Overview
This is the complete ZF 4651.006.002 6 WG 100(500) Powershift Transmission Assembly, a fully integrated drop-in unit designed for heavy-duty industrial drivelines. As the core power transfer module in the WG 100 series, this assembly houses the hydraulic control system, planetary gear sets, and clutch packs required for seamless, load-shifting operation. The SKU 4651.006.002 denotes a complete, factory-spec assembly, eliminating the need for partial rebuilds. It directly replaces worn or failed transmissions in mobile equipment such as forklifts, telehandlers, and airport ground support vehicles, restoring full torque capacity and shift precision.
Symptoms of Failure
When this ZF 4651.006.002 assembly begins to degrade, operators will notice distinct performance issues. Watch for these specific failure symptoms:
- Delayed or harsh engagement when shifting from neutral to forward/reverse: This indicates internal hydraulic pressure loss or worn clutch discs within the assembly.
- Persistent transmission fluid leaks around the bell housing or output shaft seal: A common sign of degraded gaskets or seal wear in the 6 WG 100(500) unit, often leading to low fluid levels.
- Gear slipping under moderate to heavy load: The transmission may momentarily lose drive power, especially during incline operation, pointing to worn friction plates or a failing torque converter lock-up.
- Unusual whining or grinding noises from the transmission housing: This suggests bearing fatigue or gear tooth damage inside the complete assembly, requiring immediate replacement.
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Complete Powershift Transmission Assembly |
| Part Number / SKU | 4651.006.002 |
| Series | WG 100 (500) |
| Gear Configuration | 6 Forward / 3 Reverse (Powershift) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 4651.006.002 |
| Fluid Capacity | 12.5 liters (approx.) |
Compatibility
This ZF 4651.006.002 assembly is engineered specifically for the WG 100 Series transmission family. While it is a direct fit for the 6 WG 100(500) variant, it is also mechanically compatible with other models in the WG range that share the same bell housing pattern and input spline count. Estimated compatible ZF transmission models include:
- ZF WG 100 (all sub-variants)
- ZF WG 120 (with adapter plate verification)
- ZF WG 180 (limited to specific output flange configurations)
- ZF WG 200 (requires cross-referencing of hydraulic valve body)
Important: Always verify the output flange, PTO drive, and shift control interface against your existing unit before installation. This assembly is not backward-compatible with older 4-speed WG series without significant modifications.
