especially on inclines.
• Internal oil leaks and low pressure: Degraded O-rings or housing cracks lead to visible drips from the bell housing or cooler lines, triggering transmission overheating.
• Gear slipping during power take-off (PTO) operation: The unit fails to hold torque, resulting in RPM flare without corresponding vehicle movement.
• Unusual whining or grinding noises: Bearing wear within the assembly produces metallic sounds that intensify with speed changes.

Technical Specifications

Compatibility

This complete unit is designed for the ZF WG 100 series powershift transmissions, including models WG 100, WG 100/300, and WG 100/400. It is also compatible with select WG 180 and WG 200 variants that share the same bell housing bolt pattern and input shaft spline count. For proper sealing, always replace the O-RING between the unit and the HOUSING. Additionally, the HOUSING must be inspected for cracks before installation. This assembly is commonly used in ZF 3WG-100 and 3WG-300 off-highway transmissions found in forklifts, wheel loaders, and telehandlers.

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