Overview
The ZF 4651.006.004 6 WG 100(500) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. As the core drivetrain component of the WG 100 Series, this assembly integrates the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. The SKU 4651.006.004 specifically denotes the 6-speed, 100(500) Nm variant, engineered to deliver seamless power shifts under extreme load conditions. This unit replaces worn or failed transmissions in wheel loaders, telehandlers, and industrial tractors, restoring original equipment performance without the need for piecemeal repairs.
Symptoms of Failure
When the ZF 4651.006.004 assembly begins to degrade, operators typically notice these distinct failure modes:
- Harsh or delayed engagement: A pronounced clunk or lag when shifting from neutral to forward or reverse, indicating worn clutch packs or hydraulic pressure loss within the unit.
- Transmission fluid overheating: Persistent high-temperature warnings despite normal coolant levels, often caused by internal seal failure or torque converter stator wear.
- Intermittent gear slipping under load: The engine revs but machine speed drops during digging or climbing, pointing to fatigued friction discs or a failing output shaft bearing.
- External oil seepage at the bell housing: Visible drips or wetness around the pump drive area, typically from degraded input shaft seals or a cracked housing.
Technical Specifications
| Parameter | Value |
|---|---|
| Overall Length (mm) | 785 |
| Dry Weight (kg) | 285 |
| Input Torque Capacity (Nm) | 500 |
| Number of Forward Speeds | 6 |
| Housing Material | High-strength aluminum alloy |
| OEM Reference | ZF 4651.006.004 |
| Fluid Capacity (liters) | 22 |
Compatibility
This complete unit is engineered for the ZF WG 100 Series transmission family. While the 4651.006.004 is specific to the 6-speed, 100(500) Nm configuration, it shares mounting patterns and hydraulic interfaces with the following ZF models:
- WG 100 (all sub-variants: 100(300), 100(400), 100(500))
- WG 120 (limited compatibility; verify bell housing bolt pattern)
- WG 150 (requires adapter plate for torque converter fitment)
- WG 180 (not direct fit; different output flange dimensions)
Important: This assembly is not backward-compatible with WG 200 or WG 250 series transmissions without significant modification. Always cross-reference your machine’s serial number with the ZF parts catalog before ordering.
