Overview
The ZF 4651.006.015 6 WG 100(500) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As the core power transfer module in the WG 100 Series, it converts engine torque into controlled, multi-speed output for loaders, graders, and industrial vehicles. The SKU 4651.006.015 is a direct replacement for worn or failed assemblies, ensuring minimal downtime. It works in concert with the TRANSMISSION HOUSING (4651101007) and the HOUSING (4651301029) to create a sealed, pressurized oil environment for reliable shifting.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, you may experience a noticeable lag between selecting a gear and actual engagement, often accompanied by a jarring clunk. This is a common sign of worn clutch discs or degraded seals inside the unit.
- Intermittent gear slipping under load: If the transmission loses power during uphill travel or heavy digging, the internal clutches are likely failing. This symptom often worsens as hydraulic pressure drops due to internal leakage.
- External oil leaks near the bell housing: A failing assembly can cause fluid to weep from the mating surfaces, particularly where the unit joins the O-RING (0634303928) or the HOUSING (4651301024). Look for drips after extended operation.
- Unusual whining or grinding noises: Worn bearings or damaged planetary gears produce a high-pitched whine or metallic grinding, especially in neutral or low range. This indicates imminent mechanical failure requiring immediate replacement.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4651.006.015 |
| Assembly Type | 6-Speed Powershift (WG 100 Series) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Primary Material | Cast Iron Housing / Steel Gears |
| Max Input Torque | 500 Nm (369 lb-ft) |
| Hydraulic Pressure Range | 12–18 bar |
Compatibility
This complete assembly is engineered for the ZF WG 100 series of powershift transmissions. It is a direct fit for models including the WG 100, WG 120, and WG 150 variants used in compact to mid-size wheel loaders and telehandlers. While primarily designed for the 6-speed configuration, it can also be adapted to certain 4-speed WG 100 housings with the correct valve body. Always verify your transmission serial number against the 4651.006.015 specification before installation. For larger frames such as WG 180 or WG 200, consult the separate WG 200 series assembly listings.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural case for gear train |
| 4651301029 | HOUSING | Rear cover and oil sump section |
| 0634303928 | O-RING | Seals housing joint against leaks |
| 4651301024 | HOUSING | Intermediate clutch housing adapter |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4651303005 | SCREEN SHEET | Secondary oil strainer element |
| 0636101032 | CAP SCREW | High-tensile bolt for housing fastening |
| 0630361028 | SEALING CAP | Plugs unused hydraulic ports |
| 4475280060 | SCREW PLUG | Threaded plug for drain/fill holes |
| 0634303312 | O-RING | Seals screw plug against leakage |
