Overview
This ZF 4651.003.007 3 WG 100(400) Powershift Transmission Assembly is a complete, factory-grade unit designed for heavy-duty off-highway machinery. As a core component of the WG 100 series, this assembly integrates the torque converter, planetary gear sets, and hydraulic clutch packs into a single, ready-to-install package. The SKU 4651.003.007 specifically denotes the 3-speed configuration with a 400-series torque converter, engineered for precise power modulation in wheel loaders, forklifts, and industrial tractors. It replaces worn-out internal modules to restore full driveline efficiency and eliminate parasitic power loss.
Symptoms of Failure
When the ZF 4651.003.007 assembly begins to degrade, operators will notice distinct performance issues. Watch for these specific failure indicators:
- Delayed engagement or “slipping” in forward gears: The transmission hesitates before moving, or the engine revs without proportional acceleration, indicating worn clutch packs or hydraulic seal failure.
- External oil leaks near the bell housing or output shaft: Visible fluid drips or wet spots around the transmission casing, often caused by degraded O-rings or cracked housing on the 3 WG 100(400) unit.
- Erratic shifting under load: The transmission hunts between gears or produces a grinding noise during direction changes, pointing to damaged planetary gears or a failing torque converter stator.
- Overheating transmission fluid: Persistent high-temperature warnings despite normal fluid levels, typically from internal wear that generates excessive friction within the assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4651.003.007 |
| Assembly Type | 3 WG 100(400) Powershift Transmission |
| Gear Configuration | 3-Speed Forward / 3-Speed Reverse |
| Torque Converter Size | 400 mm (15.75 in) diameter |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm (24.4 in) |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4651.003.007 / 3 WG 100 |
| Max Input Torque | 1,200 Nm (885 lb-ft) |
Compatibility
This ZF 4651.003.007 assembly is specifically engineered for the WG 100 series transmission family. Based on its design and torque capacity, it is directly compatible with the following ZF models:
- ZF WG 100 (all sub-variants, including 3 WG 100)
- ZF WG 120 (with adapter plate verification)
- ZF WG 150 (limited compatibility; check bell housing bolt pattern)
- ZF WG 180 (not recommended without full driveline assessment)
This unit is not designed for WG 200 or larger series transmissions. Always cross-reference your existing transmission tag with the SKU 4651.003.007 before installation.
