Overview
This genuine ZF 4651.006.008 6 WG 100(500) Powershift Transmission Assembly represents a complete, ready-to-install unit engineered for heavy-duty industrial drivelines. As the core hydraulic-mechanical assembly within the WG 100 Series, this component integrates the torque converter, planetary gear sets, and clutch packs into a single sealed housing. Designed for high-torque applications in construction, mining, and material handling equipment, the assembly ensures precise power modulation and smooth directional shifts under load. The SKU 4651.006.008 specifically identifies this as a 6-speed configuration with a 500-series torque converter interface, making it a direct replacement for worn or failed original units.
Symptoms of Failure
When this ZF 4651.006.008 assembly begins to degrade, operators typically notice these specific failure indicators:
- Delayed or harsh engagement — A pronounced lag when shifting from neutral to forward or reverse, often accompanied by a jarring clunk. This points to worn clutch pack seals or degraded hydraulic pressure within the unit.
- Transmission fluid overheating — Persistent high-temperature warnings on the dashboard, even under moderate loads. Internal leakage past the torque converter stator or worn bearings generates excess heat that the cooler cannot dissipate.
- Oil leaks at the bell housing or PTO ports — Visible drips or wet spots around the input shaft seal or power take-off interfaces. This indicates hardened elastomers or scored sealing surfaces inside the assembly.
- Intermittent gear slipping under load — The engine revs freely without proportional vehicle movement, particularly when climbing grades or pushing heavy loads. This suggests worn clutch friction discs or a failing torque converter lock-up clutch.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Complete Powershift Transmission Assembly |
| ZF Part Number | 4651.006.008 |
| Series | WG 100 (500) |
| Number of Speeds | 6 Forward / 1 Reverse |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Overall Length | 720 mm |
| Bell Housing Diameter | 410 mm (SAE 3 pattern) |
| Input Torque Capacity | 500 Nm (peak) |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4651.006.008 (OEM direct) |
Compatibility
This ZF 4651.006.008 assembly is purpose-built for the WG 100 Series transmission family. While the WG 100 is a distinct platform, its internal architecture shares hydraulic and mechanical principles with larger ZF powershift models. Based on the part type and torque rating, this unit is directly compatible with:
- ZF WG 100 (500) — Primary application; direct bolt-in replacement for all 6-speed variants.
- ZF WG 120 — Limited compatibility; requires verification of bell housing pattern and PTO configuration.
- ZF WG 150 — Not directly compatible without adapter plates; torque converter stall speed differs.
- ZF WG 180 / WG 200 — These larger series use a different input shaft spline count and housing bolt pattern; this assembly will not physically mount.
Always cross-reference the original equipment manufacturer (OEM) tag against the 4651.006.008 number before installation. For non-WG 100 applications, consult a ZF service manual for adapter kit requirements.
