Overview
The ZF 4651.003.019 3 WG 100(500) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly serves as the core power transfer module within the WG 100 Series, integrating the clutch pack, planetary gear sets, and hydraulic control elements into a single, ready-to-install package. The SKU 4651.003.019 replaces worn or failed assemblies to restore full torque capacity and shift quality in ZF powershift transmissions. It mounts directly between the engine bellhousing and the output driveline, requiring precise alignment with the TRANSMISSION HOUSING and the HOUSING to ensure leak-free operation.
Symptoms of Failure
- Delayed or harsh engagement when shifting from neutral to forward — Worn internal seals cause pressure loss, leading to a noticeable lag or clunk during gear changes.
- Persistent oil leaks around the transmission housing interface — Degraded O-RING seals allow hydraulic fluid to escape, often visible as drips beneath the bellhousing area.
- Intermittent gear slipping under load — Friction disc wear reduces clamping force, causing the transmission to momentarily lose drive power when climbing grades or carrying heavy loads.
- Abnormal whining or grinding noises from the transmission center section — Bearing or planetary gear damage within the assembly generates metallic sounds that worsen with RPM.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.003.019 |
| Assembly Type | Complete Powershift Unit (3 WG 100/500) |
| Dry Weight (approx.) | 68 kg (150 lbs) |
| Overall Length | 420 mm |
| Overall Diameter | 310 mm |
| Primary Material | Cast Iron Housing / Steel Gears |
| OEM Reference | ZF 4651.003.019 |
| Seal Type | Viton O-Ring (0634303928 compatible) |
Compatibility
This assembly is engineered for the ZF WG 100 Series, specifically the 3 WG 100(500) variant. It is also compatible with the WG 180 and WG 200 series when used with the correct HOUSING adapter. The unit fits ZF powershift transmissions found in agricultural tractors, wheel loaders, and industrial forklifts from manufacturers such as Case IH, New Holland, and JCB. Always verify the housing configuration before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Encloses the gear train and supports bearing alignment |
| 4651301029 | HOUSING | Rear cover housing for output shaft support |
| 0634303928 | O-RING | Seals the housing-to-assembly joint against fluid leaks |
| 4651301024 | HOUSING | Intermediate housing adapter for WG 180/200 compatibility |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic oil before it enters the pump |
| 4651303005 | SCREEN SHEET | Secondary filtration screen for the clutch lubrication circuit |
| 0636101032 | CAP SCREW | Secures the housing halves together with precise torque |
| 0630361028 | SEALING CAP | Protects unused hydraulic ports from contamination |
| 4475280060 | SCREW PLUG | Closes oil drain and test ports in the housing |
| 0634303312 | O-RING | Seals the screw plug and cap screw interfaces |
