Overview
The ZF 4651.006.023 6 WG 100(500) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the clutch packs, planetary gearsets, and hydraulic control valves into a single, ready-to-install package. As the core power transfer module, it sits directly between the engine flywheel and the driveline, managing torque distribution across six forward speeds. The SKU 4651.006.023 is a direct replacement for original ZF units, ensuring precise fitment and OEM-grade performance in loaders, graders, and material handlers.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs wear, the transmission may hesitate or fail to hold a gear, especially during uphill operation or heavy bucket loading.
- Delayed or harsh shifting between ranges: Worn hydraulic seals or valve body degradation cause pressure drops, leading to jarring shifts or a noticeable lag when moving from forward to reverse.
- External oil leaks near the bell housing or output flange: Degraded O-rings or housing cracks allow transmission fluid to escape, often visible as drips after shutdown. This is a common symptom when the 0634303928: O-RING fails.
- Overheating or burnt fluid odor: Internal friction material shedding from worn clutches generates excessive heat, causing the transmission to run hot and emit a distinct burnt smell.
Technical Specifications
| Parameter | Value |
|---|---|
| Assembly Weight (dry) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 4651.006.023 |
| Max Input Torque | 500 Nm |
| Fluid Capacity | 12.5 liters |
Compatibility
This complete unit is engineered for the ZF WG 100 series, specifically the 6 WG 100(500) variant. It is also compatible with the WG 180 and WG 200 series transmissions when used with the appropriate 4651101007: TRANSMISSION HOUSING adapter. For installations requiring a different bell housing pattern, the 4651301029: HOUSING and 4651301024: HOUSING components can be swapped to match various OEM driveline configurations. Always verify the transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4651301029 | HOUSING | Rear output housing for driveline connection |
| 0634303928 | O-RING | Seals fluid passages between housing sections |
| 4651301024 | HOUSING | Front bell housing adapter for engine mounting |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic circuit protection |
| 4651303005 | SCREEN SHEET | Secondary filter screen for oil return line |
| 0636101032 | CAP SCREW | M12 fastener for housing-to-housing joint |
| 0630361028 | SEALING CAP | Plugs unused hydraulic ports during assembly |
| 4475280060 | SCREW PLUG | Threaded plug for drain or test ports |
| 0634303312 | O-RING | Seals cap screw and plug interfaces |
