Overview
This ZF 4651.003.005 3 WG 100(500) Powershift Transmission Assembly is a complete, drop-in replacement unit designed for heavy-duty off-highway applications. As a fully assembled gearbox, it integrates the torque converter, clutch packs, and planetary gear sets into a single, ready-to-install package. The SKU 4651.003.005 specifically denotes a 3-speed configuration with a 100(500) series output flange, engineered for precise power distribution in wheel loaders, forklifts, and industrial tractors. This assembly replaces the need for individual component rebuilds, offering a direct OEM-spec solution for restoring drivetrain integrity.
Symptoms of Failure
When the ZF 4651.003.005 assembly begins to degrade, operators will notice distinct operational issues. Look for these specific failure indicators:
- Delayed engagement or gear slipping under load: A worn clutch pack or valve body within the 3 WG 100(500) causes hesitation when shifting from forward to reverse, or slipping during heavy lifting cycles.
- External oil leaks at the output flange or converter housing: Deteriorated seals on the 4651.003.005 unit lead to visible hydraulic fluid drips, often mistaken for engine oil leaks, reducing system pressure.
- Erratic or harsh shifting: Contaminated hydraulic fluid or a failing torque converter stator produces sudden, jarring gear changes, especially when the transmission reaches operating temperature.
- Overheating with reduced power transfer: Internal wear in the 3 WG 100(500) assembly causes the transmission to run hot, triggering warning lights and a noticeable loss of tractive effort during incline operation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4651.003.005 |
| Assembly Type | Complete Powershift Transmission |
| Configuration | 3-Speed Forward / 3-Speed Reverse |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Output Flange | 100(500) Series |
| Primary Material | High-Grade Cast Iron Housing / Steel Gears |
| OEM Reference | ZF 3 WG 100(500) |
| Hydraulic Fluid Capacity | 12.5 Liters (approx.) |
Compatibility
This 4651.003.005 assembly is specifically engineered for the ZF WG 100 series transmission family. While it is a direct fit for the 3 WG 100(500) variant, it is also mechanically compatible with the following ZF models when using the correct adapter plates or output flanges:
- ZF WG 100 (all sub-variants including 2-speed and 3-speed)
- ZF WG 120 (requires output flange modification)
- ZF WG 150 (limited compatibility with specific torque converter housings)
- ZF WG 180 (not compatible without major driveline alterations)
- ZF WG 200 (incompatible due to larger clutch pack diameter)
Always verify the bellhousing pattern and input spline count against your original unit. This assembly is not designed for the WG 180 or WG 200 series without significant custom fabrication.
